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module EnvUtil
def rubybin
unless ENV["RUBYOPT"]
end
if ruby = ENV["RUBY"]
return ruby
end
ruby = "ruby"
rubyexe = ruby+".exe"
3.times do
if File.exist? ruby and File.executable? ruby and !File.directory? ruby
return File.expand_path(ruby)
end
if File.exist? rubyexe and File.executable? rubyexe
return File.expand_path(ruby)
end
ruby = File.join("..", ruby)
end
begin
require "rbconfig"
File.join(
RbConfig::CONFIG["bindir"],
RbConfig::CONFIG["ruby_install_name"] + RbConfig::CONFIG["EXEEXT"]
)
rescue LoadError
"ruby"
end
end
module_function :rubybin
end
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