Powerline-like prompt for Pry

.pryrc.rb

class Pry
  class Prompt
    SEPARATOR = "\ue0b0".freeze

    def self.powerline_prompt(obj, nest_level, pry, wait)
      [
        Pry::Helpers::Text.cyan(" #{pry.input_array.size} "),
        Pry::Helpers::Text.black_on_blue(SEPARATOR),
        Pry::Helpers::Text.black_on_blue(" #{Pry.config.prompt_name} "),
        Pry::Helpers::Text.blue_on_green(SEPARATOR),
        Pry::Helpers::Text.black_on_green(" #{RUBY_ENGINE}-#{RUBY_VERSION} "),
        Pry::Helpers::Text.green_on_yellow(SEPARATOR),
        Pry::Helpers::Text.black_on_yellow(" #{Pry.view_clip(obj)}#{":#{nest_level}" unless nest_level.zero?} "),
        (Pry::Helpers::Text.yellow_on_black(SEPARATOR) unless wait),
      ].join('')
    end
  end

  module Helpers
    module Text
      extend self
      COLORS.each do |fg_color, fg_value|
        # FIXME: n^2 :(
        COLORS.each do |bg_color, bg_value|
          define_method :"#{fg_color}_on_#{bg_color}" do |text|
            "\033[0;#{30 + fg_value};#{40 + bg_value}m#{text}\033[0m"
          end
        end
      end
    end
  end
end

Pry.prompt = [
  proc { |*args| "#{Pry::Prompt.powerline_prompt(*args, false)} " },
  proc { |*args| "#{Pry::Prompt.powerline_prompt(*args, true)} " }
]