[PATCH] Teach git diff about Objective-C syntax

[Jonathan del Strother <jon.delStrother@bestbefore.tv>]

Add support for recognition of Objective-C class & instance methods, C functions, and class implementation/interfaces.

Signed-off-by: Jonathan del Strother <jon.delStrother@bestbefore.tv>
---
 Documentation/gitattributes.txt |    2 ++
 diff.c                          |    6 ++++++
 2 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 6f3551d..c1f13e2 100644
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -315,6 +315,8 @@ patterns are available:
 
 - `java` suitable for source code in the Java language.
 
+- `objc` suitable for source code in the Objective-C language.
+
 - `pascal` suitable for source code in the Pascal/Delphi language.
 
 - `php` suitable for source code in the PHP language.
diff --git a/diff.c b/diff.c
index 998dcaa..5f4e63b 100644
--- a/diff.c
+++ b/diff.c
@@ -1403,6 +1403,12 @@ static struct builtin_funcname_pattern {
 			"^[ 	]*\\(\\([ 	]*"
 			"[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
 			"[ 	]*([^;]*\\)$" },
+	{ "objc", "^[\t ]*\\([-+][\t ]*([\t ]*[A-Za-z_][A-Za-z_0-9]*.*).*\\)$" /* Objective-C methods */
+			"\\|"
+			"^[\t ]*\\(\\([\t ]*[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}[\t ]*([^;]*\\)$" /* C functions */
+			"\\|"
+			"^@\\(implementation\\|interface\\|protocol\\).*" /* Objective-C class/protocol definitions */
+			},
 	{ "pascal", "^\\(\\(procedure\\|function\\|constructor\\|"
 			"destructor\\|interface\\|implementation\\|"
 			"initialization\\|finalization\\)[ \t]*.*\\)$"
-- 
1.6.0.2