关于使用fs.readdir进行异步目录搜索有什么想法吗?我意识到我们可以引入递归,并调用read目录函数来读取下一个目录,但我有点担心它不是异步的…
什么好主意吗?我已经看了node-walk,它很棒,但它不能像readdir那样只给我数组中的文件。虽然
寻找这样的输出…
['file1.txt', 'file2.txt', 'dir/file3.txt']
关于使用fs.readdir进行异步目录搜索有什么想法吗?我意识到我们可以引入递归,并调用read目录函数来读取下一个目录,但我有点担心它不是异步的…
什么好主意吗?我已经看了node-walk,它很棒,但它不能像readdir那样只给我数组中的文件。虽然
寻找这样的输出…
['file1.txt', 'file2.txt', 'dir/file3.txt']
当前回答
另一个答案,但这次使用的是TypeScript:
/** * Recursively walk a directory asynchronously and obtain all file names (with full path). * * @param dir Folder name you want to recursively process * @param done Callback function, returns all files with full path. * @param filter Optional filter to specify which files to include, * e.g. for json files: (f: string) => /.json$/.test(f) */ const walk = ( dir: string, done: (err: Error | null, results ? : string[]) => void, filter ? : (f: string) => boolean ) => { let results: string[] = []; fs.readdir(dir, (err: Error, list: string[]) => { if (err) { return done(err); } let pending = list.length; if (!pending) { return done(null, results); } list.forEach((file: string) => { file = path.resolve(dir, file); fs.stat(file, (err2, stat) => { if (stat && stat.isDirectory()) { walk(file, (err3, res) => { if (res) { results = results.concat(res); } if (!--pending) { done(null, results); } }, filter); } else { if (typeof filter === 'undefined' || (filter && filter(file))) { results.push(file); } if (!--pending) { done(null, results); } } }); }); }); };
其他回答
谁想要一个公认答案的同步替代方案(我知道我做过):
var fs = require('fs');
var path = require('path');
var walk = function(dir) {
let results = [], err = null, list;
try {
list = fs.readdirSync(dir)
} catch(e) {
err = e.toString();
}
if (err) return err;
var i = 0;
return (function next() {
var file = list[i++];
if(!file) return results;
file = path.resolve(dir, file);
let stat = fs.statSync(file);
if (stat && stat.isDirectory()) {
let res = walk(file);
results = results.concat(res);
return next();
} else {
results.push(file);
return next();
}
})();
};
console.log(
walk("./")
)
There are basically two ways of accomplishing this. In an async environment you'll notice that there are two kinds of loops: serial and parallel. A serial loop waits for one iteration to complete before it moves onto the next iteration - this guarantees that every iteration of the loop completes in order. In a parallel loop, all the iterations are started at the same time, and one may complete before another, however, it is much faster than a serial loop. So in this case, it's probably better to use a parallel loop because it doesn't matter what order the walk completes in, just as long as it completes and returns the results (unless you want them in order).
一个平行循环看起来是这样的:
var fs = require('fs');
var path = require('path');
var walk = function(dir, done) {
var results = [];
fs.readdir(dir, function(err, list) {
if (err) return done(err);
var pending = list.length;
if (!pending) return done(null, results);
list.forEach(function(file) {
file = path.resolve(dir, file);
fs.stat(file, function(err, stat) {
if (stat && stat.isDirectory()) {
walk(file, function(err, res) {
results = results.concat(res);
if (!--pending) done(null, results);
});
} else {
results.push(file);
if (!--pending) done(null, results);
}
});
});
});
};
一个串行循环看起来像这样:
var fs = require('fs');
var path = require('path');
var walk = function(dir, done) {
var results = [];
fs.readdir(dir, function(err, list) {
if (err) return done(err);
var i = 0;
(function next() {
var file = list[i++];
if (!file) return done(null, results);
file = path.resolve(dir, file);
fs.stat(file, function(err, stat) {
if (stat && stat.isDirectory()) {
walk(file, function(err, res) {
results = results.concat(res);
next();
});
} else {
results.push(file);
next();
}
});
})();
});
};
并且在你的主目录中测试它(警告:如果你的主目录中有很多东西,结果列表将会非常大):
walk(process.env.HOME, function(err, results) {
if (err) throw err;
console.log(results);
});
编辑:改进的示例。
另一个很好的npm包是glob。
npm公司
它非常强大,应该能满足你所有的递归需求。
编辑:
实际上我对glob不是很满意,所以我创建了readdirp。
我非常有信心,它的API使得递归地查找文件和目录以及应用特定的过滤器非常容易。
阅读它的文档,以更好地了解它的功能和安装方式:
NPM安装readdirp
这是一个简单的同步递归解决方案
const fs = require('fs')
const getFiles = path => {
const files = []
for (const file of fs.readdirSync(path)) {
const fullPath = path + '/' + file
if(fs.lstatSync(fullPath).isDirectory())
getFiles(fullPath).forEach(x => files.push(file + '/' + x))
else files.push(file)
}
return files
}
用法:
const files = getFiles(process.cwd())
console.log(files)
您可以异步地编写它,但是没有必要。只需确保输入目录存在并且可以访问。
下面是一个获得所有文件包括子目录的递归方法。
const FileSystem = require("fs");
const Path = require("path");
//...
function getFiles(directory) {
directory = Path.normalize(directory);
let files = FileSystem.readdirSync(directory).map((file) => directory + Path.sep + file);
files.forEach((file, index) => {
if (FileSystem.statSync(file).isDirectory()) {
Array.prototype.splice.apply(files, [index, 1].concat(getFiles(file)));
}
});
return files;
}