Bug 346653

Summary:	app-emacs/ebuild-mode: highlight /etc/portage/make.conf better
Product:	Gentoo Linux	Reporter:	Yu Yuwei <acevery>
Component:	Current packages	Assignee:	Emacs project <emacs>
Status:	CONFIRMED ---
Severity:	enhancement	CC:	sam
Priority:	Normal	Keywords:	NeedPatch
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Yu Yuwei 2010-11-24 14:04:22 UTC

I shifted from vim recently, and wish app-emacs/gentoo-syntax can provide better syntax-highlight for the USE flags in /etc/make.conf.

For example:
USE="emacs -vim"
The "emacs" in blue color and "-vim" in red color, or some other colors.

Thanks!

Reproducible: Always

Comment 1 Ulrich Müller gentoo-dev

2011-01-29 10:21:46 UTC

I haven't found time for this yet, and most probably won't in the next future.

Patches are welcome.

Comment 2 Ulrich Müller gentoo-dev

2023-08-31 13:29:32 UTC

Emacs doesn't use ebuild-mode for make.conf, but conf-unix-mode. For the requested highlighting, one would have to add "USE=" and the flag syntax to the font-lock keywords of that mode (or a mode derived from it), most likely something of the form "(matcher . anchored-highlighter)". See the Elisp Reference Manual:
https://www.gnu.org/software/emacs/manual/html_node/elisp/Search_002dbased-Fontification.html

A complication is that a variable assignment in make.conf can span multiple lines, therefore the standard line-based approach won't work. A possible solution to this is outlined here:
https://www.gnu.org/software/emacs/manual/html_node/elisp/Multiline-Font-Lock.html

Also, comment #1 still applies.