Hi

Here is my first attempt (see attachment). It works correctly in the 
little testing that I have done (on Windows). Just add 
\usemodule[ctags] somewhere in your environment file, and run context. 
I file called context.tags will be generated which contains the 
labels, filename, and line-number where the label occurs (line number 
can sometimes be off).

I modify a few core macros, so this can possibly break existing stuff 
(It should not, but then ...)

I found no reliable way to know the current file name. So this works 
correctly only if registerfileinfo is called. So one will have the 
correct filename when using a project structure, but not when using 
\input. I do not want to redefine \input, since almost everything 
relies on \input working correctly.


I will also post the module on the garden once I am more comfortable 
with it. This one is too dangerous to go to the core.

Aditya