IRB theme RubyKaigi2024

irb_theme_2024.rb

Reline::LineEditor.prepend Module.new {
  eval <<~RUBY
    def colorize_completion_dialog

         #{(%W(d=@d          ialogs[0];          (c=d&.cont                ents
       )&&(y=d.scroll      _top      ;f=R      eline::Face[:c            omplet
      ion_di    alog];   s=T            ime   .now.t    o_f;c[         0..]=c.i
      nsta        nce_  ev   al{@o||=du   p}  .map        {|t|       e=t.  inde
                 x(f[:  en hanced]);x=0;l =t             .gsub     (/#e    #[[^
              m]*m/,'   ')   .chars.map   {"          #e[48;5    ;${e      ==0?
           '210;1'      :1     45+[(y     +z       =((4*s+      x+=1)/2).floor)%
        2+z%5/3          <1?     0:     43,     6,41][(         y%7-3)**2/4]};38
      ;5;237m"+_1}*'';     y+=1      ;t[1     ..][f[:scrollbar             ]]&&
      l[-1,0]="#e[38;5       ;203m";l})       )*'').tr'$#',?#+             ?\\}

    end
  RUBY

  def update_dialogs(...)
    super(...)
    colorize_completion_dialog
  end

  def rerender
    (@mutex ||= Mutex.new).synchronize { super }
  end
}

Thread.new do
  Reline.line_editor.instance_eval do
    loop do
      sleep 0.1
      colorize_completion_dialog && rerender
    end
  end
end

irb_theme_2024_generator.rb

code = <<~'RUBY'
  d=@dialogs[0];
  (c=d&.contents)&&(
  y=d.scroll_top;
  f=Reline::Face[:completion_dialog];
  s=Time.now.to_f;
  c[0..]=c.instance_eval{@o||=dup}.map{|t|
    e=t.index(f[:enhanced]);
    x=0;
    l=t.gsub(/\e\[[^m]*m/, '').chars.map{
      "\e[48;5;#{e==0?'210;1':145+[(y+z=((4*s+x+=1)/2).floor)%2+z%5/3<1?0:43,6,41][(y%7-3)**2/4]};38;5;237m"+_1
    }*'';
    y+=1;
    t[1..][f[:scrollbar]]&&l[-1,0]="\e[38;5;203m";
    l
  }
  )
RUBY

require 'ripper'; raise unless Ripper.sexp(code.split.join)

chars = ['#'] + "{(%W(#{code.tr("#\\",'$#')})*'').tr'$#',?#+?\\\\}".split.join.chars

puts DATA.read.gsub('#') { chars.shift||'#' }

__END__
Reline::LineEditor.prepend Module.new {
  eval <<~RUBY
    def colorize_completion_dialog

         ##########          ##########          ##########                ####
       ##############      ####      ####      ##############            ######
      ######    ######   ###            ###   ######    ######         ########
      ####        ####  ##   ##########   ##  ####        ####       ####  ####
                 #####  ## ############## ##             #####     ####    ####
              #######   ##   ##########   ##          #######    ####      ####
           #######      ##     ######     ##       #######      ################
        #######          ###     ##     ###     #######         ################
      ################     ####      ####     ################             ####
      ################       ##########       ################             ####

    end
  RUBY

  def update_dialogs(...)
    super(...)
    colorize_completion_dialog
  end

  def rerender
    (@mutex ||= Mutex.new).synchronize { super }
  end
}

Thread.new do
  Reline.line_editor.instance_eval do
    loop do
      sleep 0.1
      colorize_completion_dialog && rerender
    end
  end
end