253 lines
9.2 KiB
JavaScript
253 lines
9.2 KiB
JavaScript
/* wrench.js
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*
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* A collection of various utility functions I've found myself in need of
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* for use with Node.js (http://nodejs.org/). This includes things like:
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*
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* - Recursively deleting directories in Node.js (Sync, not Async)
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* - Recursively copying directories in Node.js (Sync, not Async)
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* - Recursively chmoding a directory structure from Node.js (Sync, not Async)
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* - Other things that I'll add here as time goes on. Shhhh...
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*
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* These are all developed due to my work on Luno (http://github.com/ryanmcgrath/luno).
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*
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* ~ Ryan McGrath (ryan [at] venodesigns.net)
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*/
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var fs = require("fs");
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/* wrench.rmdirSyncRecursive("directory_path");
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*
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* Recursively dives through directories and obliterates everything about it. This is a
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* Sync-function, which blocks things until it's done. No idea why anybody would want an
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* Asynchronous version. :\
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*/
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exports.rmdirSyncRecursive = function(path) {
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var files = fs.readdirSync(path),
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currDir = path;
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/* Loop through and delete everything in the sub-tree after checking it */
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for(var i = 0; i < files.length; i++) {
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var currFile = fs.statSync(currDir + "/" + files[i]);
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if(currFile.isDirectory()) // Recursive function back to the beginning
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exports.rmdirSyncRecursive(currDir + "/" + files[i]);
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else if(currFile.isSymbolicLink()) // Unlink symlinks
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fs.unlinkSync(currDir + "/" + files[i]);
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else // Assume it's a file - perhaps a try/catch belongs here?
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fs.unlinkSync(currDir + "/" + files[i]);
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}
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/* Now that we know everything in the sub-tree has been deleted, we can delete the main
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directory. Huzzah for the shopkeep. */
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return fs.rmdirSync(path);
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};
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/* wrench.copyDirSyncRecursive("directory_to_copy", "new_directory_location", opts);
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*
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* Recursively dives through a directory and moves all its files to a new location. This is a
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* Synchronous function, which blocks things until it's done. If you need/want to do this in
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* an Asynchronous manner, look at wrench.copyDirRecursively() below.
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*
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* Note: Directories should be passed to this function without a trailing slash.
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*/
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exports.copyDirSyncRecursive = function(sourceDir, newDirLocation) {
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/* Copying over something is... tricky. The user should know what they're doing at this point, so...
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* blow any existing directory away!
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*/
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try {
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if(fs.statSync(newDirLocation).isDirectory()) exports.rmdirSyncRecursive(newDirLocation);
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} catch(e) { }
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/* Create the directory where all our junk is moving to; read the mode of the source directory and mirror it */
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var checkDir = fs.statSync(sourceDir);
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fs.mkdirSync(newDirLocation, checkDir.mode);
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var files = fs.readdirSync(sourceDir);
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for(var i = 0; i < files.length; i++) {
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var currFile = fs.statSync(sourceDir + "/" + files[i]);
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if(currFile.isDirectory()) {
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/* Create a new directory in our copied version... */
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fs.mkdirSync(newDirLocation + "/" + files[i], currFile.mode);
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/* ...and then recursion this thing right on back. */
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exports.copyDirSyncRecursive(sourceDir + "/" + files[i], newDirLocation + "/" + files[i]);
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} else if(currFile.isSymbolicLink()) {
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var symlinkFull = fs.readlinkSync(sourceDir + "/" + files[i]);
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fs.symlinkSync(symlinkFull, newDirLocation + "/" + files[i]);
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} else {
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/* At this point, we've hit a file actually worth copying... so copy it on over. */
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var contents = fs.readFileSync(sourceDir + "/" + files[i]);
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fs.writeFileSync(newDirLocation + "/" + files[i], contents);
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}
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}
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};
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/* wrench.chmodSyncRecursive("directory", filemode);
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*
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* Recursively dives through a directory and chmods everything to the desired mode. This is a
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* Synchronous function, which blocks things until it's done.
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*
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* Note: Directories should be passed to this function without a trailing slash.
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*/
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exports.chmodSyncRecursive = function(sourceDir, filemode) {
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var files = fs.readdirSync(sourceDir);
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for(var i = 0; i < files.length; i++) {
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var currFile = fs.statSync(sourceDir + "/" + files[i]);
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if(currFile.isDirectory()) {
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/* ...and recursion this thing right on back. */
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exports.chmodSyncRecursive(sourceDir + "/" + files[i], filemode);
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} else {
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/* At this point, we've hit a file actually worth copying... so copy it on over. */
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fs.chmod(sourceDir + "/" + files[i], filemode);
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}
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}
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/* Finally, chmod the parent directory */
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fs.chmod(sourceDir, filemode);
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};
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/* wrench.chownSyncRecursive("directory", uid, gid);
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*
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* Recursively dives through a directory and chowns everything to the desired user and group. This is a
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* Synchronous function, which blocks things until it's done.
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*
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* Note: Directories should be passed to this function without a trailing slash.
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*/
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exports.chownSyncRecursive = function(sourceDir, uid, gid) {
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var files = fs.readdirSync(sourceDir);
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for(var i = 0; i < files.length; i++) {
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var currFile = fs.statSync(sourceDir + "/" + files[i]);
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if(currFile.isDirectory()) {
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/* ...and recursion this thing right on back. */
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exports.chownSyncRecursive(sourceDir + "/" + files[i], uid, gid);
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} else {
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/* At this point, we've hit a file actually worth chowning... so own it. */
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fs.chownSync(sourceDir + "/" + files[i], uid, gid);
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}
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}
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/* Finally, chown the parent directory */
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fs.chownSync(sourceDir, uid, gid);
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};
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/* wrench.rmdirRecursive("directory_path", callback);
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*
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* Recursively dives through directories and obliterates everything about it.
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*/
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exports.rmdirRecursive = function rmdirRecursive(dir, clbk){
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fs.readdir(dir, function(err, files){
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if (err) return clbk(err);
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(function rmFile(err){
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if (err) return clbk(err);
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var filename = files.shift();
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if (filename === null || typeof filename == 'undefined')
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return fs.rmdir(dir, clbk);
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var file = dir+'/'+filename;
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fs.stat(file, function(err, stat){
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if (err) return clbk(err);
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if (stat.isDirectory())
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rmdirRecursive(file, rmFile);
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else
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fs.unlink(file, rmFile);
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});
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})();
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});
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};
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/* wrench.copyDirRecursive("directory_to_copy", "new_location", callback);
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*
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* Recursively dives through a directory and moves all its files to a new
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* location.
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*
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* Note: Directories should be passed to this function without a trailing slash.
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*/
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exports.copyDirRecursive = function copyDirRecursive(srcDir, newDir, clbk) {
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fs.stat(newDir, function(err, newDirStat){
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if (!err) return exports.rmdirRecursive(newDir, function(err){
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copyDirRecursive(srcDir, newDir, clbk);
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});
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fs.stat(srcDir, function(err, srcDirStat){
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if (err) return clbk(err);
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fs.mkdir(newDir, srcDirStat.mode, function(err){
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if (err) return clbk(err);
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fs.readdir(srcDir, function(err, files){
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if (err) return clbk(err);
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(function copyFiles(err){
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if (err) return clbk(err);
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var filename = files.shift();
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if (filename === null || typeof filename == 'undefined')
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return clbk();
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var file = srcDir+'/'+filename,
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newFile = newDir+'/'+filename;
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fs.stat(file, function(err, fileStat){
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if (fileStat.isDirectory())
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copyDirRecursive(file, newFile, copyFiles);
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else if (fileStat.isSymbolicLink())
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fs.readlink(file, function(err, link){
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fs.symlink(link, newFile, copyFiles);
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});
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else
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fs.readFile(file, function(err, data){
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fs.writeFile(newFile, data, copyFiles);
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});
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});
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})();
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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.LineReader = function(filename, bufferSize) {
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this.bufferSize = bufferSize || 8192;
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this.buffer = "";
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this.fd = fs.openSync(filename, "r");
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this.currentPosition = 0;
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}
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exports.LineReader.prototype = {
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getBufferAndSetCurrentPosition: function(position) {
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var res = fs.readSync(this.fd, this.bufferSize, position, "ascii");
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this.buffer += res[0];
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if(res[1] === 0) return -1;
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this.currentPosition = position + res[1];
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return this.currentPosition;
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},
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hasNextLine: function() {
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while(this.buffer.indexOf('\n') === -1) {
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this.getBufferAndSetCurrentPosition(this.currentPosition);
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if(this.currentPosition === -1) return false;
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}
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if(this.buffer.indexOf("\n") > -1) return true;
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return false;
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},
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getNextLine: function() {
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var lineEnd = this.buffer.indexOf("\n"),
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result = this.buffer.substring(0, lineEnd);
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this.buffer = this.buffer.substring(result.length + 1, this.buffer.length);
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return result;
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}
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};
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