Subject: [PATCH v2 04/29] tree-walk.h: add object_type member to name_entry

From: Ævar Arnfjörð Bjarmason <[email-masked]>
Date: Tue, 16 Mar 2021 03:12:47 +0100

Most users of the tree walking API don't care what the specific mode
of an object in a tree is (e.g. if it's executable), they care if it's
one of OBJ_{TREE,BLOB,COMMIT}.

Let's add an "object_type" enum to the "name_entry" struct to help
such callers.

Ideally we'd have some subset of "enum object_type" here with just
those three entries, so we could rely on the C compiler to
exhaustively check our "switch" statements, but I don't know how to
create such a enum subset without re-labeling OBJ_{TREE,BLOB,COMMIT}
to e.g. "NE_OBJ_*" (an enum is just an int under the hood, so you can
use such a struct with "OBJ_*", but the compiler will complain...).

Signed-off-by: Ævar Arnfjörð Bjarmason <[email-masked]>
---
 tree-walk.c | 4 +++-
 tree-walk.h | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/tree-walk.c b/tree-walk.c
index 2d6226d5f18..b210967b73b 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -47,7 +47,9 @@ static int decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned l
 
 	/* Initialize the descriptor entry */
 	desc->entry.path = path;
-	desc->entry.mode = canon_mode(mode);
+	mode = canon_mode(mode);
+	desc->entry.mode = mode;
+	desc->entry.object_type = object_type(mode);
 	desc->entry.pathlen = len - 1;
 	hashcpy(desc->entry.oid.hash, (const unsigned char *)path + len);
 
diff --git a/tree-walk.h b/tree-walk.h
index a5058469e9b..9f3825d2773 100644
--- a/tree-walk.h
+++ b/tree-walk.h
@@ -17,6 +17,8 @@ struct name_entry {
 	const char *path;
 	int pathlen;
 	unsigned int mode;
+	/* simple 'mode': Only OBJ_{BLOB,TREE,COMMIT} */
+	enum object_type object_type;
 };
 
 /**
-- 
2.31.0.rc2.211.g1d0b8788b3