Re: K_IGNORE trick (periodic execution)

On Saturday, March 27, 2010 9:14:21 AM UTC-7, Bram Moolenaar wrote:
> Tony Mechelynck wrote:
>
> > On 26/03/10 23:01, Yakov wrote:
> > > There is trick for periodic execution, involving K_IGNORE and feedkeys
> > > [1].
> > > In the lastest vim 7.2.141, I cannot make it to work anymore.
> > > Timer() is executed only once, as seen from 'echo strftime' printout.
> > > Can anybody confirm this ? Am I missing some global setting ?
> > > 'updatetime' is set to 200.
> > >
> > > autocmd CursorHold * call Timer()
> > > function! Timer()
> > > let K_IGNORE = "\x80\xFD\x35" " internal key code that is ignored
> > > call feedkeys(K_IGNORE)
> > > echo strftime("%c") " this for debugging
> > > endfunction
> > >
> > > [1] http://vim.wikia.com/wiki/Timer_to_execute_commands_periodically
> > >
> >
> > I confirm as follows:
> >
> > I tried
> >
> > :augroup clock
> > :au CursorHold * call feedkeys("\x80\xFD\x35") | echon strftime('%c') " "
> > :augroup END
> >
> > both in gvim (with &enc == "utf-8") and in konsole (with &enc ==
> > "Latin1") and saw the datestamp displayed only once while I kept hands
> > off the keyboard & mouse.
> >
> > In both cases, Huge version 7.2.411, compiled with GTK2/Gnome2 GUI;
> > 'updatetime' is set to 4000 (the default).
> >
> >
> > Maybe I missed something too?
>
> This was changed in patch 7.2.025:
>
> Patch 7.2.025
> Problem: When a CursorHold event invokes system() it is retriggered over
> and over again.
> Solution: Don't reset did_cursorhold when getting K_IGNORE.
> Files: src/normal.c
>
>
> You can use something like "f\e" instead:
>
> autocmd CursorHold * call Timer()
> function! Timer()
> call feedkeys("f\e")
> echo strftime("%c") " this for debugging
> endfunction
>
> This starts a "f" command and then cancels it with Esc.
> Does that have more side effects? We could add something like CTRL-\
> CTRL-N that doesn't do anything. Much better than using an undocumented
> key code.
>
> --
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> [real standing laws in Connecticut, United States of America]
>
> /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net \\\
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Unfortunately, calling \e will cancel any window command or map. Worse yet, some commands are canceled and others are not depending on how fast the user types and when the sequence was started in relation to the periodic \e. Some other solution would be much appreciated.

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