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

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

From: Jostein Kjønigsen <jostein <at> secure.kjonigsen.net>
To: bug-gnu-emacs <at> gnu.org
Cc: "Ergus via Emacs development discussions." <emacs-devel <at> gnu.org>
Subject: [PATCH] 31.0.50; makefile-mode: incorrectly highlights
 make-instructions as make targets
Date: Wed, 5 Mar 2025 10:32:39 +0100

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

Hey everyone.

I found a bug in makefile-mode fontification.

Currently shell-commands/make-instructions within a target may get fontified as make-targets if they contain a : (colon) sign.

Consider the following make-target:

------- Makefile ------

run-docker: build-docker
	docker run -p 8080:8080 imagename

--------------------------

This defined a make-target called "run-docker" which depends on "build-docker", which runs the command "docker run -p 8080:8080 imagename".

In the current code, since the command contains a ":" the whole text up to that point ("docker run -p 8080") gets fontified as a make-target, even though it's clearly not declared at the beginning of the line.

Based on my digging, this seems to be due to the matching criteria defined in makefile-dependency-regex.

A common pattern used in this regex is "[^\n$#]" (with slight variations), which (from how I read regexps) aims to match anything which is not a lineshift, a $-sign or a #-sign.

"Anything" in this case would then also include whitespace, which IMO is the source of the bug.

I've tried changing this part of the statement in parts of the regex to "[^\n\s$#]", like in the attached patch. Ie also exclude leading whitespace. From what I've tested, it does not seem to have any adverse effects, although I may not have tested all areas affected by this change.

Feel free to test the suggested changes, and let me know if they can be improved in any way.


—
Kind Regards
Jostein Kjønigsen


In GNU Emacs 31.0.50 (build 19, aarch64-apple-darwin24.3.0, NS
 appkit-2575.40 Version 15.3.1 (Build 24D70)) of 2025-03-03 built on
 SOK67R3KWV97
Repository revision: 38ed2238316a83ad2c95db04f115c38ade48514f
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2575
System Description:  macOS 15.3.1

Configured using:
 'configure --with-tree-sitter --with-native-compilation
 --with-imagemagick --with-harfbuzz'

Configured features:
ACL GLIB GNUTLS IMAGEMAGICK LCMS2 LIBXML2 MODULES NATIVE_COMP NOTIFY
KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP XIM ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LC_CTYPE: UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: BSDmakefile

Minor modes in effect:
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  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  column-number-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  hs-minor-mode: t

Load-path shadows:
/Users/josteink/.emacs.d/elpa/transient-20250301.2218/transient hides /Users/josteink/build/emacs/lisp/transient

Features:
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threads kqueue cocoa ns lcms2 multi-tty make-network-process
tty-child-frames native-compile emacs)

Memory information:
((conses 16 1136723 236110) (symbols 48 57070 3)
 (strings 32 315761 12126) (string-bytes 1 9424642)
 (vectors 16 112250) (vector-slots 8 2121204 187375)
 (floats 8 1899 10828) (intervals 56 21125 6631) (buffers 992 88))

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

[0001-Fix-fontification-error-in-makefile-mode.patch (application/octet-stream, attachment)]

[Message part 4 (text/html, inline)]

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