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TiddlyWiki5/core/modules/saver-handler.js

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/*\
title: $:/core/modules/saver-handler.js
type: application/javascript
module-type: global
The saver handler tracks changes to the store and handles saving the entire wiki via saver modules.
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
Instantiate the saver handler with the following options:
wiki: wiki to be synced
dirtyTracking: true if dirty tracking should be performed
*/
function SaverHandler(options) {
var self = this;
this.wiki = options.wiki;
this.dirtyTracking = options.dirtyTracking;
this.preloadDirty = options.preloadDirty || [];
this.pendingAutoSave = false;
// Make a logger
this.logger = new $tw.utils.Logger("saver-handler");
// Initialise our savers
if($tw.browser) {
this.initSavers();
}
// Only do dirty tracking if required
if($tw.browser && this.dirtyTracking) {
// Compile the dirty tiddler filter
this.filterFn = this.wiki.compileFilter(this.wiki.getTiddlerText(this.titleSyncFilter));
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// Count of changes that have not yet been saved
var filteredChanges = self.filterFn.call(self.wiki,function(iterator) {
$tw.utils.each(self.preloadDirty,function(title) {
var tiddler = self.wiki.getTiddler(title);
iterator(tiddler,title);
});
});
this.numChanges = filteredChanges.length;
// Listen out for changes to tiddlers
this.wiki.addEventListener("change",function(changes) {
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// Filter the changes so that we only count changes to tiddlers that we care about
var filteredChanges = self.filterFn.call(self.wiki,function(iterator) {
$tw.utils.each(changes,function(change,title) {
var tiddler = self.wiki.getTiddler(title);
iterator(tiddler,title);
});
});
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// Adjust the number of changes
self.numChanges += filteredChanges.length;
self.updateDirtyStatus();
// Do any autosave if one is pending and there's no more change events
if(self.pendingAutoSave && self.wiki.getSizeOfTiddlerEventQueue() === 0) {
// Check if we're dirty
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if(self.numChanges > 0) {
self.saveWiki({
method: "autosave",
downloadType: "text/plain"
});
}
self.pendingAutoSave = false;
}
});
// Listen for the autosave event
$tw.rootWidget.addEventListener("tm-auto-save-wiki",function(event) {
// Do the autosave unless there are outstanding tiddler change events
if(self.wiki.getSizeOfTiddlerEventQueue() === 0) {
// Check if we're dirty
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if(self.numChanges > 0) {
self.saveWiki({
method: "autosave",
downloadType: "text/plain"
});
}
} else {
// Otherwise put ourselves in the "pending autosave" state and wait for the change event before we do the autosave
self.pendingAutoSave = true;
}
});
// Set up our beforeunload handler
$tw.addUnloadTask(function(event) {
var confirmationMessage;
if(self.isDirty()) {
confirmationMessage = $tw.language.getString("UnsavedChangesWarning");
event.returnValue = confirmationMessage; // Gecko
}
return confirmationMessage;
});
}
// Install the save action handlers
if($tw.browser) {
$tw.rootWidget.addEventListener("tm-save-wiki",function(event) {
self.saveWiki({
wiki: event.widget.wiki,
template: event.param,
downloadType: "text/plain",
variables: event.paramObject
});
});
$tw.rootWidget.addEventListener("tm-download-file",function(event) {
self.saveWiki({
wiki: event.widget.wiki,
method: "download",
template: event.param,
downloadType: "text/plain",
variables: event.paramObject
});
});
}
}
SaverHandler.prototype.titleSyncFilter = "$:/config/SaverFilter";
SaverHandler.prototype.titleAutoSave = "$:/config/AutoSave";
SaverHandler.prototype.titleSavedNotification = "$:/language/Notifications/Save/Done";
/*
Select the appropriate saver modules and set them up
*/
SaverHandler.prototype.initSavers = function(moduleType) {
moduleType = moduleType || "saver";
// Instantiate the available savers
this.savers = [];
var self = this;
$tw.modules.forEachModuleOfType(moduleType,function(title,module) {
if(module.canSave(self)) {
self.savers.push(module.create(self.wiki));
}
});
// Sort the savers into priority order
this.savers.sort(function(a,b) {
if(a.info.priority < b.info.priority) {
return -1;
} else {
if(a.info.priority > b.info.priority) {
return +1;
} else {
return 0;
}
}
});
};
/*
Save the wiki contents. Options are:
method: "save", "autosave" or "download"
template: the tiddler containing the template to save
downloadType: the content type for the saved file
wiki: optional wiki, overriding the default wiki specified in the constructor
*/
SaverHandler.prototype.saveWiki = function(options) {
options = options || {};
var self = this,
wiki = options.wiki || this.wiki,
method = options.method || "save";
// Ignore autosave if disabled
if(method === "autosave" && ($tw.config.disableAutoSave || wiki.getTiddlerText(this.titleAutoSave,"yes") !== "yes")) {
return false;
}
var variables = options.variables || {},
Fix faulty external-js single-file wiki (#5570) * Fix problems with building single-file wiki using external-js template * core/templates/external-js/tiddlywiki5-external-js.html.tid, core/templates/external-js/save-all-external-js.tid, core/templates/external-js/save-offline-external-js.tid core/templates/external-js/load-external-js.tid: Fix #5343. Exclude client-server plugins in tiddler imports and to specify a working URL for loading tiddlywiki5.js from local disk. Mirror save/all and save/offline templates in the regular server edition. Fix #4717 (tiddlywiki5-external-js.html.tid) * core/modules/saver-handler.js: Need the change to make single file autosave work with the external-js template. * editions/server-external-js/tiddlywiki.info: Provide external-js related build targets. * core/language/en-GB/Snippets/ExtJSReadme.tid: Temporary doc to supplement TW5.com's external-js section. Demonstrate that upgrade could be done on single-file wikis with an externalized TW core. * core/language/en-GB/Snippets/GetTiddlyWikiJS.tid: Documentation. Meant to be included in every wiki and to help end users acquire tiddlywiki5.js. * Pre-configure save-wiki template for end-users * Remove the newline character at the end of the file. * Trim "template" value in saveWiki() * Safeguard the code from extraneous whitespaces in transcluded result. * Rename and add versioning to downloaded tiddlywiki core JS * Rename "tiddlywiki5.js" to "twcore-VERSION.js" * Preload $:/config/SaveWikiButton/Template tiddler with the required external-js template value. * Update external-js user documentation * Add "download tiddlywiki core JS" menu item to the "cloud" button. * Update build's target defintions associated with external-js template. * Move the user doc to the tw5.com edition. * Coding style update * Undo template name changes * Correct text & fill colors on some disabled buttons * Add new "export tiddlywiki core" button under page control tools This new button can export tiddlywiki's core JS from user's wiki as long as the wiki is served with the regular "root" template. The button will be ineffective, thus disabled, if the core has already been externalized by the "external-js" template. With this button, a full standalone html wiki can obtain the matching core JS without TiddlyWiki on node.js. Once this is done, the html wiki can be converted to using the "external-js" template. * Alternate version of "save tiddlywiki core for offline use" This version will fire up a "Save File" dialogue box when clicked, instead of directing the user to a helper doc for further instruction. It achieves this by using the "download" attribute of the <a> html tag. It works on most modern desktop browsers, but older browsers (e.g. IE) may display the file instead. * Adjust font-weight to match other menu items * Merge two user documentations into one * Add user-browser-cache=yes to --listen command * Update "export tiddlywiki core" button hint * Simpler implementation for switching btw online/offline core URL Shave off one template by using filtered transclusion to control online/offline core URL. * Update user doc Update the user doc to clarify that build index step is not needed to initialize a new wiki. * Rename twcore to tiddlywikicore * Reformat the user doc * Rework export-tiddlywikicore button Popup an error message instead of disabling the button when export core cannot be performed. * Revert "Correct text & fill colors on some disabled buttons" This reverts commit e7dbb7e712e5cd23e57ec068b9fe9ed3bbaf4617.
2021-07-06 14:02:21 +00:00
template = (options.template ||
wiki.getTiddlerText("$:/config/SaveWikiButton/Template","$:/core/save/all")).trim(),
downloadType = options.downloadType || "text/plain",
text = wiki.renderTiddler(downloadType,template,options),
callback = function(err) {
if(err) {
alert($tw.language.getString("Error/WhileSaving") + ":\n\n" + err);
} else {
// Clear the task queue if we're saving (rather than downloading)
if(method !== "download") {
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self.numChanges = 0;
self.updateDirtyStatus();
}
$tw.notifier.display(self.titleSavedNotification);
if(options.callback) {
options.callback();
}
}
};
// Call the highest priority saver that supports this method
for(var t=this.savers.length-1; t>=0; t--) {
var saver = this.savers[t];
if(saver.info.capabilities.indexOf(method) !== -1 && saver.save(text,method,callback,{variables: {filename: variables.filename}})) {
this.logger.log("Saving wiki with method",method,"through saver",saver.info.name);
return true;
}
}
return false;
};
/*
Checks whether the wiki is dirty (ie the window shouldn't be closed)
*/
SaverHandler.prototype.isDirty = function() {
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return this.numChanges > 0;
};
/*
Update the document body with the class "tc-dirty" if the wiki has unsaved/unsynced changes
*/
SaverHandler.prototype.updateDirtyStatus = function() {
var self = this;
if($tw.browser) {
$tw.utils.toggleClass(document.body,"tc-dirty",this.isDirty());
$tw.utils.each($tw.windows,function(win) {
$tw.utils.toggleClass(win.document.body,"tc-dirty",self.isDirty());
});
}
};
exports.SaverHandler = SaverHandler;
})();