readdirp

Recursive version of fs.readdir with streaming api.

npm install readdirp
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NPM

Recursive version of fs.readdir. Exposes a stream api.

var readdirp = require('readdirp')
  , path = require('path')
  , es = require('event-stream');

// print out all JavaScript files along with their size

var stream = readdirp({ root: path.join(__dirname), fileFilter: '*.js' });
stream
  .on('warn', function (err) { 
    console.error('non-fatal error', err); 
    // optionally call stream.destroy() here in order to abort and cause 'close' to be emitted
  })
  .on('error', function (err) { console.error('fatal error', err); })
  .pipe(es.mapSync(function (entry) { 
    return { path: entry.path, size: entry.stat.size };
  }))
  .pipe(es.stringify())
  .pipe(process.stdout);

Meant to be one of the recursive versions of fs functions, e.g., like mkdirp.

Table of Contents generated with DocToc

Installation

npm install readdirp

API

var entryStream = readdirp (options)

Reads given root recursively and returns a stream of entry infos.

entry stream

Behaves as follows:

  • emit('data') passes an entry info whenever one is found
  • emit('warn') passes a non-fatal Error that prevents a file/directory from being processed (i.e., if it is inaccessible to the user)
  • emit('error') passes a fatal Error which also ends the stream (i.e., when illegal options where passed)
  • emit('end') called when all entries were found and no more will be emitted (i.e., we are done)
  • emit('close') called when the stream is destroyed via stream.destroy() (which could be useful if you want to manually abort even on a non fatal error) - at that point the stream is no longer readable and no more entries, warning or errors are emitted
  • to learn more about streams, consult the very detailed nodejs streams documentation or the stream-handbook

options

  • root: path in which to start reading and recursing into subdirectories

  • fileFilter: filter to include/exclude files found (see Filters for more)

  • directoryFilter: filter to include/exclude directories found and to recurse into (see Filters for more)

  • depth: depth at which to stop recursing even if more subdirectories are found

  • lstat: if true, readdirp uses fs.lstat instead of fs.stat in order to stat files

entry info

Has the following properties:

  • parentDir : directory in which entry was found (relative to given root)
  • fullParentDir : full path to parent directory
  • name : name of the file/directory
  • path : path to the file/directory (relative to given root)
  • fullPath : full path to the file/directory found
  • stat : built in stat object
  • Example: (assuming root was /User/dev/readdirp)

      parentDir     :  'test/bed/root_dir1',
      fullParentDir :  '/User/dev/readdirp/test/bed/root_dir1',
      name          :  'root_dir1_subdir1',
      path          :  'test/bed/root_dir1/root_dir1_subdir1',
      fullPath      :  '/User/dev/readdirp/test/bed/root_dir1/root_dir1_subdir1',
      stat          :  [ ... ]
    

Filters

There are three different ways to specify filters for files and directories respectively.

  • function: a function that takes an entry info as a parameter and returns true to include or false to exclude the entry

  • glob string: a string (e.g., *.js) which is matched using minimatch, so go there for more information.

    Globstars (**) are not supported since specifiying a recursive pattern for an already recursive function doesn't make sense.

    Negated globs (as explained in the minimatch documentation) are allowed, e.g., !*.txt matches everything but text files.

  • array of glob strings: either need to be all inclusive or all exclusive (negated) patterns otherwise an error is thrown.

    [ '*.json', '*.js' ] includes all JavaScript and Json files.

`[ '!.git', '!node_modules' ]` includes all directories except the '.git' and 'node_modules'.

Directories that do not pass a filter will not be recursed into.

Callback API

Although the stream api is recommended, readdirp also exposes a callback based api.

readdirp (options, callback1 [, callback2])

If callback2 is given, callback1 functions as the fileProcessed callback, and callback2 as the allProcessed callback.

If only callback1 is given, it functions as the allProcessed callback.

allProcessed

  • function with err and res parameters, e.g., function (err, res) { ... }
  • err: array of errors that occurred during the operation, res may still be present, even if errors occurred
  • res: collection of file/directory entry infos

fileProcessed

  • function with entry info parameter e.g., function (entryInfo) { ... }

More Examples

on('error', ..), on('warn', ..) and on('end', ..) handling omitted for brevity

var readdirp = require('readdirp');

// Glob file filter
readdirp({ root: './test/bed', fileFilter: '*.js' })
  .on('data', function (entry) {
    // do something with each JavaScript file entry
  });

// Combined glob file filters
readdirp({ root: './test/bed', fileFilter: [ '*.js', '*.json' ] })
  .on('data', function (entry) {
    // do something with each JavaScript and Json file entry 
  });

// Combined negated directory filters
readdirp({ root: './test/bed', directoryFilter: [ '!.git', '!*modules' ] })
  .on('data', function (entry) {
    // do something with each file entry found outside '.git' or any modules directory 
  });

// Function directory filter
readdirp({ root: './test/bed', directoryFilter: function (di) { return di.name.length === 9; } })
  .on('data', function (entry) {
    // do something with each file entry found inside directories whose name has length 9
  });

// Limiting depth
readdirp({ root: './test/bed', depth: 1 })
  .on('data', function (entry) {
    // do something with each file entry found up to 1 subdirectory deep
  });

// callback api
readdirp(
    { root: '.' }
  , function(fileInfo) { 
      // do something with file entry here
    } 
  , function (err, res) {
      // all done, move on or do final step for all file entries here
    }
);

Try more examples by following instructions on how to get going.

stream api

stream-api.js

Demonstrates error and data handling by listening to events emitted from the readdirp stream.

stream api pipe

stream-api-pipe.js

Demonstrates error handling by listening to events emitted from the readdirp stream and how to pipe the data stream into another destination stream.

grep

grep.js

Very naive implementation of grep, for demonstration purposes only.

using callback api

callback-api.js

Shows how to pass callbacks in order to handle errors and/or data.

tests

The readdirp tests also will give you a good idea on how things work.

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