mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-08-30 04:52:46 +00:00
132 lines
4.0 KiB
JavaScript
132 lines
4.0 KiB
JavaScript
/*\
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title: $:/plugins/tiddlywiki/browser-storage/startup.js
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type: application/javascript
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module-type: startup
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Startup initialisation
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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// Export name and synchronous status
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exports.name = "browser-storage";
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exports.platforms = ["browser"];
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exports.after = ["startup"];
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exports.synchronous = true;
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var ENABLED_TITLE = "$:/config/BrowserStorage/Enabled",
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SAVE_FILTER_TITLE = "$:/config/BrowserStorage/SaveFilter",
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QUOTA_EXCEEDED_ALERT_TITLE = "$:/config/BrowserStorage/QuotaExceededAlert",
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DEFAULT_QUOTA_EXCEEDED_ALERT_PREFIX = "Quota exceeded attempting to store `",
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DEFAULT_QUOTA_EXCEEDED_ALERT_SUFFIX = "` in browser local storage";
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exports.startup = function() {
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var self = this;
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// Compute our prefix for local storage keys
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var prefix = "tw5#" + window.location.pathname + "#";
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// Make a logger
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var logger = new $tw.utils.Logger("browser-storage",{
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colour: "cyan"
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});
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// Function to compile the filter
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var filterFn,
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compileFilter = function() {
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filterFn = $tw.wiki.compileFilter($tw.wiki.getTiddlerText(SAVE_FILTER_TITLE));
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}
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compileFilter();
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// Listen for tm-clear-browser-storage messages
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$tw.rootWidget.addEventListener("tm-clear-browser-storage",function(event) {
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$tw.wiki.addTiddler({title: ENABLED_TITLE, text: "no"});
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clearLocalStorage();
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});
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// Track tiddler changes
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$tw.wiki.addEventListener("change",function(changes) {
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// Bail if browser storage is disabled
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if($tw.wiki.getTiddlerText(ENABLED_TITLE) === "no") {
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return;
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}
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// Recompile the filter if it has changed
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if(changes[SAVE_FILTER_TITLE]) {
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compileFilter();
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}
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// Filter the changes
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var filteredChanges = filterFn.call($tw.wiki,function(iterator) {
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$tw.utils.each(changes,function(change,title) {
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var tiddler = $tw.wiki.getTiddler(title);
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iterator(tiddler,title);
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});
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});
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$tw.utils.each(filteredChanges,function(title) {
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// Don't try to save changes to our enabled status
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// (If it were enabled in the file but disabled in local storage then we might not realise that distributing a copy of the file would have local storage enabled for other users)
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if(title === ENABLED_TITLE) {
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return;
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}
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// Save the tiddler
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saveTiddlerToLocalStorage(title,{
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logger: logger,
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prefix: prefix
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});
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});
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});
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};
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function saveTiddlerToLocalStorage(title,options) {
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options = options || {};
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// Get the tiddler
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var tiddler = $tw.wiki.getTiddler(title);
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if(tiddler) {
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console.log("browser-storage: Saving",title);
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// Get the JSON of the tiddler
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var json = JSON.stringify(tiddler.getFieldStrings());
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// Try to save it to local storage
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try {
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window.localStorage.setItem(options.prefix + title,json);
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} catch(e) {
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if(e.name === "QuotaExceededError") {
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// Complain if we failed
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var msg = $tw.wiki.getTiddlerText(QUOTA_EXCEEDED_ALERT_TITLE,DEFAULT_QUOTA_EXCEEDED_ALERT_PREFIX + title + DEFAULT_QUOTA_EXCEEDED_ALERT_SUFFIX);
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if(options.logger) {
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options.logger.alert(msg);
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}
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// No point in keeping old values around for this tiddler
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window.localStorage.removeItem(options.prefix + title);
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} else {
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console.log("Browser-storage error:",e);
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}
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}
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} else {
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// In local storage, use the special value of empty string to mark the tiddler as deleted
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// On future page loads, if the tiddler is already gone from startup then the blank entry
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// will be removed from localstorage. Otherwise, the tiddler will be deleted.
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console.log("browser-storage: Blanking",title);
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try {
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window.localStorage.setItem(options.prefix + title, "");
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} catch(e) {
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console.log("Browser-storage error:",e);
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}
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}
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}
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function clearLocalStorage() {
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var url = window.location.pathname,
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log = [];
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// Step through each browser storage item
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if(window.localStorage) {
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for(var index=window.localStorage.length - 1; index>=0; index--) {
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var key = window.localStorage.key(index),
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parts = key.split("#");
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// Delete it if it is ours
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if(parts[0] === "tw5" && parts[1] === url) {
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window.localStorage.removeItem(key);
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}
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}
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}
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}
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})();
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