Re: [Emacs-diffs] /srv/bzr/emacs/trunk r99848: (compilation-save-buffers-predicate):

[Sam Steingold <sds@gnu.org>]

> * Stefan Monnier <zbaavre@veb.hzbagerny.pn> [2010-04-09 21:04:37 -0400]:
>
>>>>> - I like where this is going, but I'm not sure this is enough.
>>>>> Could you explain how you see it being used?
>>>> if you edit a huge file which is expensive to save, you do not want it
>>>> to be saved whenever you start a compilation elsewhere.
>>> ;-) that part I understand of course.
>>> But I mean what value do you expect users to use it with?
>>> Would they globally set it to save one particular directory of theirs?
>>> What if they have more than one project?
>> this is problematic because compile does not announce what it's working
>> directory is.
>
> Any reason why we can't fix that?

no, and here is a solution:

>> I can add a variable compile-default-directory which will be nil globally
>> and bound to default-directory in compile and recompile; then the users will
>> be able to set compilation-save-buffers-predicate to
>> (lambda ()
>>  (string-prefix-p
>>    (locate-dominating-file compile-default-directory "foo")
>>    (file-truename (buffer-file-name))))
>> so that only files located in the currently compiled project are saved.
>> here "foo" should identify the project root, it can be, e.g., "configure" or
>> "COPYING" or "README" or "OMakeroot" or "ANNOUNCE".
>> we can also use "bzr root"/"hg root" instead of locate-dominating-file.
>> this, however, becomes more and more expensive.
>
> How 'bout this:
> - we provide some way for the user to explain to compile.el how to find
>   her projects's root directories (e.g. a list of tell-tale file names).

this is tricky: some files might be ordinary for some projects and the
tell-tale for others.

> - and we can also provide an option to "cd to project's root before
>   running the command".

I doubt the value of this.

> How does that sound?

fine.
gonna do it?

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