# File lib/notify.rb, line 5 def self.which(prog, path=ENV['PATH']) if RUBY_PLATFORM.downcase =~ /mswin(?!ce)|mingw|bccwin|cygwin/ path.split(File::PATH_SEPARATOR).each {|dir| f = File.join(dir,prog+".exe") return f if File.executable?(File.join(f)) && !File.directory?(f) } nil else return system("which #{prog} > /dev/null 2>&1") end end