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Class: IRB::Command::Help

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Base
Instance Chain:
self, Base
Inherits: IRB::Command::Base
Defined in: lib/irb/command/help.rb

Class Method Summary

Base - Inherited

.category, .description, .execute, .help_message, .new, .highlight

Instance Attribute Summary

Base - Inherited

#irb_context

Instance Method Summary

Base - Inherited

#execute

Constructor Details

This class inherits a constructor from IRB::Command::Base

Instance Method Details

#add_category_to_output(category, cmds, output, longest_cmd_name_length) (private)

[ GitHub ] 

  


# File 'lib/irb/command/help.rb', line 72



def add_category_to_output(category, cmds, output, longest_cmd_name_length)
  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


  








  

    #execute(command_name)  
  

  [ GitHub ]


  

  


# File 'lib/irb/command/help.rb', line 9



def execute(command_name)
  content =
    if command_name.empty?
      help_message
    else
      if command_class = Command.load_command(command_name)
        command_class.help_message || command_class.description
      else
        "Can't find command `#{command_name}`. Please check the command name and try again.\n\n"
      end
    end
  Pager.page_content(content)
end


  








  

    #help_message   (private)
  

  [ GitHub ]


  

  


# File 'lib/irb/command/help.rb', line 25



def help_message
  commands_info = IRB::Command.all_commands_info
  helper_methods_info = IRB::HelperMethod.all_helper_methods_info
  commands_grouped_by_categories = commands_info.group_by { |cmd| cmd[:category] }
  commands_grouped_by_categories["Helper methods"] = helper_methods_info

  if irb_context.with_debugger
    # Remove the original "Debugging" category
    commands_grouped_by_categories.delete("Debugging")
  end

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

  output = StringIO.new

  help_cmds = commands_grouped_by_categories.delete("Help")
  no_category_cmds = commands_grouped_by_categories.delete("No category")
  aliases = irb_context.instance_variable_get(:@command_aliases).map do |alias_name, target|
    { display_name: alias_name, description: "Alias for `#{target}`" }
  end

  # Display help commands first
  add_category_to_output("Help", help_cmds, output, longest_cmd_name_length)

  # Display the rest of the commands grouped by categories
  commands_grouped_by_categories.each do |category, cmds|
    add_category_to_output(category, cmds, output, longest_cmd_name_length)
  end

  # Display commands without a category
  if no_category_cmds
    add_category_to_output("No category", no_category_cmds, output, longest_cmd_name_length)
  end

  # Display aliases
  add_category_to_output("Aliases", aliases, output, longest_cmd_name_length)

  # Append the debugger help at the end
  if irb_context.with_debugger
    # Add "Debugging (from debug.gem)" category as title
    add_category_to_output("Debugging (from debug.gem)", [], output, longest_cmd_name_length)
    output.puts DEBUGGER__.help
  end

  output.string
end