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The example of the asynchronous recursive directory traversal
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// The example of the asynchronous recursive directory traversal | |
// Copyright (c) 2021 Martin Pravda | |
// Permission is hereby granted, free of charge, to any person obtaining a copy | |
// of this software and associated documentation files (the "Software"), to deal | |
// in the Software without restriction, including without limitation the rights | |
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
// copies of the Software, and to permit persons to whom the Software is | |
// furnished to do so, subject to the following conditions: | |
// The above copyright notice and this permission notice shall be included in | |
// all copies or substantial portions of the Software. | |
// The Software shall be used for Good, not Evil. | |
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
// SOFTWARE. | |
/*property | |
freeze, isDirectory, isFile, length, lstat, map, push, readdir, replace, | |
shift | |
*/ | |
import fs from "fs"; | |
// find the ending slash at the end of the string value | |
const slash_rx = /\/$/g; | |
function readdir(callback, dir_path) { | |
fs.readdir( | |
dir_path, | |
function (err, files) { | |
if (err) { | |
callback(undefined, err); | |
return; | |
} | |
callback(files); | |
} | |
); | |
} | |
function lstat(callback, path) { | |
fs.lstat( | |
path, | |
function (err, stats) { | |
if (err) { | |
callback(undefined, err); | |
return; | |
} | |
callback(stats); | |
} | |
); | |
} | |
function readdir_recursively(callback, path) { | |
path = path.replace(slash_rx, ""); | |
const files_queue = [path]; | |
const results = []; | |
function walk(path) { | |
if (files_queue.length === 0) { | |
callback(results); | |
return; | |
} | |
files_queue.shift(); | |
lstat( | |
function (stats, err) { | |
if (err) { | |
callback(undefined, err); | |
return; | |
} | |
if (stats.isFile() === true) { | |
results.push(path); | |
walk(files_queue[0]); | |
} | |
if (stats.isDirectory() === true) { | |
readdir( | |
function (files, err) { | |
if (err) { | |
callback(undefined, err); | |
return; | |
} | |
files = files.map( | |
function (file_name) { | |
return path + "/" + file_name; | |
} | |
); | |
files_queue.push(...files); | |
walk(files_queue[0]); | |
}, | |
path | |
); | |
} | |
}, | |
path | |
); | |
} | |
walk(files_queue[0]); | |
} | |
export default Object.freeze(readdir_recursively); |
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