mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-08-18 19:59:25 +00:00
150 lines
4.3 KiB
JavaScript
150 lines
4.3 KiB
JavaScript
/*\
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title: js/LocalFileSync.js
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Loads tiddlers from a given directory, and then keeps the files up to date as tiddlers are modified, created or deleted.
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\*/
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(function(){
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/*jslint node: true */
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"use strict";
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var retrieveFile = require("./FileRetriever.js").retrieveFile,
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utils = require("./Utils.js"),
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fs = require("fs"),
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path = require("path"),
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url = require("url"),
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util = require("util"),
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async = require("async");
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function LocalFileSync(dirpath,store,callback) {
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this.dirpath = dirpath;
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this.store = store;
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this.callback = callback;
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this.tiddlers = {}; // A hashmap of <tiddlername>: {changeCount: <changeCount>, files: [name]}
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var self = this,
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sanitizeFilepath = function(filepath) {
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return filepath.replace(/\//mg,"-");
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};
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// Set up a queue for loading tiddler files, tasks are {filepath:,callback:}
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this.loadQueue = async.queue(function(task,callback) {
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task.files = [];
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retrieveFile(task.filepath,self.dirpath,function(err,data) {
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if(err) {
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callback(err);
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} else {
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task.files.push(task.filepath);
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// Use the filepath as the default title for the tiddler
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var fields = {
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title: data.path
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};
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var tiddlers = self.store.deserializeTiddlers(data.extname,data.text,fields);
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// Check for the .meta file
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if(data.extname !== ".json" && tiddlers.length === 1) {
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var metafile = task.filepath + ".meta";
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retrieveFile(metafile,self.dirpath,function(err,data) {
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if(err && err.code !== "ENOENT" && err.code !== "404") {
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callback(err);
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} else {
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task.files.push(metafile);
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var fields = tiddlers[0];
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if(!err) {
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var text = data.text.split("\n\n")[0];
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if(text) {
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fields = self.store.deserializeTiddlers("application/x-tiddler",text,fields)[0];
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}
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}
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task.callback(task,[fields]);
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callback(null);
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}
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});
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} else {
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task.callback(task,tiddlers);
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callback(null);
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}
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}
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});
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},10);
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// Call the callback when all the files are loaded
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this.loadQueue.drain = function() {
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callback(null);
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};
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// Query the folder content to get all the tiddlers
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fs.readdir(this.dirpath,function(err,files) {
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if(err) {
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callback(err);
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} else {
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var loadCallback = function(task,tiddlers) {
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for(var t=0; t<tiddlers.length; t++) {
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var tiddler = tiddlers[t];
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self.store.addTiddler(tiddler);
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self.tiddlers[tiddler.title] = {
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changeCount: self.store.getChangeCount(tiddler.title),
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files: task.files
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};
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}
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};
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for(var t=0; t<files.length; t++) {
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var f = files[t];
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if(["..",".",".DS_Store"].indexOf(f) === -1 && f.indexOf(".meta") !== f.length-5) {
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self.loadQueue.push({
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filepath: f,
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callback: loadCallback
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});
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}
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}
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}
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});
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// Set up a queue for saving tiddler files
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this.saveQueue = async.queue(function(task,callback) {
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var data = task.data,
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encoding = "utf8";
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if(task.binary) {
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data = new Buffer(task.data,"base64").toString("binary");
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encoding = "binary";
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}
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fs.writeFile(self.dirpath + "/" + task.name,data,encoding,function(err) {
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callback(err);
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});
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},10);
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// Install our event listener to listen out for tiddler changes
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this.store.addEventListener("",function(changes) {
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var t;
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for(var title in changes) {
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// Get the information about the tiddler
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var tiddler = self.store.getTiddler(title),
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changeCount = self.store.getChangeCount(title),
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tiddlerInfo = self.tiddlers[title],
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files = [];
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if(tiddler) {
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// Construct a changecount record if we don't have one
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if(!tiddlerInfo) {
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tiddlerInfo = {changeCount: 0, files: []};
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self.tiddlers[title] = tiddlerInfo;
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}
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// Save the tiddler if the changecount has increased
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if(changeCount > tiddlerInfo.changeCount) {
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files = self.store.serializeTiddlers([tiddler],"application/x-tiddler");
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for(t=0; t<files.length; t++) {
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files[t].name = sanitizeFilepath(files[t].name);
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tiddlerInfo.files.push(files[t].name);
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self.saveQueue.push(files[t]);
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}
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}
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} else {
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// Delete the tiddler file if the tiddler has gone
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if(tiddlerInfo) {
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for(t=0; t<tiddlerInfo.files.length; t++) {
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fs.unlink(self.dirpath + "/" + tiddlerInfo.files[t]);
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}
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delete self.tiddlers[title];
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}
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}
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}
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});
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}
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exports.LocalFileSync = LocalFileSync;
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})();
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