Re: "{ } always { }" construct and return in called functions

[Mikael Magnusson <mikachu@gmail.com>]

On Tue, May 19, 2015 at 8:22 AM, Mikael Magnusson <mikachu@gmail.com> wrote:
> On Tue, May 19, 2015 at 7:04 AM, Bart Schaefer
> <schaefer@brasslantern.com> wrote:
>> On May 18,  1:47pm, Peter Stephenson wrote:
>> } Subject: Re: "{ } always { }" construct and return in called functions
>> }
>> } Hmmm...  I'm wondering if the fact you've started jobs is important.  It
>> } shouldn't be, with the "&|", and the doshfunc() code is supposed
>> } to make it irrelevant anyway by setting "stopmsg = 1".
>>
>> If you have some other job running in the background, the shell does
>> not exit when 'exit' is called from a zle widget:
>>
>> torch%   unsetopt correct
>> torch%   function _accept_and_quit() {
>> function>   local -a buf
>> function>   buf=(${(z)BUFFER})
>> function>   if which $buf[1] >& /dev/null; then
>> function then>     zsh -c "${BUFFER}" &|
>> function then>     exit
>> function then>   else
>> function else>     zle -M "Command $buf[1] not found"
>> function else>   fi
>> function>   }
>> torch%   zle -N _accept_and_quit
>> torch% { echo BG: $RANDOM; sleep 30; } &
>> [1] 7442
>> BG: 12801
>> torch% bindkey "^M" _accept_and_quit
>> torch% { echo Here: $RANDOM; sleep 10 }
>> _accept_and_quit:5: you have running jobs.
>> torch% { echo Here: $RANDOM; sleep 10 }
>> torch% Here: 29846
>> echo not exited
>> torch%
>> zsh: warning: 1 jobs SIGHUPed
>>
>>
>> It's the same effect as this:
>>
>> torch% { sleep 30 } &
>> [1] 7457
>> torch% exit
>> zsh: you have running jobs.
>> torch% exit
>> zsh: warning: 1 jobs SIGHUPed
>>
>> The difference is that the "you have running jobs" message is suppressed
>> when exit is called from a zle widget.
>>
>> If Mikael adds "unsetopt checkjobs" he should get the effect he wants.
>> He might also want "setopt nohup" to prevent the death of whatever it
>> is that's keeping the shell alive.
>
> A good theory, but
> zshrun ~> echo $options[checkjobs]
> off
> I've always had that option turned off.
>
> Also, since the command is run with &| then surely there are no jobs either way?
>
>> The part about "commands are randomly ran two or three times" does not
>> happen for me -- though I don't know exactly what it means.  Does it
>> mean you can invoke _accept_and_quit two or three times, or does it
>> mean that running _accept_and_quit once mysteriously launches the same
>> job two or three times?
>
> It seems to be run once in the background by the widget, and then
> another one in the foreground that I can ctrl-c out of. I only press
> enter the one time.

If I comment out the exit in my widget, then the command is only run
once, and the commandline stays as it is.

If I put set -x at the head of the function, I get this output when
pressing enter with also the zsh -c line commented out first:
+_accept_and_quit:2> local -a buf
+_accept_and_quit:3> buf=( urxvt )
+_accept_and_quit:4> which urxvt
+_accept_and_quit:6> exit

when the last line is printed, urxvt is run in the foreground. After
exiting that terminal, our zsh exits.

-- 
Mikael Magnusson