Mixlib::CLI

Mixlib::CLI provides a class-based command line option parsing object, like the one used in Chef, Ohai and Relish. To use in your project:

require 'rubygems'
require 'mixlib/cli'

class MyCLI
  include Mixlib::CLI

  option :config_file,
    :short => "-c CONFIG",
    :long  => "--config CONFIG",
    :default => 'config.rb',
    :description => "The configuration file to use"

  option :log_level,
    :short => "-l LEVEL",
    :long  => "--log_level LEVEL",
    :description => "Set the log level (debug, info, warn, error, fatal)",
    :required => true,
    :in => ['debug', 'info', 'warn', 'error', 'fatal'],
    :proc => Proc.new { |l| l.to_sym }

  option :help,
    :short => "-h",
    :long => "--help",
    :description => "Show this message",
    :on => :tail,
    :boolean => true,
    :show_options => true,
    :exit => 0

end

# ARGV = [ '-c', 'foo.rb', '-l', 'debug' ]
cli = MyCLI.new
cli.parse_options
cli.config[:config_file] # 'foo.rb'
cli.config[:log_level]   # :debug

If you are using this in conjunction with Mixlib::Config, you can do something like this (building on the above definition):

class MyConfig
  extend(Mixlib::Config)

  log_level   :info
  config_file "default.rb"
end

class MyCLI
  def run(argv=ARGV)
    parse_options(argv)
    MyConfig.merge!(config)
  end
end

c = MyCLI.new
# ARGV = [ '-l', 'debug' ]
c.run
MyConfig[:log_level] # :debug

Available arguments to ‘option’:

If you need access to the leftover options that aren’t captured in the config, you can get at them through cli_arguments (referring to the above definition of MyCLI).

# ARGV = [ '-c', 'foo.rb', '-l', 'debug', 'file1', 'file2', 'file3' ]
cli = MyCLI.new
cli.parse_options
cli.cli_arguments # [ 'file1', 'file2', 'file3' ]

LICENSE:

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.