Jacob Niehus wrote:
> > > I narrowed it down to the point I can reproduce it with no
> > > configuration file. Apparently keys typed while a shell command is
> > > executing are drawn on screen immediately, then drawn again after the
> > > command finishes. Also I should have mentioned before that this is not
> > > Cygwin-specific; it just was more apparent on Cygwin because Cygwin is
> > > slow, relatively speaking.
> > >
> > > vim -u NONE -i NONE -c 'autocmd InsertCharPre * call system("sleep 1")'
> >
> > Sounds like echo is on while executing the system command, but the typed
> > character is not consumed by the external command.
> >
> > Switching echo off may have undesired side effects, e.g. for a command
> > that asks for confirmation.
> >
> > Perhaps we could detect we get a key right after system() and redraw.
> > That will cause flicker though.
>
> After some more digging, I gather you are referring to settmode(),
> where the options are TMODE_COOK, TMODE_SLEEP, and TMODE_RAW.
> TMODE_COOK allows directly typing characters on screen even while I
> have Vim stopped at a breakpoint in gdb. Using TMODE_SLEEP in
> mch_call_shell() in unix.c instead of TMODE_COOK makes the problem go
> away and system() commands still work, but I don't know what the side
> effects would be. I'm having a hard time looking up cooked shells
> without finding articles about seafood :)
I'll ask a colleague to fix that :-).
The command executed with system() would normally read the text from
stdin. But it's possible to open stderr for input and read text there,
e.g. for a prompt. I can't think of a good example of a command that
does this.
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