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opscode / mixlib-cli

A mixin for creating command line applications - gives an easy DSL for argument specification and processing — Read more

https://www.opscode.com

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Bumping to version 1.2.0

adamhjk (author)

Wed Mar 31 15:05:48 -0700 2010

commit 3e466295289860b43322
tree 36ed099d68a1482809c2
parent aea4132a9e5253fb7887

mixlib-cli /

name	age	history message
.gitignore	Tue Dec 15 15:46:41 -0800 2009	added mixlib-cli.gemspec to .gitignore [Christopher Brown]
LICENSE	Thu Mar 12 17:40:24 -0700 2009	Initial commit [adamhjk]
NOTICE	Thu Mar 12 17:40:24 -0700 2009	Initial commit [adamhjk]
README.rdoc	Wed Mar 31 15:05:48 -0700 2010	Bumping to version 1.2.0 [adamhjk]
Rakefile	Wed Mar 31 15:05:48 -0700 2010	Bumping to version 1.2.0 [adamhjk]
VERSION.yml	Wed Mar 31 15:05:48 -0700 2010	Bumping to version 1.2.0 [adamhjk]
features/	Mon May 11 21:05:35 -0700 2009	Convert mixlib-cli to jeweler. [fujin]
lib/	Fri Mar 26 13:51:44 -0700 2010	moving argv.dup to top of parse_options to pres... [Stephen Delano]
spec/	Fri Mar 26 13:52:27 -0700 2010	adding test for parse_options return behavior [Stephen Delano]

README.rdoc

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,
      :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’:

:short:	The short option, just like from optparse. Example: "-l LEVEL"
:long:	The long option, just like from optparse. Example: "—level LEVEL"
:description:	The description for this item, just like from optparse.
:default:	A default value for this option
:required:	Prints a message informing the user of the missing requirement, and exits. Default is false.
:on:	Set to :tail to appear at the end, or :head to appear at the top.
:boolean:	If this option takes no arguments, set this to true.
:show_options:	If you want the option list printed when this option is called, set this to true.
:exit:	Exit your program with the exit code when this option is specified. Example: 0
:proc:	If set, the configuration value will be set to the return value of this proc.

New in 1.2.0

We no longer destructively manipulate ARGV.

Have fun!

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