e2wm.el

;;; e2wm.el --- simple window manager for emacs  -*- lexical-binding: t; -*- 

;; Copyright (C) 2024 SAKURAI Masashi

;; Author: SAKURAI Masashi <m.sakurai atmark kiwanami.net>
;; Version: 1.5
;; Keywords: tools, window manager
;; Package-Requires: ((window-layout "1.5"))

;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with this program.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This is an demonstration implementation of introducing window management to Emacs.
;; * Management of list of editable buffers
;; * Assignment of windows for pop-up buffers
;; * Switching window layout like the perspective in eclipse
;; * Plug-in extension

;; The current implementation has following perspectives:
;; * code      : main coding layout
;; * two       : side by side layout
;; * doc       : reading documentation layout
;; * dashboard : showing plug-ins like dashboard in Mac OSX
;; * array     : selecting buffers like expose in Mac OSX

;;; Installation:

;; (1) Put e2wm.el and window-layout.el in load-path.
;; (2) Put the following code in your .emacs file,
;;    (require 'e2wm)
;; (3) M-x e2wm:start-management to start e2wm.
;; To stop e2wm, M-x e2wm:stop-management or [C-c ; Q].


;;; Customization

;; * Layout recipe (`e2wm:c-PST-NAME-recipe'):

;; Layout recipe RECIPE (e.g., `e2wm:c-code-recipe') is a recursive
;; tree-like structure defined as follows:

;; (SPLIT-TYPE [SPLIT-OPTION]
;;             WINDOW-or-RECIPE    ; left or upper side
;;             WINDOW-or-RECIPE)   ; right or lower side

;; WINDOW is a name (symbol) of the window. This is used in the
;; `:name' property of the window information list (winfo, see the
;; next section).

;; Split types (SPLIT-TYPE):

;;   - : split vertically
;;   | : split horizontally

;; Split option list SPLIT-OPTION is a plist with the following
;; properties. (the prefix 'left' can be replaced by 'right', 'upper'
;; and 'lower'.):

;;   :left-size        : (column or row number) window size
;;   :left-max-size    : (column or row number) if window size is larger
;;                     : than this value, the window is shrunken.
;;   :left-size-ratio  : (0.0 - 1.0) window size ratio. the size of
;;                     : the other side is the rest.
;;
;; Note:
;; The split option can be omitted.
;; The size parameters, :size, :max-size and :size-ratio, are mutually
;; exclusive.  The size of a window is related with one of the other
;; side window. So, if both side windows set size parameters, the
;; window size may not be adjusted as you write.

;; * Window information  (`e2wm:c-PST-NAME-winfo'):

;; Window information (e.g., `e2wm:c-code-winfo') is a list of window
;; options (plist).  Besides the options defined in window-layout.el,
;; `:name' (mandatory), `:buffer', `:default-hide' and `:fix-size',
;; e2wm has additional options.

;;   :name      [*] : the window name.
;;   :buffer        : A buffer name or a buffer object to show the window.
;;                  : If nil or omitted, the current buffer remains.
;;   :default-hide  : If t, the window is hided initially.
;;                  : (type: t or nil, default: nil)
;;   :fix-size      : If t, when the windows are laid out again, the
;;                  : window size is remained.
;;                  : (type: t or nil, default: nil)
;;   :plugin        : Plug-in name.
;;                  : (type: symbol)
;;   :plugin-args   : Arguments for the plug-in.  See each plug-in
;;                  : documentation for use of this option.
;;                  : (type: any lisp objecct)

;;; Development memo:

;; See readme for further documentation.

;; ** Side effects
;;
;; * advice
;;  - buffer系
;;     switch-to-buffer, pop-to-buffer
;;  - window-configuration系
;;     current-window-configuration
;;     window-configuration-frame
;;     compare-window-configurations
;;     set-window-configuration
;;     window-configuration-p
;; * hook
;;     kill-buffer-hook
;;     window-configuration-change-hook
;;     completion-setup-hook
;;     after-save-hook
;; * override variable
;;     special-display-function

;; ** Local words
;; pst     : Perspective
;; e2wm:c- : Configuration variables
;; e2wm:$  : Structure functions

;; ** Source code layout

;; Configurations  / e2wm:c-
;; Fundamental functions
;; Buffer history management / e2wm:history-
;; Framework for perspectives / e2wm:pst-
;; Framework for perspective set / e2wm:pstset-
;; Advices and hooks (switch-to-buffer, pop-to-buffer and so on)
;; Framework for plug-ins / e2wm:plugin-
;; Menu definition / e2wm:menu-
;; Plug-in definitions / e2wm:def-plugin-
;; Perspective definitions / e2wm:dp-
;;   code  / e2wm:dp-code-
;;   doc   / e2wm:dp-doc-
;;   two   / e2wm:dp-two-
;;   dashboard / e2wm:dp-dashboard-
;;   array / e2wm:dp-array-
;; Start-up and exit e2wm

;;; Code:

(require 'cl-lib)

(require 'imenu)
(require 'easymenu)
(require 'windmove)

(require 'window-layout)

(eval-when-compile (defvar prev-selected-buffer))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; ### Customize
(defvar e2wm:c-max-history-num 20 "Number of buffer history.")
(defvar e2wm:c-recordable-buffer-p
  (lambda (buf)
    (buffer-local-value 'buffer-file-name buf))
  "Return non-nil, if the buffer is an editable buffer.")
(defvar e2wm:c-document-buffer-p ;
  (lambda (buf)
    (string-match "\\*\\(Help\\|info\\|w3m\\|WoMan\\|eww\\)" (buffer-name buf)))
  "Retrun non-nil, if the buffer is a document buffer.")

(defvar e2wm:c-blank-buffer-name " *e2wm:blank*"
  "Blank buffer name.")

(defvar e2wm:prefix-key "C-c ; " "Prefix key")


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; ### Macro / Utilities

(defmacro e2wm:aif (test-form then-form &rest else-forms)
  "Anaphoric IF."
  (declare (debug (form form &rest form)))
  `(let ((it ,test-form))
     (if it ,then-form ,@else-forms)))
(put 'e2wm:aif 'lisp-indent-function 2)

(defmacro e2wm:aand (test &rest rest)
  "Anaphoric AND."
  (declare (debug (form &rest form)))
  `(let ((it ,test))
     (if it ,(if rest (macroexpand-all `(e2wm:aand ,@rest)) 'it))))

(defmacro e2wm:not-minibuffer (&rest body)
  "Evaluate a body form when the minibuffer is not active."
  (declare (debug (&rest form)))
  `(when (= 0 (minibuffer-depth))
     ,@body))

(defmacro e2wm:safe-call (method object &rest args)
  "Safely method calling."
  (let ((sym (gensym)))
    `(let ((,sym (,method ,object)))
       (if ,sym
           (funcall ,sym ,@args)))))

;; for a list of structure

(defun e2wm:find (name name-func seq)
  "Return the element that the return value of the NAME-FUNC
equals to NAME in the given sequence SEQ."
  (cl-loop for i in seq
        if (eq name (funcall name-func i))
        return i))

(defmacro e2wm:delete! (name name-func seq)
  "Destructively delete the element."
  `(setq ,seq
         (cl-delete-if
          (lambda (i) (eq ,name (funcall ',name-func i)))
             ,seq)))

;; debug

(defvar e2wm:debug nil "Debug output switch.") ; (setq e2wm:debug t)
(defvar e2wm:debug-count 0 "[internal] Debug output counter.")
(defvar e2wm:debug-last-text nil "[internal] Last output text.")

(defun e2wm:message (&rest args)
  "Output a message into the debug buffer: *e2wm:debug*."
  (when e2wm:debug
    (with-current-buffer (get-buffer-create "*e2wm:debug*")
      (save-excursion
        (let ((text (apply #'format args)))
          (if (and e2wm:debug-last-text (string= text e2wm:debug-last-text))
              (progn (goto-char (1- (point-max))) (insert "."))
            (goto-char (point-max))
            (insert (format "%5i %s\n" e2wm:debug-count text))
            (setq e2wm:debug-last-text text)))))
    (cl-incf e2wm:debug-count)))

(defun e2wm:message-mark () ; debug
  "Output a mark text into the debug buffer: *e2wm:debug*."
  (interactive)
  (e2wm:message "==================== mark ==== %s"
               (format-time-string "%H:%M:%S" (current-time))))

;; keymap

(defun e2wm:define-keymap (keymap-list &optional prefix)
  "[utility] Return a keymap object with given keymap definitions
that is a list of cons cells ([keyboard macro string]
. [function])."
  (let ((map (make-sparse-keymap)))
    (mapc
     (lambda (i)
       (define-key map
         (if (stringp (car i))
             (read-kbd-macro
              (if prefix
                  (replace-regexp-in-string "prefix" prefix (car i))
                (car i)))
           (car i))
         (cdr i)))
     keymap-list)
    map))

(defun e2wm:add-keymap (keymap keymap-list &optional prefix)
  "[utility] Add given keymap definitions to KEYMAP."
  (mapc
   (lambda (i)
     (define-key keymap
       (if (stringp (car i))
           (read-kbd-macro
            (if prefix
                (replace-regexp-in-string "prefix" prefix (car i))
              (car i)))
         (car i))
       (cdr i)))
   keymap-list)
  keymap)

;; window overriding

(defvar e2wm:ad-now-overriding nil
  "[internal] Recursive execution flag. If e2wm is evaluating
overriding functions, this variable is set t.")

(defmacro e2wm:with-advice (&rest body)
  "[internal] Avoid infinite recursion in the overriding
functions, such as `switch-to-buffer' and `pop-to-buffer'.
If the original function should be called, use this macro."
  (declare (debug (&rest form)))
  `(let ((e2wm:ad-now-overriding t))
     ,@body))

;; text / string

(defun e2wm:string-trim (txt)
  "Remove white space characters at head and tail
from the given string."
  (let ((ret txt))
    (setq ret (if (string-match "^\\s-*" ret)
                  (substring ret (match-end 0))
                ret))
    (or
     (cl-loop for i downfrom (1- (length ret)) downto 0 do
           (if (/= 32 (char-syntax (aref ret i)))
               (cl-return (substring ret 0 (1+ i)))))
     "")))

(defun e2wm:strtime (time)
  "[utility] Format time object."
  (if (equal (cdddr (decode-time time))
             (cdddr (decode-time (current-time))))
      (format-time-string "Today  %H:%M:%S" time)
    (format-time-string   "%Y/%m/%d %H:%M:%S" time)))

(defface e2wm:face-title
  '((((class color) (background light))
     :foreground "Deeppink2" :height 1.5 :inherit variable-pitch)
    (((class color) (background dark))
     :foreground "yellow" :weight bold :height 1.5 :inherit variable-pitch)
    (t :height 1.5 :weight bold :inherit variable-pitch))
  "Face for e2wm titles at level 1."
  :group 'e2wm)

(defface e2wm:face-subtitle
  '((((class color) (background light))
     (:foreground "Gray10" :height 1.2 :inherit variable-pitch))
    (((class color) (background dark))
     (:foreground "Gray90" :height 1.2 :inherit variable-pitch))
    (t :height 1.2 :inherit variable-pitch))
  "Face for e2wm titles at level 2."
  :group 'e2wm)

(defface e2wm:face-item
  '((t :inherit variable-pitch :foreground "DarkSlateBlue"))
  "Face for e2wm items."
  :group 'e2wm)

(defun e2wm:rt (text face)
  "[utility] Put the face property to TEXT."
  (unless (stringp text) (setq text (format "%s" text)))
  (put-text-property 0 (length text) 'face face text) text)

(defun e2wm:rt-format (text &rest args)
  "[utility] Format strings with faces. TEXT is format
string. ARGS is a list of cons cell, ([string] . [face name])."
  (apply 'format (e2wm:rt text 'e2wm:face-item)
         (cl-loop for i in args
               if (consp i)
               collect (e2wm:rt (car i) (cdr i))
               else
               collect (e2wm:rt i 'e2wm:face-subtitle))))

(defun e2wm:tp (text prop value)
  "[utility] Put a text property to the first character of TEXT."
  (if (< 0 (length text))
      (put-text-property 0 1 prop value text))
  text)

(defun e2wm:format-byte-unit (size)
  "[utility] Format a number with the human readable unit."
  (cond ((null size) "NA")
        ((> size (* 1048576 4))
         (format "%s Mb" (e2wm:num (round (/ size 1048576)))))
        ((> size (* 1024 4))
         (format "%s Kb" (e2wm:num (round (/ size 1024)))))
        (t
         (format "%s bytes" (e2wm:num size)))))

(defun e2wm:num (number)
  "[utility] Format a number."
  (if (null number) ""
    (let* ((rsign (if (< number 0) "-" ""))
           (base (format "%s" (abs number)))
           (len (length base)))
      (concat
       rsign
       (mapconcat
        'identity
        (cl-loop
         with ret = nil
         while (> len 0)
         if (< len 3)
         do (progn (setq len 0) (push base ret))
         else
         do (let* ((pos (- len 3))
                   (rest (substring base 0 pos))
                   (it (substring base pos)))
              (setq len pos base rest)
              (push it ret))
         finally return ret)
        ",")))))

(defun e2wm:max-length (rows)
  "[utility] Return the max length of string in the given
sequence. ROWS is a list of string."
  (cl-loop for i in rows
        with lmax = 0
        for ln = (if i (length i) 0)
        do (setq lmax (max lmax ln))
        finally return lmax))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; ### Base API / History Management

(defun e2wm:frame-param-get (name &optional frame)
  "[internal] Return a value from frame properties."
  (frame-parameter (or frame (selected-frame)) name))

(defun e2wm:frame-param-set (name val &optional frame)
  "[internal] Set a frame property."
  (set-frame-parameter (or frame (selected-frame)) name val))

(defun e2wm:document-buffer-p (buffer)
  "If BUFFER is document, return t. See the variable `e2wm:c-document-buffer-p'."
  (if (and buffer (buffer-live-p buffer))
      (funcall e2wm:c-document-buffer-p buffer)))

(defun e2wm:get-blank-buffer ()
  "Get blank buffer.  See the variable `e2wm:c-blank-buffer-name'."
  (e2wm:aif (get-buffer e2wm:c-blank-buffer-name)
      it
    (let ((buf (get-buffer-create e2wm:c-blank-buffer-name)))
      (with-current-buffer buf
        (setq buffer-read-only nil)
        (buffer-disable-undo buf)
        (erase-buffer)
        (setq buffer-read-only t))
      buf)))

;; History data structure
;;
;;           1: buffer a  |
;;           2: buffer b  | history-backup
;; currently displayed
;;        -> 3: buffer c  |
;;           4: buffer d  |
;;           5: buffer e  | history
;;

(defun e2wm:history-get ()
  "Return a list of buffer history from the current frame."
  (e2wm:history-filter-killed-buffers
   (e2wm:frame-param-get 'e2wm:buffer-history)))

(defun e2wm:history-save (buffer-history)
  "Save the given list as buffer history in the current frame."
  (e2wm:frame-param-set
   'e2wm:buffer-history buffer-history)
  buffer-history)

(defun e2wm:history-get-backup ()
  "Return a list of buffer backup-history."
  (e2wm:history-filter-killed-buffers
   (e2wm:frame-param-get
    'e2wm:buffer-history-backup)))

(defun e2wm:history-save-backup (buffer-history-backup)
  "Save the given list as buffer backup-history."
  (e2wm:frame-param-set
   'e2wm:buffer-history-backup
   buffer-history-backup)
  buffer-history-backup)

(defun e2wm:history-filter-killed-buffers (history)
  "[internal] filter killed buffers"
  (cl-loop for buf in history
        when (buffer-live-p buf)
        collect buf))

(defun e2wm:buffer-completion-p (buf)
  "[internal] If `buf' is completion buffer, return not nil."
  (and buf (string-match "\\*Completions\\*" (buffer-name buf))))

(defun e2wm:history-recordable-p (buffer)
  "If BUFFER should be record in buffer history, return t.
See the variable `e2wm:c-recordable-buffer-p'."
  (if (and buffer (buffer-live-p buffer))
      (funcall e2wm:c-recordable-buffer-p buffer)))

(defun e2wm:history-add (buffer)
  "Add BUFFER to buffer history.
This function does following jobs:
* clear all dead buffers
* sort the list of buffer history by LRU
* add a buffer and truncate the tail element
* save the buffer history."
  (e2wm:message "#HISTORY-ADD : %s" buffer)
  (e2wm:aif (get-buffer buffer)
      (let* ((prev-history (e2wm:history-get))
             (last-buffer (car prev-history))
             (history
             (mapcar
               'car
               (sort
                (cl-loop for h in (append
                                (cdr prev-history)
                                (e2wm:history-get-backup))
                     for b = (get-buffer h)
                     if (and b (buffer-live-p b))
                     collect (cons b (float-time
                                      (buffer-local-value
                                       'buffer-display-time b))))
               (lambda (i j)
                 (> (cdr i) (cdr j)))))))
        (when last-buffer
          (setq history (cons last-buffer history)))
        (when (e2wm:history-recordable-p it)
          (e2wm:history-save-backup nil)
          (setq history
                (cons it
                      (if (member it history)
                          (remove it history)
                        (if (< e2wm:c-max-history-num (length history))
                            (nbutlast history) history))))
          (e2wm:history-save history)))))

(defun e2wm:history-back ()
  "Move backward in the buffer history. This function does not update windows."
  (let ((history (e2wm:history-get))
        (history-backup (e2wm:history-get-backup)))
    (when (and history (cdr history))
      (push (pop history) history-backup))
    (e2wm:history-save history)
    (e2wm:history-save-backup history-backup)))

(defun e2wm:history-forward ()
  "Move forward in the buffer history. This function does not update windows."
  (let ((history (e2wm:history-get))
        (history-backup (e2wm:history-get-backup)))
    (when history-backup
      (push (pop history-backup) history))
    (e2wm:history-save history)
    (e2wm:history-save-backup history-backup)))

(defun e2wm:history-delete (buffer)
  "Delete BUFFER from the buffer history. This function does not update windows."
  (let ((history (e2wm:history-get))
        (history-backup (e2wm:history-get-backup)))
    (setq history (remove buffer history))
    (setq history-backup (remove buffer history-backup))
    (when (and (null history) history-backup)
      (push (pop history-backup) history))
    (e2wm:history-save history)
    (e2wm:history-save-backup history-backup)))

(defun e2wm:history-get-next (buffer)
  "Return the buffer that is previous to BUFFER in the buffer history.
If no buffer is found, return BUFFER."
  (let* ((history (append (reverse (e2wm:history-get-backup))
                          (e2wm:history-get))))
    (or (cl-loop for i in history
              with prev = nil
              do
              (when
               (eql buffer i) (cl-return prev))
              (setq prev i))
        buffer)))

(defun e2wm:history-get-prev (buffer)
  "Return the buffer that is next to BUFFER in the buffer history.
If no buffer is found, return BUFFER."
  (let* ((history (append (reverse (e2wm:history-get-backup))
                          (e2wm:history-get))))
    (or (cl-loop for i in history
              with found = nil
              do
              (cond
               (found (cl-return i))
               ((eql buffer i) (setq found t))))
        buffer)))

(defun e2wm:history-get-nearest (buffer n)
  "Return a list of N buffers that is near to the BUFFER but is
*not* the BUFFER. If some buffers are not found, return nil."
  (let* ((history (append (reverse (e2wm:history-get-backup))
                          (e2wm:history-get)))
         (prevs nil)
         (nexts nil))
    (cl-loop for i in history
          for c from 0
          with found = nil
          if (and found (< n c))
          return found
          else
          do (if (eql buffer i)
                 (setq found t)
               (if found
                   (push i nexts)
                 (push i prevs))))
    (if (or prevs nexts)
        (cl-loop for i in (cl-subseq (append prevs (reverse nexts)) 0 n)
              with last-non-nil = nil
              if i collect i and do (setq last-non-nil i)
              else collect last-non-nil)
      nil)))

(defun e2wm:history-get-main-buffer ()
  "Return the main buffer that should be display as the current
editing buffer."
  (e2wm:aif (e2wm:history-get)
      (car it) (e2wm:get-blank-buffer)))

(defun e2wm:managed-p (&optional frame)
  "Return t, if e2wm manages the current frame."
  (e2wm:pst-get-instance frame))

(defun e2wm:internal-buffer-p (buf)
  "Return t, if BUF is internal buffer created by e2wm.
The current implementation check the buffer name. TODO: improve the internal sign."
  (e2wm:aand buf (string-match "\\*WM:" (buffer-name it))))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; ### Perspective Framework

(defvar e2wm:pst-list nil "[internal] Perspective class registory.")
(setq e2wm:pst-list nil)

(defvar e2wm:prev-selected-buffer nil
  "The dynamically bound variable pointed to the previous buffer.
This is available in `init', `start' and `leave' function.
Note that `prev-selected-buffer' is obsolete now.")

;; structure  [ e2wm:$pst-class ]
;;
;;   This structure defines a perspective.
;;   The symbol (*) means the slot must be defined.
;;
;; name    : (*) The identifier symbol for this perspective
;; extend  : A symbol for the base perspective class.
;;         : If the functions described below are set nil, the functions of the base class are called.
;;         : Note that the functions can call the dynamically bound function `e2wm:$pst-class-super' to
;;         : evaluate the base class ones.
;; init    : (*) The constructor function for this perspective. (Arguments: none)
;;         : This function just set up the wset structure object and return it.
;;         : Actual laying out and setting up hooks should be done in the `start' function.
;;         : The dynamically bound variable `e2wm:prev-selected-buffer' can be used at the
;;         : functions `init' and `start'.
;; title   : (*) A string for the title of this perspective.
;; main    : A symbol for the window name which is selected initially.
;;         : If this slot is nil, the e2wm doesn't care of window focus.
;; start   : This function lays out windows and set up buffers and some variables for this perspective.
;;         : (Arguments: `wm')
;;         : If this slot is nil, the e2wm does nothing at the beginning of the perspective.
;;         : This function may be called again, after the evaluating `leave' and
;;         : suspending the e2wm management.
;; update  : This function updates the windows and plug-ins. (Arguments: `wm')
;;         : If this slow it nil, the e2wm just refreshes the windows and plug-ins.
;; switch  : This function overrides `switch-to-buffer'. (Arguments: `buffer')
;;         : If this slot is nil or this function returns nil,
;;         : the original function `switch-to-buffer' is evaluated.
;;         : If this function returns non-nil, the original function `switch-to-buffer' is not evaluated.
;;         : If the plug-ins need to be updated, this function should call the
;;         : `e2wm:pst-update-windows' to update the plug-ins.
;; popup   : This function overrides `pop-to-buffer'. (Arguments: `buffer')
;;         : See the `switch' spec for detail.
;; display : This function overrides `special-display-func'. (Arguments: `buffer')
;;         : See the `switch' spec for detail.
;; after-bury : This function is called after `bury-buffer' or `quit-window'
;;            : unlike other pst-class methods, this method does not override
;;            : the original functions.  (Arguments: `buried-buffer' `window')
;; leave   : This function cleans up buffers and some variables for leaving the perspective.
;;         : (Arguments: `wm')
;;         : If this slot is nil, the e2wm does nothing during leaving the perspective.
;; keymap  : A symbol for the key map of this perspective.
;; save    : This function is called by the hook `after-save-hook' when this perspective is active.

(cl-defstruct e2wm:$pst-class
  name title extend
  init main start update switch popup display after-bury leave
  keymap save)

(defun e2wm:pst-class-register (pst-class)
  "Register a perspective class. If the class which name is
 the same as PST-CLASS has been already registered, the given class
overrides the previous one."
  (when (e2wm:aand (e2wm:$pst-class-extend pst-class)
                  (symbolp it))
    ;; A symbol for the super class is replaced by the class object.
    (setf (e2wm:$pst-class-extend pst-class)
          (e2wm:pst-class-get (e2wm:$pst-class-extend pst-class))))
  (e2wm:pst-class-remove pst-class)
  (push pst-class e2wm:pst-list))

(defun e2wm:pst-class-remove (pst-class)
  "Remove the class from the perspective class registry."
  (setq e2wm:pst-list
        (cl-loop with name = (e2wm:$pst-class-name pst-class)
              for i in e2wm:pst-list
              unless (equal name (e2wm:$pst-class-name i))
              collect i)))

(defun e2wm:pst-class-get (name)
  "Return the class object which name is NAME."
  (e2wm:find name 'e2wm:$pst-class-name e2wm:pst-list))

(defun e2wm:pst-class-abstract-p (pst-class)
  "Return non-`nil' when PST-CLASS does not have all mandatory
slots (i.e., `:init' and `:title')."
  (and pst-class
       (not (e2wm:$pst-class-init pst-class))
       (not (e2wm:$pst-class-title pst-class))))


;; structure [e2wm:$pst]
;;
;;   This structure represents an instance of the perspective.
;;
;; name    : A symbol for this perspective
;; wm      : wlf layout object
;; focus   : name of focused window (if any)
;; type    : A reference to the perspective class object

(cl-defstruct e2wm:$pst name wm focus type)

(defun e2wm:$pst-get-prop (name pst)
  "[internal] Return the value of this perspective."
  (let ((slot-name (intern (format "e2wm:$pst-class-%s" name))))
    (e2wm:$pst-class-get-prop-gen slot-name (e2wm:$pst-type pst))))

(defun e2wm:$pst-class-get-prop-gen (slot-name pst-class)
  "[internal] Return the slot value of this perspective class."
  (or (funcall slot-name pst-class)
      (e2wm:aif (e2wm:$pst-class-extend pst-class)
          (e2wm:$pst-class-get-prop-gen slot-name it))))

(defun e2wm:method-call (method-name class error-on-nil &rest args)
  "[internal] Call the method which belongs to the perspective class.
If ERROR-ON-NIL is non-nil and the CLASS has no value at the slot,
raise the error signal with ERROR-ON-NIL."
  (let ((method (e2wm:$pst-class-get-prop-gen method-name class))
        (super-class (e2wm:$pst-class-extend class)))
    (cond
     ((null method)
      (if error-on-nil (error error-on-nil) nil))
     (t
      (cl-letf (((symbol-function 'e2wm:$pst-class-super)
                 (lambda () (apply
                             #'e2wm:method-call
                             method-name super-class
                             error-on-nil args))))
        (apply method args))))))

(defmacro e2wm:pst-method-call (method-name pst-instance &rest args)
  "[internal] Short cut macro. (pst-instance -> pst-class)"
  `(e2wm:method-call
    ',method-name
    (e2wm:$pst-type ,pst-instance) nil ,@args))

(defun e2wm:$pst-class-super ()
  "Dynamically bound super class method of the current perspective method.

WARNING: Call this function only *inside* of a perspective method
which class (`e2wm:$pst-class') has the `:extend' slot.

This function is a dummy implementation for suppressing compile
warning and providing information to user via docstring and error
message.  Directly calling this function raises error.

See `e2wm:method-call' for implementation."
  (error "e2wm:$pst-class-super is called outside of perspective method."))

(defun e2wm:$pst-title (pst)
  (e2wm:$pst-get-prop 'title pst))
(defun e2wm:$pst-main (pst)
  (e2wm:$pst-get-prop 'main pst))
(defun e2wm:$pst-keymap (pst)
  (e2wm:aif (e2wm:$pst-get-prop 'keymap pst)
      (symbol-value it) nil))

(defun e2wm:$pst-start (pst)
  (e2wm:$pst-class-start (e2wm:$pst-type pst)))
(defun e2wm:$pst-update (pst)
  (e2wm:$pst-class-update (e2wm:$pst-type pst)))
(defun e2wm:$pst-switch (pst)
  (e2wm:$pst-class-switch (e2wm:$pst-type pst)))
(defun e2wm:$pst-popup (pst)
  (e2wm:$pst-class-popup (e2wm:$pst-type pst)))
(defun e2wm:$pst-leave (pst)
  (e2wm:$pst-class-leave (e2wm:$pst-type pst)))
(defun e2wm:$pst-save (pst)
  (e2wm:$pst-class-save (e2wm:$pst-type pst)))
(defun e2wm:$pst-super (pst)
  (e2wm:$pst-class-extend (e2wm:$pst-type pst)))

(defun e2wm:pst-get-instance (&optional frame)
  (e2wm:frame-param-get 'e2wm:pst frame))
(defun e2wm:pst-set-instance (pst-instance &optional frame)
  (e2wm:frame-param-set 'e2wm:pst pst-instance frame))

(defun e2wm:pst-get-prev-pst ()
  (e2wm:frame-param-get 'e2wm:prev-pst))
(defun e2wm:pst-set-prev-pst (pst-name)
  (e2wm:frame-param-set 'e2wm:prev-pst pst-name))

(defun e2wm:pst-copy-instance ()
  "[internal] Copy the current perspective instance."
  (let ((i (e2wm:pst-get-instance)))
    (make-e2wm:$pst
     :name   (e2wm:$pst-name   i)
     :wm     (wlf:copy-windows (e2wm:pst-get-wm))
     :focus  (wlf:get-window-name (e2wm:pst-get-wm)
                                  (if (= (minibuffer-depth) 0)
                                      (selected-window)
                                    (minibuffer-selected-window)))
     :type   (e2wm:$pst-type   i))))

(defun e2wm:pst-get-wm ()
  "Return the window layout object of the current perspective."
  (e2wm:aif (e2wm:pst-get-instance)
      (e2wm:$pst-wm it)))

(defun e2wm:pst-update-windows (&optional rebuild-windows)
  "Update all buffers of the windows and plug-ins.  If
REBUILD-WINDOWS is non-nil, windows are destroyed and new windows
are created."
  (e2wm:message "#PST-UPDATE")
  (e2wm:with-advice
   (let* ((instance (e2wm:pst-get-instance))
          (wm (e2wm:$pst-wm instance)))
     ;;(e2wm:debug-windows (e2wm:pst-get-wm))
     (unless rebuild-windows
       (wlf:wset-fix-windows wm))
     (when (or rebuild-windows
               (not (wlf:wset-live-p wm)))
       (e2wm:message "  #PST-UPDATE > REBUILD")
       (wlf:refresh wm)
       (e2wm:aif (e2wm:$pst-main instance)
           (wlf:select wm it)))
     ;; Update task for the current perspective
     ;; (Plug-ins are updated by `e2wm:dp-base-update')
     (e2wm:pst-method-call e2wm:$pst-class-update instance wm)
     )) t)

(defun e2wm:pst-switch-to-buffer (buf)
  "[internal] Delegate the `switch' function of the current perspective."
  (e2wm:message "#PST-SWITCH %s" buf)
  (e2wm:pst-method-call e2wm:$pst-class-switch (e2wm:pst-get-instance) buf))

(defun e2wm:pst-pop-to-buffer (buf)
  "[internal] Delegate the `popup' function of the current perspective."
  (e2wm:message "#PST-POPUP %s" buf)
  (e2wm:pst-method-call e2wm:$pst-class-popup (e2wm:pst-get-instance) buf))

(defun e2wm:pst-display-buffer (buf)
  "[internal] Delegate the `display' function of the current perspective."
  (e2wm:message "#PST-DISPLAY %s" buf)
  (e2wm:pst-method-call e2wm:$pst-class-display (e2wm:pst-get-instance) buf))

(defun e2wm:pst-after-bury-buffer (buried-buffer window)
  (e2wm:message "#PST-AFTER-BURY %s" buried-buffer)
  (e2wm:pst-method-call e2wm:$pst-class-after-bury (e2wm:pst-get-instance)
                        buried-buffer window))

(defun e2wm:pst-change (next-pst-name)
  "Leave the current perspective and start the new perspective."
  (e2wm:message "#PST-CHANGE %s" next-pst-name)
  (when (not (e2wm:managed-p))
    (e2wm:start-management nil nil t))
  (let ((prev-pst-instance (e2wm:pst-get-instance))
        (next-pst-class (e2wm:pst-class-get next-pst-name))
        (e2wm:prev-selected-buffer (current-buffer))
        (prev-selected-buffer (current-buffer)))
    (when (e2wm:internal-buffer-p e2wm:prev-selected-buffer)
      (setq e2wm:prev-selected-buffer nil)
      (setq prev-selected-buffer nil))
    (cond
     ((null next-pst-class)
      (error "Perspective [%s] is not found." next-pst-name))
     (t
      (e2wm:aif prev-pst-instance
          (progn
            (e2wm:pst-method-call e2wm:$pst-class-leave it (e2wm:$pst-wm it))
            (unless (eql next-pst-name (e2wm:$pst-name it))
              (e2wm:pst-set-prev-pst (e2wm:$pst-name it)))))
      (let* ((next-pst-wm
              (e2wm:method-call 'e2wm:$pst-class-init
                               next-pst-class
                               (format "[%s] init method is nil!" next-pst-name)))
             (next-pst-instance
              (make-e2wm:$pst :name next-pst-name
                             :wm next-pst-wm
                             :type next-pst-class)))
        (e2wm:pst-set-instance next-pst-instance)
        (e2wm:pst-change-keymap (e2wm:$pst-keymap next-pst-instance))
        (e2wm:pst-method-call e2wm:$pst-class-start next-pst-instance
                             (e2wm:$pst-wm next-pst-instance)))))
    (e2wm:pst-update-windows t)))

(defun e2wm:pst-change-prev ()
  "[internal] Change to the previous perspective."
  (e2wm:aif (e2wm:pst-get-prev-pst)
      (progn
        (e2wm:message "#PREV-PST : %s" it)
        (e2wm:pst-change it))))

(defvar e2wm:pst-minor-mode-keymap
      (e2wm:define-keymap
       '(("prefix Q"   . e2wm:stop-management)
         ("prefix l"   . e2wm:pst-update-windows-command)
         ("prefix n"   . e2wm:pst-history-down-command)
         ("prefix p"   . e2wm:pst-history-up-command)
         ("prefix <DEL>" . e2wm:pst-change-prev-pst-command)
         ) e2wm:prefix-key)
      "Common key map for all perspectives. (See `e2wm:pst-change-keymap')")

(defun e2wm:pst-change-keymap (new-keymap)
  "[internal] Add the perspective key map to the common key map."
  (let ((map (copy-keymap
              (or new-keymap e2wm:pst-minor-mode-keymap))))
    (when new-keymap
      (set-keymap-parent map e2wm:pst-minor-mode-keymap))
    (e2wm:aif (assq 'e2wm:pst-minor-mode minor-mode-map-alist)
        (setf (cdr it) map))))

(defun e2wm:pst-resume (pst-instance)
  "[internal] Resume the perspective which is suspended by the function `e2wm:pst-finish'."
  (e2wm:message "#PST-RESUME %s" pst-instance)
  ;; This function assumes that the window configuration is
  ;; restored by `set-window-configuration'.
  (e2wm:pst-set-instance pst-instance)
  (e2wm:pst-change-keymap (e2wm:$pst-keymap pst-instance))
  (e2wm:pst-method-call e2wm:$pst-class-start pst-instance (e2wm:$pst-wm pst-instance)))

(defun e2wm:pst-finish (&optional frame)
  "[internal] Suspend the current perspective for finishing e2wm or
switching the window configuration to the non-e2wm frame during
the other application calling `set-window-configuration'."
  (e2wm:message "#PST-FINISH")
  (let ((prev-pst-instance (e2wm:pst-get-instance frame)))
    (when prev-pst-instance
      (e2wm:pst-method-call e2wm:$pst-class-leave prev-pst-instance
                           (e2wm:$pst-wm prev-pst-instance)))
    (e2wm:pst-set-instance nil frame)))

(defun e2wm:pst-window-option-get (wm window-name)
  "Return a plist of the plug-in option at the WINDOW-NAME window."
  (wlf:window-options
   (wlf:get-winfo window-name (wlf:wset-winfo-list wm))))

(defun e2wm:pst-window-plugin-get (wm window-name)
  "Return a symbol of the plug-in at the WINDOW-NAME window. "
  (plist-get (e2wm:pst-window-option-get wm window-name)
             ':plugin))

(defun e2wm:pst-window-plugin-set (wm window-name plugin-name)
  "Set the plug-in at the WINDOW-NAME window."
  (plist-put (e2wm:pst-window-option-get wm window-name)
             ':plugin plugin-name))

(defun e2wm:pst-buffer-get (window-name)
  "Return the buffer object at the WINDOW-NAME window."
  (let ((wm (e2wm:pst-get-wm)))
    (when (wlf:window-name-p wm window-name)
      (wlf:get-buffer wm window-name))))

(defun e2wm:pst-buffer-set (window-name buffer &optional showp selectp)
  "Set the given BUFFER at the WINDOW-NAME window.
If SHOWP is non-nil, the hided window is displayed.
If SELECTP is non-nil, the window is selected."
  (let ((wm (e2wm:pst-get-wm)))
    (when (wlf:window-name-p wm window-name)
      (when (and showp (not (wlf:get-window wm window-name)))
        (wlf:show wm window-name))
      (wlf:set-buffer wm window-name buffer selectp)
      (when showp
        (set-window-point
         (wlf:get-window wm window-name)
         (with-current-buffer buffer (point)))))))

(defun e2wm:pst-window-select (window-name)
  "Select the WINDOW-NAME window."
  (let ((wm (e2wm:pst-get-wm)))
    (when (wlf:window-name-p wm window-name)
      (wlf:select wm window-name))))

(defun e2wm:pst-window-select-main ()
  "Select the `main' window which is defined by the perspective.
If the perspective has no `main' window, this function does nothing."
  (let ((main (e2wm:$pst-main (e2wm:pst-get-instance)))
        (wm (e2wm:pst-get-wm)))
    (when (and main (wlf:window-name-p wm main))
      (wlf:select wm main))))

(defun e2wm:pst-window-toggle (window-name &optional selectp next-window)
  "Toggle visibility of the window specified by WINDOW-NAME.
If SELECTP is non-nil, it selects that window when opening it.
NEXT-WINDOW specifies the window to select when closing the
WINDOW-NAME window.  This function returns the name of the
selected window, or nil if none is selected."
  (let ((wm (e2wm:pst-get-wm)))
    (when (wlf:window-name-p wm window-name)
      (wlf:toggle wm window-name)
      (if (wlf:window-displayed-p wm window-name)
          (when selectp (wlf:select wm window-name) window-name)
        (when next-window (wlf:select wm next-window) next-window)))))

(defun e2wm:pst-show-history-main ()
  "Display the history top buffer at the `main' window which is
defined by the perspective."
  (e2wm:with-advice
   (let* ((instance (e2wm:pst-get-instance))
          (wm (e2wm:$pst-wm instance)))
     (e2wm:aif (e2wm:$pst-main instance)
         (wlf:set-buffer wm it (e2wm:history-get-main-buffer)))
     (e2wm:pst-update-windows))))

(defun e2wm:pst-after-save-hook ()
  "[internal] Hook for `after-save-hook'."
  (e2wm:message "$$ AFTER SAVE HOOK %S" this-command)
  ;; Ignore save events those are triggered by timers.
  (when this-command
    (e2wm:pst-method-call e2wm:$pst-class-save (e2wm:pst-get-instance))
    (e2wm:pst-update-windows)))

;;; Commands / Key bindings / Minor Mode
;;;--------------------------------------------------

(defun e2wm:pst-change-command ()
  (interactive)
  (let* ((pst-list (mapcar
                    (lambda (i)
                      (symbol-name (e2wm:$pst-class-name i)))
                    e2wm:pst-list))
         (pst-name (completing-read "Chagne parspective: " pst-list)))
    (when pst-name
      (e2wm:pst-change (intern pst-name)))))
(defun e2wm:pst-window-select-main-command ()
  (interactive)
  (e2wm:pst-window-select-main))
(defun e2wm:pst-update-windows-command ()
  (interactive)
  (when (e2wm:managed-p)
    (e2wm:with-advice
     (let ((livep (wlf:wset-live-p (e2wm:pst-get-wm))))
       (wlf:reset-window-sizes (e2wm:pst-get-wm))
       (e2wm:pst-update-windows (not livep))))))
(defun e2wm:pst-change-prev-pst-command ()
  (interactive)
  (when (e2wm:managed-p)
    (e2wm:pst-change-prev)))
(defun e2wm:pst-history-forward-command ()
  (interactive)
  (when (e2wm:managed-p)
    (e2wm:history-forward)
    (e2wm:pst-show-history-main)))
(defun e2wm:pst-history-back-command ()
  (interactive)
  (when (e2wm:managed-p)
    (e2wm:history-back)
    (e2wm:pst-show-history-main)))
(defalias 'e2wm:pst-history-up-command 'e2wm:pst-history-forward-command)
(defalias 'e2wm:pst-history-down-command 'e2wm:pst-history-back-command)

(defvar e2wm:pst-minor-mode-setup-hook nil "This hook is called at end of setting up pst-minor-mode.")
(defvar e2wm:pst-minor-mode-abort-hook nil "This hook is called at end of aborting pst-minor-mode.")

(defvar e2wm:pst-minor-mode nil) ; dummy

(defvar e2wm:pst-mode-line-format " E2wm(%s)" "Mode line format for e2wm.")

;;グローバルでマイナーモードを定義
(define-minor-mode e2wm:pst-minor-mode
  "Perspective mode"
  :init-value nil
  :global t
  :lighter (:eval (format e2wm:pst-mode-line-format
                          (if (e2wm:managed-p) (e2wm:$pst-name (e2wm:pst-get-instance)) "none")))
  :keymap e2wm:pst-minor-mode-keymap
  :group 'e2wm:pst-mode
  (if e2wm:pst-minor-mode
      (progn
        (e2wm:pst-minor-mode-setup)
        (add-hook 'delete-frame-functions 'e2wm:delete-frame-functions)
        (run-hooks 'e2wm:pst-minor-mode-setup-hook))
    (e2wm:pst-minor-mode-abort)
    (remove-hook 'delete-frame-functions 'e2wm:delete-frame-functions)
    (run-hooks 'e2wm:pst-minor-mode-abort-hook)))

(defun e2wm:pst-minor-mode-setup ()
  (add-to-list 'after-make-frame-functions 'e2wm:override-after-make-frame)
  (ad-activate-regexp "^e2wm:ad-frame-override$" t)
  (e2wm:pst-minor-mode-enable-frame)
)

(defun e2wm:pst-minor-mode-abort ()
  (setq after-make-frame-functions
        (remove 'e2wm:override-after-make-frame after-make-frame-functions))
  (ad-deactivate-regexp "^e2wm:ad-frame-override$")
  (e2wm:pst-minor-mode-disable-frame)
)

;;管理対象frameだけキーマップを有効にするアドバイス

(defvar e2wm:pst-minor-mode-keymap-blank (make-sparse-keymap) "[internal]")

(defun e2wm:pst-minor-mode-disable-frame (&optional frame)
  (e2wm:message "## PST MM DISABLED ON %s" frame)
  ;;グローバルマイナーモードは有効のままで、アドバイス、キーマップのみ無効にする
  ;;特定のフレームで有効というイメージ
  (e2wm:aif (assq 'e2wm:pst-minor-mode minor-mode-map-alist)
      (setf (cdr it) e2wm:pst-minor-mode-keymap-blank))

  (setq display-buffer-alist (cl-remove e2wm:display-buffer-alist-item display-buffer-alist))
  (remove-hook 'kill-buffer-hook 'e2wm:kill-buffer-hook)
  (remove-hook 'window-configuration-change-hook
               'e2wm:override-window-cfg-change)
  (remove-hook 'completion-setup-hook 'e2wm:override-setup-completion)
  (remove-hook 'after-save-hook 'e2wm:pst-after-save-hook)
  (remove-hook 'next-error-hook 'e2wm:select-window-point)
  (ad-deactivate-regexp "^e2wm:ad-override$")
  )

(setq e2wm:display-buffer-alist-item '(t  . ((e2wm:override-special-display-function) . nil)))

(defun e2wm:pst-minor-mode-enable-frame (&optional frame)
  (e2wm:message "## PST MM ENABLED ON %s" frame)
  (e2wm:aif (e2wm:pst-get-instance frame)
      (e2wm:pst-change-keymap (e2wm:$pst-keymap it)))

  (ad-activate-regexp "^e2wm:ad-override" t)
  (add-hook 'kill-buffer-hook 'e2wm:kill-buffer-hook)
  (add-hook 'window-configuration-change-hook
            'e2wm:override-window-cfg-change)
  (add-hook 'completion-setup-hook 'e2wm:override-setup-completion)
  (add-hook 'after-save-hook 'e2wm:pst-after-save-hook)
  (add-hook 'next-error-hook 'e2wm:select-window-point)
  (add-to-list 'display-buffer-alist e2wm:display-buffer-alist-item)
  (setq display-buffer-function 'e2wm:override-special-display-function))

(defun e2wm:pst-minor-mode-switch-frame (frame)
  (e2wm:message "## PST MM SWITCH [%s] / %s"
                (not (null (e2wm:managed-p frame))) frame)
  (cond
   ((e2wm:managed-p frame)
    (e2wm:pst-minor-mode-enable-frame frame))
   (t
    (e2wm:pst-minor-mode-disable-frame frame))))

(defadvice handle-switch-frame (around e2wm:ad-frame-override (event))
  ad-do-it
  (e2wm:message "## FRAME SWITCH [%s] <- (%s)" event (selected-frame))
  (when (eq 'switch-frame (car event))
    (e2wm:pst-minor-mode-switch-frame (cadr event))))

(defun e2wm:override-after-make-frame (frame)
  (e2wm:message "## MAKE FRAME [%s] <- (%s)" frame (selected-frame))
  (e2wm:pst-minor-mode-switch-frame frame))

(defadvice handle-delete-frame (around e2wm:ad-frame-override (event))
  (e2wm:message "## 1 FRAME DELETE [%s] " event)
  (let* ((frame (car (cadr event)))
         (next-frame (next-frame frame)))
    (e2wm:message "## 2 FRAME DELETE [%s] -> (%s)" frame next-frame)
    (e2wm:pst-minor-mode-switch-frame next-frame)
    (select-frame next-frame))
  ad-do-it)

(defun e2wm:other-managed-frames (frame)
  "[internal] Get a list of manged frames other than FRAME."
  (filtered-frame-list (lambda (f) (and (not (eq f frame))
                                        (e2wm:managed-p f)))))

(defun e2wm:delete-frame-functions (frame)
  (e2wm:message "## DELETE FRAME HOOK [%s] " frame)
  (let* ((next-frame (car (e2wm:other-managed-frames frame))))
    (when next-frame
      (e2wm:message "## NEXT FRAME [%s] -> (%s)" frame next-frame)
      (e2wm:pst-minor-mode-switch-frame next-frame)
      (select-frame next-frame))))

(defadvice other-frame (after e2wm:ad-frame-override)
  (e2wm:message "## OTHER FRAME [%s] " (selected-frame))
  (e2wm:pst-minor-mode-switch-frame (selected-frame)))

;;; Perspective Set
;; 好みのパースペクティブのセットを作って選べるようにする

(defun e2wm:pstset-defaults()
  ;;abstract classとarray以外を全部つっこむ
  (e2wm:pstset-define
   (nreverse
    (cl-loop for i in e2wm:pst-list
          unless (or (memq (e2wm:$pst-class-name i) '(array))
                     (e2wm:pst-class-abstract-p i))
          collect (e2wm:$pst-class-name i)))))

(defun e2wm:pstset-define (names)
  ;;引数：パースペクティブのシンボルのリスト
  (cl-loop for i in names
        unless (e2wm:pst-class-get i)
        do (error "Perspective [%s] not found." i))
  (e2wm:frame-param-set 'e2wm:pstset names))

(defun e2wm:pstset-get-current-pstset ()
  (e2wm:frame-param-get 'e2wm:pstset))

(defun e2wm:pstset-next-pst-command ()
  ;; 現在のセットで次のパースペクティブに切り替える
  (interactive)
  (e2wm:aif (e2wm:pst-get-instance)
      (let* ((pset (e2wm:pstset-get-current-pstset))
             (now (e2wm:$pst-name it))
             (pos (cl-position now pset)))
        (e2wm:aand pos (nth (1+ it) pset)
                  (e2wm:pst-change it)))))

(defun e2wm:pstset-prev-pst-command ()
  ;; 現在のセットで前のパースペクティブに切り替える
  (interactive)
  (e2wm:aif (e2wm:pst-get-instance)
      (let* ((pset (e2wm:pstset-get-current-pstset))
             (now (e2wm:$pst-name it))
             (pos (cl-position now pset)))
        (e2wm:aand pos (nth (1- it) pset)
                  (e2wm:pst-change it)))))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; ### Advices / Overriding Functions

(defadvice switch-to-buffer (around
                             e2wm:ad-override
                             (buf &optional norecord force-same-window))
  (e2wm:message "#SWITCH-TO-BUFFER %s" buf)
  (let (overrided)
    (when (and buf
               (not e2wm:ad-now-overriding) ; 再入してなくて
               (e2wm:managed-p)) ; 管理対象フレームの場合は乗っ取る
      (e2wm:with-advice
       (e2wm:message "#AD-SWITCH-TO-BUFFER %s" buf)
       (e2wm:history-add buf)
       (setq overrided (e2wm:pst-switch-to-buffer (get-buffer-create buf)))))
    (if overrided
        (progn
          (set-buffer buf)
          (setq ad-return-value (get-buffer-create buf)))
      ad-do-it))) ; それ以外はもとの関数へ（画面更新はしないので必要な場合は自分でする）

(defadvice pop-to-buffer (around
                          e2wm:ad-override
                          (buf &optional other-window norecord))
  (e2wm:message "#POP-TO-BUFFER %s" buf)
  (let (overrided)
    (when (and buf
               (not e2wm:ad-now-overriding) ; 再入してなくて
               (e2wm:managed-p)) ; 管理対象フレームの場合は乗っ取る
      (e2wm:with-advice
       (e2wm:message "#AD-POP-TO-BUFFER %s" buf)
       (e2wm:history-add buf)
       (setq overrided (e2wm:pst-pop-to-buffer (get-buffer-create buf)))))
    (if overrided
        (progn
          (set-buffer buf)
          (setq ad-return-value (get-buffer-create buf)))
      ad-do-it))) ; それ以外はもとの関数へ（画面更新はしないので必要な場合は自分でする）

(defadvice pop-to-buffer-same-window (around
                                      e2wm:ad-override
                                      (buf &optional norecord))
  (e2wm:message "#POP-TO-BUFFER-SAME-WINDOW %s" buf)
  (let (overrided)
    (when (and buf
               (not e2wm:ad-now-overriding) ; 再入してなくて
               (e2wm:managed-p)) ; 管理対象フレームの場合は乗っ取る
      (e2wm:with-advice
       (e2wm:message "#AD-SWITCH-TO-BUFFER %s" buf)
       (e2wm:history-add buf)
       (setq overrided (e2wm:pst-switch-to-buffer (get-buffer-create buf)))))
    (if overrided
        (progn
          (set-buffer buf)
          (setq ad-return-value (get-buffer-create buf)))
      ad-do-it))) ; それ以外はもとの関数へ（画面更新はしないので必要な場合は自分でする）

(defun e2wm:after-bury-buffer (buried-buffer window)
  "[internal] This function is called after `bury-buffer' or
`quit-window' call, resets the buffer tracked by e2wm and
removes the buried buffer from the history list."
  (when (e2wm:managed-p)
    (e2wm:pst-after-bury-buffer buried-buffer window)))

(defadvice quit-window (around
                        e2wm:ad-override
                        (&optional kill window))
  "[internal] call `e2wm:after-bury-buffer'."
  (cond
   ((e2wm:managed-p)
    (e2wm:message "#QUIT-WINDOW %s %s" kill window)
    (let ((curwin (or window (selected-window)))
          (buffer (window-buffer window)))
      ad-do-it
      (e2wm:after-bury-buffer buffer curwin)))
   (t ad-do-it)))

(eval-and-compile
  (unless (fboundp 'window-normalize-buffer)
    (defun window-normalize-buffer (buffer-or-name)
      "Return buffer specified by BUFFER-OR-NAME.
 (This function is copied from Emacs 24 for the fallback on Emacs 23.)"
      (cond
       ((not buffer-or-name)
        (current-buffer))
       ((bufferp buffer-or-name)
        (if (buffer-live-p buffer-or-name)
            buffer-or-name
          (error "Buffer %s is not a live buffer" buffer-or-name)))
       ((get-buffer buffer-or-name))
       (t
        (error "No such buffer %s" buffer-or-name))))))

(defadvice bury-buffer (around
                        e2wm:ad-override
                        (&optional buffer-or-name))
  "[internal] call `e2wm:after-bury-buffer'."
  (cond
   ((e2wm:managed-p)
    (e2wm:message "#BURY-BUFFER %s" buffer-or-name)
    (let ((curwin (selected-window))
          (buffer (window-normalize-buffer buffer-or-name)))
      ad-do-it
      (e2wm:after-bury-buffer buffer curwin)))
   (t ad-do-it)))


(defun e2wm:override-special-display-function (buf &optional args)
  ""
  (e2wm:message "#SPECIAL-DISPLAY-FUNC %s / %S - %S" buf (not e2wm:ad-now-overriding) (e2wm:managed-p))
  (unless (buffer-live-p buf)    ; similar code is in `display-buffer'
    (error "Invalid buffer"))
  (let (overrided)
    (when (and
           buf
           (not e2wm:ad-now-overriding) ; 再入してなくて
           (e2wm:managed-p)) ; 管理対象フレームの場合は乗っ取る
      (e2wm:with-advice
       (e2wm:message "#AD-SPECIAL-DISPLAY-FUNC %s" buf)
       (e2wm:history-add buf)
       (save-excursion
         (setq overrided (e2wm:pst-display-buffer (get-buffer-create buf))))))
    (if overrided
        (progn
          ;(set-buffer buf)
          (get-buffer-window buf)) ;return value
      (cond
       ((e2wm:managed-p)
        (e2wm:message "#DISPLAY-BUFFER / managed frame") ;; 適当な場所に表示する
        (set-window-buffer (selected-window) buf)
        ;(set-buffer buf)
        (selected-window)) ;return value
       (t
        (e2wm:message "#DISPLAY-BUFFER / Non managed frame ") ;; デフォルトに任せる
        nil) ; return value
       ))))

(defun e2wm:kill-buffer-hook ()
  "[internal] Update windows which showed the killed buffer.
Called via `kill-buffer-hook'."
  (e2wm:message "#KILL HOOK")
  (when (and (e2wm:history-recordable-p (current-buffer))
             (e2wm:managed-p))
    ;; If kill is *not* called by command, don't change windows
    (when this-command
      ;; search through the existing windows which show the killed buffer
      (let* ((killedbuf (current-buffer))
             (wm (e2wm:pst-get-wm))
             (wins (cl-loop for winfo in (wlf:wset-winfo-list wm)
                         for wname = (wlf:window-name winfo)
                         when (equal (wlf:get-buffer wm wname) killedbuf)
                         collect wname))
             (buffers (e2wm:history-get-nearest killedbuf (length wins)))
             (main-wname (e2wm:$pst-main (e2wm:pst-get-instance))))
        (cond
         (buffers
          (cl-loop for wname in wins
                for buf in buffers
                do
                (when (equal wname main-wname)
                  (e2wm:history-add buf))
                (wlf:set-buffer wm wname buf)))
         ((and wins main-wname)
          (wlf:set-buffer wm main-wname (e2wm:get-blank-buffer))))))
    ;; remove it from the history list
    (e2wm:history-delete (current-buffer))
    (when this-command
      (e2wm:pst-update-windows))))

;; delete-other-windows対策

(defvar e2wm:delete-other-windows-permission nil "[internal] If this
value is t, one can execute `delete-other-windows' under the e2wm
management. For window-layout.el.")

(defadvice wlf:clear-windows (around e2wm:ad-override)
  (let ((e2wm:delete-other-windows-permission t))
    ad-do-it))

(defadvice delete-other-windows (around e2wm:ad-override)
  (when (or e2wm:delete-other-windows-permission (not (e2wm:managed-p)))
    ad-do-it))

;; コンパイルエラーのような他のウインドウへの表示をする拡張への対応
;; compile-goto-error の仕組みを使うものについては next-error-hook で実行

(defun e2wm:move-window-point (&optional buf)
  ;; ウインドウの表示位置のみを更新
  (let ((buf (or buf (current-buffer))))
    (when (and
           (e2wm:managed-p)
           (eq (wlf:get-window (e2wm:pst-get-wm) 'sub) (selected-window))
           (not (eql (selected-window) (get-buffer-window buf))))
      (set-window-point
       (get-buffer-window buf)
       (with-current-buffer buf (point))))))

(defun e2wm:select-window-point (&optional buf)
  ;; ウインドウを選択して表示位置を更新
  (let ((buf (or buf (current-buffer))))
    (when (and
           (e2wm:managed-p)
           (eq (wlf:get-window (e2wm:pst-get-wm) 'sub) (selected-window))
           (not (eql (selected-window) (get-buffer-window buf))))
      (set-window-point
       (get-buffer-window buf)
       (with-current-buffer buf (point)))
      (select-window (get-buffer-window buf)))))

;; set-window-configuration 対策
;; いろいろ試行錯誤中。

(defvar e2wm:override-window-ext-managed nil) ; Elscreenのように、別アプリがフレームを管理している場合はt

(defun e2wm:debug-windows (wm)
  (e2wm:message " # WINDOWS : %s"
               (cl-loop for winfo in (wlf:wset-winfo-list wm)
                     collect (wlf:window-window winfo))))

;;e2wm:$wcfg ウインドウ配置構造体
;; wcfg  : 本来のcurrent-window-configurationでとれるウインドウ配置オブジェクト
;; pst   : パースペクティブのインスタンスのコピー
;; count : デバッグ用カウンタ
(cl-defstruct e2wm:$wcfg wcfg pst count)

(defun e2wm:override-custom-wcfg-p (cfg)
  (e2wm:$wcfg-p cfg))

(defvar e2wm:override-window-cfg-change-now nil) ; e2wm:override-window-cfg-change 実行中ならt。再帰呼び出しを防ぐ。
(defvar e2wm:override-window-cfg-backup nil "[internal] Backup window configuration.")

(defun e2wm:override-window-cfg-change ()
  ;; window-configuration-change-hook関数
  (when (and (e2wm:managed-p) ; e2wm管理中で
             (null e2wm:override-window-cfg-change-now) ; 初回実行で
             (= (minibuffer-depth) 0) ; ミニバッファ実行中でなくて
             (and e2wm:override-window-cfg-backup ; 補完前のウインドウ配置が空でなくて
                  (not (window-configuration-equal-p ; 配置が違ってたら
                        e2wm:override-window-cfg-backup
                        (current-window-configuration)))))
    (setq e2wm:override-window-cfg-change-now t)
    (unwind-protect
        (e2wm:override-restore-window-cfg) ; 配置を戻す
      (setq e2wm:override-window-cfg-change-now nil))))

(defun e2wm:override-setup-completion ()
  ;;completionバッファが終了したとき、set-window-configurationが呼ばれずに
  ;;window配置が元に戻される。なので、completionから戻ったときには
  ;;windwo-configuration-change-hookを捕まえて自前で
  ;;window配置を直すようにする。
  (when (and (e2wm:managed-p) (null e2wm:override-window-cfg-backup))
    (e2wm:message "#OVERRIDE-SETUP-COMPLETION")
    ;;(e2wm:debug-windows (e2wm:pst-get-wm))
    (setq e2wm:override-window-cfg-backup
          (current-window-configuration))))

(defun e2wm:override-restore-window-cfg ()
  (interactive)
  (when e2wm:override-window-cfg-backup
    (e2wm:message "#RESTORE-WINDOW-CFG")
    (set-window-configuration e2wm:override-window-cfg-backup)
    (setq e2wm:override-window-cfg-backup nil)
    (let ((i (e2wm:pst-get-instance)))
      (e2wm:aif (or (e2wm:$pst-focus i)
                    (e2wm:$pst-main i))
        (wlf:select (e2wm:$pst-wm i) it)))))

(defvar e2wm:override-window-cfg-count 0 "[internal] Window configuration counter")

(defadvice current-window-configuration (around e2wm:ad-override)
  (let ((cfg ad-do-it))
    (cl-incf e2wm:override-window-cfg-count)
    ;;(e2wm:message "#CURRENT-WINDOW-CONFIGURATION %s" e2wm:override-window-cfg-count)
    (if (e2wm:managed-p)
        (let ((data (e2wm:pst-copy-instance)))
          (setq ad-return-value
                (make-e2wm:$wcfg :wcfg cfg :pst data
                      :count e2wm:override-window-cfg-count))))))

(defadvice window-configuration-p (around e2wm:ad-override-long (cfg))
  (setq ad-return-value (or (e2wm:override-custom-wcfg-p cfg) ad-do-it)))

(defadvice window-configuration-frame (around e2wm:ad-override-long (cfg))
  (when (e2wm:override-custom-wcfg-p cfg)
    (ad-set-arg 0 (e2wm:$wcfg-wcfg cfg)))
  ad-do-it)

(defadvice compare-window-configurations (around e2wm:ad-override-long (cfg1 cfg2))
  (when (e2wm:override-custom-wcfg-p cfg1)
    (ad-set-arg 0 (e2wm:$wcfg-wcfg cfg1)))
  (when (e2wm:override-custom-wcfg-p cfg2)
    (ad-set-arg 1 (e2wm:$wcfg-wcfg cfg2)))
  ad-do-it
  (when (and ad-return-value (e2wm:managed-p))
    (e2wm:message "#COMPARE-WINDOW-CONFIGURATIONS = %s" ad-return-value)
    ;;(e2wm:debug-windows (e2wm:pst-get-wm))
    ))

(defadvice set-window-configuration (around e2wm:ad-override-long (cfg))
  ;;(e2wm:message "#SET-WINDOW-CONFIGURATION -->")
  (cond
   ((e2wm:override-custom-wcfg-p cfg)
    ;;管理対象であればwindowオブジェクトを元に戻す
    (let ((pst-instance (e2wm:$wcfg-pst cfg))
          (count (e2wm:$wcfg-count cfg)))
      (ad-set-arg 0 (e2wm:$wcfg-wcfg cfg))
      (e2wm:message "#SET-WINDOW-CONFIGURATION (ad-do-it)")
      ad-do-it
      ;;(e2wm:debug-windows (e2wm:$pst-wm pst-instance))
      (when e2wm:pst-minor-mode
        (cond
         ((e2wm:managed-p)
          ;;(e2wm:message "#AD-SET-WINDOW-CONFIGURATION SET %s" pst-instance)
          (e2wm:message "#AD-SET-WINDOW-CONFIGURATION SET %s" count)
          (e2wm:pst-set-instance pst-instance))
         (t
          (e2wm:message "#AD-SET-WINDOW-CONFIGURATION RESUME %s" pst-instance)
          (e2wm:pst-set-instance pst-instance)
          (e2wm:pst-resume pst-instance))))))
   (t
    ;;管理してない配置の場合はパースペクティブを無効にする
    (when (and (e2wm:managed-p) (null e2wm:override-window-ext-managed))
      (e2wm:message "#AD-SET-WINDOW-CONFIGURATION FINISH")
      (e2wm:pst-finish)
      (e2wm:pst-set-instance nil))
    ad-do-it))
  ;;(e2wm:message "#SET-WINDOW-CONFIGURATION <-- %s" ad-return-value)
  )


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; ### Plugin Framework

;; e2wm:$plugin構造体
;; name   : プラグインの symbol
;; title  : 人が読む用のプラグインの名前
;; update : プラグイン本体の関数
(cl-defstruct e2wm:$plugin name title update)

(defvar e2wm:plugin-list nil "[internal] Plugin registory.")
(setq e2wm:plugin-list nil)

(defun e2wm:plugin-register (name title update-function)
  ;;プラグインの登録
  (e2wm:plugin-delete name)
  (push (make-e2wm:$plugin
         :name name
         :title title
         :update update-function)
        e2wm:plugin-list))

(defun e2wm:plugin-delete (name)
  ;;プラグインの登録削除
  (e2wm:delete! name e2wm:$plugin-name e2wm:plugin-list))

(defun e2wm:plugin-get (name)
  ;;プラグイン構造体を名前から取ってくる
  (if name
      (e2wm:aif (e2wm:find name 'e2wm:$plugin-name e2wm:plugin-list)
          it (e2wm:message "Plugin not found [%s]." name) nil)))

(defun e2wm:plugin-exec-update (frame wm)
  ;;各windowのプラグインを実行
  (cl-loop for winfo in (wlf:wset-winfo-list wm)
        for plugin-name = (wlf:window-option-get winfo :plugin)
        for plugin = (e2wm:plugin-get plugin-name)
        if (and (wlf:window-live-window winfo) plugin)
        do
        (condition-case err
            (funcall (e2wm:$plugin-update plugin) frame wm winfo)
          (error (e2wm:message "Plugin Error %s [%s]" plugin-name err)))))

(defun e2wm:plugin-exec-update-by-plugin-name (frame wm exec-plugin-name)
  ;;指定のプラグインだけを実行（プラグインから更新のために呼ばれる）
  (cl-loop for winfo in (wlf:wset-winfo-list wm)
        for plugin-name = (wlf:window-option-get winfo :plugin)
        for plugin = (e2wm:plugin-get plugin-name)
        if (and (wlf:window-live-window winfo) plugin
                (eq exec-plugin-name plugin-name))
        do
        (condition-case err
            (funcall (e2wm:$plugin-update plugin) frame wm winfo)
          (error (e2wm:message "Plugin Error %s [%s]" plugin-name err)))))

(defun e2wm:plugin-switch (plugin-name)
  ;;現在選択されているウインドウのプラグインを取り替える
  (let* ((wm (e2wm:pst-get-wm))
         (wname (wlf:get-window-name wm (selected-window)))
         (plugin-symbol (if (symbolp plugin-name)
                            plugin-name
                          (intern plugin-name))))
    (when wname
      (e2wm:pst-window-plugin-set wm wname plugin-symbol)
      (e2wm:pst-update-windows))))

(defun e2wm:plugin-switch-command ()
  (interactive)
  ;;プラグインを選択して取り替える
  (let* ((wm (e2wm:pst-get-wm))
         (wname (wlf:get-window-name wm (selected-window)))
         (cplg (or (if wname
                       (e2wm:pst-window-plugin-get wm wname))
                   "No plugin"))
         (plg-list (mapcar
                    (lambda (i) (symbol-name (e2wm:$plugin-name i)))
                    e2wm:plugin-list))
         (completion-ignore-case t)
         (plg-name (completing-read
                    (format "Chagne plugin [current: %s] -> : " cplg)
                    plg-list)))
    (when plg-name
      (e2wm:plugin-switch plg-name))))

(defun e2wm:plugin-remove-command ()
  (interactive)
  ;;現在選択されているウインドウのプラグインを外す
  (let* ((wm (e2wm:pst-get-wm))
         (wname (wlf:get-window-name wm (selected-window))))
    (when wname
      (e2wm:pst-window-plugin-set wm wname nil)
      (e2wm:pst-update-windows))))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; ### Menu Definition

(defvar e2wm:pst-minor-mode-menu-spec nil)

(defun e2wm:menu-pst-selected-p (name)
  ;;現在のパースペクティブがnameかどうか
  (eq name (e2wm:$pst-name (e2wm:pst-get-instance))))

(defun e2wm:menu-plugin-selected-p (name)
  ;;現在のウインドウのプラグインがnameかどうか
  (let* ((wm (e2wm:pst-get-wm))
         (wname (wlf:get-window-name wm (selected-window))))
    (when wname
      (eq name (e2wm:pst-window-plugin-get wm wname)))))

(defun e2wm:menu-plugin-working-p ()
  ;;現在のウインドウにプラグインがあるかどうか
  (let* ((wm (e2wm:pst-get-wm))
         (wname (wlf:get-window-name wm (selected-window))))
    (e2wm:pst-window-plugin-get wm wname)))

(defun e2wm:menu-define ()
  (let (perspectives plugins)
    (setq perspectives
          (cl-loop for i in e2wm:pst-list
                for n = (e2wm:$pst-class-name i)
                collect
                (vector (e2wm:$pst-class-title i)
                        `(lambda () (interactive) (e2wm:pst-change ',n))
                        :selected `(e2wm:menu-pst-selected-p ',n)
                        :style 'toggle)))
    (setq plugins
          (cl-loop for i in e2wm:plugin-list
                for n = (e2wm:$plugin-name i)
                collect
                (vector (e2wm:$plugin-title i)
                        `(lambda () (interactive) (e2wm:plugin-switch ',n))
                        :selected `(e2wm:menu-plugin-selected-p ',n)
                        :style 'toggle)))

    (setq e2wm:pst-minor-mode-menu-spec
          `("E2wm"
            ["History Forward" e2wm:pst-history-forward-command t]
            ["History Back"    e2wm:pst-history-back-command t]
            ["Update Windows"  e2wm:pst-update-windows-command t]
            "----"
            ["Quit E2wm"  e2wm:stop-management t]
            "----"
            "Perspectives" ,@(nreverse perspectives)
            "----"
            "Plugins" ,@(nreverse plugins)
            ["Remove Current Plugin" e2wm:plugin-remove-command
             (e2wm:menu-plugin-working-p)]
            ))
    (easy-menu-define e2wm-menu-map
      e2wm:pst-minor-mode-keymap "E2wm menu map"
      e2wm:pst-minor-mode-menu-spec)
    ;; (easy-menu-add e2wm-menu-map e2wm:pst-minor-mode-keymap)
    ))

;; (e2wm:menu-define)


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; ### Plugin Definition

(defface e2wm:face-history-list-normal
  '((t :foreground "DarkSlateBlue"))
  "Face for e2wm history list." :group 'e2wm)
(defface e2wm:face-history-list-select1
  '((t :foreground "OrangeRed" :background "Lightsteelblue1"))
  "Face for e2wm history list." :group 'e2wm)
(defface e2wm:face-history-list-select2
  '((t :foreground "Blue" :background "WhiteSmoke"))
  "Face for e2wm history list." :group 'e2wm)

;;; history-list / バッファ・履歴一覧
;;;--------------------------------------------------

(defun e2wm:def-plugin-history-list (frame wm winfo)
  (let ((wname (wlf:window-name winfo))
        (win (wlf:window-live-window winfo))
        (buf (get-buffer " *WM:History*")) current-pos)
    (unless (and buf (buffer-live-p buf))
      (setq buf (get-buffer-create " *WM:History*"))
      (with-current-buffer buf
        (e2wm:def-plugin-history-list-mode)
        (setq buffer-read-only t)
        (setq truncate-lines t)
        (buffer-disable-undo buf)
        (hl-line-mode 1)))
    (with-current-buffer buf
      (let (buffer-read-only)
        (erase-buffer)
        (goto-char (point-min))
        (let ((history (e2wm:history-get))
              (history-backup (reverse (e2wm:history-get-backup)))
              (cnt 1))
          (cl-loop for h in (append history-backup history)
                with main-buf = (e2wm:history-get-main-buffer)
                for name = (if (stringp h) h (buffer-name h))
                do (insert
                    (e2wm:tp
                     (e2wm:rt
                      (format
                       "%3s %s %s\n" cnt name
                       (if (buffer-modified-p h) "*" ""))
                      (if (eql h main-buf) 'e2wm:face-history-list-select1
                        'e2wm:face-history-list-normal))
                     'e2wm:buffer h))
                (cl-incf cnt))
          (goto-line (1+ (length history-backup)))
          (setq current-pos (point))
          (setq mode-line-format
                '("-" mode-line-mule-info
                  " " mode-line-position "-%-"))
          (setq header-line-format
                (format "Buffer History [%i]" (1- cnt))))))
    (wlf:set-buffer wm wname buf)
    (when win (set-window-point win current-pos))))

(defvar e2wm:def-plugin-history-list-mode-map
  (e2wm:define-keymap
   '(("k" . previous-line)
     ("j" . next-line)
     ("d" . e2wm:def-plugin-history-list-kill-command)
     ("<SPC>" . e2wm:def-plugin-history-list-show-command)
     ("C-m"   . e2wm:def-plugin-history-list-select-command)
     ("q"     . e2wm:pst-window-select-main-command)
     )))

(define-derived-mode e2wm:def-plugin-history-list-mode fundamental-mode "History")

(defun e2wm:def-plugin-history-list-kill-command ()
  (interactive)
  (when (e2wm:managed-p)
    (let (buf)
      (save-excursion
        (beginning-of-line)
        (setq buf (get-text-property (point) 'e2wm:buffer)))
      (when (and buf (buffer-live-p buf))
        (kill-buffer buf)))))

(defun e2wm:def-plugin-history-list-forward-command ()
  (interactive)
  (when (e2wm:managed-p)
    (e2wm:pst-history-forward-command)))

(defun e2wm:def-plugin-history-list-back-command ()
  (interactive)
  (when (e2wm:managed-p)
    (e2wm:pst-history-back-command)))

(defun e2wm:def-plugin-history-list-select-command ()
  (interactive)
  (when (e2wm:managed-p)
    (e2wm:def-plugin-history-list-show-command)
    (e2wm:pst-window-select-main)))

(defun e2wm:def-plugin-history-list-show-command ()
  (interactive)
  (when (e2wm:managed-p)
    (let (buf)
      (save-excursion
        (beginning-of-line)
        (setq buf (get-text-property (point) 'e2wm:buffer)))
      (when (and buf (buffer-live-p buf))
        (e2wm:history-add buf)
        (e2wm:pst-show-history-main)))))

(e2wm:plugin-register 'history-list
                     "History List"
                     'e2wm:def-plugin-history-list)

;;; history-list2 / バッファ・履歴一覧 (two専用)
;;;--------------------------------------------------

(defun e2wm:def-plugin-history-list2-get-plugin-buffer (wm)
  ;; pluginがprev-mainかhistory-nthのwindowのバッファを取ってくる
  (cl-loop for winfo in (wlf:wset-winfo-list wm)
        for plugin-name = (wlf:window-option-get winfo :plugin)
        if (and (wlf:window-live-window winfo) plugin-name
                (memq plugin-name '(history-nth main-prev)))
        return (wlf:get-buffer wm (wlf:window-name winfo))))

(defun e2wm:def-plugin-history-list2 (frame wm winfo)
  (let ((wname (wlf:window-name winfo))
        (win (wlf:window-live-window winfo))
        (buf (get-buffer " *WM:History2*")) current-pos)
    (unless (and buf (buffer-live-p buf))
      (setq buf (get-buffer-create " *WM:History2*"))
      (with-current-buffer buf
        (e2wm:def-plugin-history-list2-mode)
        (setq buffer-read-only t)
        (setq truncate-lines t)
        (buffer-disable-undo buf)
        (hl-line-mode 1)))
    (with-current-buffer buf
      (let (buffer-read-only)
        (setq current-pos (point))
        (erase-buffer)
        (goto-char (point-min))
        (let* ((history (e2wm:history-get))
               (history-backup (reverse (e2wm:history-get-backup)))
               (main-buf   (wlf:get-buffer wm 'left))
               (second-buf (wlf:get-buffer wm 'right))
               (cnt 1))
          (cl-loop for h in (append history-backup history)
                for name = (if (stringp h) h (buffer-name h))
                do (insert
                    (e2wm:tp
                     (e2wm:rt
                      (format
                       "%2s%2s %2s %s %s\n"
                       (if (eql h main-buf) "<-" "")
                       (if (eql h second-buf) "->" "")
                       cnt name
                       (if (buffer-modified-p h) "*" ""))
                      (cond
                       ((eql h main-buf) 'e2wm:face-history-list-select1)
                       ((eql h second-buf) 'e2wm:face-history-list-select2)
                       (t
                        'e2wm:face-history-list-normal)))
                     'e2wm:buffer h))
                (cl-incf cnt))
          (goto-char current-pos)
          (setq mode-line-format
                '("-" mode-line-mule-info
                  " " mode-line-position "-%-"))
          (setq header-line-format
                (format "Buffer History [%i]" (1- cnt))))))
    (wlf:set-buffer wm wname buf)
    (when win (set-window-point win current-pos))))

(defvar e2wm:def-plugin-history-list2-mode-map
  (e2wm:define-keymap
   '(
     ("p" . previous-line)
     ("n" . next-line)
     ("k" . previous-line)
     ("j" . next-line)

     ("h"       . e2wm:def-plugin-history-list2-show-left-command)
     ("b"       . e2wm:def-plugin-history-list2-show-left-command)
     ("C-b"     . e2wm:def-plugin-history-list2-show-left-command)
     ("<left>"  . e2wm:def-plugin-history-list2-show-left-command)
     ("<SPC>"   . e2wm:def-plugin-history-list2-show-left-command)

     ("l"       . e2wm:def-plugin-history-list2-show-right-command)
     ("f"       . e2wm:def-plugin-history-list2-show-right-command)
     ("C-f"     . e2wm:def-plugin-history-list2-show-right-command)
     ("<right>" . e2wm:def-plugin-history-list2-show-right-command)

     ("d"       . e2wm:def-plugin-history-list-kill-command)
     ("C-m"     . e2wm:def-plugin-history-list2-select-command)
     ("q"       . e2wm:pst-window-select-main-command)
     )))

(define-derived-mode e2wm:def-plugin-history-list2-mode fundamental-mode "History")

(defun e2wm:def-plugin-history-list2-show-right-command ()
  (interactive)
  (when (e2wm:managed-p)
    (let (buf)
      (save-excursion
        (beginning-of-line)
        (setq buf (get-text-property (point) 'e2wm:buffer)))
      (when (and buf (buffer-live-p buf))
        (e2wm:pst-buffer-set 'right buf)
        (e2wm:plugin-exec-update-by-plugin-name
         (selected-frame) (e2wm:pst-get-wm) 'history-list2)))))

(defun e2wm:def-plugin-history-list2-show-left-command ()
  (interactive)
  (when (e2wm:managed-p)
    (let (buf)
      (save-excursion
        (beginning-of-line)
        (setq buf (get-text-property (point) 'e2wm:buffer)))
      (when (and buf (buffer-live-p buf))
        (cond
         ((eql buf (e2wm:pst-buffer-get 'left))
          (e2wm:pst-buffer-set 'right buf))
         (t
          (e2wm:pst-buffer-set 'left buf)))
        (e2wm:plugin-exec-update-by-plugin-name
         (selected-frame) (e2wm:pst-get-wm) 'history-list2)))))

(defun e2wm:def-plugin-history-list2-select-command ()
  (interactive)
  (when (e2wm:managed-p)
    (e2wm:def-plugin-history-list2-show-left-command)
    (e2wm:pst-window-select-main)))

(e2wm:plugin-register 'history-list2
                     "History List (two)"
                     'e2wm:def-plugin-history-list2)

;;; dired / メインバッファの位置のファイル一覧
;;;--------------------------------------------------

;; 一番簡単なプラグイン
;; diredに丸投げ

(defun e2wm:def-plugin-dired (frame wm winfo)
  (let* ((buf (e2wm:history-get-main-buffer))
         (dir (with-current-buffer buf
                (or default-directory ".")))
         (dbuf (dired-noselect dir)))
    (with-current-buffer dbuf (revert-buffer))
    (wlf:set-buffer wm (wlf:window-name winfo) dbuf)))

(e2wm:plugin-register 'dired
                     "Dired"
                     'e2wm:def-plugin-dired)

;;; imenu / Imenuで概要参照
;;;--------------------------------------------------

(defvar e2wm:def-plugin-imenu-cached-entries nil)
(make-variable-buffer-local 'e2wm:def-plugin-imenu-cached-entries)
(defvar e2wm:def-plugin-imenu-cached-tick nil)
(make-variable-buffer-local 'e2wm:def-plugin-imenu-cached-tick)

(defun e2wm:def-plugin-imenu (frame wm winfo)
  (let ((entries (e2wm:def-plugin-imenu-entries))
        (wname (wlf:window-name winfo))
        (buf (wlf:window-option-get winfo :buffer)) pos)
    (unless (and buf (buffer-live-p buf))
      (setq buf (get-buffer-create " *WM:Imenu*"))
      (with-current-buffer buf
        (e2wm:def-plugin-imenu-mode)
        (setq buffer-read-only t)
        (setq truncate-lines t)
        (buffer-disable-undo buf)
        (hl-line-mode 1))
      (e2wm:def-plugin-imenu-start-timer))
    (with-current-buffer buf
      (let (buffer-read-only)
        (setq pos (point))
        (erase-buffer)
        (cl-loop for i in entries
              do (insert i "\n"))
        (setq mode-line-format
              '("-" mode-line-mule-info
                " " mode-line-position "-%-"))
        (setq header-line-format
              (format "Imenu entries [%i]" (length entries)))
        (goto-char pos)
        (hl-line-highlight)))
    (wlf:set-buffer wm wname buf)
    (set-window-point (wlf:get-window wm wname) pos)))

(defun e2wm:def-plugin-imenu-entries ()
  "[internal] Return a list of imenu items to insert the imenu buffer."
  (let ((buf (e2wm:history-get-main-buffer)))
    (when (buffer-live-p buf)
      (with-current-buffer buf
        (let ((tick (buffer-modified-tick)))
          (if (and (eq e2wm:def-plugin-imenu-cached-tick tick)
                   e2wm:def-plugin-imenu-cached-entries)
              e2wm:def-plugin-imenu-cached-entries
            (setq imenu--index-alist nil)
            (setq e2wm:def-plugin-imenu-cached-tick tick
                  e2wm:def-plugin-imenu-cached-entries
                  (condition-case nil
                      (nreverse
                       (e2wm:def-plugin-imenu-create-entries
                        (imenu--make-index-alist) "" nil))
                    (error nil)))))))))

(defun e2wm:def-plugin-imenu-create-entries (entries indent result)
  "[internal] Make a menu item from the imenu object and return a
string object to insert the imenu buffer."
  (cl-loop for i in entries do
        (cond
         ;; item
         ((number-or-marker-p (cdr i))
          (let ((title (concat indent (car i)))
                (mark (cdr i)))
            (push (propertize title 'e2wm:imenu-mark mark) result)))
         ;; overlay
         ((overlayp (cdr i))
          (let ((title (concat indent (car i)))
                (mark (overlay-start (cdr i))))
            (push (propertize title 'e2wm:imenu-mark mark) result)))
         ;; cascade
         ((listp (cdr i))
          ;; title
          (push (e2wm:rt (concat indent (car i)) 'e2wm:face-subtitle) result)
          ;; contents
          (setq result
                (e2wm:def-plugin-imenu-create-entries
                 (cdr i) (concat "  " indent) result)))
         ;; ?
         (t nil)))
  result)

(setq imenu-default-goto-function 'imenu-default-goto-function)

(defun e2wm:def-plugin-imenu-jump (elm)
  "[internal] Jump to the selected imenu item."
  (let ((mark (get-text-property 0 'e2wm:imenu-mark elm)))
    (when mark
      (push-mark)
      (imenu-default-goto-function elm mark))))

(defun e2wm:def-plugin-imenu-jump-command ()
  "Jump to the selected imenu item on the main window."
  (interactive)
  (let ((elm (e2wm:string-trim (thing-at-point 'line))))
    (select-window (get-buffer-window (e2wm:history-get-main-buffer)))
    (e2wm:def-plugin-imenu-jump elm)))

(defun e2wm:def-plugin-imenu-show-command ()
  "Show the selected imenu item on the main window."
  (interactive)
  (let ((elm (e2wm:string-trim (thing-at-point 'line)))
        (cwin (selected-window)))
    (select-window (get-buffer-window (e2wm:history-get-main-buffer)))
    (e2wm:def-plugin-imenu-jump elm)
    (select-window cwin)))

(defvar e2wm:def-plugin-imenu-mode-map
  (e2wm:define-keymap
   '(("C-m" . e2wm:def-plugin-imenu-jump-command)
     ("j" . next-line)
     ("k" . previous-line)
     ("n" . next-line)
     ("p" . previous-line)
     ("u" . scroll-down)
     ("e" . scroll-down)
     ("d" . scroll-up)
     ("v" . scroll-up)
     ("q" . e2wm:pst-window-select-main-command)
     ("<SPC>" . e2wm:def-plugin-imenu-show-command)
     )))

(define-derived-mode e2wm:def-plugin-imenu-mode fundamental-mode "Imenu")

(defun e2wm:def-plugin-imenu-which-func ()
  (cl-loop with which-func = nil
        with minoffset = (point-max)
        for i in e2wm:def-plugin-imenu-cached-entries
        for mark = (get-text-property 0 'e2wm:imenu-mark i)
        if (or (and (markerp mark) (marker-position mark))
               (numberp mark))
        do (let ((offset (- (point) mark)))
             (if (>= offset 0)
                 (when (< offset minoffset)
                   (setq which-func i
                         minoffset offset))))
        finally return which-func))

(defvar e2wm:def-plugin-imenu-timer nil)

(defun e2wm:def-plugin-imenu-start-timer ()
  (interactive)
  (unless e2wm:def-plugin-imenu-timer
    (setq e2wm:def-plugin-imenu-timer
          (run-with-idle-timer
           idle-update-delay t
           'e2wm:def-plugin-imenu-update-which-func))
    (e2wm:message "Imenu timer started.")))

(defun e2wm:def-plugin-imenu-stop-timer ()
  (interactive)
  (when (timerp e2wm:def-plugin-imenu-timer)
    (cancel-timer e2wm:def-plugin-imenu-timer))
  (setq e2wm:def-plugin-imenu-timer nil)
  (e2wm:message "Imenu timer stopped."))

(defun e2wm:def-plugin-imenu-update-which-func ()
  (e2wm:with-advice
   (let* ((main-buf (e2wm:history-get-main-buffer))
          (win (selected-window))
          (imenu-buf (get-buffer " *WM:Imenu*"))
          (imenu-win (and imenu-buf (get-buffer-window imenu-buf))))
     (cond
      ((null imenu-buf)
       (e2wm:def-plugin-imenu-stop-timer))
      ((eql win (get-buffer-window main-buf))
       (let ((name (e2wm:def-plugin-imenu-which-func)))
         (when (and name (window-live-p imenu-win))
           (with-current-buffer imenu-buf
             (goto-char (point-min))
             (let ((ps (re-search-forward (concat "^" (regexp-quote name) "$"))))
               (when ps
                 (beginning-of-line)
                 (set-window-point imenu-win (point))
                 (hl-line-highlight)))))))
      (t
       ;;can not update
       )))))

(e2wm:plugin-register 'imenu
                     "Outline"
                     'e2wm:def-plugin-imenu)

;;; top / topでマシン状態表示
;;;--------------------------------------------------

;; 自動更新のデモ

(defvar e2wm:def-plugin-top-buffer-name " *WM:Top*" "[internal use]")
(defvar e2wm:def-plugin-top-timer-handle nil "[internal use]")
(defvar e2wm:def-plugin-top-timer-interval 20 "Seconds for update.")

(defun e2wm:def-plugin-top (frame wm winfo)
  ;;bufferが生きていればバッファを表示するだけ（タイマーに任せる）
  ;;bufferが無ければ初回更新してタイマー開始する
  (let ((buf (get-buffer e2wm:def-plugin-top-buffer-name)))
    (unless (and buf (buffer-live-p buf))
      (setq buf (e2wm:def-plugin-top-update)))
    (unless e2wm:def-plugin-top-timer-handle
      (setq e2wm:def-plugin-top-timer-handle
            (run-at-time
             e2wm:def-plugin-top-timer-interval
             e2wm:def-plugin-top-timer-interval
             'e2wm:def-plugin-top-timer))
      (e2wm:message "WM: 'top' update timer started."))
    (wlf:set-buffer wm (wlf:window-name winfo) buf)))

(defun e2wm:def-plugin-top-timer ()
  ;;bufferが死んでいれば、タイマー停止
  ;;bufferが生きていれば更新実行
  (let ((buf (get-buffer e2wm:def-plugin-top-buffer-name)))
    (if (and (e2wm:managed-p) buf (buffer-live-p buf)
             (get-buffer-window buf))
        (when (= 0 (minibuffer-depth))
          (e2wm:def-plugin-top-update))
      (when e2wm:def-plugin-top-timer-handle
          (cancel-timer e2wm:def-plugin-top-timer-handle)
          (setq e2wm:def-plugin-top-timer-handle nil)
          (e2wm:message "WM: 'top' update timer stopped.")))))

(defun e2wm:def-plugin-top-update ()
  (let* ((buf (get-buffer e2wm:def-plugin-top-buffer-name))
                 (tmpbuf (get-buffer-create " *WM:Top-temp*"))
                 (cleanup (lambda() (kill-buffer tmpbuf))))
    (buffer-disable-undo tmpbuf)
    (unless (and buf (buffer-live-p buf))
      (setq buf (get-buffer-create e2wm:def-plugin-top-buffer-name))
      (with-current-buffer buf
        (buffer-disable-undo buf)))
    (let (proc)
      (condition-case err
          (setq proc (start-process "WM:top" tmpbuf "top" "-b" "-n" "1"))
        (error
         (with-current-buffer buf
           (erase-buffer)
           (insert (error-message-string err))
           (funcall cleanup))))
      (when proc
        (set-process-sentinel
         proc (lambda(proc event)
                (with-current-buffer buf
                  (erase-buffer)
                  (if (equal event "finished\n")
                      (insert-buffer-substring tmpbuf)
                    (insert "Error: Can not use top output.\n"
                            (format "%s" event)))
                  (goto-char (point-min))
                  (funcall cleanup))
                ))))
    buf))

(e2wm:plugin-register 'top
                     "Top (System Stat)"
                     'e2wm:def-plugin-top)

;;; history-nth / 履歴のN番目を表示
;;;--------------------------------------------------

;; 順番については以下のようにオプションで指定
;; 1でメインと同じ。2で1つ前（デフォルト）。
;; 例 (:name window-name :plugin history-nth :plugin-args 2)

(defun e2wm:def-plugin-history-nth (frame wm winfo)
  (let* ((index (1- (or (wlf:window-option-get winfo :plugin-args) 2)))
         (buf (or (nth index (e2wm:history-get))
                  (e2wm:history-get-main-buffer))))
    (when buf
      (wlf:set-buffer wm (wlf:window-name winfo) buf))))

(e2wm:plugin-register 'history-nth
                     "History Back Buffer"
                     'e2wm:def-plugin-history-nth)

;;; main-prev / ひとつ前にメインに表示していたバッファを表示
;;;--------------------------------------------------

;; history-nthのとの違いは、undoキューがあればそっちの頭を表示する。

(defun e2wm:def-plugin-main-prev (frame wm winfo)
  (let* ((buf (or (car (e2wm:history-get-backup))
                  (nth 1 (e2wm:history-get))
                  (e2wm:history-get-main-buffer))))
    (when buf
      (wlf:set-buffer wm (wlf:window-name winfo) buf))))

(e2wm:plugin-register 'main-prev
                     "Previous Buffer"
                     'e2wm:def-plugin-main-prev)

;;; clock / 時計
;;;--------------------------------------------------

(defvar e2wm:def-plugin-clock-timer-interval 60 "Seconds for update.")
(defvar e2wm:def-plugin-clock-text nil)
(defvar e2wm:def-plugin-clock-url "http://www.bijint.com/jp/img/clk/%H%M.jpg" "URL pattern.")
(defvar e2wm:def-plugin-clock-referer "http://www.bijint.com/jp/" "referer URL")

(defvar e2wm:def-plugin-clock-buffer-name " *WM:Clock*" "[internal use]")
(defvar e2wm:def-plugin-clock-timer-handle nil "[internal use]")
(defvar e2wm:def-plugin-clock-window nil "[internal use] Display window.") ; 表示するウインドウは1つであることを仮定（サイズ取得のため）
(defvar e2wm:def-plugin-clock-download-file "/tmp/wmclock.jpg"  "[internal]")
(defvar e2wm:def-plugin-clock-resized-file  "/tmp/wmclockt.jpg" "[internal]")
;;↑cygwin環境の場合は "C:/cygwin/tmp/wmclock.jpg" とかにすると良いかも

(defun e2wm:def-plugin-clock (frame wm winfo)
  ;;bufferが生きていればバッファを表示するだけ（タイマーに任せる）
  ;;bufferが無ければ初回更新してタイマー開始する
  (let ((buf (get-buffer e2wm:def-plugin-clock-buffer-name)))
    (setq e2wm:def-plugin-clock-window
          (wlf:get-window wm (wlf:window-name winfo)))
    (unless (and buf (buffer-live-p buf))
      (setq buf (e2wm:def-plugin-clock-update)))
    (unless e2wm:def-plugin-clock-timer-handle
      (setq e2wm:def-plugin-clock-timer-handle
            (run-at-time
             t
             e2wm:def-plugin-clock-timer-interval
             'e2wm:def-plugin-clock-timer))
      (e2wm:message "WM: 'clock' update timer started."))
    (wlf:set-buffer wm (wlf:window-name winfo) buf)))

(defun e2wm:def-plugin-clock-timer ()
  ;;bufferが死んでいれば、タイマー停止
  ;;bufferが生きていれば更新実行
  (let ((buf (get-buffer e2wm:def-plugin-clock-buffer-name)))
    (if (and (e2wm:managed-p) buf (buffer-live-p buf)
             (get-buffer-window buf))
        (when (= 0 (minibuffer-depth))
          (e2wm:def-plugin-clock-update))
      (when e2wm:def-plugin-clock-timer-handle
          (cancel-timer e2wm:def-plugin-clock-timer-handle)
          (setq e2wm:def-plugin-clock-timer-handle nil)
          (when buf (kill-buffer buf))
          (e2wm:message "WM: 'clock' update timer stopped.")))))

(defun e2wm:def-plugin-clock-update ()
  (let ((buf (get-buffer e2wm:def-plugin-clock-buffer-name)))
    (unless (and buf (buffer-live-p buf))
      (setq buf (get-buffer-create e2wm:def-plugin-clock-buffer-name))
      (with-current-buffer buf
        (buffer-disable-undo buf)
        (setq mode-line-format
              '("-" mode-line-mule-info
                " E2wm Clock -%-"))))
    (if e2wm:def-plugin-clock-text
        (e2wm:def-plugin-clock-show-text "Text mode")
      (e2wm:def-plugin-clock-download))
    buf))

(defun e2wm:def-plugin-clock-download ()
  (let ((tmpbuf (get-buffer-create " *WM:Clock-temp*")))
    (buffer-disable-undo tmpbuf)
    (let* ((url (format-time-string
                 e2wm:def-plugin-clock-url
                  (current-time)))
           (proc (start-process
                  "WM:clockw" tmpbuf "wget"
                  (concat "--referer=" e2wm:def-plugin-clock-referer)
                  "-q" "-O" e2wm:def-plugin-clock-download-file url)))
      (set-process-sentinel
       proc (lambda(proc event)
              (cond
               ((string-match "exited abnormally" event)
                (kill-buffer tmpbuf)
                (e2wm:def-plugin-clock-show-text "No network connection."))
               ((equal event "finished\n")
                (kill-buffer tmpbuf)
                (let ((f e2wm:def-plugin-clock-download-file))
                  (if (and (file-exists-p f)
                           (< 0 (nth 7 (file-attributes f))))
                      (e2wm:def-plugin-clock-resize)
                    (e2wm:def-plugin-clock-show-text "No network connection."))))))))))

(defun e2wm:def-plugin-clock-resize ()
  (let*
      ((tmpbuf (get-buffer-create " *WM:Clock-temp*"))
       (window e2wm:def-plugin-clock-window)
       (w (* (window-width window) (frame-char-width)))
       (h (* (- (window-height window) 1) (frame-char-height)))
       (proc
        (start-process "WM:clockc" tmpbuf "convert"
                       "-resize"
                       (format "%ix%i" w h)
                       e2wm:def-plugin-clock-download-file
                       (concat "jpeg:" e2wm:def-plugin-clock-resized-file))))
    (set-process-sentinel
     proc (lambda (proc event)
            (cond
               ((string-match "exited abnormally" event)
                (kill-buffer tmpbuf)
                (e2wm:def-plugin-clock-show-text "Could not convert."))
               ((equal event "finished\n")
                (kill-buffer tmpbuf)
                (let ((f e2wm:def-plugin-clock-resized-file))
                  (if (and (file-exists-p f)
                           (< 0 (nth 7 (file-attributes f))))
                      (e2wm:def-plugin-clock-show-image)
                    (e2wm:def-plugin-clock-show-text "Could not convert."))))
              )))))

(defun e2wm:def-plugin-clock-show-image ()
  (clear-image-cache)
  (let ((buf (get-buffer e2wm:def-plugin-clock-buffer-name))
        (img (create-image e2wm:def-plugin-clock-resized-file 'jpeg))
        (map (make-sparse-keymap)))
    (define-key map [mouse-1] 'e2wm:def-plugin-clock-onclick)
    (with-current-buffer buf
      (erase-buffer)
      (goto-char (point-min))
      (insert "clock image")
      (add-text-properties
       (point-min) (point-max)
       (list 'display img 'keymap map 'mouse-face 'highlight)))))

(defun e2wm:def-plugin-clock-onclick ()
  (interactive)
  (browse-url e2wm:def-plugin-clock-referer))

(defun e2wm:def-plugin-clock-show-text (&optional text)
  (let ((buf (get-buffer e2wm:def-plugin-clock-buffer-name))
        (time (current-time)))
    (with-current-buffer buf
      (erase-buffer)
      (goto-char (point-min))
      (when text
        (insert
         (e2wm:rt-format "Status: %s\n" text)))
      (insert
       (e2wm:rt-format
        "\nSystem: %s\nLoad Average: %s\n\n"
        (system-name)
        (mapconcat 'identity (cl-loop for i in (load-average t)
                                   collect (format "%.2f" i)) ", ")))
      (insert
       (e2wm:rt-format
        "Date: %s\nTime: %s\n"
        (format-time-string "%Y/%m/%d" time)
        (cons (format-time-string "%H:%M" time) 'e2wm:face-title)))
    )))

(e2wm:plugin-register 'clock
                     "Fancy Clock"
                     'e2wm:def-plugin-clock)

;;; files / シンプルなファイル一覧
;;;--------------------------------------------------
;; 例 (:name window-name :plugin files) ;デフォルト
;;    (:name window-name :plugin files
;;     :plugin-args (:sort time :show-hidden t)) ; 設定付き
;; buffer-local : e2wm:def-plugin-files-dir
;;                e2wm:def-plugin-files-sort-key
;;                e2wm:def-plugin-files-hide-hidden-files

(defvar e2wm:def-plugin-files-dir nil "[internal buffer local]")
(defvar e2wm:def-plugin-files-sort-key nil "[internal buffer local]")
(defvar e2wm:def-plugin-files-hide-hidden-files nil "[internal buffer local]")

(defun e2wm:def-plugin-files (frame wm winfo)
  (let* ((buf (e2wm:history-get-main-buffer))
         (wname (wlf:window-name winfo))
         (opts (wlf:window-option-get winfo :plugin-args))
         (opt-sort-key (or (plist-get opts ':sort) 'name))
         (opt-hide-hidden (not (plist-get opts ':show-hidden)))
         (dir (with-current-buffer buf
                (or default-directory ".")))
         (buf-name (format " *WM:Files-%s*" wname))
         (dbuf (get-buffer buf-name)) pos)
    (unless (and dbuf (buffer-live-p dbuf))
      (setq dbuf (get-buffer-create buf-name))
      (with-current-buffer dbuf
        (e2wm:def-plugin-files-mode)
        (set (make-local-variable 'e2wm:def-plugin-files-dir) dir)
        (set (make-local-variable 'e2wm:def-plugin-files-sort-key) opt-sort-key)
        (set (make-local-variable 'e2wm:def-plugin-files-hide-hidden-files) opt-hide-hidden)
        (setq buffer-read-only t)
        (setq truncate-lines t)
        (buffer-disable-undo dbuf)
        (setq pos (point-min))
        (hl-line-mode 1)))
    (with-current-buffer dbuf
      (let (buffer-read-only)
        (setq pos
              (if (and e2wm:def-plugin-files-dir
                       (equal e2wm:def-plugin-files-dir dir))
                  (point) (point-min)))
        (setq e2wm:def-plugin-files-dir dir)
        (erase-buffer)
        (e2wm:def-plugin-files-update-buffer dir)
        (goto-char pos)))
    (wlf:set-buffer wm wname dbuf)))

(e2wm:plugin-register 'files
                     "Files"
                     'e2wm:def-plugin-files)

(defface e2wm:face-files-main
  '((t (:inherit font-lock-constant-face)))
  "Face used for main info."
  :group 'e2wm-files)
(defface e2wm:face-files-symlink
  '((t (:inherit font-lock-keyword-face)))
  "Face used for symbolic links."
  :group 'e2wm-files)
(defface e2wm:face-files-directory
  '((t (:inherit font-lock-function-name-face)))
  "Face used for subdirectories."
  :group 'e2wm-files)
(defface e2wm:face-files-shadow
  '((t (:inherit shadow)))
  "Face used for shadowed info."
  :group 'e2wm-files)

(defun e2wm:def-plugin-files-update-by-command()
  (interactive)
  ;;カレントバッファが対象のバッファである前提
  (when (eq major-mode 'e2wm:def-plugin-files-mode)
    (let (buffer-read-only)
      (erase-buffer)
      (e2wm:def-plugin-files-update-buffer e2wm:def-plugin-files-dir)
      (goto-char (point-min)))))

(defun e2wm:def-plugin-files-sort (records order)
  (let*
      ((comparator
        (lambda (ref)
          (let ((ref ref))
            (lambda (i j)
              (let ((ii (nth ref i))
                    (jj (nth ref j)))
                (cond
                 ((string= ii jj) 0)
                 ((string< ii jj) -1)
                 (t 1)))))))
       (negative-comparator
        (lambda (ref)
          (let ((ref ref))
            (lambda (i j)
              (let ((ii (nth ref i))
                    (jj (nth ref j)))
                (cond
                 ((string= ii jj) 0)
                 ((string< ii jj) 1)
                 (t -1)))))))
       (to-bool
        (lambda (f)
          (let ((f f))
            (lambda (i j)
              (< (funcall f i j) 0)))))
       (cmp-name (funcall comparator 0))
       (cmp-dir  (funcall comparator 4))
       (cmp-time (funcall negative-comparator 2))
       (cmp-size (funcall negative-comparator 5))
       (chain
        (lambda (a b)
          (let ((a a) (b b))
            (lambda (i j)
              (let ((v (funcall a i j)))
                (if (= 0 v)
                    (funcall b i j)
                  v)))))))
    (nreverse (sort
               records
               (cond
                ((eq order 'name) ; name -> dir, name
                 (funcall to-bool (funcall chain cmp-dir cmp-name)))
                ((eq order 'time) ; time -> dir, time
                 (funcall to-bool cmp-time))
                ((eq order 'size) ; size -> dir, size
                 (funcall to-bool (funcall chain cmp-dir cmp-size)))
                (t  ; default
                 (funcall to-bool (funcall chain cmp-dir cmp-name))))))))

(defun e2wm:def-plugin-files-update-buffer (dir)
  (let* ((files
          (e2wm:def-plugin-files-sort
           (cl-loop
            for f in (directory-files-and-attributes dir)
            for fn = (car f)
            unless (or (member fn '(".." "."))
                       (and e2wm:def-plugin-files-hide-hidden-files
                            (eq (aref fn 0) ?.)))
            collect (list
                     ;; 0:name, 1:dirp, 2:time, 3:size
                     ;; 4:dirp-str, 5:size-str, 6:float-time
                     fn (cadr f)
                     (format-time-string "%Y/%m/%d %H:%M:%S" (nth 7 f))
                     (nth 8 f)
                     (if (cadr f) "d" "f")
                     (if (nth 8 f) (format "%014d" (nth 8 f)) (make-string 14 ?\ ))
                     (float-time (nth 7 f))))
           e2wm:def-plugin-files-sort-key)) rows-file rows-time rows-size rows)
    (cl-loop for i in files
          for fn = (substring (car i) 0)
          for tm = (nth 2 i) for sz = (nth 3 i)
          for type = (cadr i)
          do
          (push i rows)
          (push
           (e2wm:tp
            (cond
             ((stringp type) (e2wm:rt fn 'e2wm:face-files-symlink))
             (type (e2wm:rt fn 'e2wm:face-files-directory))
             (t fn))
            'e2wm:file
            (expand-file-name fn dir)) rows-file)
          (push (nth 2 i) rows-time)
          (push (e2wm:format-byte-unit (nth 3 i)) rows-size))
    (cond
     ((eq e2wm:def-plugin-files-sort-key 'name)
      (e2wm:def-plugin-files-insert-by-name rows-file rows-time rows-size))
     ((eq e2wm:def-plugin-files-sort-key 'time)
      (e2wm:def-plugin-files-insert-by-time rows-file rows-time rows-size rows))
     ((eq e2wm:def-plugin-files-sort-key 'size)
      (e2wm:def-plugin-files-insert-by-size rows-file rows-time rows-size)))
    (setq mode-line-format
          '("-" mode-line-mule-info
            " " mode-line-position "-%-"))
    (let* ((win (get-buffer-window (current-buffer)))
           (width (- (or (and win (window-width win)) 90) 7)) ; 9 <= num and ellipse "..."
           (dirname (expand-file-name dir))
           (namelen (string-width dirname))
           (startcol (max 0 (- namelen width))))
      (setq header-line-format
            (format "[%2i] %s%s"
                    (length files) (if (< 0 startcol) "..." "")
                    (truncate-string-to-width dirname namelen startcol))))))

(defun e2wm:def-plugin-files-insert-by-name (rows-file rows-time rows-size)
  (cl-loop for i from 0 below (length rows-file)
        with wfile = (e2wm:max-length rows-file)
        with wtime = (e2wm:max-length rows-time)
        with fmt = (format "%%-%is  %%%is  %%s\n" wfile wtime)
        for fn = (pop rows-file)
        for tm = (e2wm:rt (pop rows-time) 'e2wm:face-files-shadow)
        for sz = (e2wm:rt (pop rows-size) 'e2wm:face-files-shadow)
        do
        (insert
         (format fmt fn tm sz))))

(defun e2wm:def-plugin-files-insert-by-time (rows-file rows-time rows-size rows)
  (let* ((today (apply 'encode-time
                       (append '(0 0 0)
                               (cdddr (decode-time
                                       (current-time))))))
         (ftoday  (float-time today))
         (fyesterday  (- ftoday 86400))
         (flast-week  (- ftoday (* 86400 7)))
         (flast-month (- ftoday (* 86400 30))))
    (cl-loop for i from 0 below (length rows-file)
          with wfile = (e2wm:max-length rows-file)
          with wtime = (e2wm:max-length rows-time)
          with today-first = nil
          with last-ftime = (float-time (current-time))
          with fmt = (format "%%-%is  %%%is  %%s\n" wfile wtime)
          with spc = (make-string 10 ?-)
          for fn = (pop rows-file)
          for tm = (e2wm:rt (pop rows-time) 'e2wm:face-files-main)
          for sz = (e2wm:rt (pop rows-size) 'e2wm:face-files-shadow)
          for ftm = (nth 6 (pop rows))
          for splitter =
          (cond
           ((and (> last-ftime flast-month) (> flast-month ftm))
            "More")
           ((and (> last-ftime flast-week) (> flast-week ftm))
            "One Month")
           ((and (> last-ftime fyesterday) (> fyesterday ftm))
            "Last Week")
           ((and (> last-ftime ftoday) (> ftoday ftm))
            "Yesterday")
           ((and (null today-first) (< ftoday ftm))
            (setq today-first t)
            "Today")
           (t nil))
          do
          (when splitter
            (insert (e2wm:rt (concat spc (format "- %s ---------\n" splitter))
                            'e2wm:face-files-shadow)))
          (insert
           (format fmt fn tm sz))
          (setq last-ftime ftm))))

(defun e2wm:def-plugin-files-insert-by-size (rows-file rows-time rows-size)
  (cl-loop for i from 0 below (length rows-file)
        with wfile = (e2wm:max-length rows-file)
        with wsize = (e2wm:max-length rows-size)
        with fmt = (format "%%%is  %%-%is  %%s\n" wsize wfile)
        for fn = (pop rows-file)
        for tm = (e2wm:rt (pop rows-time) 'e2wm:face-files-shadow)
        for sz = (e2wm:rt (pop rows-size) 'e2wm:face-files-main)
        do
        (insert
         (format fmt sz fn tm))))

(defun e2wm:def-plugin-files-get-file ()
  (save-excursion
    (beginning-of-line)
    (get-text-property (point) 'e2wm:file)))

(defun e2wm:def-plugin-files-mkdir-command ()
  (interactive)
  (let ((dir
         (read-file-name "mkdir: " e2wm:def-plugin-files-dir)))
    (make-directory dir)
    (e2wm:def-plugin-files-update-by-command)))
(defun e2wm:def-plugin-files-delete-command ()
  (interactive)
  (let ((file (e2wm:def-plugin-files-get-file)))
    (when (yes-or-no-p (format "Delete [%s] ? " file))
      (cond
       ((file-directory-p file)
        (delete-directory file))
       (t
        (delete-file file)))
      (e2wm:def-plugin-files-update-by-command))))
(defun e2wm:def-plugin-files-updir-command ()
  (interactive)
  (when (eq major-mode 'e2wm:def-plugin-files-mode)
    (setq e2wm:def-plugin-files-dir
          (expand-file-name ".." e2wm:def-plugin-files-dir))
    (e2wm:def-plugin-files-update-by-command)))
(defun e2wm:def-plugin-files-rename-command ()
  (interactive)
  (let ((file (e2wm:def-plugin-files-get-file)))
    (e2wm:aif
        (read-file-name (format "Rename [%s] to: " file) e2wm:def-plugin-files-dir)
        (progn
          (rename-file file it)
          (e2wm:def-plugin-files-update-by-command)))))
(defun e2wm:def-plugin-files-sort-size-command ()
  (interactive)
  (when (eq major-mode 'e2wm:def-plugin-files-mode)
    (setq e2wm:def-plugin-files-sort-key 'size)
    (e2wm:def-plugin-files-update-by-command)))
(defun e2wm:def-plugin-files-sort-time-command ()
  (interactive)
  (when (eq major-mode 'e2wm:def-plugin-files-mode)
    (setq e2wm:def-plugin-files-sort-key 'time)
    (e2wm:def-plugin-files-update-by-command)))
(defun e2wm:def-plugin-files-sort-name-command ()
  (interactive)
  (when (eq major-mode 'e2wm:def-plugin-files-mode)
    (setq e2wm:def-plugin-files-sort-key 'name)
    (e2wm:def-plugin-files-update-by-command)))
(defun e2wm:def-plugin-files-show-command ()
  (interactive)
  (let ((cwin (selected-window)))
    (e2wm:def-plugin-files-select-command)
    (select-window cwin)))
(defun e2wm:def-plugin-files-select-command ()
  (interactive)
  (let ((file (e2wm:def-plugin-files-get-file)))
    (cond
     ((file-directory-p file)
      (setq e2wm:def-plugin-files-dir file)
      (e2wm:def-plugin-files-update-by-command))
     (t
      (e2wm:history-add (find-file-noselect file))
      (e2wm:pst-show-history-main)
      (e2wm:pst-window-select-main)))))
(defun e2wm:def-plugin-files-toggle-hidden-files-command ()
  (interactive)
  (when (eq major-mode 'e2wm:def-plugin-files-mode)
    (setq e2wm:def-plugin-files-hide-hidden-files
          (not e2wm:def-plugin-files-hide-hidden-files))
    (e2wm:def-plugin-files-update-by-command)))
(defun e2wm:def-plugin-files-open-dired-command ()
  (interactive)
  (dired e2wm:def-plugin-files-dir))

(defvar e2wm:def-plugin-files-mode-map
  (e2wm:define-keymap
   '(
     ("k" . previous-line)
     ("j" . next-line)
     ("p" . previous-line)
     ("n" . next-line)
     ("D" . e2wm:def-plugin-files-open-dired-command)
     ("h" . e2wm:def-plugin-files-toggle-hidden-files-command)
     ("+" . e2wm:def-plugin-files-mkdir-command)
     ("g" . e2wm:def-plugin-files-update-by-command)
     ("d" . e2wm:def-plugin-files-delete-command)
     ("^" . e2wm:def-plugin-files-updir-command)
     ("r" . e2wm:def-plugin-files-rename-command)
     ("t" . e2wm:def-plugin-files-sort-time-command)
     ("s" . e2wm:def-plugin-files-sort-name-command)
     ("z" . e2wm:def-plugin-files-sort-size-command)
     ("q" . e2wm:pst-window-select-main-command)
     ("<SPC>" . e2wm:def-plugin-files-show-command)
     ("C-m"   . e2wm:def-plugin-files-select-command)
     )))

(define-derived-mode e2wm:def-plugin-files-mode fundamental-mode "Files")

;;; open / バッファ表示・コマンド実行
;;; 指定のバッファを表示バッファの存在をチェックして、無かったらコマンドを実行
;;;--------------------------------------------------
;; w3m や twittering-mode などを起動
;; 例 (:name window-name :plugin open :plugin-args (:buffer "*w3m*" :command 'w3m))
;;  :buffer  : 表示すべきバッファ。存在してなければコマンドを実行する。lambdaでも可。
;;  :command : 実行すべき関数のシンボル。関数の返値はバッファオブジェクト。

(defun e2wm:def-plugin-open (frame wm winfo)
  (let* ((plugin-args (wlf:window-option-get winfo :plugin-args))
         (buffer-name (plist-get plugin-args ':buffer))
         (command (plist-get plugin-args ':command)) buf)
    (unless (and command buffer-name)
      (error "e2wm:plugin open: arguments can not be nil. Check the options."))
    (setq buf (get-buffer buffer-name))
    (unless buf
      (with-selected-window (wlf:get-window wm (wlf:window-name winfo))
        (setq buf (funcall command))))
    (when buf
      (wlf:set-buffer wm (wlf:window-name winfo) buf))))

(e2wm:plugin-register 'open
                     "Open Buffer"
                     'e2wm:def-plugin-open)


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; ### Perspective Definition

;;; base / A base class for perspectives
;;;--------------------------------------------------

(e2wm:pst-class-register
  (make-e2wm:$pst-class
   :name       'base
   :display    'e2wm:dp-base-display
   :after-bury 'e2wm:dp-base-after-bury
   :update     'e2wm:dp-base-update))

(defun e2wm:dp-base-update (wm)
  ;;プラグイン更新実行
  (e2wm:plugin-exec-update (selected-frame) wm))

(defun e2wm:dp-base-display (buf)
  ;; delegate to the popup method
  (e2wm:pst-pop-to-buffer buf))

(defun e2wm:dp-base-after-bury (buried-buffer window)
  (let ((win-name (wlf:get-window-name (e2wm:pst-get-wm) window)))
    ;; manage the current buffer in e2wm
    (when win-name
      (e2wm:with-advice
       (e2wm:pst-buffer-set win-name (window-buffer window))))
    ;; remove the buffer from the history if it is the last buffer in
    ;; the current frame
    (when (cl-loop for other-win in (window-list)
                for other-buf = (window-buffer other-win)
                when (and (eq other-buf buried-buffer)
                          (not (eq other-win window)))
                return nil
                finally
                return t)
      (e2wm:message "#REMOVED BUFFER %s" buried-buffer)
      (e2wm:history-delete buried-buffer))
    ;; execute plugins (e.g. to update history)
    (when this-command
      (e2wm:pst-update-windows))))


;;; code / Code editing perspective
;;;--------------------------------------------------

(defvar e2wm:c-code-recipe
  '(| (:left-max-size 35)
      (- (:upper-size-ratio 0.7)
         files history)
      (- (:upper-size-ratio 0.7)
         (| (:right-max-size 30)
            main imenu)
         sub)))

(defvar e2wm:c-code-winfo
  '((:name main)
    (:name files :plugin files)
    (:name history :plugin history-list)
    (:name sub :buffer "*info*" :default-hide t)
    (:name imenu :plugin imenu :default-hide nil))
  )

(defvar e2wm:c-code-show-main-regexp
   "\\*\\(vc-diff\\)\\*")

(e2wm:pst-class-register
  (make-e2wm:$pst-class
   :name       'code
   :extend     'base
   :title      "Coding"
   :init       'e2wm:dp-code-init
   :main       'main
   :switch     'e2wm:dp-code-switch
   :popup      'e2wm:dp-code-popup
   :after-bury 'e2wm:dp-code-after-bury
   :keymap     'e2wm:dp-code-minor-mode-map))

(defun e2wm:dp-code-init ()
  (let*
      ((code-wm
        (wlf:no-layout
         e2wm:c-code-recipe
         e2wm:c-code-winfo))
       (buf (or e2wm:prev-selected-buffer
                (e2wm:history-get-main-buffer))))

    (when (e2wm:history-recordable-p e2wm:prev-selected-buffer)
      (e2wm:history-add e2wm:prev-selected-buffer))

    (wlf:set-buffer code-wm 'main buf)
    code-wm))

(defun e2wm:dp-code-switch (buf)
  (e2wm:message "#DP CODE switch : %s / %S" buf (e2wm:history-recordable-p buf))
  (if (e2wm:history-recordable-p buf)
      (progn
        (e2wm:pst-show-history-main)
        (e2wm:pst-window-select-main))
    nil))

(defun e2wm:dp-code-popup (buf)
  ;;とりあえず全部subで表示してみる
  (let ((cb (current-buffer)))
    (e2wm:message "#DP CODE popup : %s (current %s / backup %s)"
                 buf cb e2wm:override-window-cfg-backup))
  (let ((buf-name (buffer-name buf))
        (wm (e2wm:pst-get-wm)))
    (cond
     ((e2wm:history-recordable-p buf)
      (e2wm:pst-show-history-main)
      ;;記録対象なら履歴に残るのでupdateで表示を更新させる
      t)
     ((and e2wm:override-window-cfg-backup
       (eq (selected-window) (wlf:get-window wm 'sub)))
      ;;現在subならmainに表示しようとする
      ;;minibuffer以外の補完バッファは動きが特殊なのでbackupをnilにする
      (setq e2wm:override-window-cfg-backup nil)
      ;;一時的に表示するためにset-window-bufferを使う
      ;;(prefix) C-lなどで元のバッファに戻すため
      (set-window-buffer (wlf:get-window wm 'main) buf)
      t)
     ((and e2wm:c-code-show-main-regexp
           (string-match e2wm:c-code-show-main-regexp buf-name))
      (e2wm:pst-buffer-set 'main buf t)
      t)
     ;; For completion buffer (ad-hoc fix)
     ((and (= 0 (minibuffer-depth))
           (string-match "\\*Completions\\*" (buffer-name buf)))
      (let ((wm (e2wm:pst-get-wm))
            (curwin (selected-window))
            (e2wm:delete-other-windows-permission t))
        (delete-other-windows curwin)
        (wlf:show wm 'sub)
        (wlf:set-buffer wm 'sub buf t))
      t)
     (t
      (e2wm:dp-code-popup-sub buf)
      t))))

(defun e2wm:dp-code-popup-sub (buf)
  (let ((wm (e2wm:pst-get-wm))
        (not-minibufp (= 0 (minibuffer-depth))))
    (e2wm:with-advice
     (e2wm:pst-buffer-set 'sub buf t not-minibufp))))

(defun e2wm:dp-code-after-bury (buried-buffer window)
  "Close sub window if it is the current window."
  (e2wm:message "#DP CODE AFTER BURY %s %s" buried-buffer window)
  (e2wm:$pst-class-super)
  (let ((wm (e2wm:pst-get-wm)))
    (when (or (e2wm:buffer-completion-p buried-buffer)
              (eq (wlf:get-window-name wm window) 'sub))
      (wlf:hide wm 'sub)
      (wlf:select wm (e2wm:$pst-main (e2wm:pst-get-instance))))))

;; Commands / Keybindings

(defun e2wm:dp-code ()
  (interactive)
  (e2wm:pst-change 'code))

(defun e2wm:dp-code-imenu-toggle-command ()
  (interactive)
  (wlf:toggle (e2wm:pst-get-wm) 'imenu)
  (e2wm:pst-update-windows))
(defun e2wm:dp-code-sub-toggle-command ()
  (interactive)
  (wlf:toggle (e2wm:pst-get-wm) 'sub)
  (e2wm:pst-update-windows))
(defun e2wm:dp-code-navi-main-command ()
  (interactive)
  (wlf:select (e2wm:pst-get-wm) 'main))
(defun e2wm:dp-code-navi-files-command ()
  (interactive)
  (wlf:select (e2wm:pst-get-wm) 'files))
(defun e2wm:dp-code-navi-history-command ()
  (interactive)
  (wlf:select (e2wm:pst-get-wm) 'history))
(defun e2wm:dp-code-navi-imenu-command ()
  (interactive)
  (wlf:select (e2wm:pst-get-wm) 'imenu))
(defun e2wm:dp-code-navi-sub-command ()
  (interactive)
  (wlf:select (e2wm:pst-get-wm) 'sub))
(defun e2wm:dp-code-main-maximize-toggle-command ()
  (interactive)
  (wlf:toggle-maximize (e2wm:pst-get-wm) 'main))

(defun e2wm:dp-code-toggle-clock-command ()
  (interactive)
  (let* ((wm (e2wm:pst-get-wm))
         (prev (e2wm:pst-window-plugin-get wm 'history))
         (next (if (eq prev 'history-list)
                   'clock 'history-list)))
    (e2wm:pst-window-plugin-set wm 'history next)
    (e2wm:pst-update-windows)))

(defvar e2wm:dp-code-minor-mode-map
      (e2wm:define-keymap
       '(("prefix I" . e2wm:dp-code-imenu-toggle-command)
         ("prefix S" . e2wm:dp-code-sub-toggle-command)
         ("prefix C" . e2wm:dp-code-toggle-clock-command)
         ("prefix M" . e2wm:dp-code-main-maximize-toggle-command))
       e2wm:prefix-key))

;;; two / Two column editing perspective
;;;--------------------------------------------------

(defvar e2wm:c-two-recipe
      '(- (:upper-size-ratio 0.8)
          (| left
             (- (:upper-size-ratio 0.9)
                right history))
          sub))

(defvar e2wm:c-two-winfo
      '((:name left )
        (:name right )
        (:name sub :buffer "*Help*" :default-hide t)
        (:name history :plugin history-list2 :default-hide nil)))

(defvar e2wm:c-two-right-default 'left) ; left, prev

(e2wm:pst-class-register
  (make-e2wm:$pst-class
   :name       'two
   :extend     'base
   :title      "Two Columns"
   :init       'e2wm:dp-two-init
   :main       'left
   :switch     'e2wm:dp-two-switch
   :popup      'e2wm:dp-two-popup
   :display    'e2wm:dp-two-display
   :after-bury 'e2wm:dp-two-after-bury
   :keymap     'e2wm:dp-two-minor-mode-map))

(defun e2wm:dp-two-init ()
  (let*
      ((two-wm
        (wlf:no-layout
         e2wm:c-two-recipe
         e2wm:c-two-winfo))
       (buf (or e2wm:prev-selected-buffer
                (e2wm:history-get-main-buffer))))

    (wlf:set-buffer two-wm 'left buf)
    (cond
     ((eq e2wm:c-two-right-default 'left)
      (wlf:set-buffer two-wm 'right buf))
     ((eq e2wm:c-two-right-default 'prev)
      (wlf:set-buffer two-wm 'right (e2wm:history-get-prev buf)))
     (t
      (wlf:set-buffer two-wm 'right (e2wm:history-get-prev buf))))

    two-wm))

(defun e2wm:dp-two-switch (buf)
  "Switch to the buffer BUF.  If in the left window the buffer
BUF is same as the shown one, show the same buffer on the right
window too."
  (e2wm:message "#DP TWO switch : %s" buf)
  (let ((wm (e2wm:pst-get-wm))
        (curwin (selected-window)))
    (cond
     ((eql curwin (wlf:get-window wm 'left)) ; in left window
      (cond
       ((eql (get-buffer buf) (wlf:get-buffer wm 'left))
        ;; switching to the same buffer.  show it in the right.
        (e2wm:pst-update-windows)
        (e2wm:pst-buffer-set 'right buf)
        t)
       ((e2wm:history-recordable-p buf)
        ;; put in the history and show if it is a recordable
        (e2wm:pst-show-history-main)
        t)
       (t
        ;; otherwise, do the default
        nil)))

     ((eql curwin (wlf:get-window wm 'right)) ; in right window
      (e2wm:pst-buffer-set 'right buf)
      (e2wm:dp-two-update-history-list)
      t)
     (t nil))))

(defun e2wm:dp-two-popup (buf)
  "Show the buffer BUF in sub if it is not recordable or document buffer.
Otherwise show and select it."
  (e2wm:message "#DP TWO popup : %s" buf)
  (cond
   ((e2wm:document-buffer-p buf)
    (e2wm:pst-buffer-set 'right buf)
    t)
   ((e2wm:history-recordable-p buf)
    (e2wm:pst-show-history-main)
    t)
   (t
    (e2wm:dp-two-popup-sub buf)
    t)))

(defun e2wm:dp-two-popup-sub (buf)
  (let ((wm (e2wm:pst-get-wm))
        (not-minibufp (= 0 (minibuffer-depth))))
    (e2wm:with-advice
     (e2wm:pst-buffer-set 'sub buf t not-minibufp))))

(defun e2wm:dp-two-display (buf)
  "Show the buffer BUF in sub if it is not recordable or document buffer.
Do not select the buffer."
  (e2wm:message "#DP TWO display : %s" buf)
  (cond
   ((or (e2wm:history-recordable-p buf) ; we don't need to distinguish
        (e2wm:document-buffer-p buf))   ; these two as we don't select
    (let ((wm (e2wm:pst-get-wm))
          (curwin (selected-window)))
      ;; show in the other window, but don't select.
      (if (eql curwin (wlf:get-window wm 'left))
          (e2wm:pst-buffer-set 'right buf)
        (e2wm:pst-buffer-set 'left buf)))
    (e2wm:pst-update-windows)           ; update plugins, etc.
    t)
   ;; For completion buffer (ad-hoc fix)
   ((and (= 0 (minibuffer-depth))
         (e2wm:buffer-completion-p buf))
    (let ((wm (e2wm:pst-get-wm))
          (curwin (selected-window))
          (e2wm:delete-other-windows-permission t))
      (delete-other-windows curwin)
      (wlf:show wm 'sub)
      (wlf:set-buffer wm 'sub buf t))
    t)
   (t
    (e2wm:pst-buffer-set 'sub buf t)
    t)))

(defun e2wm:dp-two-after-bury (buried-buffer window)
  "Close sub window if it is the current window."
  (e2wm:message "#DP CODE AFTER BURY %s %s" buried-buffer window)
  (e2wm:$pst-class-super)
  (let ((wm (e2wm:pst-get-wm)))
    (when (or (e2wm:buffer-completion-p buried-buffer)
              (eq (wlf:get-window-name wm window) 'sub))
      (wlf:hide wm 'sub)
      (wlf:select wm (e2wm:$pst-main (e2wm:pst-get-instance))))))

;; Commands / Keybindings

(defun e2wm:dp-two ()
  (interactive)
  (e2wm:pst-change 'two))

(defun e2wm:dp-two-navi-left-command ()
  (interactive)
  (e2wm:pst-window-select 'left))
(defun e2wm:dp-two-navi-right-command ()
  (interactive)
  (e2wm:pst-window-select 'right))
(defun e2wm:dp-two-navi-sub-command ()
  (interactive)
  (e2wm:pst-window-select 'sub))
(defun e2wm:dp-two-navi-history-command ()
  (interactive)
  (e2wm:pst-window-select 'history))

(defun e2wm:dp-two-history-toggle-command ()
  (interactive)
  (wlf:toggle (e2wm:pst-get-wm) 'history)
  (e2wm:pst-update-windows))
(defun e2wm:dp-two-sub-toggle-command ()
  (interactive)
  (wlf:toggle (e2wm:pst-get-wm) 'sub)
  (e2wm:pst-update-windows))

(defun e2wm:dp-two-update-history-list ()
  (e2wm:plugin-exec-update-by-plugin-name
   (selected-frame) (e2wm:pst-get-wm) 'history-list2))

(defun e2wm:dp-two-double-column-command ()
  (interactive)
  (e2wm:pst-buffer-set 'right (e2wm:history-get-main-buffer))
  (e2wm:dp-two-update-history-list))

(defun e2wm:dp-two-get-right-buffer ()
  (let ((rbuf (e2wm:pst-buffer-get 'right)))
    (e2wm:aif (member rbuf (append (e2wm:history-get) (e2wm:history-get-backup)))
        (car it)
      (or
       (car (e2wm:history-get))
       (car (e2wm:history-get-backup))
       rbuf))))

(defun e2wm:dp-two-right-history-forward-command ()
  (interactive)
  (e2wm:pst-buffer-set
   'right (e2wm:history-get-next (e2wm:dp-two-get-right-buffer)))
  (e2wm:dp-two-update-history-list))

(defun e2wm:dp-two-right-history-back-command ()
  (interactive)
  (e2wm:pst-buffer-set
   'right (e2wm:history-get-prev (e2wm:dp-two-get-right-buffer)))
  (e2wm:dp-two-update-history-list))

(defalias 'e2wm:dp-two-right-history-up-command 'e2wm:dp-two-right-history-forward-command)
(defalias 'e2wm:dp-two-right-history-down-command 'e2wm:dp-two-right-history-back-command)

(defun e2wm:dp-two-swap-buffers-command ()
  (interactive)
  (let ((left  (e2wm:pst-buffer-get 'left))
        (right (e2wm:pst-buffer-get 'right)))
    (e2wm:pst-buffer-set 'left  right)
    (e2wm:pst-buffer-set 'right left)
  (e2wm:dp-two-update-history-list)))

(defun e2wm:dp-two-main-maximize-toggle-command ()
  (interactive)
  (wlf:toggle-maximize (e2wm:pst-get-wm) 'left))

(defvar e2wm:dp-two-minor-mode-map
  (e2wm:define-keymap
   '(("prefix d" . e2wm:dp-two-double-column-command)
     ("prefix S" . e2wm:dp-two-sub-toggle-command)
     ("prefix -" . e2wm:dp-two-swap-buffers-command)
     ("prefix N" . e2wm:dp-two-right-history-down-command)
     ("prefix P" . e2wm:dp-two-right-history-up-command)
     ("prefix H" . e2wm:dp-two-history-toggle-command)
     ("prefix M" . e2wm:dp-two-main-maximize-toggle-command))
   e2wm:prefix-key))

;;; htwo / Horizontal split editing perspective
;;;--------------------------------------------------

(defvar e2wm:c-htwo-recipe
      '(| (:left-size-ratio 0.55)
          (| (:left-max-size 30)
             (- (:upper-size-ratio 0.7)
                files history)
             (- left right)) ; 継承してサボるためにleft,rightにする
          sub))

(defvar e2wm:c-htwo-winfo
      '((:name left )
        (:name right )
        (:name sub :buffer "*Help*" :default-hide t)
        (:name files :plugin files)
        (:name history :plugin history-list2)))

(e2wm:pst-class-register
  (make-e2wm:$pst-class
   :name   'htwo
   :extend 'two
   :title  "Horizontal Two"
   :init   'e2wm:dp-htwo-init))

(defun e2wm:dp-htwo-init ()
  (let*
      ((htwo-wm
        (wlf:no-layout
         e2wm:c-htwo-recipe
         e2wm:c-htwo-winfo))
       (buf (or e2wm:prev-selected-buffer
                (e2wm:history-get-main-buffer))))

    (wlf:set-buffer htwo-wm 'left buf)
    (cond
     ((eq e2wm:c-two-right-default 'left)
      (wlf:set-buffer htwo-wm 'right buf))
     ((eq e2wm:c-two-right-default 'prev)
      (wlf:set-buffer htwo-wm 'right (e2wm:history-get-prev buf)))
     (t
      (wlf:set-buffer htwo-wm 'right (e2wm:history-get-prev buf))))

    htwo-wm))

(defun e2wm:dp-htwo ()
  (interactive)
  (e2wm:pst-change 'htwo))


;;; document / Document view perspective
;;;--------------------------------------------------

(defvar e2wm:c-doc-recipe
      '(- (:upper-size-ratio 0.75)
        (| left right)
        sub))

(defvar e2wm:c-doc-winfo
      '((:name left)
        (:name right)
        (:name sub :default-hide t)))

(e2wm:pst-class-register
  (make-e2wm:$pst-class
   :name   'doc
   :extend 'base
   :init   'e2wm:dp-doc-init
   :title  "Document"
   :main   'left
   :start  'e2wm:dp-doc-start
   :update 'e2wm:dp-doc-update
   :switch 'e2wm:dp-doc-switch
   :popup  'e2wm:dp-doc-popup
   :leave  'e2wm:dp-doc-leave
   :keymap 'e2wm:dp-doc-minor-mode-map))

(defun e2wm:dp-doc-set-doc-buffer (buf)
  (e2wm:frame-param-set 'e2wm:dp-doc-buffer buf))

(defun e2wm:dp-doc-get-doc-buffer ()
  (e2wm:frame-param-get 'e2wm:dp-doc-buffer))

(defun e2wm:dp-doc-init ()
  (let*
      ((doc-wm
        (wlf:no-layout
         e2wm:c-doc-recipe
         e2wm:c-doc-winfo))
       (buf (e2wm:dp-doc-get-doc-buffer)))

    (unless (and buf (buffer-live-p buf))
      (setq buf (or e2wm:prev-selected-buffer
                    (e2wm:history-get-main-buffer))))

    (wlf:set-buffer doc-wm 'left buf)
    doc-wm))

(defun e2wm:dp-doc-start (wm)
  (with-current-buffer (wlf:get-buffer wm 'left)
    (follow-mode 1)))

(defun e2wm:dp-doc-update (wm)
  (e2wm:message "#DP DOC update")
  (e2wm:$pst-class-super)
  ;;左右を同じにする
  (let ((leftbuf  (wlf:get-buffer wm 'left))
        (rightbuf (wlf:get-buffer wm 'right)))
    (unless (eql leftbuf rightbuf)
        (with-current-buffer leftbuf
          (follow-mode 1))
        (wlf:set-buffer wm 'right leftbuf))))

(defun e2wm:dp-doc-set-main-buffer (buf)
  (let ((wm (e2wm:pst-get-wm)))
    (with-current-buffer buf
      (follow-mode 1))
    (e2wm:pst-buffer-set 'left buf)
    (e2wm:pst-buffer-set 'right buf)))

(defun e2wm:dp-doc-switch (buf)
  ;;left,rightでswitch-to-bufferが起きたら、乗っ取って両方に表示する。
  (e2wm:message "#DP DOC switch : %s" buf)
  (let ((wm (e2wm:pst-get-wm))
        (curwin (selected-window)))
    (if (or (eql curwin (wlf:get-window wm 'left))
            (eql curwin (wlf:get-window wm 'right)))
        (progn
          (e2wm:dp-doc-set-main-buffer buf)
          t)
      nil)))

(defun e2wm:dp-doc-popup (buf)
  (e2wm:message "#DP DOC popup : %s" buf)
  (let ((buf-name (buffer-name buf)))
    (cond
     ((or (e2wm:document-buffer-p buf)
          (e2wm:history-recordable-p buf))
      (e2wm:dp-doc-set-main-buffer buf)
      t)
     (t
      (e2wm:dp-doc-popup-sub buf)
      t))))

(defun e2wm:dp-doc-popup-sub (buf)
  (let ((wm (e2wm:pst-get-wm))
        (not-minibufp (= 0 (minibuffer-depth))))
    (e2wm:with-advice
     (e2wm:pst-buffer-set 'sub buf t not-minibufp))))

(defun e2wm:dp-doc-leave (wm)
  (let ((buf (get-buffer (wlf:get-buffer wm 'left))))
    (when (and buf (buffer-live-p buf))
      (unless (e2wm:history-recordable-p buf) ; ドキュメント的バッファだったら
        (e2wm:dp-doc-set-doc-buffer buf)      ; あとで再表示できるようにして、
        (setq e2wm:prev-selected-buffer nil))))   ; 次のパースペクティブは履歴から持ってきてもらう
  (cl-loop for b in (buffer-list)
        do (with-current-buffer b
             (when follow-mode
               (follow-mode -1)))))

;; Commands / Keybindings

(defun e2wm:dp-doc ()
  (interactive)
  (e2wm:pst-change 'doc))

(defun e2wm:dp-doc-navi-main-command ()
  (interactive)
  (wlf:select (e2wm:pst-get-wm) 'left))
(defun e2wm:dp-doc-navi-sub-command ()
  (interactive)
  (wlf:select (e2wm:pst-get-wm) 'sub))
(defun e2wm:dp-doc-sub-toggle-command ()
  (interactive)
  (wlf:toggle (e2wm:pst-get-wm) 'sub)
  (e2wm:pst-update-windows))
(defun e2wm:dp-doc-main-maximize-toggle-command ()
  (interactive)
  (wlf:toggle-maximize (e2wm:pst-get-wm) 'left))

(defvar e2wm:dp-doc-minor-mode-map
      (e2wm:define-keymap
       '(("prefix m" . e2wm:dp-doc-navi-main-command)
         ("prefix s" . e2wm:dp-doc-navi-sub-command)
         ("prefix S" . e2wm:dp-doc-sub-toggle-command)
         ("prefix M" . e2wm:dp-doc-main-maximize-toggle-command)
         ("prefix I" . info))
       e2wm:prefix-key))

;;; dashboard / dashboard buffers perspective
;;;--------------------------------------------------

(defvar e2wm:c-dashboard-plugins
  '(
    (open :plugin-args (:command eshell :buffer "*eshell*"))
    (open :plugin-args (:command doctor :buffer "*doctor*"))
    ))

(e2wm:pst-class-register
 (make-e2wm:$pst-class
     :name   'dashboard
     :extend 'base
     :title  "Dashboard"
     :main   'w-1-1
     :init   'e2wm:dp-dashboard-init
     :start  'e2wm:dp-dashboard-start
     :leave  'e2wm:dp-dashboard-leave))

(defun e2wm:dp-dashboard-init ()
  (let* ((size (e2wm:dp-array-calculate-size
                (length e2wm:c-dashboard-plugins)))
         (w (car size)) (h (cdr size))
         (recipe (e2wm:dp-array-make-recipe w h))
         (wparams (e2wm:dp-array-make-winfo w h))
         (wm (wlf:no-layout recipe wparams)))
    (e2wm:dp-dashboard-arrange-plugins wm)
    wm))

(defun e2wm:dp-dashboard-arrange-plugins (wm)
  (cl-loop for winfo in (wlf:wset-winfo-list wm)
        with cnt = 0
        for opt = (wlf:window-options winfo)
        for plugin = (nth cnt e2wm:c-dashboard-plugins)
        do
        (cond
         ((null plugin)
          (plist-put opt ':buffer (e2wm:get-blank-buffer)))
         ((symbolp plugin)
          (plist-put opt ':plugin plugin))
         ((consp plugin)
          (plist-put opt ':plugin (car plugin))
          (nconc opt (cdr plugin)))
         (t
          (plist-put opt ':buffer (e2wm:get-blank-buffer))))
        (cl-incf cnt))
  wm)

(defun e2wm:dp-dashboard-start (wm)
  (e2wm:dp-dashboard-update-summary))

(defun e2wm:dp-dashboard-leave (wm)
  (unless (e2wm:history-recordable-p e2wm:prev-selected-buffer)
    (setq e2wm:prev-selected-buffer nil)
    (setq prev-selected-buffer nil)))   ; 次のパースペクティブは履歴から持ってきてもらう

(defun e2wm:dp-dashboard-update-summary ()
  (let* ((bufname " *WM:EmacsStat*")
         (buf (get-buffer bufname))
         (wm (e2wm:pst-get-wm)))
    (unless (and buf (buffer-live-p buf))
      (setq buf (get-buffer-create bufname))
      (with-current-buffer buf
        (setq buffer-read-only t)
        (buffer-disable-undo buf)))
    (with-current-buffer buf
      (let (buffer-read-only)
        (erase-buffer)
        (goto-char (point-min))
        (e2wm:dp-dashboard-insert-summary-info)))
    (wlf:set-buffer wm 'summary buf)))

(defun e2wm:dp-dashboard-parse-garbage-collect-1 (gc-info)
  (cl-multiple-value-bind
      (conses syms miscs used-string-chars
              used-vector-slots floats intervals strings)
      gc-info
    (let* ((used-conses    (car conses))
           (free-conses    (cdr conses))
           (used-miscs     (car miscs))
           (free-miscs     (cdr miscs))
           (used-syms      (car syms))
           (free-syms      (cdr syms))
           (used-floats    (car floats))
           (free-floats    (cdr floats))
           (used-strings   (car strings))
           (free-strings   (cdr strings))
           (used-intervals (car intervals))
           (free-intervals (cdr intervals)))
      (list used-conses    free-conses
            used-miscs     free-miscs
            used-syms      free-syms
            used-floats    free-floats
            used-strings   free-strings
            used-intervals free-intervals
            used-string-chars
            used-vector-slots))))

(defun e2wm:dp-dashboard-parse-garbage-collect-2 (gc-info)
  ;; For the following Emacs in Ubuntu 12.04
  ;; GNU Emacs 24.3.1 (i686-pc-linux-gnu, GTK+ Version 3.4.2)
  ;; of 2014-02-22 on chindi10, modified by Debian
  (cl-multiple-value-bind
      (conses syms miscs strings string-bytes
              vectors vector-slots floats intervals)
      gc-info
    (let* ((used-conses       (nth 2 conses))
           (free-conses       (nth 3 conses))
           (used-miscs        (nth 2 miscs))
           (free-miscs        (nth 3 miscs))
           (used-syms         (nth 2 syms))
           (free-syms         (nth 3 syms))
           (used-floats       (nth 2 floats))
           (free-floats       (nth 3 floats))
           (used-strings      (nth 2 strings))
           (free-strings      (nth 3 strings))
           (used-intervals    (nth 2 intervals))
           (free-intervals    (nth 3 intervals))
           (used-string-chars (nth 2 string-bytes))
           (used-vector-slots (nth 2 vector-slots)))
      (list used-conses    free-conses
            used-miscs     free-miscs
            used-syms      free-syms
            used-floats    free-floats
            used-strings   free-strings
            used-intervals free-intervals
            used-string-chars
            used-vector-slots))))

(defun e2wm:dp-dashboard-parse-garbage-collect ()
  (cl-loop with gc-info = (garbage-collect)
        for f in '(e2wm:dp-dashboard-parse-garbage-collect-1
                   e2wm:dp-dashboard-parse-garbage-collect-2)
        for ret = (funcall f gc-info)
        if (cl-loop for e in ret always (numberp e))
        return ret
        finally return '(0 0 0 0 0 0 0 0 0 0 0 0 0 0)))

(defun e2wm:dp-dashboard-insert-summary-info ()
  (cl-multiple-value-bind
      ( used-conses    free-conses
        used-miscs     free-miscs
        used-syms      free-syms
        used-floats    free-floats
        used-strings   free-strings
        used-intervals free-intervals
        used-string-chars
        used-vector-slots )
      (e2wm:dp-dashboard-parse-garbage-collect)
    (let* ((buf-num (length (buffer-list)))
           (pure-mem (e2wm:format-byte-unit pure-bytes-used))
           (gccons (e2wm:format-byte-unit gc-cons-threshold))
           (mem-limit (e2wm:format-byte-unit (* 1024 (memory-limit)))))
      (cl-flet
          ((percent (used free)
                    (let ((u (* 1.0 used)))
                      (format "%.2f" (* 100.0 (/ u (+ u free)))))))
        (insert
         (e2wm:rt-format "Emacs stat:\n"))
        (insert
         (e2wm:rt-format "  Conses: %s (%s%%) /  Syms: %s (%s%%) / Miscs: %s (%s%%) / String Chars %s\n"
                        (e2wm:num used-conses) (percent used-conses free-conses)
                        (e2wm:num used-syms) (percent used-syms free-syms)
                        (e2wm:num used-miscs) (percent used-miscs free-miscs)
                        (e2wm:num used-string-chars)))
        (insert
         (e2wm:rt-format "  Floats: %s (%s%%) /  Strings: %s (%s%%) / Intervals: %s (%s%%) / Vectors %s\n"
                        (e2wm:num used-floats) (percent used-floats free-floats)
                        (e2wm:num used-strings) (percent used-strings free-strings)
                        (e2wm:num used-intervals) (percent used-intervals free-intervals)
                        (e2wm:num used-vector-slots)))
         (insert
          (e2wm:rt-format "  Buffers: %s  /  Memory Limit: %s  /  Pure: %s"
                         buf-num mem-limit pure-mem))))))

;; Commands / Keybindings

(defun e2wm:dp-dashboard ()
  (interactive)
  (e2wm:pst-change 'dashboard))

;;; array / arrange buffers perspective
;;;--------------------------------------------------

(defvar e2wm:c-array-font-decrease 3) ; フォントのを小さくする相対サイズ
(defvar e2wm:c-array-max-rows 4)  ; 並べる横最大数
(defvar e2wm:c-array-max-cols 5)  ; 並べる縦最大数

(defvar e2wm:c-array-more-buffers-pred
  (lambda (b)
    (let ((bn (buffer-name b)))
      (and
       (not  ; 表示しないもの
        (memq (buffer-local-value 'major-mode b)
              '(dired-mode)))
       (or
        (e2wm:document-buffer-p b) ; ドキュメントは表示する
        (not (string-match "^ ?\\*" bn)) ; 内部バッファは表示しないが、
        (string-match ; 以下のものは表示する
         "\\*\\(scratch\\|Messages\\)\\*"
         bn))))))

(defvar e2wm:c-array-smart-buffers-functions nil) ; 最初にバッファのリストを返したものが有効

(defvar e2wm:c-array-summary-size-ratio 0.12)

(defun e2wm:dp-array-make-recipe (cols rows)
  ;; cols x rows の recipe を作る
  (let ((sz-array (- 1.0 e2wm:c-array-summary-size-ratio)))
    (cl-decf cols) (cl-decf rows)
    (cl-labels
     ((loop-rows
       (cols rows)
       (cl-loop for i from rows downto 1
                with ret = nil
                if (< i rows)
                do (setq ret
                         (list
                          '- (list :upper-size-ratio
                                   (* sz-array (/ 1.0 (- rows (- i 1.5)))))
                          (loop-cols cols i) ret))
                else
                do (setq ret
                         (list '- (loop-cols cols i)
                               (loop-cols cols (1+ i))))
                finally return ret))
         (loop-cols
          (cols y)
          (cl-loop for i from cols downto 1
                with ret = nil
                if (< i cols)
                do (setq ret (list
                              '| (list :left-size-ratio
                                       (/ 1.0 (- cols (- i 2))))
                              (mk i y) ret))
                else
                do (setq ret (list '| (mk i y) (mk (1+ i) y)))
                finally return ret))
         (mk (x y) (intern (format "w-%i-%i" x y))))
      (let ((ar (cond
                 ((and (eql cols 0) (eql rows 0))
                  'w-1-1)
                 ((< rows 1)
                  (loop-cols 1 1))
                 (t
                  (loop-rows cols rows)))))
        (list '- (list ':upper-size-ratio sz-array) ar 'summary)))))

(defun e2wm:dp-array-make-winfo (cols rows)
  ;; cols x rows の winfo を作る
  (cl-labels
      ((loop-rows (cols rows)
                  (cl-loop for i from 1 to rows
                           with ret = nil
                           do (setq ret (nconc ret (loop-cols cols i)))
                           finally return ret))
       (loop-cols (cols y)
                  (cl-loop for i from 1 to cols
                           with ret = nil
                           do (setq ret (nconc ret (list (mk i y))))
                           finally return ret))
       (mk (x y) (list ':name (intern (format "w-%i-%i" x y)))))
    (let ((ar (loop-rows cols rows)))
      (add-to-list 'ar '(:name summary) t))))

(defun e2wm:dp-array-calculate-size (num)
  ;;num個のサイズが入る縦横幅を計算する
  ;;なるべく縦横の数が離れすぎないような数を探す
  (cl-labels
      ((loop-rows (cols rows)
                  (cl-loop for i from 1 to rows
                        for ret = (loop-cols i i cols)
                        if ret
                        return ret
                        finally return (cons cols rows)))
       (loop-cols (cols y mx)
                  (cl-loop for i from y to (min (1+ y) mx)
                        if (<= num (* i y))
                        return (cons i y)
                        finally return nil)))
    (loop-rows e2wm:c-array-max-cols
               e2wm:c-array-max-rows)))

(defun e2wm:dp-array-make-wm (buffers)
  (let* ((size (e2wm:dp-array-calculate-size (length buffers)))
         (w (car size)) (h (cdr size))
         (recipe (e2wm:dp-array-make-recipe w h))
         (wparams (e2wm:dp-array-make-winfo w h))
         (wm (wlf:no-layout recipe wparams)))
    (e2wm:dp-array-arrange-buffers wm buffers)
    wm))

(e2wm:pst-class-register
 (make-e2wm:$pst-class
     :name   'array
     :extend 'base
     :title  "Buffer Array"
     :main   'w-1-1
     :init   'e2wm:dp-array-init
     :popup  'e2wm:dp-array-popup
     :start  'e2wm:dp-array-start
     :leave  'e2wm:dp-array-leave))

(defvar e2wm:dp-array-buffers-function
  'e2wm:dp-array-get-smart-buffers) ; この関数を切り替える

(defvar e2wm:dp-array-buffers-function-backup nil) ; toggleする際のバックアップ

(defun e2wm:dp-array-init ()
  (when (not e2wm:dp-array-buffers-function-backup)
    (setq e2wm:dp-array-buffers-function-backup e2wm:dp-array-buffers-function))
  (let*
      ((array-wm (e2wm:dp-array-make-wm
                  (funcall e2wm:dp-array-buffers-function))))
    array-wm))

(defvar e2wm:dp-array-backup-globalmap nil)

(defun e2wm:dp-array-start (wm)
  (e2wm:message "#ARRAY START")
  (setq e2wm:dp-array-backup-globalmap global-map)
  (use-global-map e2wm:dp-array-minor-mode-map) ; 強引
  (setq overriding-terminal-local-map e2wm:dp-array-minor-mode-map)
  (e2wm:dp-array-decrease-fontsize)
  (e2wm:dp-array-update-summary))

(defun e2wm:dp-array-leave (wm)
  (e2wm:message "#ARRAY LEAVE")
  (use-global-map e2wm:dp-array-backup-globalmap)
  (setq overriding-terminal-local-map nil)
  (when e2wm:dp-array-overlay-focus
    (delete-overlay e2wm:dp-array-overlay-focus))
  (e2wm:dp-array-increase-fontsize))

(defun e2wm:dp-array-arrange-buffers (wm buffers)
  (cl-loop for winfo in (wlf:wset-winfo-list wm)
        with cnt = 0
        for opt = (wlf:window-options winfo)
        do (plist-put
            opt ':buffer
            (e2wm:aif (nth cnt buffers)
                it (e2wm:get-blank-buffer)))
        (cl-incf cnt))
  wm)

(defun e2wm:dp-array-get-recordable-buffers ()
  ;;履歴に記録しそうなもの一覧
  (let ((ret
         (append
          (reverse (e2wm:history-get))
          (cl-copy-list (e2wm:history-get-backup))
          )))
    (cl-loop for b in (buffer-list)
          if (and (e2wm:history-recordable-p b)
                  (not (member b ret)))
          do (push b ret))
    (nreverse ret)))

(defun e2wm:dp-array-get-more-buffers ()
  ;;表示して意味がありそうなもの
  (let ((ret
         (append
          (reverse (e2wm:history-get))
          (cl-copy-list (e2wm:history-get-backup))
          )))
    (cl-loop for b in (buffer-list)
          if (and (funcall e2wm:c-array-more-buffers-pred b)
                  (not (member b ret)))
          do (push b ret))
    (nreverse ret)))

(defun e2wm:dp-array-get-smart-buffers ()
  (cl-loop for f in e2wm:c-array-smart-buffers-functions
        for ret = (funcall f)
        if ret return ret
        finally return (e2wm:dp-array-get-recordable-buffers)))

(defun e2wm:dp-array-get-same-mode-buffers ()
  (cl-loop with mmode = (buffer-local-value 'major-mode (current-buffer))
        for b in (buffer-list)
        if (eq (buffer-local-value 'major-mode b) mmode)
        collect b))

(defun e2wm:dp-array-get-same-mode-buffers-if-not-recordable ()
  (when (not (e2wm:history-recordable-p (current-buffer)))
    (e2wm:dp-array-get-same-mode-buffers)))

(defun e2wm:dp-array-popup (buf)
  (e2wm:message "#DP ARRAY popup : %s" buf)
  (let ((wm (e2wm:pst-get-wm)))
    (e2wm:with-advice
     (wlf:set-buffer wm 'summary buf)))
  t)

(defun e2wm:dp-array-decrease-fontsize ()
  (when (fboundp 'text-scale-decrease)
    (cl-loop for b in (buffer-list)
          if (not (minibufferp b))
          do (with-current-buffer b
               (text-scale-decrease e2wm:c-array-font-decrease)))))

(defun e2wm:dp-array-increase-fontsize ()
  (when (fboundp 'text-scale-increase)
    (cl-loop for b in (buffer-list)
          if (not (minibufferp b))
          do (with-current-buffer b
               (text-scale-increase e2wm:c-array-font-decrease)))))

(defun e2wm:dp-array-update-summary ()
  (let* ((bufname " *WM:ArraySummary*")
         (buf (get-buffer bufname))
         (wm (e2wm:pst-get-wm))
         (win (wlf:get-window wm 'summary))
         (selected-buf (window-buffer (selected-window))))
    (unless (and buf (buffer-live-p buf))
      (setq buf (get-buffer-create bufname))
      (with-current-buffer buf
        (setq buffer-read-only t)
        (buffer-disable-undo buf)))
    (with-current-buffer buf
      (let (buffer-read-only)
        (erase-buffer)
        (goto-char (point-min))
        (unless (eql selected-buf buf)
          (e2wm:dp-array-insert-summary-info
           selected-buf))))
    (wlf:set-buffer wm 'summary buf))
  (e2wm:dp-array-hilite-focus))

(defun e2wm:dp-array-insert-summary-info (selected-buf)
  (cond
   ((buffer-local-value 'buffer-file-name selected-buf)
    (let* ((f (buffer-local-value 'buffer-file-name selected-buf))
           (filename (file-name-nondirectory f))
           (vc (e2wm:aif (buffer-local-value 'vc-mode selected-buf)
                   (substring it 0) "None"))
           (dir (file-name-directory f))
           (mode (file-modes f))
           (attr (file-attributes f))
           (modified-time (nth 5 attr))
           (size (nth 7 attr))
           (strsize (e2wm:format-byte-unit size)))
      (insert
       (e2wm:rt-format "File Name: %s  (Path: %s)\n"
               (cons  filename 'e2wm:face-title) dir)
       (e2wm:rt-format "Mode: %s  /  Modified Time: %s\n"
               (format "%o" mode) (e2wm:strtime modified-time))
       (e2wm:rt-format "File Size: %s  /  Lines: %s  /  Version Control: %s"
               strsize
               (int-to-string (with-current-buffer selected-buf
                 (count-lines (point-min) (point-max))))
               vc))))
   (t
    (insert
     (e2wm:rt-format
      "Buffer Name: %s\nMajor Mode: %s"
      (substring-no-properties (buffer-name selected-buf))
      (format "%s" (buffer-local-value
                    'major-mode selected-buf)))))))

(defvar e2wm:dp-array-overlay-focus nil "[internal]")

(defun e2wm:dp-array-hilite-focus ()
  (when e2wm:dp-array-overlay-focus
    (delete-overlay e2wm:dp-array-overlay-focus))
  (setq e2wm:dp-array-overlay-focus
        (make-overlay (point-min) (point-max)))
  (overlay-put e2wm:dp-array-overlay-focus 'face 'highlight))

;; Commands / Keybindings

(defun e2wm:dp-array ()
  (interactive)
  (e2wm:pst-change 'array))

(defun e2wm:dp-array-move-left-command ()
  (interactive)
  (e2wm:not-minibuffer
   (windmove-left)
   (e2wm:dp-array-update-summary)))
(defun e2wm:dp-array-move-right-command ()
  (interactive)
  (e2wm:not-minibuffer
   (windmove-right)
   (e2wm:dp-array-update-summary)))
(defun e2wm:dp-array-move-up-command ()
  (interactive)
  (e2wm:not-minibuffer
   (windmove-up)
   (e2wm:dp-array-update-summary)))
(defun e2wm:dp-array-move-down-command ()
  (interactive)
  (e2wm:not-minibuffer
   (let ((cwin (selected-window))
         (bwin (wlf:get-window (e2wm:pst-get-wm) 'summary)))
     (windmove-down)
     (when (eql (selected-window) bwin)
       (select-window cwin)))
   (e2wm:dp-array-update-summary)))
(defun e2wm:dp-array-goto-prev-pst-command ()
  (interactive)
  (e2wm:not-minibuffer
   (or (e2wm:pst-change-prev)
       (let ((buf (current-buffer)))
         (e2wm:stop-management)
         (switch-to-buffer buf)))))
(defun e2wm:dp-array-toggle-more-buffers-command ()
  (interactive)
  (e2wm:not-minibuffer
   (setq e2wm:dp-array-buffers-function
         (if (eq e2wm:dp-array-buffers-function
                 e2wm:dp-array-buffers-function-backup)
             'e2wm:dp-array-get-more-buffers
           e2wm:dp-array-buffers-function-backup))
   (e2wm:pst-change 'array)))
(defun e2wm:dp-array-cancel-command ()
  (interactive)
  (e2wm:not-minibuffer
   (wlf:select (e2wm:pst-get-wm) 'w-1-1)
   (or (e2wm:pst-change-prev)
       (e2wm:stop-management))))

(defvar e2wm:dp-array-minor-mode-map
  (let ((keymap (make-keymap)))
    (suppress-keymap keymap)
    (e2wm:add-keymap keymap
   '(("<SPC>"  . e2wm:dp-array-toggle-more-buffers-command)
     ;;cursor
     ([left]  . e2wm:dp-array-move-left-command)
     ([right] . e2wm:dp-array-move-right-command)
     ([up]    . e2wm:dp-array-move-up-command)
     ([down]  . e2wm:dp-array-move-down-command)
     ;;emacs
     ("f"   . e2wm:dp-array-move-right-command)
     ("b"   . e2wm:dp-array-move-left-command)
     ("p"   . e2wm:dp-array-move-up-command)
     ("n"   . e2wm:dp-array-move-down-command)
     ("C-f" . e2wm:dp-array-move-right-command)
     ("C-b" . e2wm:dp-array-move-left-command)
     ("C-p" . e2wm:dp-array-move-up-command)
     ("C-n" . e2wm:dp-array-move-down-command)
     ;;vi
     ("h"   . e2wm:dp-array-move-left-command)
     ("l"   . e2wm:dp-array-move-right-command)
     ("k"   . e2wm:dp-array-move-up-command)
     ("j"   . e2wm:dp-array-move-down-command)
     ;;choose
     ("q"   . e2wm:dp-array-cancel-command)
     ("C-m" . e2wm:dp-array-goto-prev-pst-command)
     ("C-g" . e2wm:dp-array-cancel-command)
     ))
    keymap))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; ### Setup

(e2wm:add-keymap
 e2wm:pst-minor-mode-keymap
 '(("prefix 1" . e2wm:dp-code)
   ("prefix 2" . e2wm:dp-two)
   ("prefix 3" . e2wm:dp-doc)
   ("prefix 4" . e2wm:dp-array)
   ("prefix 5" . e2wm:dp-dashboard))
 e2wm:prefix-key)

(defun e2wm:history-add-loaded-buffers ()
  "Put all recordable buffers in the history list."
  (interactive)
  (cl-loop for b in (buffer-list)
        for bo = (get-buffer b)
        if (e2wm:history-recordable-p bo)
        do (e2wm:history-add bo)))

(defvar e2wm:pre-start-hook nil "")
(defvar e2wm:post-start-hook nil "")

(defun e2wm:initialize-for-frame (pstset &optional not-pst-change)
  (if pstset
      (e2wm:pstset-define pstset)
    (e2wm:pstset-defaults)) ; use all registered perspectives
  (e2wm:pst-set-prev-pst nil)
    ;; show the first perspective in the perspective set
  (when (not not-pst-change)
    (e2wm:pst-change (car (e2wm:pstset-get-current-pstset)))))

;;;###autoload
(defun e2wm:start-management (&optional pstset force-restart not-pst-change)
  "Setup e2wm window management for the current frame.

To force restart use the universal prefix argument (C-u) or
specify non-nil for FORCE-RESTART when calling as a lisp function.

When the perspective change function `e2wm:pst-change' is called
before executing this initialization function, this function
would be called at `e2wm:pst-change'. Then, NOT-PST-CHANGE is not
`nil' in order to prevent infinite looping."
  (interactive)

  (when (or force-restart current-prefix-arg)
    (e2wm:stop-management t)
    (message "Restarting e2wm..."))

  (cond
   (e2wm:pst-minor-mode
    (if (e2wm:pst-get-instance)
        (message "E2wm has already started.")
      (e2wm:frame-param-set
       'e2wm-save-window-configuration
       (current-window-configuration))
      (e2wm:pst-minor-mode-enable-frame)
      (e2wm:initialize-for-frame pstset not-pst-change)))
   (t
    (run-hooks 'e2wm:pre-start-hook)

    (e2wm:frame-param-set
     'e2wm-save-window-configuration
     (current-window-configuration))

    (e2wm:history-add-loaded-buffers)
    (e2wm:history-save-backup nil)

    (e2wm:pst-minor-mode 1)
    (ad-activate-regexp "^e2wm:ad-debug" t) ; debug

    (e2wm:initialize-for-frame pstset not-pst-change)
    (e2wm:menu-define)

    (run-hooks 'e2wm:post-start-hook)
    (message "E2wm is started."))))

(defvar e2wm:post-stop-hook nil "")

(defun e2wm:stop-management (&optional force-stop)
  "Stop e2wm window management for the current frame.

To force stop, use the universal prefix argument (C-u) or
specify non-nil for FORCE-STOP when calling as a lisp function."
  (interactive)
  (setq force-stop (or current-prefix-arg force-stop))
  (when (or force-stop (e2wm:managed-p))
    (e2wm:pst-finish)
    (let ((other-frames (e2wm:other-managed-frames (selected-frame))))
      (if (and (not force-stop) other-frames)
          (e2wm:pst-minor-mode-disable-frame)
        ;; `other-frames' is non-nil when `force-stop' is `t'.
        ;; therefore, ignore errors here:
        (mapc (lambda (f) (ignore-errors (e2wm:pst-finish f)))
              other-frames)
        (e2wm:pst-minor-mode -1)
        (e2wm:pst-set-prev-pst nil)

        (ad-deactivate-regexp "^e2wm:ad-debug") ; debug

        (e2wm:aif (e2wm:frame-param-get
                   'e2wm-save-window-configuration)
            (set-window-configuration it))
        (run-hooks 'e2wm:post-stop-hook))))
  (when force-stop
    (message "E2wm is stopped forcefully.")))

;; for dev
;; (progn (setq e2wm:debug t) (toggle-debug-on-error))
;; (progn (kill-buffer (get-buffer-create "*e2wm:debug*")) (eval-buffer) (e2wm:start-management))
;; (e2wm:stop-management)

(provide 'e2wm)
;;; e2wm.el ends here