:tags for ghci

[Claus Reinke]

for backwards compatibility with older editors;-) we now provide 
etags format as well (I don't like the added complexity, but I suspect
that many of you use emacs/xemacs..).

    :tags -c -- create ctags format "tags" file for currently loaded modules
    :tags -e -- create etags format "TAGS" file for currently loaded modules

(combines nicely with ghci's import chasing)

[cvs diff attached; tested briefly with Vim 6.3, Emacs 21.2.1, and 
 XEmacs 21.4, on WinXP]

could this please be added to HEAD (and probably to STABLE before 
the next release)? i have the feeling that the bulk of the code should 
move elsewhere, to be available both for ghci and for a ghc commandline
option - you'll know best. there'll be other ways to improve this as 
well, but it looks like a useful start, and it is nice to have proper tags 
back at last. fixes/improvements can follow.

enjoy,
claus

----- Original Message ----- 
From: "Claus Reinke" <claus.reinke at talk21.com>
To: "Simon Marlow" <simonmar at microsoft.com>
Cc: <cvs-ghc at haskell.org>
Sent: Monday, June 06, 2005 2:22 AM
Subject: :tags for ghci


> 
> while trying to get into the GHC.hs-business, I wrote a little
> addition to ghci/InteractiveUI.hs. as this is my first attempt in this
> area, please take it with a grain of salt, but the idea is to make use
> of available information and add a new command:
> 
>     :tags  -- creates a "tags" file for the currently loaded modules
> 
> supports Vim tags files only, sorry  (on the small examples I tried,
> it is a definite improvement over hasktags, so it would be worth 
> adding this anyway). cvs diff attached.
> 
> I had a look into supporting Emacs as well, but the TAGS files 
> format is somewhat underdocumented as "the format between 
> etags and emacs..". From looking at code and example files, it
> seems that Emacsens not only group tags by file (and possibly
> store the line prefix instead of just the tag?), but insist on 
> counting lines and character positions for each tag, *both* 
> counted from the beginning of the file - can that be right? 
> 
> If yes, neither ghci nor any other sensible non-emacs tool will 
> ever have enough information stored to produce TAGS files, so
> one would have to make an extra pass over each source file to
> extract the character positions for the tags lines..
> 
> suggestions? comments?
> 
> cheers,
> claus
> 
> ps. is there any specification for TAGS files apart from etags.el?
> 
> 


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