Re: Silly questions about _arguments & Co (and probably bugs)

[Tanaka Akira <akr@jaist.ac.jp>]

In article <001101befac5$29ae4260$21c9ca95@mow.siemens.ru>,
  "Andrej Borsenkow" <Andrej.Borsenkow@mow.siemens.ru> writes:

> Forgive me, but I recently had no time to follow all discussions and do not
> quite understand the manual description.
> 
> 1. When are the description of arguments actually printed? I tried some basic
> commands like xterm or patch but descriptions do not seem to be printed.

Use following.

% compconf group_matches=yes message_format='%d' description_format='%d' describe_options=yes

If it is too verbose, also use following.

% compconf option_prefix=all

> 3. I cannot make completion for patch work. As simple as `patch --sTAB' just
> beeps.

Probably this is because the help text of patch command is not suited
for _arguments.

the help text of patch-2.5.4 contains:

  -p NUM  --strip=NUM  Strip NUM leading components from file names.
  -F LINES  --fuzz LINES  Set the fuzz factor to LINES for inexact matching.

Although I suppose that it is possible to handle `--strip=NUM', but
`--fuzz LINES' are very difficult.

So, I modified the help text.

http://www.ldl.jaist.ac.jp/~akr/junk/patch-2.5.4-akr-19990902.patch

# This patch also contains other functionality. If you have trouble to
# apply my patches, please try it and use --use-index-line.

> 4. `patch -pTAB' gives me `patch -p0 ' - but `0' is not autoremoved if I enter
> different number (I'd expect it to be).

I see.

> 5. `patch TAB' does not list most of the long options at all. Actually, it is
> interesting case - if a command has both long and short form - which one should
> be preferred? I'd like to have short option only if no corresponding short one
> exists.

This is caused by the help text handling failure. Currently _arguments
doesn't handle preferences of options, I think.

Index: Completion/User/_patch
===================================================================
RCS file: /projects/zsh/zsh/Completion/User/_patch,v
retrieving revision 1.1.1.4
diff -u -F^( -r1.1.1.4 _patch
--- _patch	1999/09/07 12:55:07	1.1.1.4
+++ _patch	1999/09/09 13:48:27
@@ -1,7 +1,9 @@
 #compdef patch
 
+local comp_p='compadd "$expl[@]" -S0 -r "1-9" - ""'
+
 _arguments -s \
-  '(--strip)-p+:number:(0)' \
+  '(--strip)-p+:number:'"{$comp_p}" \
   '(--fuzz)-F+:lines:' \
   '(--context)-c' \
   '(--ed)-e' \
@@ -30,7 +32,8 @@
   ':original file:_files' \
   ':patch file:_files' \
   -- \
-  '*=NUM*:number:(0)' \
+  '*strip=NUM*:number:'"{$comp_p}"  \
+  '*get=NUM*:get files from RCS etc:' \
   '*=LINES*:lines:' \
   '*=PATCHFILE*:patch file:_files' \
   '*=FILE*:file:_files' \
-- 
Tanaka Akira