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Re: prompt update and TRAPCHLD
On 2016-01-14 18:59:41 -0800, Bart Schaefer wrote:
> The right thing is to explicitly tell ZLE to update the prompt:
>
> TRAPCHLD() {
> psvar[1]=$RANDOM
> [[ -o zle ]] && zle reset-prompt
> }
There's something wrong with it:
cventin:~> where TRAPCHLD <14:00:55
TRAPCHLD () {
[[ -o zle ]] && zle reset-prompt
}
cventin:~> echo & <14:00:59
[1] 23998
[1] + done echo
TRAPCHLD:zle: widgets can only be called when ZLE is active
> Or perhaps your complaint is that the TRAP* function should run sooner?
I think I was surprised when doing some tests. I thought that there
was some race condition in my code because the TRAPCHLD was run too
soon, but that's the opposite! So, the problem is something else.
I've now a better view of what happens. I have something like:
updprompt()
{
local njobs=$#jobstates
echo "--> $njobs" > /dev/tty
print -nP "\e]2;${njobs}\x07" > /dev/tty
echo "--> $njobs" > /dev/tty
}
(the "echo ..." are mainly added for the test).
precmd() { updprompt }
TRAPCHLD() { if [[ -o interactive && -n $TTY ]] then updprompt; fi }
When I type "echo &", in the command line, I generally get:
cventin:~> echo & <14:45:58
[1] 29151
--> 1
--> 1
[1] + done echo
--> 0
--> 0
with "0" in the terminal window title, but I sometimes get:
cventin:~> echo & <14:45:59
[1] 29153
--> 1
[1] + done echo
--> 0
--> 0
--> 1
with "1" in the terminal window title.
Now, I don't understand how this is possible if TRAPCHLD is run
after the prompt is redrawn, i.e. after updprompt has completed
in precmd!
--
Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
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