From ae4ef72755d559c19665d1bb8325c42558bd4172 Mon Sep 17 00:00:00 2001
From: Craig Jennings <c@cjennings.net>
Date: Fri, 14 Nov 2025 12:40:38 -0600
Subject: apply undercurl patch for enhanced underline styles

Applied st-undercurl-0.9-20240103.diff cleanly with offset adjustments.

Benefits:
- Adds support for curly/wavy underlines (undercurl)
- Custom underline colors via SGR escape codes
- Compatible with Vim/NeoVim LSP diagnostics and spell-check
- Supports standard terminal features used by most modern terminals

Use cases:
- Editor spell-check with wavy underlines
- LSP warnings/errors with colored underlines
- Enhanced visual feedback in terminal applications
---
 config.def.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'config.def.h')

diff --git a/config.def.h b/config.def.h
index 6a86df4..23496b2 100644
--- a/config.def.h
+++ b/config.def.h
@@ -498,3 +498,27 @@ static char ascii_printable[] =
 	" !\"#$%&'()*+,-./0123456789:;<=>?"
 	"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"
 	"`abcdefghijklmnopqrstuvwxyz{|}~";
+
+/**
+ * Undercurl style. Set UNDERCURL_STYLE to one of the available styles.
+ *
+ * Curly: Dunno how to draw it *shrug*
+ *  _   _   _   _
+ * ( ) ( ) ( ) ( )
+ *	 (_) (_) (_) (_)
+ *
+ * Spiky:
+ * /\  /\   /\	/\
+ *   \/  \/	  \/
+ *
+ * Capped:
+ *	_     _     _
+ * / \   / \   / \
+ *    \_/   \_/
+ */
+// Available styles
+#define UNDERCURL_CURLY 0
+#define UNDERCURL_SPIKY 1
+#define UNDERCURL_CAPPED 2
+// Active style
+#define UNDERCURL_STYLE UNDERCURL_SPIKY
-- 
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