Teach git diff about Objective-C syntax

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>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 2ae771f2fb213a478cf8ed5273829c97ad1392a9..26945593cb1739bb6a6e1e2acc2cd78caab3a102 100644 (file)
--- 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 02e948c9dd6244a0003c2c6bc81f55e46cf0ad2b..2af3a974872e3bafeead339503a0d1eab051779d 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -1429,6 +1429,16 @@ static const struct funcname_pattern_entry builtin_funcname_pattern[] = {
          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
          "^[ \t]*(([ \t]*[A-Za-z_][A-Za-z_0-9]*){2,}[ \t]*\\([^;]*)$",
          REG_EXTENDED },
+       { "objc",
+         /* Negate C statements that can look like functions */
+         "!^[ \t]*(do|for|if|else|return|switch|while)\n"
+         /* Objective-C methods */
+         "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
+         /* C functions */
+         "^[ \t]*(([ \t]*[A-Za-z_][A-Za-z_0-9]*){2,}[ \t]*\\([^;]*)$\n"
+         /* Objective-C class/protocol definitions */
+         "^(@(implementation|interface|protocol)[ \t].*)$",
+         REG_EXTENDED },
        { "pascal",
          "^((procedure|function|constructor|destructor|interface|"
                "implementation|initialization|finalization)[ \t]*.*)$"