Better irb : PRY ! pry, looksee, readline

• Better IRB - a PRY test
• PRY - basic stuff
• Pry Plugins
• Configure Rails with Pry
• PRY Tips
• Looksee gem
• My .pryrc

Better IRB - a PRY test

Install gem i pry. When you launch it, you’ve warned by some readline missing gem. But take a look at this bug … the new version of rb-readline (0.5.pre) is not available (gem list -r rb-readline -a). So :

• clone the depot git clone https://github.com/luislavena/rb-readline.git somewhere
• just launch ruby setup.rb in this cloned directory (you can drop the clone after, and don’t install the gem for now, you’ll get some nasty bugs …) : some fresh readline library will be copied on your ruby 2.0 installation.

And it’s done (except for the warning “DL depreciated …”). Don’t bother for the win32console message, your ANSICON is working (test it : test-ansi in your pry shell)

PRY - basic stuff

First, don’t forget tab and double tab completion !

• help for a list of common command
• wtf? … for the last plantage :)
• cd Array change the binding for Array class ls list method from the binding cd .. back to the main binding (take a look further at looksee gem also) and nestingfor view where we’re from ; very useful for Rails railscast
• simple-prompt for toggle prompt
• hist -tail 5 : list last commands ; hist --grep try for listing command with try and hist --replay 70..72 for replaying lines 70 to 72 (work fine with just one line too)
• .ls .pwd .mkdir ... : you can access directly to all bash / dos command with a dot prefix ; another example (from pry wiki page) how to use ruby variables in shell command :

    pry(main)> x = "[mM]"
    => "[mM]"
    pry(main)> .ls | grep #{x}

• find-method history : to find a method declared in charged gems, add -c arg option to see who’s calling this method
• cat GemFile -l -s 10 : show the file with -l line number, starting from -s the 10th line. Remember you’re under some improved cat command for navigation around the file (q for quit, … )
• gem-cd rails : the gem-cd command change the directory directly to the gem’s one.
• __out[23]__ : use the output result from the 23th command (__in[23]__ for the input command)
• edit myfile.rb launch your editor ; now when you test ie

def hello
  puts "hi !"
end

you can use edit hellofor invoking your editor upon your method, or just edit -t for invoking a temp file

Pry Plugins

    gem i 'pry-theme'
    

and in .pryrc

    Pry.config.theme = "railscasts"
    

you can change on the fly in Pry with pry-theme try _themename_ Note that some theme are in 256 colors … and they don’t work well with windows, so no railscast theme running for the moment …

Configure Rails with Pry

Install the gem in the gemfile

    gem i 'pry-rails', :group =>development
    

Usage :

    show-routes
    show-routes --grep new
    show-models
    

PRY Tips

If you want a quiet return (don’t show the result), just put a ; at the end of the pry line, ie :

  User.first

vs

  User.first;

Usefull when calling a method formatting a result …

Looksee gem

gem i looksee

in .pryrc

require 'looksee' Usage :

>[].ls
>[].ls /^to/

My .pryrc

From several sources. I’ve try to colorize the prompt, but i still have a got a small bug.

    Pry.config.auto_indent = true
    Pry.config.color = true
    Pry.config.editor = "vim"
    Pry.config.history.file = "~/pry_history"
    Pry.config.hooks.add_hook(:before_session, :say_hi_traz) do
      puts "\n\nHi Traz !\nRuby#{RUBY_VERSION}\n\n"
    end
    Pry.config.hooks.add_hook(:after_session, :say_bye_traz) do
      puts "\n\nbye-bye Traz !\n\n"
    end

     
    # color = {
    # :red => "31m",
    # :green => "32m",
    # :yellow => "33m",
    # :blue => "34m",
    # :purple => "35m",
    # :cyan => "36m"
    # }

    Pry.prompt = [
                  proc { |target_self, nest_level, pry|
                        "[#{pry.input_array.size}]\001\e[0;32m\002#{Pry.config.prompt_name}\001\e[0m\002(\001\e[0;33m\002#{Pry.view_clip(target_self)}\001\e[0m\002)#{":#{nest_level}" unless nest_level.zero?}> "
                       },
                  proc { |target_self, nest_level, pry|
                        "[#{pry.input_array.size}]\001\e[1;32m\002#{Pry.config.prompt_name}\001\e[0m\002(\001\e[1;33m\002#{Pry.view_clip(target_self)}\001\e[0m\002)#{":#{nest_level}" unless nest_level.zero?}* "
                       }
                  ]

    require 'rubygems'
    require 'looksee'
    # theme on win work only with 8 and 16 colors
    # Pry.config.theme = "railscasts"

    begin
      require 'awesome_print' 
      AwesomePrint.pry!
      #Pry.config.print = proc { |output, value| output.puts value.ai }
    rescue LoadError => err
      puts "no awesome_print :("
    end

    # require 'wirble'
    # Wirble.init
    # Wirble.colorize



    begin
      require 'hirb'
      rescue LoadError
      # Missing goodies, bummer
    end
     
    if defined? Hirb
      # Dirty hack to support in-session Hirb.disable/enable
      Hirb::View.instance_eval do
        def enable_output_method
          @output_method = true
          Pry.config.print = proc do |output, value|
          Hirb::View.view_or_page_output(value) || Pry::DEFAULT_PRINT.call(output, value)
          end
        end
       
        def disable_output_method
          Pry.config.print = proc { |output, value| Pry::DEFAULT_PRINT.call(output, value) }
          @output_method = nil
        end
      end
       
      Hirb.enable
    end