List/filter files based on simple concept like 'find' command in Linux/Unix based system
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Find/filter files based on simple criteria like extension, include/exclude some words in the name. It provides the functionality similar to subset of find | grep command in Linux/Unix system.

Initially this was part of my internal project. I extracted this out as a gem so that I can re-use it in other project.

Note: starting from version 0.1.0 this gem will follow the Semantic Versioning convention.


  • Starting from version 0.2.0 only ruby 2.1.0+ are supported (use refinement instead of monkeypatching)
  • Use version 0.1.x if you need to use with ruby 1.9.3


Add this line to your application's Gemfile:

gem 'code_lister'

And then execute:

$ bundle

Or install it yourself as:

$ gem install code_lister


Using as CLI interface

List all pdf and epub files in the /opts/downloads/ directory recursively

$code_lister --base-dir /opt/downloads/ --exts pdf epub --recursive



  -b, [--base-dir=BASE_DIR]                # Base directory
                                           # Default: . (current directory)
  -e, [--exts=one two three]               # List of extensions to search for
  -f, [--non-exts=one two three]           # List of files without extension to search for
  -n, [--inc-words=one two three]          # List of words in the filename to be included with the result if any
  -x, [--exc-words=one two three]          # List of words in the filename to be excluded from the result if any
  -i, [--ignore-case], [--no-ignore-case]  # Ignore the case in the input filename
                                           # Default: --ignore-case
  -r, [--recursive], [--no-recursive]      # Search for files recursively
                                           # Default: --recursive
  -v, [--version], [--no-version]          # Display version information

List files by extensions, patterns, and simple criteria

Example Usage:

  • Find all java and ruby files in a given directory
# find all files that ends with '*.java' or '*.rb' in a given directory
code_lister -b spec/fixtures/ -e rb java


  • Find all java java and ruby files but include only the files that contain the word xxx
$code_lister -b spec/fixtures/ -e rb java -n xxx


  • Same as previous step, but filter out result that contain the word demo3 or demo4
$code_lister -b spec/fixtures/ -e rb java -n xxx -x demo3 demo4



Using as ruby library

This is probably the proper way to utilize the library as the CLI only serve to show the result in the console.

Example of how you might use the library in your own project.

require 'code_lister'
include CodeLister

# To search for everything that ends in '*.java' and '*.rb" recursively
file_list = CodeLister.files base_dir: "spec/fixtures",
                             exts: %w(rb java),
                             recursive: true
puts file_list

# To filter out the result you may do so with the `CodeLister.filter` method
new_list = CodeLister.filter(file_list, inc_words: %w(some list of word),
                                        exc_words: %w(other text to excluded),
                                        ignore_case: false)


git clone
cd code_lister
rake -T

# Play around with it using Pry
rake pry

From inside Pry

include CodeLister

# To search for everything that ends in '*.java' and '*.rb" recursively
list1 = CodeLister.files(base_dir: "spec/fixtures", exts: %w(rb java), recursive: true)
puts list1

# To filter out the result list
list2 = CodeLister.filter(list1, inc_words: %w(final complete), exc_words: %w(demo test))


  1. Fork it (
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request