ls-tree: don't use "show_tree_data" for "fast" callbacks

As noted in [1] the code that made it in as part of
9c4d58f (ls-tree: split up "fast path" callbacks, 2022-03-23) was
a "maybe a good idea, maybe not" RFC-quality patch. I hadn't looked
very carefully at the resulting patterns.

The implementation shared the "struct show_tree_data data", which was
introduced in e815171 (ls-tree: introduce struct "show_tree_data",
2022-03-23) both for use in 455923e (ls-tree: introduce "--format"
option, 2022-03-23), and because the "fat" callback hadn't been split
up as 9c4d58f did.

Now that that's been done we can see that most of what
show_tree_common() was doing could be done lazily by the callbacks
themselves, who in the pre-image were often using an odd mis-match of
their own arguments and those same arguments stuck into the "data"
structure. Let's also have the callers initialize the "type", rather
than grabbing it from the "data" structure afterwards.

1. https://lore.kernel.org/git/[email protected]/

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Teng Long <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

builtin/ls-tree.c

@@ -173,19 +173,11 @@ static int show_tree_fmt(const struct object_id *oid, struct strbuf *base,
 	return recurse;
 }
 
-static int show_tree_common(struct show_tree_data *data, int *recurse,
-			    const struct object_id *oid, struct strbuf *base,
-			    const char *pathname, unsigned mode)
+static int show_tree_common(int *recurse, struct strbuf *base,
+			    const char *pathname, enum object_type type)
 {
-	enum object_type type = object_type(mode);
 	int ret = -1;
-
 	*recurse = 0;
-	data->mode = mode;
-	data->type = type;
-	data->oid = oid;
-	data->pathname = pathname;
-	data->base = base;
 
 	if (type == OBJ_BLOB) {
 		if (ls_options & LS_TREE_ONLY)
@@ -217,15 +209,15 @@ static int show_tree_default(const struct object_id *oid, struct strbuf *base,
 {
 	int early;
 	int recurse;
-	struct show_tree_data data = { 0 };
+	enum object_type type = object_type(mode);
 
-	early = show_tree_common(&data, &recurse, oid, base, pathname, mode);
+	early = show_tree_common(&recurse, base, pathname, type);
 	if (early >= 0)
 		return early;
 
-	printf("%06o %s %s\t", data.mode, type_name(data.type),
-	       find_unique_abbrev(data.oid, abbrev));
-	show_tree_common_default_long(base, pathname, data.base->len);
+	printf("%06o %s %s\t", mode, type_name(object_type(mode)),
+	       find_unique_abbrev(oid, abbrev));
+	show_tree_common_default_long(base, pathname, base->len);
 	return recurse;
 }
 
@@ -235,16 +227,16 @@ static int show_tree_long(const struct object_id *oid, struct strbuf *base,
 {
 	int early;
 	int recurse;
-	struct show_tree_data data = { 0 };
 	char size_text[24];
+	enum object_type type = object_type(mode);
 
-	early = show_tree_common(&data, &recurse, oid, base, pathname, mode);
+	early = show_tree_common(&recurse, base, pathname, type);
 	if (early >= 0)
 		return early;
 
-	if (data.type == OBJ_BLOB) {
+	if (type == OBJ_BLOB) {
 		unsigned long size;
-		if (oid_object_info(the_repository, data.oid, &size) == OBJ_BAD)
+		if (oid_object_info(the_repository, oid, &size) == OBJ_BAD)
 			xsnprintf(size_text, sizeof(size_text), "BAD");
 		else
 			xsnprintf(size_text, sizeof(size_text),
@@ -253,9 +245,9 @@ static int show_tree_long(const struct object_id *oid, struct strbuf *base,
 		xsnprintf(size_text, sizeof(size_text), "-");
 	}
 
-	printf("%06o %s %s %7s\t", data.mode, type_name(data.type),
-	       find_unique_abbrev(data.oid, abbrev), size_text);
-	show_tree_common_default_long(base, pathname, data.base->len);
+	printf("%06o %s %s %7s\t", mode, type_name(type),
+	       find_unique_abbrev(oid, abbrev), size_text);
+	show_tree_common_default_long(base, pathname, base->len);
 	return recurse;
 }
 
@@ -266,9 +258,9 @@ static int show_tree_name_only(const struct object_id *oid, struct strbuf *base,
 	int early;
 	int recurse;
 	const size_t baselen = base->len;
-	struct show_tree_data data = { 0 };
+	enum object_type type = object_type(mode);
 
-	early = show_tree_common(&data, &recurse, oid, base, pathname, mode);
+	early = show_tree_common(&recurse, base, pathname, type);
 	if (early >= 0)
 		return early;
 
@@ -286,9 +278,9 @@ static int show_tree_object(const struct object_id *oid, struct strbuf *base,
 {
 	int early;
 	int recurse;
-	struct show_tree_data data = { 0 };
+	enum object_type type = object_type(mode);
 
-	early = show_tree_common(&data, &recurse, oid, base, pathname, mode);
+	early = show_tree_common(&recurse, base, pathname, type);
 	if (early >= 0)
 		return early;