From: Roger Pack <redmine@...>
Date: 2008-12-19T21:07:21+09:00
Subject: [ruby-core:20698] [Feature #839] Add code on each line of a backtrace output to the screen

Issue #839 has been updated by Roger Pack.


heh--I see it--revision 20850, from the diff.  That one works for applying it.

You're right--something that didn't require reading files would be nice.
I suppose the only drawback would be...shouldn't tracer output
>> enter x
<< leave x


and if so, wouldn't requiring users to include tracer possibly cause too much console output to be worth the added verbose output?

Here's an interesting related request:

I also wonder if someday something like this would be possible [1]
NoMethodError: undefined method `capitalize' for nil:NilClass
    from /home/pwilliams/projects/tmp/test.rb:18:in main.greet_user(nil, "williams")
    from /home/pwilliams/projects/tmp/test.rb:14:in main.third(nil, "williams")
    from /home/pwilliams/projects/tmp/test.rb:10:in main.second("williams, peter")
    from /home/pwilliams/projects/tmp/test.rb:4:in main.first("Peter Williams")
    from (irb):41
    from :0

I can think of a way to do this using set_trace_func style stuff to track parameters but that's about it...

I'll look at it more sometime.

Thoughts?
-=R

[1] http://barelyenough.org/blog/2005/04/ruby-backtraces/

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