From: "Suraj N. Kurapati" <skurapat@...>
Date: 2006-09-05T03:00:07+09:00
Subject: Re: using rcov in already running program

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Mauricio Fernandez wrote:
> On Mon, Sep 04, 2006 at 05:15:24PM +0900, Suraj N. Kurapati wrote:
>> How can I use rcov from an already running Ruby program?
>>
>> I'm running a Ruby interpreter that is embedded within a C program.
>> This situation is the inverse of how rcov is presently used: rcov is
>> used to run *.rb files instead of ruby.
>>
>> So, I want to be able to write something like "require
>> 'rcov/runner'" and have rcov do it do its thing on the currently
>> running Ruby program. This is like running unit tests by simply
>> doing "require 'test/unit'" (which has a Kernel#at_exit statement
>> that runs all the tests before the program terminates).
> 
> I've never used rcov with an embedded Ruby interpreter, but something like
> this should work:
[code snipped]

This works wonderfully. Thank you!

> In your case, you can require 'rcov/runner' in the embedded interpreter, and
> the code loaded/parsed from that moment on will be monitored.

This is fine for my purpose.

> rcov/runner.rb seems a good idea and I'd want to add it to the next release;
> do you have any suggestions regarding the interface or the default options?

Yes, I would like a mechanism to pass the regular rcov command-line
options to the embedded rcov runner. I'm thinking that this can be
done either by setting the global ARGV array or maybe a RCOV_ARGV
array before loading the runner:

RCOV_ARGV = ['--html', '--no-color', '--save', 'coverage.html']
require 'rcov/runner'

> Dumping a textual report like the above one seems to make sense as it is akin
> to Test::Unit's output.

This is sufficient, but I would like to see the more detailed HTML
report as well, so I can know where coverage needs improvement.

Thanks for your consideration.
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