From: mrp@...
Date: 2002-05-03T18:52:37+09:00
Subject: set_trace_func and code coverage

ruby 1.6.6 

#!/usr/local/bin/ruby -w
$lines = []
set_trace_func( proc {|eventname, filename, lineno, objid, binding, classname|
				 $lines << lineno if ( eventname == "line") })

at_exit {  puts $lines.sort.uniq } 

['foo','bar','baz'].each{|w|
  puts w    # line 9
}           # line 10

=====
produces:
$ ./cover.rb 
foo
bar
baz
6
8
9
$

and if   |w|   was on it's own line, that's not 'executed' either.

from a parsing point of view i can see that line 10 isn't _really_
executable code, but from trying to use this as a code coverage tool,
this is a bit of a pain, especially with lines containing many
delimiters.

my question's are: 
	should lines containing just delimeters be included with the output 
	   shown above, or 
	is thinking about code-coverage a bit out of date with dynamic 
       languages?

or is there a coverage tool for ruby out there already? (i couldn't find it!)

thanks,
martin.