PatchReader is a set of utilities for reading in, transforming, and doing various other things with a patch. It basically allows you to create a chain of readers that can read a patch, remove files from a patch, add CVS context, fix up the patch root according to CVS, and output the patch as raw unified or through a template processor (used in some places to output a patch as HTML). WWW: https://metacpan.org/release/PatchReader