[ruby-core:84458] [Ruby trunk Feature#4824] Provide method Kernel#executed?

Issue #4824 has been updated by mame (Yusuke Endoh).


The names (or APIs) suggested so far:

```
executed?
required?
main?
first_script?
main_script?
run_script?
is_executed?
is_program?
defined?(__MAIN__)
__FILE__.main?
FILE.executed?
directly_executed?
standalone?
loaded?
__MAIN__
File.main?
File.from_here?
main.main?
```

----------------------------------------
Feature #4824: Provide method Kernel#executed?
https://bugs.ruby-lang.org/issues/4824#change-68961

* Author: lazaridis.com (Lazaridis Ilias)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 
----------------------------------------
The current construct to execute main code looks not very elegant:

~~~ruby
if __FILE__ == $0
  my_main()          # call any method or execute any code
end
~~~

With a `Kernel#executed?` method, this would become more elegant:

~~~ruby
if executed?
  #do this
  #do that
  my_main()
end
~~~

or

~~~ruby
main() if executed?
~~~

This addition would not break any existent behaviour.




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