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A simple directory crawler DSL.


require 'wriggle'

wriggle '/path/to/files' do |w|
  # Print a list of files
  w.file { |path| puts path }

  # Build a list of Rails controller files
  controllers = []
  w.files /_controller\.rb/ do |path|
    controllers << path

  # Print the path of any file named "spec_helper.rb"
  w.file('spec_helper.rb') { |path| puts path }

  # Build an array of Ruby code files
  ruby_files = []
  w.extension :rb do |path|
    ruby_files << path

  # Build an array of video files
  video_files = []
  w.extensions %w(mpg mpeg wmv avi mkv) do |path|
    video_files << path

  # Delete directories that are empty
  w.directories do |path|
    Dir.rmdir(path) unless Dir.entries(path).length > 2

  # Print a list of directories matching "foo"
  # NOTE: Matches "/baz/bar/foo" and "/foo" but not "/foo/bar/baz"
  w.directory(/foo/) { |path| puts path }


Wriggle is a wrapper around Ruby's standard library, Find. As such, it crawls its starting path recursively. This is currently its default -- and only -- behavior.

Defined blocks are yielded to as Find encounters a directory or file, not necessarily the order in which the blocks were defined.

As an example, here is Wriggle crawling its own tree:

ruby-1.9.2-p180 :001 > require 'wriggle'
 => true
ruby-1.9.2-p180 :002 > wriggle '.' do |w|
ruby-1.9.2-p180 :003 >   w.file { |path| puts path }
ruby-1.9.2-p180 :004?>   w.directory { |path| puts path }
ruby-1.9.2-p180 :005?> end

If it were important to output a list of directories and then a list of files, it might be best to collect each in their own arrays and then, outside of the wriggle block, loop through them to print each entry.


gem install wriggle


API Docs


Pull requests and bug reports are very appreciated.

  • Bug reports
  • Patches: Fork and send a pull request.
    • Include specs where it makes sense.

Developer Quickstart

Once you've cloned this repository or your own fork, these steps should adequately prepare you to begin contributing to the project.

Create a new RVM gemset (optional)

rvm gemset create wriggle
rvm gemset use wriggle


First, install Bundler if you haven't already. Then install the development dependencies.

bundle install

Run Specs

rake spec

If everything passes, you're good to go!


Copyright (c) 2011 Robert Speicher. See LICENSE for details.