yet another snippet of daily use which I merged into my local grml zshrc.
Provided here in the hope that you will find it useful and merge it into grmls
zshrc at your convenience (it's not urgent) :-)

Extends "purge" function to delete temporary files of corresponding LaTeX,
Haskell or Python source files. 
I.e. it deletes those temporary files only if the source files which generated
them also exists.