module Byebug
  # Mix-in module to showing settings
  module ShowFunctions # :nodoc:
    def show_setting(setting_name)
      case setting_name
      when /^annotate$/
        Byebug.annotate ||= 0
        return ("Annotation level is #{Byebug.annotate}")
      when /^args$/
        if Command.settings[:argv] and Command.settings[:argv].size > 0
          if defined?(Byebug::RDEBUG_SCRIPT)
            # rdebug was called initially. 1st arg is script name.
            args = Command.settings[:argv][1..-1].join(' ')
          else
            # rdebug wasn't called initially. 1st arg is not script name.
            args = Command.settings[:argv].join(' ')
          end
        else
          args = ''
        end
        return "Argument list to give program being debugged when it is started is \"#{args}\"."
      when /^autolist$/
        on_off = Command.settings[:autolist] > 0
        return "autolist is #{show_onoff(on_off)}."
      when /^autoeval$/
        on_off = Command.settings[:autoeval]
        return "autoeval is #{show_onoff(on_off)}."
      when /^autoreload$/
        on_off = Command.settings[:reload_source_on_change]
        return "autoreload is #{show_onoff(on_off)}."
      when /^autoirb$/
        on_off = Command.settings[:autoirb] > 0
        return "autoirb is #{show_onoff(on_off)}."
      when /^basename$/
        on_off = Command.settings[:basename]
        return "basename is #{show_onoff(on_off)}."
      when /^callstyle$/
        style = Command.settings[:callstyle]
        return "Frame call-display style is #{style}."
      when /^commands(:?\s+(\d+))?$/
        if @state.interface.readline_support?
          s = '';
          args = @match[1].split
          if args[1]
            first_line = args[1].to_i - 4
            last_line  = first_line + 10 - 1
            if first_line > Readline::HISTORY.length
              first_line = last_line = Readline::HISTORY.length
            elsif first_line <= 0
              first_line = 1
            end
            if last_line > Readline::HISTORY.length
              last_line = Readline::HISTORY.length
            end
            i = first_line
            commands = Readline::HISTORY.to_a[first_line..last_line]
          else
            if Readline::HISTORY.length > 10
              commands = Readline::HISTORY.to_a[-10..-1]
              i = Readline::HISTORY.length - 10
            else
              commands = Readline::HISTORY.to_a
              i = 1
            end
          end
          commands.each do |cmd|
            s += ("%5d  %s\n" % [i, cmd])
            i += 1
          end
        else
          s='No readline support'
        end
        return s
      when /^byebugtesting$/
        on_off = Command.settings[:byebugtesting]
        return "Currently testing the byebug is #{show_onoff(on_off)}."
      when /^forcestep$/
        on_off = self.class.settings[:force_stepping]
        return "force-stepping is #{show_onoff(on_off)}."
      when /^fullpath$/
        on_off = Command.settings[:full_path]
        return "Displaying frame's full file names is #{show_onoff(on_off)}."
      when /^history(:?\s+(filename|save|size))?$/
        args = @match[1].split
        interface = @state.interface
        if args[1]
          show_save = show_size = show_filename = false
          prefix = false
          if args[1] == "save"
            show_save = true
          elsif args[1] == "size"
            show_size = true
          elsif args[1] == "filename"
            show_filename = true
          end
        else
          show_save = show_size = show_filename = true
          prefix = true
        end
        s = []
        if show_filename
          msg = (prefix ? "filename: " : "") +
            "The filename in which to record the command history is " +
                      "#{interface.histfile.inspect}"
          s << msg
        end
        if show_save
          msg = (prefix ? "save: " : "") +
            "Saving of history save is #{show_onoff(interface.history_save)}."
          s << msg
        end
        if show_size
          msg = (prefix ? "size: " : "") +
            "Byebug history size is #{interface.history_length}"
          s << msg
        end
        return s.join("\n")
      when /^linetrace$/
        on_off = Command.settings[:tracing]
        return "line tracing is #{show_onoff(on_off)}."
      when /^linetrace\+$/
        on_off = Command.settings[:tracing_plus]
        if on_off
          return "line tracing style is different consecutive lines."
        else
          return "line tracing style is every line."
        end
      when /^listsize$/
        listlines = Command.settings[:listsize]
        return "Number of source lines to list by default is #{listlines}."
      when /^port$/
        return "server port is #{Byebug::PORT}."
      when /^trace$/
        on_off = Command.settings[:stack_trace_on_error]
        return "Displaying stack trace is #{show_onoff(on_off)}."
      when /^version$/
        return "byebug #{Byebug::VERSION}"
      when /^width$/
        return "width is #{self.class.settings[:width]}."
      else
        return "Unknown show subcommand #{setting_name}."
      end
    end
  end

  # Implements byebug "show" command.
  class ShowCommand < Command

    Subcommands =
      [
        ['annotate', 2, "Show annotation level",
"0 == normal; 2 == output annotated suitably for use by programs that control
byebug."],
        ['args', 2,
"Show argument list to give program being debugged when it is started",
"Follow this command with any number of args, to be passed to the program."],
        ['autoeval',  4, "Show if unrecognized command are evaluated"],
        ['autolist',  4, "Show if 'list' commands is run on breakpoints"],
        ['autoirb',   4, "Show if IRB is invoked on byebug stops"],
        ['autoreload', 4, "Show if source code is reloaded when changed"],
        ['basename',  1, "Show if basename used in reporting files"],
        ['callstyle', 2, "Show paramater style used showing call frames"],
        ['commands',  2, "Show the history of commands you typed",
"You can supply a command number to start with."],
        ['forcestep', 1, "Show if sure 'next/step' forces move to a new line"],
        ['fullpath',  2, "Show if full file names are displayed in frames"],
        ['history', 2, "Generic command for showing command history parameters",
"show history filename -- Show the filename in which to record the command history
show history save -- Show saving of the history record on exit
show history size -- Show the size of the command history"],
        ['keep-frame-bindings', 1, "Save frame binding on each call"],
        ['linetrace', 3, "Show line execution tracing"],
        ['linetrace+', 10,
"Show if consecutive lines should be different are shown in tracing"],
        ['listsize', 3, "Show number of source lines to list by default"],
        ['port', 3, "Show server port"],
        ['post-mortem', 3,
"Show whether we go into post-mortem debugging on an uncaught exception"],
        ['trace', 1,
"Show if a stack trace is displayed when 'eval' raises exception"],
        ['version', 1, "Show byebug's version"],
        ['width', 1, "Show the number of characters byebug thinks are in a line"]
      ].map do |name, min, short_help, long_help|
      SubcmdStruct.new(name, min, short_help, long_help)
    end unless defined?(Subcommands)

    self.allow_in_control = true

    def regexp
      /^show (?: \s+ (.+) )?$/xi
    end

    def execute
      if not @match[1]
        print "\"show\" must be followed by the name of an show command:\n"
        print "List of show subcommands:\n\n"
        for subcmd in Subcommands do
          print "show #{subcmd.name} -- #{subcmd.short_help}\n"
        end
      else
        args = @match[1].split(/[ \t]+/)
        param = args.shift
        subcmd = find(Subcommands, param)
        if subcmd
          print "%s\n" % show_setting(subcmd.name)
        else
          print "Unknown show command #{param}\n"
        end
      end
    end

    class << self
      def help_command
        "show"
      end

      def help(args)
        if args[1]
          s = args[1]
          subcmd = Subcommands.find do |try_subcmd|
            (s.size >= try_subcmd.min) and
              (try_subcmd.name[0..s.size-1] == s)
          end
          if subcmd
            str = subcmd.short_help + '.'
            str += "\n" + subcmd.long_help if subcmd.long_help
            return str
          else
            return "Invalid 'show' subcommand '#{args[1]}'."
          end
        end
        s = "
          Generic command for showing things about the byebug.

          --
          List of show subcommands:
          --
        "
        for subcmd in Subcommands do
          s += "show #{subcmd.name} -- #{subcmd.short_help}\n"
        end
        return s
      end
    end
  end
end