Adding a file: syntax colouring for Autoconf files.

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5367 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

+2015-08-29  Benno Schulenberg  <bensberg@justemail.net>
+	* doc/syntax/autoconf.nanor: New file; syntax colouring for Autoconf.
+
 2015-08-16  Benno Schulenberg  <bensberg@justemail.net>
 	* src/help.c (help_init, help_line_len): Avoid wide paragraphs of text
 	in the help screens: wrap them at 74 columns if the screen is wider.
@@ -12,7 +15,7 @@
 	* src/nano.c (make_new_opennode), src/files.c (initialize_buffer):
 	Remove some duplication in the initialization of a new openfile node.
 	* src/nano.c (make_new_opennode): Don't bother setting things to NULL
-	when they will be intialized right away.
+	when they will be initialized right away.
 	* src/files.c (make_new_buffer): Don't bother with a separate function
 	when it's used only once, right there.
 	* src/help.c (help_init): Since the new SIGWINCH handling, a resizing

doc/syntax/autoconf.nanorc

+## Here is an example for Autoconf.
+
+syntax "autoconf" "\.ac$"
+
+# Keywords:
+color yellow "\<(if|test|then|else|fi|for|in|do|done)\>"
+color yellow "(=|!=|&&|\|\|)"
+
+# Macros:
+color cyan "\<[[:upper:]_[:digit:]]+\>"
+
+# Version numbers:
+color red "\<[-_.0-9]+\>"
+
+# Strings:
+color red "\"[^"]*\""  "\'[^']*\'"
+
+# Backticks:
+color green "`[^`]*`"
+
+# Error lines:
+color black "^\*\*\*.*"
+
+# Brackets:
+color magenta "\[|\]|\(|\)"
+
+# Comments:
+color blue "^[[:blank:]]*#.*"  "^dnl.*"