From bcffb8ae7304e113c5a8b6b65f9dc06587b1a67e Mon Sep 17 00:00:00 2001
From: Juanma Barranquero <lekktu@gmail.com>
Date: Tue, 11 Feb 2003 23:45:21 +0000
Subject: [PATCH] (makefile-font-lock-keywords): Fontify single character
 variable references, but protect shell variables references. (makefile-mode):
 Make `$' be punctuation in font-lock-defaults.

---
 lisp/progmodes/make-mode.el | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/lisp/progmodes/make-mode.el b/lisp/progmodes/make-mode.el
index 4d825f83239..98a3d460884 100644
--- a/lisp/progmodes/make-mode.el
+++ b/lisp/progmodes/make-mode.el
@@ -268,13 +268,16 @@ not be enclosed in { } or ( )."
    ;; Do dependencies.  These get the function name face.
    (list makefile-dependency-regex 1 'font-lock-function-name-face)
 
-   ;; Variable references even in targets/strings/comments:
+   ;; Variable references even in targets/strings/comments.
    '("\\$[({]\\([-a-zA-Z0-9_.]+\\)[}):]" 1 font-lock-constant-face prepend)
 
-   ;; Automatic variable references.
-   '("\\$\\([@%<?^+*]\\)" 1 font-lock-reference-face prepend)
+   ;; Automatic variable references and single character variable references...
+   '("\\$\\([@%<?^+*_]\\|[a-zA-Z0-9]\\>\\)" 1 font-lock-reference-face prepend)
    '("\\$[({]\\([@%<?^+*][FD]?\\)[}):]" 1 font-lock-reference-face prepend)
 
+   ;; ...but not shell variables references.
+   '("\\$\\$\\(\\sw+\\)" 1 'default t)
+
    ;; Fontify conditionals and includes.
    ;; Note that plain `if' is an automake conditional, and not a bug.
    (list
@@ -586,7 +589,7 @@ Makefile mode can be configured by modifying the following variables:
 	;; SYNTAX-BEGIN set to backward-paragraph to avoid slow-down
 	;; near the end of a large buffer, due to parse-partial-sexp's
 	;; trying to parse all the way till the beginning of buffer.
-	'(makefile-font-lock-keywords nil nil nil backward-paragraph))
+        '(makefile-font-lock-keywords nil nil ((?$ . ".")) backward-paragraph))
 
   ;; Add-log.
   (make-local-variable 'add-log-current-defun-function)
-- 
2.30.2