GNU bug report logs - #59868
28.2.50; compilation-search-path incompatible with dir-locals

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Len Trigg <lenbok <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.2.50; compilation-search-path incompatible with dir-locals
Date: Wed, 7 Dec 2022 14:56:25 +1300

[Message part 1 (text/plain, inline)]

The compilation-search-path variable purports to let the user specify a
list of directories to search when resolving file names found in
compilation error messages. As such this very much should be possible to
specify as a project-specific setting. However, setting this variable in
per-project .dir-locals.el file does not work. When a compilation buffer
is created, the local value is not obeyed (I have my dir locals file setting
this variable regardless of the major mode, and I see the variable being
set in regular modes just fine - it seems to be just compilation mode with
the problem). I am not an expert, but it may be due to compilation mode
calling kill-all-local-variables that prevents this from working as
expected.



In GNU Emacs 28.2.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20,
cairo version 1.16.0)
 of 2022-09-27 built on tron
Repository revision: 00159c086c64147798a4c64bf5d9b94c7e8939de
Repository branch: emacs-28
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: Ubuntu 20.04.5 LTS

Configured using:
 'configure --prefix=/home2/len/.local --with-xwidgets --with-rsvg
 --with-cairo --with-native-compilation'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG
SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM XWIDGETS
GTK3 ZLIB

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[Message part 2 (text/html, inline)]

Message #8 received at 59868 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Len Trigg <lenbok <at> gmail.com>
Cc: 59868 <at> debbugs.gnu.org
Subject: Re: bug#59868: 28.2.50;
 compilation-search-path incompatible with dir-locals
Date: Wed, 07 Dec 2022 15:01:17 +0200

severity 59868 wishlist
thanks

> From: Len Trigg <lenbok <at> gmail.com>
> Date: Wed, 7 Dec 2022 14:56:25 +1300
> 
> The compilation-search-path variable purports to let the user specify a
> list of directories to search when resolving file names found in
> compilation error messages. As such this very much should be possible to
> specify as a project-specific setting. However, setting this variable in
> per-project .dir-locals.el file does not work. When a compilation buffer
> is created, the local value is not obeyed (I have my dir locals file setting
> this variable regardless of the major mode, and I see the variable being
> set in regular modes just fine - it seems to be just compilation mode with
> the problem). I am not an expert, but it may be due to compilation mode
> calling kill-all-local-variables that prevents this from working as expected.

I don't think this variable is meant to be buffer-local in
*compilation* buffers.  If project.el wants to provide a project-local
value for this search path, it should define a new variable for that,
and then compilation-mode can set its own variable from that.

Message #13 received at 59868 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Len Trigg <lenbok <at> gmail.com>
Cc: 59868 <at> debbugs.gnu.org
Subject: Re: bug#59868: 28.2.50;
 compilation-search-path incompatible with dir-locals
Date: Fri, 09 Dec 2022 09:06:47 +0200

> From: Len Trigg <lenbok <at> gmail.com>
> Date: Fri, 9 Dec 2022 13:49:03 +1300
> 
> On Thu, 8 Dec 2022 at 02:01, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
>  I don't think this variable is meant to be buffer-local in
>  *compilation* buffers.  If project.el wants to provide a project-local
>  value for this search path, it should define a new variable for that,
>  and then compilation-mode can set its own variable from that.
> 
> I'm not using project.el at all, this is simply using a .dir-locals.el in the root of my project to set
> project-specific variables.

You are ignoring the first sentence in my response, right?

The rest was a suggestion (and I do see a good reason why project.el
would like to provide this as a project-specific setting).

More generally, why would you want a directory-specific value for this
variable, if it isn't something the entire directory tree shares?

Maybe you should tell why you need to tell Emacs where to find the
sources?  Doesn't the tool you use to compile spell that out?

P.S. And please use Reply All to keep the bug tracker on the CC list,
so that this discussion gets recorded by the bug tracker.

Message #16 received at 59868 <at> debbugs.gnu.org (full text, mbox):

From: Len Trigg <lenbok <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 59868 <at> debbugs.gnu.org
Subject: Re: bug#59868: 28.2.50;
 compilation-search-path incompatible with dir-locals
Date: Sat, 10 Dec 2022 08:11:10 +1300

[Message part 1 (text/plain, inline)]

On Fri, 9 Dec 2022 at 20:06, Eli Zaretskii <eliz <at> gnu.org> wrote:

> You are ignoring the first sentence in my response, right?
>

 I don't think so - the purpose of my email was essentially to ask why you
thought the variable shouldn't be buffer-local in *compilation* buffers.
I'm hoping to see where my mental model of using .dir-locals.el and/or
buffer-local variables is at odds with how emacs intends. The user manual
for both of these make it seem like this would be a perfect fit.


The rest was a suggestion (and I do see a good reason why project.el
> would like to provide this as a project-specific setting).
>
> More generally, why would you want a directory-specific value for this
> variable, if it isn't something the entire directory tree shares?
>

From my understanding, settings in .dir-locals.el *do* affect the whole
directory tree under the directory containing the file (and I'm happy for
that to be the case here). I think of .dir-locals.el in the project root as
the preferred way of specifying project-wide settings, and of
project.el/projectile.el as primarily providing meta functionality (e.g.
cross projects, or multi-file within a project). (I would also perhaps
naively expect that project.el would in turn get its project-wide settings
via that .dir-locals.el, at least that is how I have done it for projects
where I've needed to customize projectile settings (sorry, I haven't tried
project.el yet)).


Maybe you should tell why you need to tell Emacs where to find the
> sources?  Doesn't the tool you use to compile spell that out?
>

In my specific case the project is in R (which is a terrible language for
software development) and we are using a single top level makefile in the
project. It has a target to run linting, which (within each R linter
invocation) lints from a subdirectory, and the filenames in each lint
message are relative to those directories. There is not the hierarchy of
makefiles that you would often see in say C projects, where compilation
mode could parse make-issued messages about changing directories etc. It
seemed a perfect fit for compilation-search-path. I am currently working
around it with the following ugliness in my .dir-locals.el:

(
 (compilation-mode . ((eval . (progn
                                (setq-local compilation-search-path '(
                                              "~/sandboxes/myproject/R"
                                              "~/sandboxes/myproject/tests"
                                              ))
                                (put 'compilation-search-path
'permanent-local t)
                                (compilation-mode))))))


Cheers,
Len.

[Message part 2 (text/html, inline)]

Message #19 received at 59868 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Len Trigg <lenbok <at> gmail.com>
Cc: 59868 <at> debbugs.gnu.org
Subject: Re: bug#59868: 28.2.50;
 compilation-search-path incompatible with dir-locals
Date: Sat, 10 Dec 2022 16:02:00 +0200

> From: Len Trigg <lenbok <at> gmail.com>
> Date: Sat, 10 Dec 2022 08:11:10 +1300
> Cc: 59868 <at> debbugs.gnu.org
> 
>  You are ignoring the first sentence in my response, right?
> 
>  I don't think so - the purpose of my email was essentially to ask why you thought the variable shouldn't be
> buffer-local in *compilation* buffers.

Because from the pattern we use the *compilation* buffer it is clear
that it cannot be buffer-local.  The *compilation* buffer is reused by
each new compilation, so local setting there makes no sense.

> In my specific case the project is in R (which is a terrible language for software development) and we are
> using a single top level makefile in the project. It has a target to run linting, which (within each R linter
> invocation) lints from a subdirectory, and the filenames in each lint message are relative to those
> directories. There is not the hierarchy of makefiles that you would often see in say C projects, where
> compilation mode could parse make-issued messages about changing directories etc. It seemed a perfect
> fit for compilation-search-path. I am currently working around it with the following ugliness in my
> .dir-locals.el:

Why cannot you have all the possible directories in the list?

Message #22 received at 59868 <at> debbugs.gnu.org (full text, mbox):

From: Len Trigg <lenbok <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 59868 <at> debbugs.gnu.org
Subject: Re: bug#59868: 28.2.50;
 compilation-search-path incompatible with dir-locals
Date: Sun, 11 Dec 2022 11:01:53 +1300

[Message part 1 (text/plain, inline)]

On Sun, 11 Dec 2022 at 03:02, Eli Zaretskii <eliz <at> gnu.org> wrote:

> Because from the pattern we use the *compilation* buffer it is clear
> that it cannot be buffer-local.  The *compilation* buffer is reused by
> each new compilation, so local setting there makes no sense.
>

Ahhh, right, thanks. My current hack would not work as expected if I switch
to another project and compile that without first killing the previous
*compilation* buffer, since it would have the previous project settings. So
to be project aware I guess I would somehow need to set the
compilation-search-path from compilation-start-hook?


> Why cannot you have all the possible directories in the list?
>

Do you mean all directories for the current project, or all directories
across all projects? If the former, that's exactly what I want. If the
latter, that seems prone to incorrectly resolving the source file for a
message as coming from a project other than the current (particularly for
generic filenames like "utils.c") and additionally I try not to have
anything project specific in my global emacs init, they should live in the
project repo (and .dir-locals.el is the only mechanism I'm aware of for
that).

Cheers,
Len.

[Message part 2 (text/html, inline)]

Message #25 received at 59868 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Len Trigg <lenbok <at> gmail.com>
Cc: 59868 <at> debbugs.gnu.org
Subject: Re: bug#59868: 28.2.50;
 compilation-search-path incompatible with dir-locals
Date: Sun, 11 Dec 2022 09:14:12 +0200

> From: Len Trigg <lenbok <at> gmail.com>
> Date: Sun, 11 Dec 2022 11:01:53 +1300
> Cc: 59868 <at> debbugs.gnu.org
> 
>  Because from the pattern we use the *compilation* buffer it is clear
>  that it cannot be buffer-local.  The *compilation* buffer is reused by
>  each new compilation, so local setting there makes no sense.
> 
> Ahhh, right, thanks. My current hack would not work as expected if I switch to another project and compile
> that without first killing the previous *compilation* buffer, since it would have the previous project settings. So
> to be project aware I guess I would somehow need to set the compilation-search-path from
> compilation-start-hook?

Something like that.  That's why I thought about project.el: it is
already sensitive to project changes.

>  Why cannot you have all the possible directories in the list?
> 
> Do you mean all directories for the current project, or all directories across all projects? If the former, that's
> exactly what I want. If the latter, that seems prone to incorrectly resolving the source file for a message as
> coming from a project other than the current (particularly for generic filenames like "utils.c") and additionally I
> try not to have anything project specific in my global emacs init, they should live in the project repo (and
> .dir-locals.el is the only mechanism I'm aware of for that).

I didn't mean global init, I meant the single .dir-locals.el file in
the top-level directory of all your R projects (which AFAIU share a
common parent directory).  Is having files named the same in different
sub-projects a real danger in that case?

But I agree this is not a comprehensive solution.  I still think the
comprehensive one should be provided by project.el, since it already
has infrastructure for these situations.  For example, you can
consider files under a certain directory to belong to a project.

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