perf made easy

perf.rb

#!/usr/bin/env ruby

require "rios/easy"

# http://ascii-table.com/ansi-escape-sequences.php
key_remaps = {
  "j" => "\e[B",                # down
  "k" => "\e[A",                # up
  "o" => "\r\n",                # enter
  "u" => "\e[D",                # left
}
key_remap_pattern = Regexp::new(key_remaps.keys.join("|"))

# Hook user's input
on_input do |user_input|
  user_input.gsub(key_remap_pattern) do |original_input|
    if key_remaps.has_key? original_input
      key_remaps[original_input]
    else
      original_input
    end
  end
end

# Wraps command "perf"
listen(["perf"] + ARGV)