Hi Kalle,
I'm currently revising old Emacs bugs.
On 2003-08-03 23:07 +0200, Kalle Olavi Niemitalo wrote:
> reassign 34818 emacs21
> retitle 34818 emacs21: make auto-insert return t if it inserts something
> quit
>
> Kalle Olavi Niemitalo <t...@ees2.oulu.fi> writes:
>
>> Package: emacs20
>> Version: 20.3-5
>> Severity: wishlist
>
> As emacs20 is no longer being enhanced, I reassign this wish to
> emacs21.
>
>> There's a problem, though: "The functions [in
>> `find-file-not-found-hooks'] are called in the order given until
>> one of them returns non-nil." The return value of auto-insert is
>> not documented and seems to depend on many things.
>
> In Emacs 21.1 and later, auto-insert always returns nil and has a
> comment saying this is precisely for find-file-not-found-hooks.
It also says that this is probably inadvisable, and I tend to agree.
E.g. you want to run vc-file-not-found-hook to check out a file that is
under version control but currently has no working copy. Then it's no
good to run auto-insert before that.
>> IWBNI `auto-insert' were changed to return non-nil iff it inserts
>> something.
>
> That has not yet been done. If there are other functions in
> find-file-not-found-hooks, they run even if auto-insert has
> already inserted something, because it always returns nil.
>
>> In the meantime, I think I'll write a wrapper.
>
> I have been using the following wrapper for a few years now.
>
> (add-hook 'find-file-not-found-hooks
> (lambda ()
> (auto-insert)
> ;; If something was inserted, return non-nil to signal
> ;; that no more hooks should be run.
> (> (buffer-size) 0)))
You're probably better off just using auto-insert-mode like everyone
else, since the runtime cost of that is negligible. If you want to keep
the bug open anyway, I'll probably add a wontfix tag.
Cheers,
Sven
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