From: Gregory Brown <gregory.t.brown@...>
Date: 2011-06-16T06:24:50+09:00
Subject: [ruby-core:37156] Re: [Ruby 1.9 - Feature #4824] Provide method Kernel#executed?

On Sat, Jun 4, 2011 at 10:17 AM, Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
>
> Issue #4824 has been updated by Yukihiro Matsumoto.
>
>
> I agree providing a method to tell whether it is loaded as a library or is executed as a command is more elegant than '__FILE__ == $0', but I am still afraid #executed? can mean multiple ways so that the name can cause confusion. �We need a better name.

How about main_program?

if main_program?
  puts "Executing main program!"
end

or possibly executed_directly?

if executed_directly?
  puts "This was executed directly by Ruby"
end

someone else suggested directly_executed? which I think is also fine.

Lastly, I think __MAIN__ is reasonable if a method is not to be used,
though it feels a bit too magic for me.