[PATCH v2 5/9] [GSOC] ref-filter: teach get_object() return useful value

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

From: ZheNing Hu <adlternative@gmail.com>

Let `populate_value()`, `get_ref_atom_value()` and
`format_ref_array_item()` get the return value of `get_object()`
correctly. This can help us later let `cat-file --batch` get the
correct error message and return value of `get_object()`.

Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Hariom Verma <hariom18599@gmail.com>
Signed-off-by: ZheNing Hu <adlternative@gmail.com>
---
 ref-filter.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/ref-filter.c b/ref-filter.c
index 8868cf98f090..420c0bf9384f 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1808,7 +1808,7 @@ static char *get_worktree_path(const struct used_atom *atom, const struct ref_ar
 static int populate_value(struct ref_array_item *ref, struct strbuf *err)
 {
 	struct object *obj;
-	int i;
+	int i, ret = 0;
 	struct object_info empty = OBJECT_INFO_INIT;
 
 	CALLOC_ARRAY(ref->value, used_atom_cnt);
@@ -1965,8 +1965,8 @@ static int populate_value(struct ref_array_item *ref, struct strbuf *err)
 
 
 	oi.oid = ref->objectname;
-	if (get_object(ref, 0, &obj, &oi, err))
-		return -1;
+	if ((ret = get_object(ref, 0, &obj, &oi, err)))
+		return ret;
 
 	/*
 	 * If there is no atom that wants to know about tagged
@@ -1997,9 +1997,11 @@ static int populate_value(struct ref_array_item *ref, struct strbuf *err)
 static int get_ref_atom_value(struct ref_array_item *ref, int atom,
 			      struct atom_value **v, struct strbuf *err)
 {
+	int ret = 0;
+
 	if (!ref->value) {
-		if (populate_value(ref, err))
-			return -1;
+		if ((ret = populate_value(ref, err)))
+			return ret;
 		fill_missing_values(ref->value);
 	}
 	*v = &ref->value[atom];
@@ -2573,6 +2575,7 @@ int format_ref_array_item(struct ref_array_item *info,
 {
 	const char *cp, *sp, *ep;
 	struct ref_formatting_state state = REF_FORMATTING_STATE_INIT;
+	int ret = 0;
 
 	state.quote_style = format->quote_style;
 	push_stack_element(&state.stack);
@@ -2585,10 +2588,10 @@ int format_ref_array_item(struct ref_array_item *info,
 		if (cp < sp)
 			append_literal(cp, sp, &state);
 		pos = parse_ref_filter_atom(format, sp + 2, ep, error_buf);
-		if (pos < 0 || get_ref_atom_value(info, pos, &atomv, error_buf) ||
+		if (pos < 0 || (ret = get_ref_atom_value(info, pos, &atomv, error_buf)) ||
 		    atomv->handler(atomv, &state, error_buf)) {
 			pop_stack_element(&state.stack);
-			return -1;
+			return ret ? ret : -1;
 		}
 	}
 	if (*cp) {
@@ -2610,7 +2613,7 @@ int format_ref_array_item(struct ref_array_item *info,
 	}
 	strbuf_addbuf(final_buf, &state.stack->output);
 	pop_stack_element(&state.stack);
-	return 0;
+	return ret;
 }
 
 void pretty_print_ref(const char *name, const struct object_id *oid,
-- 
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