[PATCH v2 1/2] [GSOC] ref-filter: add obj-type check in grab contents

["ZheNing Hu via GitGitGadget" <gitgitgadget@gmail.com>]

From: ZheNing Hu <adlternative@gmail.com>

Only tag and commit will use `grab_sub_body_contents()`
to grab object contents in origin implement. If we want
to make blob, tree can also use `grab_sub_body_contents()`
to get objects' raw data, a blob look like commit or tag
will be wrongly regarded as commit, tag by `find_subpos()`.

So we must add a test before `find_subpos()` to reject
blob, tree objects. This will help us add %(raw) atom
which can grab raw data of four type objects.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: ZheNing Hu <adlternative@gmail.com>
---
 ref-filter.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/ref-filter.c b/ref-filter.c
index 97116e12d7c4..f6a7b5290d54 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1292,7 +1292,8 @@ static void append_lines(struct strbuf *out, const char *buf, unsigned long size
 }
 
 /* See grab_values */
-static void grab_sub_body_contents(struct atom_value *val, int deref, void *buf)
+static void grab_sub_body_contents(struct atom_value *val, int deref, void *buf,
+				   struct object *obj)
 {
 	int i;
 	const char *subpos = NULL, *bodypos = NULL, *sigpos = NULL;
@@ -1307,10 +1308,13 @@ static void grab_sub_body_contents(struct atom_value *val, int deref, void *buf)
 			continue;
 		if (deref)
 			name++;
-		if (strcmp(name, "body") &&
-		    !starts_with(name, "subject") &&
-		    !starts_with(name, "trailers") &&
-		    !starts_with(name, "contents"))
+
+		if ((obj->type != OBJ_TAG &&
+		     obj->type != OBJ_COMMIT) ||
+		    (strcmp(name, "body") &&
+		     !starts_with(name, "subject") &&
+		     !starts_with(name, "trailers") &&
+		     !starts_with(name, "contents")))
 			continue;
 		if (!subpos)
 			find_subpos(buf,
@@ -1379,12 +1383,12 @@ static void grab_values(struct atom_value *val, int deref, struct object *obj, v
 	switch (obj->type) {
 	case OBJ_TAG:
 		grab_tag_values(val, deref, obj);
-		grab_sub_body_contents(val, deref, buf);
+		grab_sub_body_contents(val, deref, buf, obj);
 		grab_person("tagger", val, deref, buf);
 		break;
 	case OBJ_COMMIT:
 		grab_commit_values(val, deref, obj);
-		grab_sub_body_contents(val, deref, buf);
+		grab_sub_body_contents(val, deref, buf, obj);
 		grab_person("author", val, deref, buf);
 		grab_person("committer", val, deref, buf);
 		break;
-- 
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