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TiddlyStow.html
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<html>
<head>
<title>TiddlyStow - 使用浏览器文件系统api本地存储TiddlyWiki文件</title>
<script type="module">
/* From https://github.com/jakearchibald/idb-keyval */
/* Retreived 2020-04-10 */
let idbKeyval = (function (exports) {
'use strict';
class Store {
constructor(dbName = 'keyval-store', storeName = 'keyval') {
this.storeName = storeName;
this._dbp = new Promise((resolve, reject) => {
const openreq = indexedDB.open(dbName, 1);
openreq.onerror = () => reject(openreq.error);
openreq.onsuccess = () => resolve(openreq.result);
// First time setup: create an empty object store
openreq.onupgradeneeded = () => {
openreq.result.createObjectStore(storeName);
};
});
}
_withIDBStore(type, callback) {
return this._dbp.then(db => new Promise((resolve, reject) => {
const transaction = db.transaction(this.storeName, type);
transaction.oncomplete = () => resolve();
transaction.onabort = transaction.onerror = () => reject(transaction.error);
callback(transaction.objectStore(this.storeName));
}));
}
}
let store;
function getDefaultStore() {
if (!store)
store = new Store();
return store;
}
function get(key, store = getDefaultStore()) {
let req;
return store._withIDBStore('readonly', store => {
req = store.get(key);
}).then(() => req.result);
}
function set(key, value, store = getDefaultStore()) {
return store._withIDBStore('readwrite', store => {
store.put(value, key);
});
}
function del(key, store = getDefaultStore()) {
return store._withIDBStore('readwrite', store => {
store.delete(key);
});
}
function clear(store = getDefaultStore()) {
return store._withIDBStore('readwrite', store => {
store.clear();
});
}
function keys(store = getDefaultStore()) {
const keys = [];
return store._withIDBStore('readonly', store => {
// This would be store.getAllKeys(), but it isn't supported by Edge or Safari.
// And openKeyCursor isn't supported by Safari.
(store.openKeyCursor || store.openCursor).call(store).onsuccess = function () {
if (!this.result)
return;
keys.push(this.result.key);
this.result.continue();
};
}).then(() => keys);
}
exports.Store = Store;
exports.get = get;
exports.set = set;
exports.del = del;
exports.clear = clear;
exports.keys = keys;
return exports;
}({}));
/*
* Returns a function which can be used as a TiddlyWiki saver.
* The saver will write the given text to the given fileHandle
*/
function createTwCustomSaver(fileHandle) {
return function(text, method, callback) {
fileHandle.createWritable()
.then(writable => {
writable.write(text);
return writable;
}).then(writable => {
writable.close();
callback(null);
}).catch(error => {
callback(error);
});
return true;
}
}
/* This saver is used when a local file is opened from disk */
function setTwCustomSaver(fileHandle) {
// Tiddlywiki Version 5.1.23 introduced the "custom saver" which will call
// a window.$tw.customSaver.save function from its current frame
// or parent frame.
window.$tw = {customSaver: {save: createTwCustomSaver(fileHandle)}};
}
/*
* This "SaveAs" saver is used when new wiki is loaded from url.
* The user is not prompted for a file to save to until the first save
*/
function setTwCustomSaveAsSaver() {
let writeTw;
let save = function(text, method, callback) {
if (writeTw) {
writeTw(text, method, callback);
} else {
// writeTw function is empty, so prompt the user for file handle
// and create the writeTw function
window.showSaveFilePicker()
.then(fileHandle => {
writeTw = createTwCustomSaver(fileHandle);
writeTw(text, method, callback);
twFileManager.addRecent(fileHandle);
});
}
return true;
}
window.$tw = {customSaver: {save: save}};
}
const twFileManager = {
openFile: async function(fileHandle) {
if (fileHandle) {
// fileHandle may have come from indexDB in which case permission must be re-queried
const options = {mode: 'read'};
if ((await fileHandle.queryPermission(options)) !== 'granted') {
await fileHandle.requestPermission(options);
}
} else {
// No fileHandle given. Prompt user to choose one from disk
[fileHandle] = await window.showOpenFilePicker();
}
const file = await fileHandle.getFile();
const contents = await file.text();
setTwCustomSaver(fileHandle);
return {fileHandle, contents};
},
openFromUrl: async function(url) {
const contents = await fetch(url).then(res => res.text());
setTwCustomSaveAsSaver();
return {contents};
},
/* This code modified from https://github.com/GoogleChromeLabs/text-editor/blob/main/src/inline-scripts/menu-recent.js */
/* as retrieved on 2022/03/20 */
/*
* File handles can be serialized, but only to IndexDB. Localstorage is not supported.
*/
addRecent: async function(fileHandle) {
let recentFiles = (await idbKeyval.get('recentFiles')) || [];
// If isSameEntry isn't available, we can't store the file handle
if (!fileHandle.isSameEntry) {
console.warn('不能保存最近的数据。');
return recentFiles;
}
// Loop through the list of recent files and make sure the file we're
// adding isn't already there. This is gross.
const inList = await Promise.all(recentFiles.map((f) => {
return fileHandle.isSameEntry(f);
}));
if (inList.some((val) => val)) {
return recentFiles;
}
// Add the new file handle to the top of the list, and remove any old ones.
recentFiles.unshift(fileHandle);
if (recentFiles.length > 5) {
recentFiles.pop();
}
// Save the list of recent files.
idbKeyval.set('recentFiles', recentFiles);
return recentFiles;
},
getRecent: async function () {
return (await idbKeyval.get('recentFiles')) || [];
},
clearRecent: async function () {
await idbKeyval.del('recentFiles');
}
}
// Allow indexdb to be disabled
if (window.location.hash.search("norecent") >= 0) {
const noop = async () => {return []};
twFileManager.addRecent = noop;
twFileManager.getRecent = noop;
}
// Prevent errors if the browser doesn't support file system api
if (!window.showOpenFilePicker) {
twFileManager.openFile = async () => {
window.alert("此浏览器不支持打开文件");
return {}
}
}
if (!window.showSaveFilePicker) {
setTwCustomSaveAsSaver = () => {}
}
function replacePageContents(contents) {
if (contents) {
document.open();
document.write(contents);
document.close();
}
}
window.openFile = async function (fileHandle) {
const file = await twFileManager.openFile(fileHandle);
replacePageContents(file.contents);
if (file.fileHandle) {
twFileManager.addRecent(file.fileHandle);
}
return file;
}
window.openFromUrl = async function (url) {
const file = await twFileManager.openFromUrl(url);
replacePageContents(file.contents);
return file;
}
function displayBrowserSupportMessage() {
const elem = document.getElementById("support-message");
if (elem) {
elem.innerHTML = window.showSaveFilePicker ?
"<b>好消息！你的浏览器支持它。</b>" :
"<b>抱歉！您的浏览器不支持它。</b>"
}
}
function clearRecent() {
twFileManager.clearRecent().then(() => {
const elem = document.getElementById("recent-files");
if (elem) {
elem.innerText = "";
}
});
}
function displayRecentFiles() {
const elem = document.getElementById("recent-files");
if (elem) {
twFileManager.getRecent().
then(recentFiles => {
if (recentFiles && recentFiles.length > 0) {
const list = document.createElement('ul');
for (const recent of recentFiles) {
const li = document.createElement('li'),
button = Object.assign(document.createElement('button'), {
type: 'button',
onclick: openFile.bind(null, recent),
innerText: recent.name
});
li.appendChild(button);
list.appendChild(li);
}
const clearButton = Object.assign(document.createElement('button'), {
type: 'button',
onclick: clearRecent,
innerText: '清除最近的文件列表'
});
elem.innerText = '从最近使用过的文件开始：';
elem.appendChild(list);
elem.appendChild(clearButton);
}
})
}
}
window.onload = () => {
displayBrowserSupportMessage();
displayRecentFiles();
}
</script>
</head>
<body>
<div>
<h1>TiddlyStow</h1>
<p>这个简单的页面是加载本地程序的助手 <a href="https://tiddlywiki.com">TiddlyWiki</a>
文件并将其存储到相同的本地文件。</p>
<ul>
<li>在这里打开任何文件之前，请确保有一个备份!</li>
<li>一定要经常备份你的文件!</li>
<li>
并不是所有的浏览器都 <a href="https://caniuse.com/native-filesystem-api">支持本地文件特性</a>.
<span id="support-message"></span>
</li>
<li>仅适用于单个文件TiddlyWiki实例。</li>
<li>不喜欢在浏览器存储中保存最近的文件列表?点击 <a href="#norecent">这里</a> 并刷新页面。</li>
<li><a href="https://github.com/slaymaker1907/TW5-browser-nativesaver">TW5 browser nativesaver</a> 是一个类似的项目，但有更多的功能，并捆绑为TiddlyWiki插件。</li>
<li>源代码可在 <a href="https://github.com/btheado/tiddlystow">Github</a> 或者在浏览器中使用“查看页面源代码”。</li>
<li>加载Tiddlywiki文件后，刷新页面返回到文件选择器。</li>
</ul>
</p>
<br>
<button type="button" onclick="openFile()">从本地打开现有的文件...</button>
<div id="recent-files"></div><br>
<div>
从远程url打开新的wiki:
<ul>
<li><button type="button" onclick="openFromUrl('https://tiddlywiki.com/empty.html')">tiddlywiki.com/empty.html</button></li>
<li><button type="button" onclick="openFromUrl('https://tiddlywiki.com/prerelease')">tiddlywiki.com/prerelease</button></li>
</ul>
</div>
</div>
</body>
</html>