Fix raising filenotfounderror (#44)

impose/data.py

@@ -2,6 +2,7 @@
 from collections import OrderedDict
 import copy
 import pathlib
+import errno
 
 import numpy as np
 
@@ -84,7 +85,11 @@ def __setstate__(self, state):
     def _initialize_from_path(self, path):
         self.path = pathlib.Path(path).resolve()
         if not self.path.exists():
-            raise FileNotFoundError(f"File does not exist: '{self.path}'")
+            raise FileNotFoundError(
+                errno.ENOENT,
+                f"File does not exist: '{self.path}'",
+                self.path
+            )
         # extract the data and metadata
         data_channels, meta_orig = load(path)
         self.data_channels = data_channels

impose/gui/main.py

@@ -82,17 +82,18 @@ def on_session_open(self):
                         QtWidgets.QMessageBox.warning(
                             self,
                             "Data file location unknown",
-                            f"At least one file ({e.name}) could not be found "
-                            "on this machine. In the following dialog(s), "
-                            "please select the location(s) of the missing "
-                            "file(s). The search is done recursively "
-                            "(including subdirectories)."
+                            f"At least one file ({e.filename}) could not be "
+                            "found on this machine. In the following "
+                            "dialog(s), please select the location(s) of "
+                            "the missing file(s). The search is done "
+                            "recursively (including subdirectories)."
                         )
                         initial_dialog_shown = True
                     # Let the user choose another search path
                     sdir = QtWidgets.QFileDialog.getExistingDirectory(
                         self,
-                        f"Please select directory tree containing '{e.name}'!"
+                        "Please select directory tree "
+                        f"containing '{e.filename}'!"
                     )
                     if sdir:
                         search_paths.append(sdir)

impose/session.py

@@ -1,6 +1,7 @@
 import json
 import pathlib
 import warnings
+import errno
 
 import numpy as np
 
@@ -12,8 +13,7 @@
 
 
 class ImposeDataFileNotFoundError(FileNotFoundError):
-    def __init__(self, name, *args, **kwargs):
-        self.name = name
+    def __init__(self, *args, **kwargs):
         super(ImposeDataFileNotFoundError, self).__init__(*args, **kwargs)
 
 
@@ -277,10 +277,11 @@ def find_file(name, search_paths, signature=None):
                     return pp
         else:
             raise ImposeDataFileNotFoundError(
-                name,
+                errno.ENOENT,
                 "Could not find file '{}'".format(name)
                 + (f" (sig '{signature}')" if signature is not None else "")
-                + "!"
+                + "!",
+                name
             )
 
     def clear(self):