forked from zhurui/management
205 lines
7.7 KiB
Markdown
205 lines
7.7 KiB
Markdown
# readdirp [](http://travis-ci.org/thlorenz/readdirp)
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[](https://nodei.co/npm/readdirp/)
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Recursive version of [fs.readdir](http://nodejs.org/docs/latest/api/fs.html#fs_fs_readdir_path_callback). Exposes a **stream api**.
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```javascript
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var readdirp = require('readdirp')
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, path = require('path')
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, es = require('event-stream');
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// print out all JavaScript files along with their size
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var stream = readdirp({ root: path.join(__dirname), fileFilter: '*.js' });
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stream
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.on('warn', function (err) {
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console.error('non-fatal error', err);
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// optionally call stream.destroy() here in order to abort and cause 'close' to be emitted
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})
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.on('error', function (err) { console.error('fatal error', err); })
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.pipe(es.mapSync(function (entry) {
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return { path: entry.path, size: entry.stat.size };
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}))
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.pipe(es.stringify())
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.pipe(process.stdout);
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```
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Meant to be one of the recursive versions of [fs](http://nodejs.org/docs/latest/api/fs.html) functions, e.g., like [mkdirp](https://github.com/substack/node-mkdirp).
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**Table of Contents** *generated with [DocToc](http://doctoc.herokuapp.com/)*
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- [Installation](#installation)
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- [API](#api)
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- [entry stream](#entry-stream)
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- [options](#options)
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- [entry info](#entry-info)
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- [Filters](#filters)
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- [Callback API](#callback-api)
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- [allProcessed ](#allprocessed)
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- [fileProcessed](#fileprocessed)
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- [More Examples](#more-examples)
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- [stream api](#stream-api)
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- [stream api pipe](#stream-api-pipe)
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- [grep](#grep)
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- [using callback api](#using-callback-api)
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- [tests](#tests)
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# Installation
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npm install readdirp
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# API
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***var entryStream = readdirp (options)***
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Reads given root recursively and returns a `stream` of [entry info](#entry-info)s.
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## entry stream
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Behaves as follows:
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- `emit('data')` passes an [entry info](#entry-info) whenever one is found
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- `emit('warn')` passes a non-fatal `Error` that prevents a file/directory from being processed (i.e., if it is
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inaccessible to the user)
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- `emit('error')` passes a fatal `Error` which also ends the stream (i.e., when illegal options where passed)
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- `emit('end')` called when all entries were found and no more will be emitted (i.e., we are done)
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- `emit('close')` called when the stream is destroyed via `stream.destroy()` (which could be useful if you want to
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manually abort even on a non fatal error) - at that point the stream is no longer `readable` and no more entries,
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warning or errors are emitted
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- to learn more about streams, consult the very detailed
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[nodejs streams documentation](http://nodejs.org/api/stream.html) or the
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[stream-handbook](https://github.com/substack/stream-handbook)
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## options
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- **root**: path in which to start reading and recursing into subdirectories
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- **fileFilter**: filter to include/exclude files found (see [Filters](#filters) for more)
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- **directoryFilter**: filter to include/exclude directories found and to recurse into (see [Filters](#filters) for more)
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- **depth**: depth at which to stop recursing even if more subdirectories are found
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- **entryType**: determines if data events on the stream should be emitted for `'files'`, `'directories'`, `'both'`, or `'all'`. Setting to `'all'` will also include entries for other types of file descriptors like character devices, unix sockets and named pipes. Defaults to `'files'`.
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- **lstat**: if `true`, readdirp uses `fs.lstat` instead of `fs.stat` in order to stat files and includes symlink entries in the stream along with files.
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## entry info
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Has the following properties:
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- **parentDir** : directory in which entry was found (relative to given root)
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- **fullParentDir** : full path to parent directory
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- **name** : name of the file/directory
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- **path** : path to the file/directory (relative to given root)
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- **fullPath** : full path to the file/directory found
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- **stat** : built in [stat object](http://nodejs.org/docs/v0.4.9/api/fs.html#fs.Stats)
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- **Example**: (assuming root was `/User/dev/readdirp`)
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parentDir : 'test/bed/root_dir1',
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fullParentDir : '/User/dev/readdirp/test/bed/root_dir1',
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name : 'root_dir1_subdir1',
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path : 'test/bed/root_dir1/root_dir1_subdir1',
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fullPath : '/User/dev/readdirp/test/bed/root_dir1/root_dir1_subdir1',
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stat : [ ... ]
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## Filters
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There are three different ways to specify filters for files and directories respectively.
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- **function**: a function that takes an entry info as a parameter and returns true to include or false to exclude the entry
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- **glob string**: a string (e.g., `*.js`) which is matched using [minimatch](https://github.com/isaacs/minimatch), so go there for more
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information.
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Globstars (`**`) are not supported since specifying a recursive pattern for an already recursive function doesn't make sense.
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Negated globs (as explained in the minimatch documentation) are allowed, e.g., `!*.txt` matches everything but text files.
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- **array of glob strings**: either need to be all inclusive or all exclusive (negated) patterns otherwise an error is thrown.
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`[ '*.json', '*.js' ]` includes all JavaScript and Json files.
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`[ '!.git', '!node_modules' ]` includes all directories except the '.git' and 'node_modules'.
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Directories that do not pass a filter will not be recursed into.
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## Callback API
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Although the stream api is recommended, readdirp also exposes a callback based api.
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***readdirp (options, callback1 [, callback2])***
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If callback2 is given, callback1 functions as the **fileProcessed** callback, and callback2 as the **allProcessed** callback.
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If only callback1 is given, it functions as the **allProcessed** callback.
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### allProcessed
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- function with err and res parameters, e.g., `function (err, res) { ... }`
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- **err**: array of errors that occurred during the operation, **res may still be present, even if errors occurred**
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- **res**: collection of file/directory [entry infos](#entry-info)
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### fileProcessed
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- function with [entry info](#entry-info) parameter e.g., `function (entryInfo) { ... }`
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# More Examples
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`on('error', ..)`, `on('warn', ..)` and `on('end', ..)` handling omitted for brevity
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```javascript
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var readdirp = require('readdirp');
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// Glob file filter
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readdirp({ root: './test/bed', fileFilter: '*.js' })
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.on('data', function (entry) {
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// do something with each JavaScript file entry
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});
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// Combined glob file filters
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readdirp({ root: './test/bed', fileFilter: [ '*.js', '*.json' ] })
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.on('data', function (entry) {
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// do something with each JavaScript and Json file entry
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});
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// Combined negated directory filters
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readdirp({ root: './test/bed', directoryFilter: [ '!.git', '!*modules' ] })
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.on('data', function (entry) {
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// do something with each file entry found outside '.git' or any modules directory
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});
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// Function directory filter
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readdirp({ root: './test/bed', directoryFilter: function (di) { return di.name.length === 9; } })
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.on('data', function (entry) {
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// do something with each file entry found inside directories whose name has length 9
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});
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// Limiting depth
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readdirp({ root: './test/bed', depth: 1 })
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.on('data', function (entry) {
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// do something with each file entry found up to 1 subdirectory deep
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});
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// callback api
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readdirp({ root: '.' }, function(fileInfo) {
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// do something with file entry here
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}, function (err, res) {
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// all done, move on or do final step for all file entries here
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});
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```
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Try more examples by following [instructions](https://github.com/paulmillr/readdirp/blob/master/examples/Readme.md)
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on how to get going.
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## tests
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The [readdirp tests](https://github.com/paulmillr/readdirp/blob/master/test/readdirp.js) also will give you a good idea on
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how things work.
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