grd

#!/usr/bin/env ruby

# grd: micro Guard.
#
# Watch one or more filename patterns and then run the given command every time
# something changes.
#
# Example:
#   grd my_model "rspec spec/models/my_model_spec.rb"

require 'listen'

unless ARGV[0] && ARGV[1]
  puts 'USAGE: grd pattern1,pattern2,pattern3 "some command"'
  exit 1
end

files = ARGV[0].split(',').map { |f| Regexp.new(Regexp.escape(f)) }
Listen.to('.', filter: files) { system ARGV[1] }