[PATCH] sha1_name: support sha1^{note} to return note sha-1

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 It may be useful for scripting, and looks nice. Though may be not
 worth adding if there are no actual users.

 Documentation/revisions.txt |    1 +
 sha1_name.c                 |   15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/Documentation/revisions.txt b/Documentation/revisions.txt
index 1725661..5a671fe 100644
--- a/Documentation/revisions.txt
+++ b/Documentation/revisions.txt
@@ -114,6 +114,7 @@ the '$GIT_DIR/refs' directory or from the '$GIT_DIR/packed-refs' file.
   object of that type is found or the object cannot be
   dereferenced anymore (in which case, barf).  '<rev>{caret}0'
   is a short-hand for '<rev>{caret}\{commit\}'.
+  A special type "note" can be used to return the note object.
 
 '<rev>{caret}\{\}', e.g. 'v0.99.8{caret}\{\}'::
   A suffix '{caret}' followed by an empty brace pair
diff --git a/sha1_name.c b/sha1_name.c
index c633113..02d28df 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -6,6 +6,7 @@
 #include "tree-walk.h"
 #include "refs.h"
 #include "remote.h"
+#include "notes.h"
 
 static int get_sha1_oneline(const char *, unsigned char *, struct commit_list *);
 
@@ -473,7 +474,19 @@ static int peel_onion(const char *name, int len, unsigned char *sha1)
 		expected_type = OBJ_NONE;
 	else if (sp[0] == '/')
 		expected_type = OBJ_COMMIT;
-	else
+	else if (!strncmp("note}", sp, 5)) {
+		const unsigned char *note;
+		struct notes_tree t;
+		if (get_sha1_1(name, sp - name - 2, outer))
+			return -1;
+		memset(&t, 0, sizeof(t));
+		init_notes(&t, NULL, NULL, 0);
+		note = get_note(&t, outer);
+		if (note)
+			hashcpy(sha1, note);
+		free_notes(&t);
+		return note ? 0 : -1;
+	} else
 		return -1;
 
 	if (get_sha1_1(name, sp - name - 2, outer))
-- 
1.7.8.36.g69ee2