From: "Bart Schaefer" <schaefer@brasslantern.com>
To: Zefram <zefram@tao.co.uk>, zsh-workers@math.gatech.edu
Subject: Re: PATCH: pass name ($0) and zmult ($1) to user-defined widgets
Date: Fri, 12 Jun 1998 08:54:58 -0700 [thread overview]
Message-ID: <980612085458.ZM21980@candle.brasslantern.com> (raw)
In-Reply-To: <199806120937.KAA10006@taos.demon.co.uk>
On Jun 12, 10:37am, Zefram wrote:
} Subject: Re: PATCH: pass name ($0) and zmult ($1) to user-defined widgets
}
} Bart Schaefer wrote:
} >User-defined widgets should be able to change their behavior or repeat
} >their action when given a digit-argument.
}
} Yes. But that should not be done via positional parameters. I have
} deliberately avoided passing arguments in positional parameters, so
} that one widget can reliably call another without having to fiddle with
} the parameters.
It seems useful to me to follow the Emacs model where the digit-argument
is an optional parameter to the function.
Further, I think the "have one widget call another" model in zsh is a bit
bent as it is. Your plan is to have all widgets, built-in or otherwise,
be on equal footing; I think that should mean that they're all callable
as shell functions, and we should do away with "zle widget-name". It's
much easer to "fiddle with the parameters" than it is to save and restore
a bunch of shared variables.
"zle widget-name" could be replaced by "execute-named-command widget-name"
if every widget acted like a shell function.
As another example, right now it's completely impossible for a user-defined
widget to initiate a history search; "zle history-search-backward" just
causes the shell to prompt the user for input, but the widget may already
have a string it wants to search for. "history-search-backward string" is
the natural way to perform that action.
Where the shared variables are useful is for persistent state; the history
list and current position in it, the editor buffer itself and the position
of the cursor and mark(s), etc.
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
prev parent reply other threads:[~1998-06-12 16:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-06-12 8:38 Bart Schaefer
1998-06-12 9:37 ` Zefram
1998-06-12 15:54 ` Bart Schaefer [this message]
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