module Bundler

def which(executable)
  if File.file?(executable) && File.executable?(executable)
    executable
  elsif ENV["PATH"]
    path = ENV["PATH"].split(File::PATH_SEPARATOR).find do |p|
      abs_path = File.join(p, executable)
      File.file?(abs_path) && File.executable?(abs_path)
    end
    path && File.expand_path(executable, path)
  end
end