Very Computer

  does anyone know of a tool I can use to create an index / search
engine for source code (ksh, sh, bash, perl, tcl, expect, awk, C,
java, etc)?

I'm thinking of something that would generate an index based on
keywords, "text", operators, functions, etc... I'm sure I can't be the
1st person to want something like this and I don't want to re-invent
the wheel.

I've looked at Exhuberant Ctags and its not quite what I need, but its
in the general vicinity.

I suspect that I could somehow use ViM syntax-highlighting to produce
indices on a file-by-file basis somehow since it knows all the "stuff"
I want to index for all those languages (it needs to for the
highlighting).

Any ideas?

Thanks,

Kevin