“which in ruby”: Checking if program exists in $PATH from ruby

Question

my scripts rely heavily on external programs and scripts. I need to be sure that a program I need to call exists. Manually, I\'d check this using \'which\' in the commandlin

Answer 1

This is a tweak of rogeriopvl's answer, making it cross platform:

require 'rbconfig'

def is_windows?
  Config::CONFIG["host_os"] =~ /mswin|mingw/
end

def exists_in_path?(file)
  entries = ENV['PATH'].split(is_windows? ? ";" : ":")
  entries.any? {|f| File.exists?("#{f}/#{file}")}
end