Re: Why is this VimLeave autocommand causing 'E749: empty buffer' ?

On 2013-10-30, Thiago de Arruda wrote:
> I'm trying to setup vim to save all files when it receives
> SIGTERM, here's the relevant vim command:
>
> au VimLeave * if v:dying | wa | endif
>
> This should write all buffers when vim exits. From another
> terminal if I kill vim with a modified buffer I get the following
> error:
>
> Vim: Caught deadly signal TERM
> Vim: preserving files...
> Error detected while processing VimLeave Auto commands for "*":Vim: Finished.
>
> E749: empty buffer
>
> If I kill vim without modifying any buffers it doesn't report any
> error.
>
> Does anyone knows why this is happening or how to fix it(or
> another workaround for my problem: saving all files when vim
> receives SIGTERM)

I don't know the answer. My guess is that Vim has in some sense
deleted all its buffers by the time it processes the VimLeave event
so that there are no buffers to write. If you haven't modified any
buffers, Vim does not attempt to write any, so you don't encounter
the error.

":help E749" is extremely unhelpful. I learned a little by
searching the source code for "E749" and then for the variable that
contains that string, e_emptybuf.

The text around ":help VimLeave" suggests that VimLeavePre might
work better for this.

Regards,
Gary

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