|No such thing as a small change|
Rewriting a large code baseby Ovid (Cardinal)
|on Jun 28, 2001 at 03:48 UTC||Need Help??|
Ovid has asked for the
wisdom of the Perl Monks concerning the following question:
I have been tasked with overseeing the rewrite a very large Web-based application. This application was written before I started working here and Iím not terribly familiar with it. Iíve reviewed some of the code and it is terrible. Some issues:
This is a far more serious task than I have ever undertaken before and I could use all the advice I can get. I have been informed of this just a few minutes ago and here are my rough thoughts on approaching this:
That's where I get stuck. Should I start working on the modules first? I think that's the best approach. However, do I rewrite them so that they set the globals and return the values, so that old code doesn't break? Simply stripping out globals will break every program. Later, when the conversions done, strip out the 'globals' code? I don't like that as I'm leery that the "stripping" out won't be done.
Start porting this application to a test site and build it a piece at a time? That's my preference, but it does mean that we won't have the more robust features available during development.
This is -- for me -- a very large rewrite. It's only about 30 or so programs, as far as I can tell, but many of them are thousands of lines long (though that's due in part to the HERE docs. Am I looking at this the wrong way? Is there a better way I can organize and direct things to get this done? Further, we're not being paid for the rewrite, so this will be done part-time in addition to our other work.
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