[PATCH 1/2] userdiff: add support for R programming language

[Rodrigo Carvalho <rodrigorsdc@gmail.com>]

The patch appends userdiff.c file in order to support R programming
language function header. This will be useful for those who use Git
for versioning .R files.

Signed-off-by: Rodrigo Carvalho <rodrigorsdc@gmail.com>
---
 userdiff.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/userdiff.c b/userdiff.c
index da75625020..d1d31ea67e 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -317,6 +317,10 @@ PATTERNS("python",
 	 "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 	 "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 	 /* -- */
+PATTERNS("r",
+	"^[ \t]*([a-zA-z][a-zA-Z0-9_.]*[ \t]*<-[ \t]*function.*)$",
+	/* -- */
+	"[a-zA-Z_][a-zA-Z0-9_.]*"),
 PATTERNS("ruby",
 	 "^[ \t]*((class|module|def)[ \t].*)$",
 	 /* -- */
-- 
2.43.0