GNU bug report logs - #76759
[PATCH] 31.0.50; makefile-mode: incorrectly highlights make-instructions as make targets

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Subject: bug#45037: closed (Re: bug#76759: [PATCH] 31.0.50; makefile-mode:
 incorrectly highlights make-instructions as make targets)
Date: Mon, 10 Mar 2025 02:17:07 +0000

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Your bug report

#76759: Makefiles <TAB>...: gets wrong color

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 45037 <at> debbugs.gnu.org.

-- 
76759: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=76759
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Jostein Kjønigsen <jostein <at> secure.kjonigsen.net>
Cc: "Dr. Arne Babenhauserheide" <arne_bab <at> web.de>, "Ergus via Emacs
 development discussions." <emacs-devel <at> gnu.org>,
 Mauro Aranda <maurooaranda <at> gmail.com>, 76759-done <at> debbugs.gnu.org
Subject: Re: bug#76759: [PATCH] 31.0.50; makefile-mode: incorrectly
 highlights make-instructions as make targets
Date: Sun, 09 Mar 2025 22:08:04 -0400

> Any news on this one?

Looks OK, tho I think it's a bit more strict than necessary: the TABs we
need to avoid can be only at the beginning of the line, so not inside
the $(...).

So it's only one of the [^...] that needs the \t.

Here's what I did:

- Start from the current monster:

    "^\\(\\(?:\\$\\(?:[({]\\(?:\\$\\(?:[({]\\(?:\\$\\(?:[^({]\\|.[^\n$#})]+?[})]\\)\\|[^\n$#)}]\\)+?[})]\\|[^({]\\)\\|[^\n$#)}]\\)+?[})]\\|[^({]\\)\\|[^\n$#:=]\\)+?\\)\\(:\\)\\(?:[ \t]*$\\|[^=\n]\\(?:[^#\n]*?;[ \t]*\\(.+\\)\\)?\\)"

- Change the `\\(?:[^({]\\|.` to `\\(?:[^({]\\|[({]` because I think
  the `.` was just an optimization.  And since the two alternatives are
  now mutually exclusive, swap them:

    \\(?:[^({]\\|.[^\n$#})]+?[})]\\)

=>

    \\(?:[({][^\n$#})]+?[})]\\|[^({]\\)

- Now the regexp has become:

    "^\\(\\(?:\\$\\(?:[({]\\(?:\\$\\(?:[({]\\(?:\\$\\(?:[({][^\n$#})]+?[})]\\|[^({]\\)\\|[^\n$#)}]\\)+?[})]\\|[^({]\\)\\|[^\n$#)}]\\)+?[})]\\|[^({]\\)\\|[^\n$#:=]\\)+?\\)\\(:\\)\\(?:[ \t]*$\\|[^=\n]\\(?:[^#\n]*?;[ \t]*\\(.+\\)\\)?\\)"

- Make the nested construction explicit, so it's a bit more manageable:

    (letrec ((elems-re
              (lambda (n &optional outer)
                (if (< n 1)
                     "[^\n$#})]+?"
                  (concat "\\(?:\\$\\(?:"
                          "[({]" (funcall elems-re (- n 1)) "[})]"
                          "\\|[^({]\\)"
                          "\\|[^\n$#" (if outer ":=" ")}") "]\\)+?")))))
      (concat
       ;; Allow for two nested levels $(v1:$(v2:$(v3:a=b)=c)=d)
       "^\\(" (funcall elems-re 3 'outer)
       "\\)\\(:\\)\\(?:[ \t]*$\\|[^=\n]\\(?:[^#\n]*?;[ \t]*\\(.+\\)\\)?\\)"))

- Disallow TABs in the outer case by replacing ":=" with "\t:=" (that's
  one of the TABs you added in your version of the patch).

This is still not quite right, since AFAIK TABs are allowed to appear
outside of $(...) as long as they're not at BOL, but I think it's better
than what we've had so far (and the regexp still has several other
limitations anyway).

Pushed to `master`.


        Stefan

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From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-gnu-emacs <at> gnu.org
Subject: Makefiles <TAB>...: gets wrong color
Date: Fri, 04 Dec 2020 09:19:23 +0800

$ cat Makefile
u:
	for u in ha jia fen ping; do echo -n $$u:; \
	units --one-line --compact $m $$u; done
$ emacs -nw -Q Makefile

The 'for' line is in the wrong color.

Probably triggered by the colon near the end.

But there is a tab at the front of the line!

So it should know better.

emacs-version "27.1"

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