ruby/lib/irb/cmd/show_cmds.rb

# frozen_string_literal: true

require "stringio"
require_relative "nop"
require_relative "../pager"

module IRB
  # :stopdoc:

  module ExtendCommand
    class ShowCmds < Nop
      category "IRB"
      description "List all available commands and their description."

      def execute(*args)
        commands_info = IRB::ExtendCommandBundle.all_commands_info
        commands_grouped_by_categories = commands_info.group_by { |cmd| cmd[:category] }

        user_aliases = irb_context.instance_variable_get(:@user_aliases)

        commands_grouped_by_categories["Aliases"] = user_aliases.map do |alias_name, target|
          { display_name: alias_name, description: "Alias for `#{target}`" }
        end

        if irb_context.with_debugger
          # Remove the original "Debugging" category
          commands_grouped_by_categories.delete("Debugging")
          # Remove the `help` command as it's delegated to the debugger
          commands_grouped_by_categories["Context"].delete_if { |cmd| cmd[:display_name] == :help }
          # Add an empty "Debugging (from debug.gem)" category at the end
          commands_grouped_by_categories["Debugging (from debug.gem)"] = []
        end

        longest_cmd_name_length = commands_info.map { |c| c[:display_name].length }.max

        output = StringIO.new

        commands_grouped_by_categories.each do |category, cmds|
          output.puts Color.colorize(category, [:BOLD])

          cmds.each do |cmd|
            output.puts "  #{cmd[:display_name].to_s.ljust(longest_cmd_name_length)}    #{cmd[:description]}"
          end

          output.puts
        end

        # Append the debugger help at the end
        if irb_context.with_debugger
          output.puts DEBUGGER__.help
        end

        Pager.page_content(output.string)
      end
    end
  end

  # :startdoc:
end