From: Joel VanderWerf <vjoel@...>
Date: 2004-05-25T05:39:16+09:00
Subject: RCR? change Proc#inspect to show start..end lines


Proc#inspect typically returns a string like:

#<Proc:0x401c6d54@file.rb:3>

where the "3" is the first line of the code block in file "file.rb".

It would be easier to extract the entire code block without doing 
parsing if Proc#inspect returned a _range_ of lines:

#<Proc:0x401c6d54@file.rb:3..5>

It would also be nice to have reader methods to get this information 
from the proc:

Proc#file
Proc#line_start
Proc#line_finish

Opinions? Is there something simple I'm missing?

I thought that eval-ing __LINE__ against the proc's binding might give 
the last line of the proc's definition, but actually the results are 
surprisingly inconsistent:

$ cat t1.rb
pr = proc {
   1+1
   puts
}

p eval("__LINE__", pr)

$ ruby t1.rb
2

$ cat t2.rb
pr = proc {
   x=1+1
   puts
}

p eval("__LINE__", pr)

$ ruby t2.rb
4