PATCH: Re: _arguments parsing of --help output

[Sven Wischnowsky <wischnow@informatik.hu-berlin.de>]

Bart Schaefer wrote:

> On Jul 24, 10:52am, Sven Wischnowsky wrote:
> } Subject: Re: _arguments parsing of --help output
> }
> } Bart Schaefer wrote:
> } 
> } > Many GNU commands include short options in the --help output as well
> } > [...] 
> } > Is there a reason that we don't attempt to complete the short forms?
> } 
> }   _arguments '-e:ea:(1 2)' -e -b -p
> } 
> } This will make `foo -e <TAB>' complete `1' and `2' but `foo -' lists
> } both (with auto-descriptions).
> 
> I don't understand here what you mean by "`foo -' lists both".

With:

  zstyle ':completion:*:option(-*|s)' auto-description 'specify %d'

and Case 1 below `tst <TAB>' gives:

  % tst --
  --e -- specify ea
  --b  --e  --p

I.e. --e is listed twice, the first one is the `--e:ea:(1 2)' and the
second one is the auto-detected one.

Should we make _arguments use only the first, last or most `specifc'
one (`most specific' could mean that it describes more arguments than
the other specs for that same option)?

> ...
> 
> 	_tst() { _arguments -- '*--e:ea:(1 2)' }	# Case 3
> 
> In combination with:
> 
> 	tst() { print -l - --e --b --p }
> 	compdef _tst tst
> 
> ...
> 
> Case 2: Completion after `tst' lists --e --b --p and completion after
> `tst --e' completes `--' and then lists --b and --p; 1 or 2 are never
> completed.
> 
> Case 3: Exactly like Case 2.
> 
> So case 1 behaves as I expected, and case 3 appears to be broken.  (I
> also tried '*e:ea:(1 2)' and a few other patterns.)  I'm not sure what
> I should be expecting from case 2.

The same as from the second case.

The problem was that _arguments only used those specs after the `--'
for options described (in the --help output) by something containing
an equal sign (`--out=FILE' or some such).

The patch below changes that. The descriptions are used as they are,
i.e. in the example above `tst --e <TAB>' works, but `tst --e=<TAB>'
does not. I think this is right. I think I could be convinced
otherwise.


Bye
 Sven

Index: Completion/Base/_arguments
===================================================================
RCS file: /cvsroot/zsh/zsh/Completion/Base/_arguments,v
retrieving revision 1.27
diff -u -r1.27 _arguments
--- Completion/Base/_arguments	2000/05/31 06:11:08	1.27
+++ Completion/Base/_arguments	2000/07/26 08:36:35
@@ -142,11 +142,16 @@
 	cache=( "$cache[@]" "${(@)^tmpo}=${dir}${descr}" )
       fi
 
-      # Everything else is just added as an option without arguments.
+      # Everything else is just added as an option without arguments or
+      # as described by $descr.
 
       if (( $#tmp )); then
         tmp=("${(@)tmp//[^a-zA-Z0-9-]}")
-	cache=( "$cache[@]" "$tmp[@]" )
+        if [[ -n "$descr" ]]; then
+	  cache=( "$cache[@]" "${(@)^tmp}${descr}" )
+        else
+	  cache=( "$cache[@]" "$tmp[@]" )
+        fi
       fi
     done
     set -A "$name" "${(@)cache:# #}"

--
Sven Wischnowsky                         wischnow@informatik.hu-berlin.de