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PATCH: pws-N: Handling feeps by return value



This patch removes the feep() function and relies on return values of
widgets to determine whether to beep or not.  Needless to say, there is
never a beep if NO_BEEP is set, mainly because I wouldn't like being hanged
by the neck from a lamppost.

I've handled it a little differently from how I suggested, because I think
this is the simplest and most natural way.  There is only a beep when an
interactive widget exits; calling a widget with zle never causes a beep.
That's because when a top-level user-defined widget exits with non-zero
status, there is now a beep anyway.  If a user widget needs an additional
beep, it can call the new `beep' widget.  So it's now important to get the
return value of your zle widgets right.

I fixed one piece of idiocy:  I merged the zle argument patches wrongly, so
zle -n and zle -N didn't work.

Also, LIST_BEEP works a little differently to fit in with everything else,
namely by changing the return value, rather than by beeping immediately.
This means I had to make one change to the way completion widgets return
values: if the widget itself returned zero, but the completion-call
hierarchy returned non-zero, the latter value is used.  I hope that seems a
natural way of handling things beyond the control of the widget function.
(In fact, you don't even know back in completecall() if the function got
called at all, and before the patch you just got status 0 if something went
wrong elsewhere.)  But maybe if people are going to start writing functions
which call completion widgets this needs doing a different way, i.e. have a
different status for LIST_BEEP from a genuine error.

Some of the vi widgets were a little messy to change, since they feeped
without any obvious connection with the status.  However, I think I've made
sure the status is returned all right and simple experiments work OK.
Someone who uses vi ranges and changes with beeps turned on will have to
test this.

Note that feeping still doesn't have any side effects apart from the beep
itself.

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`
end

-- 
Peter Stephenson <pws@xxxxxxxxxxxxxxxxx>       Tel: +39 050 844536
WWW:  http://www.ifh.de/~pws/
Dipartimento di Fisica, Via Buonarroti 2, 56127 Pisa, Italy



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