[PATCH v2 1/2] diff: "lisp" userdiff_driver

From: Scott L. Burson via GitGitGadget <gitgitgadget@gmail.com>
Date: Nov 27, 2025, 02:38 UTC
Message-ID: <da99bb0bcd8c92e0d6de8b929b67095fae251f88.1764211096.git.gitgitgadget@gmail.com>
In-Reply-To: <pull.2000.v2.git.1764211096.gitgitgadget@gmail.com>

From: "Scott L. Burson" <Scott@sympoiesis.com>

The "scheme" driver doesn't quite work for Common Lisp. This driver is very generic and should work for almost any dialect of Lisp, including Common Lisp.

Signed-off-by: Scott L. Burson <Scott@sympoiesis.com>
---
 userdiff.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/userdiff.c b/userdiff.c
index fe710a68bf..e127b4a1f1 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -249,6 +249,14 @@ PATTERNS("kotlin",
 	 "|[.][0-9][0-9_]*([Ee][-+]?[0-9]+)?[fFlLuU]?"
 	 /* unary and binary operators */
 	 "|[-+*/<>%&^|=!]==?|--|\\+\\+|<<=|>>=|&&|\\|\\||->|\\.\\*|!!|[?:.][.:]"),
+PATTERNS("lisp",
+	 /* Either an unindented left paren, or a slightly indented line
+	  * starting with "(def" */
+	 "^((\\(|:space:{1,2}\\(def).*)$",
+	 /* Common Lisp symbol syntax allows arbitrary strings between vertical bars */
+	 "\\|([^\\\\]|\\\\\\\\|\\\\\\|)*\\|"
+	 /* All other words are delimited by spaces or parentheses/brackets/braces */
+	 "|([^][(){} \t])+"),
 PATTERNS("markdown",
 	 "^ {0,3}#{1,6}[ \t].*",
 	 /* -- */

-- 
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