Commit: patch 9.0.1767: '.-' no allowed in highlight group names

[Christian Brabandt]

patch 9.0.1767: '.-' no allowed in highlight group names

Commit: https://github.com/vim/vim/commit/d4376dc3ebea91abcb4d9ef9963ef5b968048b78
Author: Gregory Anders <gr...@gpanders.com>
Date: Sun Aug 20 19:14:03 2023 +0200

patch 9.0.1767: '.-' no allowed in highlight group names

Problem: '.-' no allowed in highlight group names
Solution: Allow dot and hyphen characters in highlight group names

Allow dots and hyphens in group names. There does not seem
to be any reason for these to be disallowed.

closes: #12807

Signed-off-by: Christian Brabandt <c...@256bit.org>
Co-authored-by: Gregory Anders <gr...@gpanders.com>
Co-authored-by: Sean Dewar <sean...@users.noreply.github.com>

diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 8a5e5f4c9..17f81391a 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -214,10 +214,10 @@ A syntax group name is to be used for syntax items that match the same kind of
thing. These are then linked to a highlight group that specifies the color.
A syntax group name doesn't specify any color or attributes itself.

-The name for a highlight or syntax group must consist of ASCII letters, digits
-and the underscore. As a regexp: "[a-zA-Z0-9_]*". However, Vim does not give
-an error when using other characters. The maximum length of a group name is
-about 200 bytes. *E1249*
+The name for a highlight or syntax group must consist of ASCII letters,
+digits, underscores, dots, or hyphens. As a regexp: "[a-zA-Z0-9_.-]*".
+However, Vim does not give an error when using other characters. The maximum
+length of a group name is about 200 bytes. *E1249*

To be able to allow each user to pick their favorite set of colors, there must
be preferred names for highlight groups that are common for many languages.
diff --git a/src/highlight.c b/src/highlight.c
index 3773ddf70..8b1e832d7 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -3452,7 +3452,7 @@ syn_add_group(char_u *name)
char_u *p;
char_u *name_up;

- // Check that the name is ASCII letters, digits and underscore.
+ // Check that the name is valid (ASCII letters, digits, underscores, dots, or hyphens).
for (p = name; *p != NUL; ++p)
{
if (!vim_isprintc(*p))
@@ -3461,7 +3461,7 @@ syn_add_group(char_u *name)
vim_free(name);
return 0;
}
- else if (!ASCII_ISALNUM(*p) && *p != '_')
+ else if (!ASCII_ISALNUM(*p) && *p != '_' && *p != '.' && *p != '-')
{
// This is an error, but since there previously was no check only
// give a warning.
diff --git a/src/version.c b/src/version.c
index 056dc2967..e6f41a4a2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -695,6 +695,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 1767,
/**/
1766,
/**/