Clin

Clin is Command Line Interface library that provide an clean api for complex command configuration. The way Clin is design allow a command defined by the user to be called via the command line as well as directly in the code without any additional configuration

Installation

Add this line to your application's Gemfile:

gem 'clin'

And then execute:

$ bundle

Or install it yourself as:

$ gem install clin

Then add the following in you ruby script.

require 'clin'

Usage

The examples folder contains various use case of Clin.

Define a command

To define a command you must create a new class that inherit Clin::Command:

class DisplayCommand < Clin::Command
  def run

  end
end

Specify arguments

To specify what argument your command takes use the .arguments method. Clin will then automatically extract the arguments when parsing and pass them when creating the object. You can after access the arguments with @params

class DisplayCommand < Clin::Command
  arguments 'display <message>'

  def run
    puts "Display message: #{params[:message}"
  end
end

Then calling DisplayCommand.parse('display "Hello World!"').run will print Display message: Hello World!

Specify options

You can also specify options using the .option method.

class DisplayCommand < Clin::Command
  arguments 'display <message>'
  option :times, 'Display the message n times'

  def run
    params[:times] ||= 1
    params[:times].times.each do 
        puts "Display message: #{params[:message}"
    end
  end
end

Dispatch to the right command

For complex command line interface you might need several different commands(e.g. git add, git commit,etc.) Define each command as shown previously then use the CommandDispatcher to choose the right command. By default the dispatcher is going to try all the loaded commands(All subclasses of Clin::Commands) but it can be filter.

# Suppose Git::Add and Git::Commit are Clin::Command.
Clin::CommandDispatcher.parse('commit -m "initial commit") #=> Git::Commit<params: {message: "initial commit"}>

To limit filter the usage:

# Suppose Git::Add, Git::Commit, Git::Push are Clin::Command.
dispatcher = Clin::CommandDispatcher.new(Git::Commit, Git::Push)
dispatcher.parse('commit add -A") #=> Will show the help as no command match.
dispatcher.parse('commit -m "initial commit") #=> Git::Commit<params: {message: "initial commit"}>

Contributing

1. Fork it ( https://github.com/timcolonel/clin/fork )
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 a new Pull Request