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Re: zsh 3.0.1 bug
- X-seq: zsh-workers 2292
- From: Zoltan Hidvegi <hzoli@xxxxxxxxxx>
- To: gwing@xxxxxxxxxxxxxxx (Geoff Wing)
- Subject: Re: zsh 3.0.1 bug
- Date: Tue, 29 Oct 1996 03:01:27 +0100 (MET)
- Cc: jlf@xxxxxxx, zsh-workers@xxxxxxxxxxxxxxx
- In-reply-to: <199610282325.KAA05469@xxxxxxxxxxxxxxxxxxxxx> from Geoff Wing at "Oct 29, 96 10:25:16 am"
Geoff Wing wrote:
> :If this is a zsh bug, it would be nice to get a fix...
>
> (This was introduced in 3.0.1-test2 (between Sept 3 & 23). I suspect it's
> to do with Zoltan's changes to lex.c, but then, what do I know :-)
> We'll let Zoltan clarify this.)
The lexer has to decide wether a word containing an equals sign is a
command or an assignment. For example 1foo=bar is not an assignment
because 1foo is not a valid identifier. Same holds for ${1}=foo because
`${1}' is not an identifier. It may be after expanding ${1} but the lexer
could not expand variables. That happens later.
> Here's a quick cleanup I did. There are a couple of other ways to do it and
> I suspect there are a couple of unnecessary things in there, but ...
Here is my cleanup :-) which demonstrates the power of `parameter
expansion'. If you use setopt localoptions globsubst it can also be used
as undepend pattern PATH_VARIABLE to delete everything matching pattern.
Zoltan
#!/usr/bin/zsh
#zsh function to delete some dir to PATHS variables
#Usage: undepend /some/dir PATH_VARIABLE
#Example: undepend /usr/openwin/bin PATH
# delete any occurrences of /usr/openwin/bin in $PATH
#
#Check usage
if [ $# -ne 2 ]
then
echo 'Usage: undepend /some/dir PATH_VARIABLE' 2>&1
return 1
fi
setopt local_options no_glob_subst
eval "$2=\"\${(j[:])\${(s[:])$2}:#$1}\""
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