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Re: Errors with ssh and rsync completion in zsh-beta (Debian unstable)

On Thu, 5 Jul 2007 18:21:57 +0200
Damien Wyart <damien.wyart@xxxxxxx> wrote:
> I get error messages when completing in ssh or rsync commands :
> ,----
> | dwyart@dalpdw2:~$ ssh dw
> | _combination:86: bad floating point constant
> | _combination:86: bad math expression: operator expected at `root'
> | dwyart@dalpdw2:~$ ssh dw@b
> | _combination:76: bad math expression: operator expected at `root'
> | _combination:86: bad floating point constant
> | dwyart@dalpdw2:~$ rsync -av dw@b
> | _combination:76: bad math expression: operator expected at `root'
> `----

Thanks for spotting this.  Here's what's happened.  _combination takes
arguments that may indicate with a suffix :<num> that the num'th match
should be used.  However, it's sloppy about testing for the suffix, and if
the suffix isn't present it uses the full expression.  This was the name of
an array variable ("hosts" in one of the cases).  In previous versions of
the shell, evaluating an array in math context substituted 0 so this went
unnoticed (it still wasn't the right thing to do, obviously).  However,
we've now fixed the syntax so that an array evaluated in math context does
what (I would think) you always expected it would.

The fix is to test for a number properly in _combination.

Index: Completion/Base/Utility/_combination
RCS file: /cvsroot/zsh/zsh/Completion/Base/Utility/_combination,v
retrieving revision 1.1
diff -u -r1.1 _combination
--- Completion/Base/Utility/_combination	2 Apr 2001 11:10:08 -0000	1.1
+++ Completion/Base/Utility/_combination	5 Jul 2007 18:17:00 -0000
@@ -72,13 +72,21 @@
 while [[ "$1" = *=* ]]; do
-  num="${${tmp##*:}:-1}"
+  if [[ $1 = *:* ]]; then
+    num=${tmp##*:}
+  else
+    num=1
+  fi
+if [[ $1 = *:* ]]; then
+  num=${1##*:}
+  num=1
 if zstyle -a ":completion:${curcontext}:$tag" "$style" tmp; then

Peter Stephenson <pws@xxxxxxx>                  Software Engineer
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