myapp.rb

#!/usr/bin/ruby
#########################################
# myapp.rb
# Time-stamp: <Sat 2016-11-05 10:42 svarrette>
#
# @description Sample Thor-based CLI to illustrate help display issue
##############################################################################

require 'thor'
require 'thor/actions'
require 'thor/group'
require "thor/error"

module MyApp
  VERSION = '0.1.2'
  module CLI

    #########################
    class Base < ::Thor
      # Default settings for all my Thor-based classes
      include Thor::Actions
      check_unknown_options!
      def self.exit_on_failure?
        true
      end
      class_option :verbose, :aliases => "-v",
                   :type => :boolean, :desc => "Enable verbose output mode"
    end # class Base

    #########################
    class SubCommand < Base
      namespace :sub

      # Override banner method to correct missing subcommand.
      # @see https://github.com/erikhuda/thor/issues/261
      def self.banner(command, namespace = nil, subcommand = false)
        return super if subcommand
        "#{basename} #{self.namespace} #{command.formatted_usage(self, $thor_runner, subcommand)}"
      end

      #......................................
      desc "cmd", "Subcommand example in a separate namespace"
      method_option :output, :aliases => '-o', :desc => 'Output option'
      def cmd()
        say '#cdm', :green
      end # subcmd

    end # class SubCommand


    ###################
    class Main < Base
      map %w[-h --help] => :help   # FAIL
      #...........................................
      desc "init PATH", "initialize MyApp in PATH"
      method_option :force, :default => false, :type => :boolean, :desc => 'Force creation'
      def init(path = '.')
        path = File.expand_path(path)
        say "#init(#{path})", :green
      end # task init

      #......................................
      map %w[-v --version] => :version
      desc "version", "Display version"
      def version
        say 'MyApp version' + MyApp::VERSION, :yellow
      end # version

      ##### sub <subcommand> ##############
      desc "sub SUBCOMMAND", "A subcommand"
      subcommand "sub", MyApp::CLI::SubCommand

    end # class Main

  end
end



##### Let's start the runner
begin
  MyApp::CLI::Main.start(ARGV, :debug => true)
rescue Thor::InvocationError => e
  Thor::Actions.say e.message, :red
  exit 1
end