Clamp global option example

gitdown.rb

rrequire "clamp"

class Logger

  DEFAULT_LEVEL = 0
  
  attr_accessor :log_level

  def initialize
    @log_level = DEFAULT_LEVEL
  end

  def write(msg)
    puts "(Log level #{log_level}): #{msg}"
  end

end

module GitDown

  class AbstractCommand < Clamp::Command

    option ["-v", "--verbose"], :flag, "be verbose"

    option "--version", :flag, "show version" do
      puts "GitDown-0.0.0a"
      exit(0)
    end

    protected
    
    def logger
      @logger ||= Logger.new.tap do |logger|
        logger.log_level = 1 if verbose?
      end
    end
    
  end

  class CloneCommand < AbstractCommand

    parameter "REPOSITORY", "repository to clone"
    parameter "[DIR]", "working directory", :default => "."

    def execute
      logger.write "Executing 'clone'"
    end

  end

  class PullCommand < AbstractCommand

    option "--[no-]commit", :flag, "Perform the merge and commit the result."

    def execute
      logger.write "Executing 'pull'"
    end

  end

  class StatusCommand < AbstractCommand

    option ["-s", "--short"], :flag, "Give the output in the short-format."

    def execute
      Logger.write "Executing 'status'"
    end

  end

  class MainCommand < AbstractCommand

    subcommand "clone", "Clone a remote repository.", CloneCommand
    subcommand "pull", "Fetch and merge updates.", PullCommand
    subcommand "status", "Display status of local repository.", StatusCommand

  end

end

GitDown::MainCommand.run