485 lines
15 KiB
JavaScript
485 lines
15 KiB
JavaScript
/*\
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title: $:/core/modules/utils/filesystem.js
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type: application/javascript
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module-type: utils-node
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File system utilities
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var fs = require("fs"),
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path = require("path");
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/*
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Return the subdirectories of a path
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*/
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exports.getSubdirectories = function(dirPath) {
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if(!$tw.utils.isDirectory(dirPath)) {
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return null;
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}
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var subdirs = [];
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$tw.utils.each(fs.readdirSync(dirPath),function(item) {
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if($tw.utils.isDirectory(path.resolve(dirPath,item))) {
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subdirs.push(item);
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}
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});
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return subdirs;
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}
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/*
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Recursively (and synchronously) copy a directory and all its content
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*/
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exports.copyDirectory = function(srcPath,dstPath) {
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// Remove any trailing path separators
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srcPath = path.resolve($tw.utils.removeTrailingSeparator(srcPath));
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dstPath = path.resolve($tw.utils.removeTrailingSeparator(dstPath));
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// Check that neither director is within the other
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if(srcPath.substring(0,dstPath.length) === dstPath || dstPath.substring(0,srcPath.length) === srcPath) {
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return "Cannot copy nested directories";
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}
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// Create the destination directory
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var err = $tw.utils.createDirectory(dstPath);
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if(err) {
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return err;
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}
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// Function to copy a folder full of files
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var copy = function(srcPath,dstPath) {
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var srcStats = fs.lstatSync(srcPath),
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dstExists = fs.existsSync(dstPath);
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if(srcStats.isFile()) {
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$tw.utils.copyFile(srcPath,dstPath);
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} else if(srcStats.isDirectory()) {
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var items = fs.readdirSync(srcPath);
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for(var t=0; t<items.length; t++) {
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var item = items[t],
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err = copy(srcPath + path.sep + item,dstPath + path.sep + item);
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if(err) {
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return err;
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}
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}
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}
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};
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copy(srcPath,dstPath);
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return null;
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};
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/*
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Copy a file
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*/
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var FILE_BUFFER_LENGTH = 64 * 1024,
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fileBuffer;
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exports.copyFile = function(srcPath,dstPath) {
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// Create buffer if required
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if(!fileBuffer) {
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fileBuffer = Buffer.alloc(FILE_BUFFER_LENGTH);
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}
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// Create any directories in the destination
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$tw.utils.createDirectory(path.dirname(dstPath));
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// Copy the file
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var srcFile = fs.openSync(srcPath,"r"),
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dstFile = fs.openSync(dstPath,"w"),
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bytesRead = 1,
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pos = 0;
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while (bytesRead > 0) {
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bytesRead = fs.readSync(srcFile,fileBuffer,0,FILE_BUFFER_LENGTH,pos);
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fs.writeSync(dstFile,fileBuffer,0,bytesRead);
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pos += bytesRead;
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}
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fs.closeSync(srcFile);
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fs.closeSync(dstFile);
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return null;
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};
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/*
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Remove trailing path separator
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*/
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exports.removeTrailingSeparator = function(dirPath) {
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var len = dirPath.length;
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if(dirPath.charAt(len-1) === path.sep) {
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dirPath = dirPath.substr(0,len-1);
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}
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return dirPath;
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};
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/*
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Recursively create a directory
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*/
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exports.createDirectory = function(dirPath) {
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if(dirPath.substr(dirPath.length-1,1) !== path.sep) {
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dirPath = dirPath + path.sep;
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}
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var pos = 1;
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pos = dirPath.indexOf(path.sep,pos);
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while(pos !== -1) {
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var subDirPath = dirPath.substr(0,pos);
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if(!$tw.utils.isDirectory(subDirPath)) {
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try {
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fs.mkdirSync(subDirPath);
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} catch(e) {
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return "Error creating directory '" + subDirPath + "'";
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}
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}
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pos = dirPath.indexOf(path.sep,pos + 1);
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}
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return null;
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};
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/*
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Recursively create directories needed to contain a specified file
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*/
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exports.createFileDirectories = function(filePath) {
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return $tw.utils.createDirectory(path.dirname(filePath));
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};
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/*
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Recursively delete a directory
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*/
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exports.deleteDirectory = function(dirPath) {
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if(fs.existsSync(dirPath)) {
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var entries = fs.readdirSync(dirPath);
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for(var entryIndex=0; entryIndex<entries.length; entryIndex++) {
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var currPath = dirPath + path.sep + entries[entryIndex];
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if(fs.lstatSync(currPath).isDirectory()) {
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$tw.utils.deleteDirectory(currPath);
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} else {
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fs.unlinkSync(currPath);
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}
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}
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fs.rmdirSync(dirPath);
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}
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return null;
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};
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/*
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Check if a path identifies a directory
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*/
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exports.isDirectory = function(dirPath) {
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return fs.existsSync(dirPath) && fs.statSync(dirPath).isDirectory();
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};
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/*
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Check if a path identifies a directory that is empty
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*/
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exports.isDirectoryEmpty = function(dirPath) {
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if(!$tw.utils.isDirectory(dirPath)) {
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return false;
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}
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var files = fs.readdirSync(dirPath),
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empty = true;
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$tw.utils.each(files,function(file,index) {
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if(file.charAt(0) !== ".") {
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empty = false;
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}
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});
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return empty;
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};
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/*
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Recursively delete a tree of empty directories
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*/
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exports.deleteEmptyDirs = function(dirpath,callback) {
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var self = this;
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fs.readdir(dirpath,function(err,files) {
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if(err) {
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return callback(err);
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}
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if(files.length > 0) {
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return callback(null);
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}
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fs.rmdir(dirpath,function(err) {
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if(err) {
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return callback(err);
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}
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self.deleteEmptyDirs(path.dirname(dirpath),callback);
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});
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});
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};
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/*
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Create a fileInfo object for saving a tiddler:
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filepath: the absolute path to the file containing the tiddler
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type: the type of the tiddler file on disk (NOT the type of the tiddler)
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hasMetaFile: true if the file also has a companion .meta file
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Options include:
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directory: absolute path of root directory to which we are saving
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pathFilters: optional array of filters to be used to generate the base path
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extFilters: optional array of filters to be used to generate the base path
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wiki: optional wiki for evaluating the pathFilters,
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fileInfo: an existing fileInfo to check against
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*/
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exports.generateTiddlerFileInfo = function(tiddler,options) {
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var fileInfo = {}, metaExt;
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// Check if the tiddler has any unsafe fields that can't be expressed in a .tid or .meta file: containing control characters, or leading/trailing whitespace
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var hasUnsafeFields = false;
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$tw.utils.each(tiddler.getFieldStrings(),function(value,fieldName) {
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if(fieldName !== "text") {
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hasUnsafeFields = hasUnsafeFields || /[\x00-\x1F]/mg.test(value);
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hasUnsafeFields = hasUnsafeFields || ($tw.utils.trim(value) !== value);
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}
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});
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// Check for field values
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if(hasUnsafeFields) {
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// Save as a JSON file
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fileInfo.type = "application/json";
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fileInfo.hasMetaFile = false;
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} else {
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// Save as a .tid or a text/binary file plus a .meta file
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var tiddlerType = tiddler.fields.type || "text/vnd.tiddlywiki";
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if(tiddlerType === "text/vnd.tiddlywiki") {
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// Save as a .tid file
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fileInfo.type = "application/x-tiddler";
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fileInfo.hasMetaFile = false;
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} else {
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// Save as a text/binary file and a .meta file
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fileInfo.type = tiddlerType;
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fileInfo.hasMetaFile = true;
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}
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if(options.extFilters) {
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// Check for extension override
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metaExt = $tw.utils.generateTiddlerExtension(tiddler.fields.title,{
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extFilters: options.extFilters,
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wiki: options.wiki
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});
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if(metaExt === ".tid") {
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// Overriding to the .tid extension needs special handling
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fileInfo.type = "application/x-tiddler";
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fileInfo.hasMetaFile = false;
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} else if (metaExt === ".json") {
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// Overriding to the .json extension needs special handling
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fileInfo.type = "application/json";
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fileInfo.hasMetaFile = false;
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} else if (metaExt) {
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//If the new type matches a known extention, use that MIME type's encoding
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var extInfo = $tw.utils.getFileExtensionInfo(metaExt);
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fileInfo.type = extInfo ? extInfo.type : null;
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fileInfo.encoding = $tw.utils.getTypeEncoding(metaExt);
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fileInfo.hasMetaFile = true;
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}
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}
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}
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// Take the file extension from the tiddler content type or metaExt
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var contentTypeInfo = $tw.config.contentTypeInfo[fileInfo.type] || {extension: ""};
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// Generate the filepath
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fileInfo.filepath = $tw.utils.generateTiddlerFilepath(tiddler.fields.title,{
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extension: metaExt || contentTypeInfo.extension,
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directory: options.directory,
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pathFilters: options.pathFilters,
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wiki: options.wiki,
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fileInfo: options.fileInfo
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});
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return fileInfo;
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};
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/*
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Generate the file extension for saving a tiddler
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Options include:
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extFilters: optional array of filters to be used to generate the extention
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wiki: optional wiki for evaluating the extFilters
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*/
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exports.generateTiddlerExtension = function(title,options) {
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var self = this,
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extension;
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// Check if any of the extFilters applies
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if(options.extFilters && options.wiki) {
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$tw.utils.each(options.extFilters,function(filter) {
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if(!extension) {
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var source = options.wiki.makeTiddlerIterator([title]),
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result = options.wiki.filterTiddlers(filter,null,source);
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if(result.length > 0) {
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extension = result[0];
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}
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}
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});
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}
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return extension;
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};
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/*
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Generate the filepath for saving a tiddler
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Options include:
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extension: file extension to be added the finished filepath
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directory: absolute path of root directory to which we are saving
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pathFilters: optional array of filters to be used to generate the base path
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wiki: optional wiki for evaluating the pathFilters
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fileInfo: an existing fileInfo object to check against
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*/
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exports.generateTiddlerFilepath = function(title,options) {
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var self = this,
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directory = options.directory || "",
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extension = options.extension || "",
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filepath;
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// Check if any of the pathFilters applies
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if(options.pathFilters && options.wiki) {
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$tw.utils.each(options.pathFilters,function(filter) {
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if(!filepath) {
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var source = options.wiki.makeTiddlerIterator([title]),
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result = options.wiki.filterTiddlers(filter,null,source);
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if(result.length > 0) {
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filepath = result[0];
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}
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}
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});
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}
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if(!filepath) {
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filepath = title;
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// If the filepath already ends in the extension then remove it
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if(filepath.substring(filepath.length - extension.length) === extension) {
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filepath = filepath.substring(0,filepath.length - extension.length);
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}
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// Remove any forward or backward slashes so we don't create directories
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filepath = filepath.replace(/\/|\\/g,"_");
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}
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//If the path does not start with "." or ".." and a path seperator, then
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if(!/^\.{1,2}[/\\]/g.test(filepath)) {
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// Don't let the filename start with any dots because such files are invisible on *nix
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filepath = filepath.replace(/^\.+/g,"_");
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}
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// Remove any characters that can't be used in cross-platform filenames
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filepath = $tw.utils.transliterate(filepath.replace(/<|>|~|\:|\"|\||\?|\*|\^/g,"_"));
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// Truncate the filename if it is too long
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if(filepath.length > 200) {
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filepath = filepath.substr(0,200);
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}
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// If the resulting filename is blank (eg because the title is just punctuation characters)
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if(!filepath) {
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// ...then just use the character codes of the title
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filepath = "";
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$tw.utils.each(title.split(""),function(char) {
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if(filepath) {
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filepath += "-";
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}
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filepath += char.charCodeAt(0).toString();
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});
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}
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// Add a uniquifier if the file already exists
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var fullPath, oldPath = (options.fileInfo) ? options.fileInfo.filepath : undefined,
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count = 0;
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do {
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fullPath = path.resolve(directory,filepath + (count ? "_" + count : "") + extension);
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if(oldPath && oldPath == fullPath) {
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break;
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}
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count++;
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} while(fs.existsSync(fullPath));
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//If the path does not start with the wiki directory, or if the last write failed
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var encode = fullPath.indexOf($tw.boot.wikiPath) !== 0 || ((options.fileInfo || {writeError: false}).writeError == true);
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if(encode){
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//encodeURIComponent() and then resolve to tiddler directory
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fullPath = path.resolve(directory, encodeURIComponent(fullPath));
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}
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// Return the full path to the file
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return fullPath;
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};
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/*
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Save a tiddler to a file described by the fileInfo:
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filepath: the absolute path to the file containing the tiddler
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type: the type of the tiddler file (NOT the type of the tiddler)
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hasMetaFile: true if the file also has a companion .meta file
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*/
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exports.saveTiddlerToFile = function(tiddler,fileInfo,callback) {
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$tw.utils.createDirectory(path.dirname(fileInfo.filepath));
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if(fileInfo.hasMetaFile) {
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// Save the tiddler as a separate body and meta file
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var typeInfo = $tw.config.contentTypeInfo[tiddler.fields.type || "text/plain"] || {encoding: "utf8"};
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fs.writeFile(fileInfo.filepath,tiddler.fields.text,typeInfo.encoding,function(err) {
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if(err) {
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return callback(err);
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}
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fs.writeFile(fileInfo.filepath + ".meta",tiddler.getFieldStringBlock({exclude: ["text","bag"]}),"utf8",callback);
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});
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} else {
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// Save the tiddler as a self contained templated file
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if(fileInfo.type === "application/x-tiddler") {
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fs.writeFile(fileInfo.filepath,tiddler.getFieldStringBlock({exclude: ["text","bag"]}) + (!!tiddler.fields.text ? "\n\n" + tiddler.fields.text : ""),"utf8",callback);
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} else {
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fs.writeFile(fileInfo.filepath,JSON.stringify([tiddler.getFieldStrings({exclude: ["bag"]})],null,$tw.config.preferences.jsonSpaces),"utf8",callback);
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}
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}
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};
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/*
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Save a tiddler to a file described by the fileInfo:
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filepath: the absolute path to the file containing the tiddler
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type: the type of the tiddler file (NOT the type of the tiddler)
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hasMetaFile: true if the file also has a companion .meta file
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*/
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exports.saveTiddlerToFileSync = function(tiddler,fileInfo) {
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$tw.utils.createDirectory(path.dirname(fileInfo.filepath));
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if(fileInfo.hasMetaFile) {
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// Save the tiddler as a separate body and meta file
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var typeInfo = $tw.config.contentTypeInfo[tiddler.fields.type || "text/plain"] || {encoding: "utf8"};
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fs.writeFileSync(fileInfo.filepath,tiddler.fields.text,typeInfo.encoding);
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fs.writeFileSync(fileInfo.filepath + ".meta",tiddler.getFieldStringBlock({exclude: ["text","bag"]}),"utf8");
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} else {
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// Save the tiddler as a self contained templated file
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if(fileInfo.type === "application/x-tiddler") {
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fs.writeFileSync(fileInfo.filepath,tiddler.getFieldStringBlock({exclude: ["text","bag"]}) + (!!tiddler.fields.text ? "\n\n" + tiddler.fields.text : ""),"utf8");
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} else {
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fs.writeFileSync(fileInfo.filepath,JSON.stringify([tiddler.getFieldStrings({exclude: ["bag"]})],null,$tw.config.preferences.jsonSpaces),"utf8");
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}
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}
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};
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/*
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Delete a file described by the fileInfo if it exits
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*/
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exports.deleteTiddlerFile = function(fileInfo, callback) {
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//Only attempt to delete files that exist on disk
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if(!fileInfo.filepath || !fs.existsSync(fileInfo.filepath)) {
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return callback(null);
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}
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// Delete the file
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fs.unlink(fileInfo.filepath,function(err) {
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if(err) {
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return callback(err);
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}
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// Delete the metafile if present
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if(fileInfo.hasMetaFile && fs.existsSync(fileInfo.filepath + ".meta")) {
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fs.unlink(fileInfo.filepath + ".meta",function(err) {
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if(err) {
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return callback(err);
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}
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return $tw.utils.deleteEmptyDirs(path.dirname(fileInfo.filepath),callback);
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});
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} else {
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return $tw.utils.deleteEmptyDirs(path.dirname(fileInfo.filepath),callback);
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}
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});
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};
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/*
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Cleanup old files on disk, by comparing the options values:
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adaptorInfo from $tw.syncer.tiddlerInfo
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bootInfo from $tw.boot.files
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*/
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exports.cleanupTiddlerFiles = function(options, callback) {
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var adaptorInfo = options.adaptorInfo || {},
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bootInfo = options.bootInfo || {},
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title = options.title || "undefined";
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if(adaptorInfo.filepath && bootInfo.filepath && adaptorInfo.filepath !== bootInfo.filepath) {
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return $tw.utils.deleteTiddlerFile(adaptorInfo, function(err){
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if(err) {
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if ((err.code == "EPERM" || err.code == "EACCES") && err.syscall == "unlink") {
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// Error deleting the previous file on disk, should fail gracefully
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$tw.syncer.displayError("Server desynchronized. Error cleaning up previous file for tiddler: "+title, err);
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return callback(null);
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} else {
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return callback(err);
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}
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}
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return callback(null);
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});
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} else {
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return callback(null);
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}
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};
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})();
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