[PATCH v10 7/9] ls-tree.c: introduce struct "show_tree_data"

[Teng Long <dyroneteng@xxxxxxxxx>]

"show_tree_data" is a struct that packages the necessary fields for
"show_tree()". This commit is a pre-prepared commit for supporting
"--format" option and it does not affect any existing functionality.

Signed-off-by: Teng Long <dyroneteng@xxxxxxxxx>
---
 builtin/ls-tree.c | 44 +++++++++++++++++++++++++++++---------------
 1 file changed, 29 insertions(+), 15 deletions(-)

diff --git a/builtin/ls-tree.c b/builtin/ls-tree.c
index e1a2f8225b..56cc166adb 100644
--- a/builtin/ls-tree.c
+++ b/builtin/ls-tree.c
@@ -35,6 +35,14 @@ static unsigned int shown_fields;
 #define FIELD_DEFAULT 29 /* 11101 size is not shown to output by default */
 #define FIELD_LONG_DEFAULT  (FIELD_DEFAULT | FIELD_SIZE)
 
+struct show_tree_data {
+	unsigned mode;
+	enum object_type type;
+	const struct object_id *oid;
+	const char *pathname;
+	struct strbuf *base;
+};
+
 static const  char * const ls_tree_usage[] = {
 	N_("git ls-tree [<options>] <tree-ish> [<path>...]"),
 	NULL
@@ -108,17 +116,15 @@ static enum object_type get_type(unsigned int mode)
 	        : OBJ_BLOB);
 }
 
-static int show_default(const struct object_id *oid, enum object_type type,
-			const char *pathname, unsigned mode,
-			struct strbuf *base)
+static int show_default(struct show_tree_data *data)
 {
-	size_t baselen = base->len;
+	size_t baselen = data->base->len;
 
 	if (shown_fields & FIELD_SIZE) {
 		char size_text[24];
-		if (type == OBJ_BLOB) {
+		if (data->type == OBJ_BLOB) {
 			unsigned long size;
-			if (oid_object_info(the_repository, oid, &size) == OBJ_BAD)
+			if (oid_object_info(the_repository, data->oid, &size) == OBJ_BAD)
 				xsnprintf(size_text, sizeof(size_text), "BAD");
 			else
 				xsnprintf(size_text, sizeof(size_text),
@@ -126,18 +132,18 @@ static int show_default(const struct object_id *oid, enum object_type type,
 		} else {
 			xsnprintf(size_text, sizeof(size_text), "-");
 		}
-		printf("%06o %s %s %7s\t", mode, type_name(type),
-		find_unique_abbrev(oid, abbrev), size_text);
+		printf("%06o %s %s %7s\t", data->mode, type_name(data->type),
+		find_unique_abbrev(data->oid, abbrev), size_text);
 	} else {
-		printf("%06o %s %s\t", mode, type_name(type),
-		find_unique_abbrev(oid, abbrev));
+		printf("%06o %s %s\t", data->mode, type_name(data->type),
+		find_unique_abbrev(data->oid, abbrev));
 	}
-	baselen = base->len;
-	strbuf_addstr(base, pathname);
-	write_name_quoted_relative(base->buf,
+	baselen = data->base->len;
+	strbuf_addstr(data->base, data->pathname);
+	write_name_quoted_relative(data->base->buf,
 				   chomp_prefix ? ls_tree_prefix : NULL, stdout,
 				   line_termination);
-	strbuf_setlen(base, baselen);
+	strbuf_setlen(data->base, baselen);
 	return 1;
 }
 
@@ -148,6 +154,14 @@ static int show_tree(const struct object_id *oid, struct strbuf *base,
 	size_t baselen;
 	enum object_type type = get_type(mode);
 
+	struct show_tree_data data = {
+		.mode = mode,
+		.type = type,
+		.oid = oid,
+		.pathname = pathname,
+		.base = base,
+	};
+
 	if (type == OBJ_TREE && show_recursive(base->buf, base->len, pathname))
 		recurse = READ_TREE_RECURSIVE;
 	if (type == OBJ_TREE && recurse && !(ls_options & LS_SHOW_TREES))
@@ -171,7 +185,7 @@ static int show_tree(const struct object_id *oid, struct strbuf *base,
 	}
 
 	if (shown_fields >= FIELD_DEFAULT)
-		show_default(oid, type, pathname, mode, base);
+		show_default(&data);
 
 	return recurse;
 }
-- 
2.34.1.390.g2ae0a9cb82.dirty