From: Sven Wischnowsky <wischnow@informatik.hu-berlin.de>
To: zsh-workers@sunsite.auc.dk
Subject: Re: quote modifier for parameter expansion?
Date: Wed, 3 Feb 1999 17:28:18 +0100 (MET) [thread overview]
Message-ID: <199902031628.RAA13468@beta.informatik.hu-berlin.de> (raw)
In-Reply-To: Peter Stephenson's message of Wed, 03 Feb 1999 17:02:18 +0100
Peter Stephenson wrote:
> Sven Wischnowsky wrote:
> > Hm. I'm sure I'm missing something again, but could anyone please tell
> > me what? The patch below (which probably shouldn't be used) just uses
> > the quote()-function from hist.c to make the `q' modifier in parameter
> > expansion work. The result is almost always a funny looking string in
> > single quotes, but that alone can't be the reason not to use this
> > function.
>
> Does exactly what I would expect it to.
>
> % bar="hello'there"
> % print -r $bar:q
> 'hello'\''there'
>
> Maybe the point is simply it's got limited application, since unless
> it's going into an eval the extra quotes aren't all that useful,
> unlike in history substitution which happens before the quotes get
> swallowed.
But it's also useful if you stuff a string together in a parameter and
later use the value of that parameter for globbing. With `:q' you can
prevent pattern characters in the original parameters from being
interpreted as a pattern.
That's what makes it useful in functions like pfiles(). Without the
patch below and using:
zle -C my-comp complete-word main-complete
doing `foo *<TAB>' will give one all files as possible completions.
Of course, this is the same use as with eval (i.e. double evaluation).
Bye
Sven
--- om/new-completion-examples Wed Feb 3 16:16:57 1999
+++ Misc/new-completion-examples Wed Feb 3 17:25:29 1999
@@ -211,7 +211,7 @@
ppres=( '' )
fi
- str="$PREFIX*$SUFFIX"
+ str="${PREFIX:q}*${SUFFIX:q}"
if [[ -z "$a[1]" || "$str[1]" = [~/] || "$str" = (.|..)/* ]] then
a=()
--
Sven Wischnowsky wischnow@informatik.hu-berlin.de
next reply other threads:[~1999-02-03 16:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-02-03 16:28 Sven Wischnowsky [this message]
-- strict thread matches above, loose matches on Subject: below --
1999-02-05 8:50 Sven Wischnowsky
1999-02-03 15:52 Sven Wischnowsky
1999-02-03 16:02 ` Peter Stephenson
1999-02-03 17:20 ` Bart Schaefer
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