gli - create command-suite apps, a la git, using this awesome Ruby DSL
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Setup and Usage
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Installation:
$ gem install gli

Show list of commands
$ gli help [command]

Show help for one command
$ gli help init

Create a new GLI-based project with the commands foo and bar
$ gli init project_name foo bar

Create a new GLI-based project with an ext directory
$ gli init -e project_name foo bar

Create a new GLI-based project without a test directory (bad!)
$ gli init --notest project_name foo bar

Create a new GLI-based project somewhere else than .
$ gli -r /tmp init project_name foo bar

Just see what GLI would create
$ gli -n init -e project_name foo bar


Using GLI's DSL
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Create a switch (option that takes no args)

  desc 'Dry-run; don't change the disk
  switch [:n,'dry-run']
  # Both -n and --dry-run will work
  # Access in code via global_options[:n]

Create a flag (option that takes an argument)

  desc 'Location of the config file'
  arg_name 'path_to_file'
  default_value '~/.glirc'
  flag [:c,:conf]
  # Both -c and --conf work, if this flag is omitted
  # then the default of ~/.glirc is avaialble to the code
  # Access in code via global_options[:c] (or :conf)

Create a command

  desc 'Get the list of open tickets'
  command [:tickets] do |c|
    c.desc 'Only assigned to me'
    c.switch [:m,:me]

    c.desc 'Show only tickets for one project'
    c.flag [:p,:project,'only-project']

    c.action do |global_options,options,args|
      # global_options has the global options as a hash
      # options are the command specific ones (e.g. options[:p])
      # args are the command line arguments that weren't parsed
      # raise an exception or exit_now! if things go wrong
    end
  end

Set up stuff ahead of time

  pre do |global_options,command,options,args|
    return true if things_are_ok
    return false if we_should_abort_the_command
  end

Use GLI

  exit run(ARGV)
  # run returns a suitable exit status