# File lib/taskjuggler/Tj3AppBase.rb, line 30
    def initialize
      # Indent and width of options. The deriving class may has to change
      # this.
      @optsSummaryWidth = 22
      @optsSummaryIndent = 5
      # Show some progress information by default
      @silent = false
      @configFile = nil
      @mandatoryArgs = ''
      @mininumRubyVersion = '1.9.2'

      # If stdout is not a tty, we don't use ANSI escape sequences to color
      # the terminal output. Additionally, we have the --no-color option to
      # force colors off in case this does not work properly.
      Term::ANSIColor.coloring = STDOUT.tty?

      # Make sure the MessageHandler is set to default values.
      MessageHandlerInstance.instance.reset
    end

# File lib/taskjuggler/Tj3AppBase.rb, line 111
    def main(argv = ARGV)
      if Gem::Version.new(RUBY_VERSION.dup) <
         Gem::Version.new(@mininumRubyVersion)
        error('tj3app_ruby_version',
              'This program requires at least Ruby version ' +
              "#{@mininumRubyVersion}!")
      end

      # Install signal handler to exit gracefully on CTRL-C.
      intHandler = Kernel.trap('INT') do
        begin
          fatal('tj3app_user_abort', "Aborting on user request!")
        rescue RuntimeError
          exit 1
        end
      end

      retVal = 0
      begin
        args = processArguments(argv)

        # If DEBUG mode has been enabled, we restore the INT trap handler again
        # to get Ruby backtrackes.
        Kernel.trap('INT', intHandler) if $DEBUG

        unless @silent
          puts "#{AppConfig.softwareName} v#{AppConfig.version} - " +
               "#{AppConfig.packageInfo}\n\n" +
               "Copyright (c) #{AppConfig.copyright.join(', ')}\n" +
               "              by #{AppConfig.authors.join(', ')}\n\n" +
               "#{AppConfig.license}\n"
        end

        @rc = RuntimeConfig.new(AppConfig.packageName, @configFile)

        begin
          MessageHandlerInstance.instance.trapSetup = true
          retVal = appMain(args)
          MessageHandlerInstance.instance.trapSetup = false
        rescue TjRuntimeError
          # We have hit a sitatuation that we can't recover from. A message
          # was severed via the MessageHandler to inform the user and we now
          # abort the program.
          return 1
        end

      rescue Exception => e
        if e.is_a?(SystemExit) || e.is_a?(Interrupt)
          # Don't show backtrace on user interrupt unless we are in debug mode.
          $stderr.puts e.backtrace.join("\n") if $DEBUG
          1
        else
          fatal('crash_trap', "#{e}\n#{e.backtrace.join("\n")}\n\n" +
                "#{'*' * 79}\nYou have triggered a bug in " +
                "#{AppConfig.softwareName} version #{AppConfig.version}!\n" +
                "Please see the user manual on how to get this bug fixed!\n" +
                "#{'*' * 79}\n")
        end
      end

      # Exit value in case everything was fine.
      retVal
    end

# File lib/taskjuggler/Tj3AppBase.rb, line 50
    def processArguments(argv)
      @opts = OptionParser.new
      @opts.summary_width = @optsSummaryWidth
      @opts.summary_indent = ' ' * @optsSummaryIndent

      @opts.banner = "#{AppConfig.softwareName} v#{AppConfig.version} - " +
                     "#{AppConfig.packageInfo}\n\n" +
                     "Copyright (c) #{AppConfig.copyright.join(', ')}\n" +
                     "              by #{AppConfig.authors.join(', ')}\n\n" +
                     "#{AppConfig.license}\n" +
                     "For more info about #{AppConfig.softwareName} see " +
                     "#{AppConfig.contact}\n\n" +
                     "Usage: #{AppConfig.appName} [options] " +
                     "#{@mandatoryArgs}\n\n"
      @opts.separator ""
      @opts.on('-c', '--config <FILE>', String,
               format('Use the specified YAML configuration file')) do |arg|
         @configFile = arg
      end
      @opts.on('--silent',
               format("Don't show program and progress information")) do
        @silent = true
        MessageHandlerInstance.instance.outputLevel = :warning
        TaskJuggler::Log.silent = true
      end
      @opts.on('--no-color',
               format("Don't use ANSI contol sequences to color the terminal output. Colors should\nonly be used when spooling to an ANSI terminal. In case the detection fails,\nyou can this option to force colors to be off.\n"
                     )) do
        Term::ANSIColor::coloring = false
      end
      @opts.on('--debug', format('Enable Ruby debug mode')) do
        $DEBUG = true
      end

      yield

      @opts.on_tail('-h', '--help', format('Show this message')) do
        puts @opts.to_s
        quit
      end
      @opts.on_tail('--version', format('Show version info')) do
        puts "#{AppConfig.softwareName} v#{AppConfig.version} - " +
          "#{AppConfig.packageInfo}"
        quit
      end

      begin
        files = @opts.parse(argv)
      rescue OptionParser::ParseError => msg
        puts @opts.to_s + "\n"
        error('tj3app_bad_cmd_options', msg.message)
      end

      files
    end