[v12,09/12] ls-tree: introduce struct "show_tree_data"

Commit Message

Teng Long March 4, 2022, 10:42 a.m. UTC

From: Ævar Arnfjörð Bjarmason <[e-mail]>

"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.

At the same time, we also move global "shown_fields" into "show_tree_data"
, the purpose of this is to avoid use both global variable and pass-around
struct.

Signed-off-by: Ævar Arnfjörð Bjarmason <[e-mail]>
Signed-off-by: Teng Long <[e-mail]>
---
 builtin/ls-tree.c | 69 +++++++++++++++++++++++++++++------------------
 1 file changed, 43 insertions(+), 26 deletions(-)

Patch

diff --git a/builtin/ls-tree.c b/builtin/ls-tree.c
index c70e31ac3d..04aefc6106 100644
--- a/builtin/ls-tree.c
+++ b/builtin/ls-tree.c
@@ -25,7 +25,6 @@  static int ls_options;
 static struct pathspec pathspec;
 static int chomp_prefix;
 static const char *ls_tree_prefix;
-static unsigned int shown_fields;
 #define FIELD_PATH_NAME 1
 #define FIELD_SIZE (1 << 1)
 #define FIELD_OBJECT_NAME (1 << 2)
@@ -34,6 +33,15 @@  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;
+	unsigned int shown_fields;
+};
+
 static const  char * const ls_tree_usage[] = {
 	N_("git ls-tree [<options>] <tree-ish> [<path>...]"),
 	NULL
@@ -45,19 +53,19 @@  static enum mutx_option {
 	MODE_LONG,
 } cmdmode;
 
-static int parse_shown_fields(void)
+static int parse_shown_fields(unsigned int *shown_fields)
 {
 	if (cmdmode == MODE_NAME_ONLY) {
-		shown_fields = FIELD_PATH_NAME;
+		*shown_fields = FIELD_PATH_NAME;
 		return 0;
 	}
 
 	if (!ls_options || (ls_options & LS_RECURSIVE)
 	    || (ls_options & LS_SHOW_TREES)
 	    || (ls_options & LS_TREE_ONLY))
-		shown_fields = FIELD_DEFAULT;
+		*shown_fields = FIELD_DEFAULT;
 	if (cmdmode == MODE_LONG)
-		shown_fields = FIELD_LONG_DEFAULT;
+		*shown_fields = FIELD_LONG_DEFAULT;
 	return 1;
 }
 
@@ -91,17 +99,15 @@  static int show_recursive(const char *base, size_t baselen, const char *pathname
 	return 0;
 }
 
-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) {
+	if (data->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),
@@ -109,18 +115,18 @@  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;
 }
 
@@ -130,6 +136,15 @@  static int show_tree(const struct object_id *oid, struct strbuf *base,
 	int recurse = 0;
 	size_t baselen;
 	enum object_type type = object_type(mode);
+	unsigned int shown_fields = *(unsigned int *)context;
+	struct show_tree_data data = {
+		.mode = mode,
+		.type = type,
+		.oid = oid,
+		.pathname = pathname,
+		.base = base,
+		.shown_fields = shown_fields,
+	};
 
 	if (type == OBJ_BLOB) {
 		if (ls_options & LS_TREE_ONLY)
@@ -151,8 +166,8 @@  static int show_tree(const struct object_id *oid, struct strbuf *base,
 		return recurse;
 	}
 
-	if (shown_fields >= FIELD_DEFAULT)
-		show_default(oid, type, pathname, mode, base);
+	if (shown_fields>= FIELD_DEFAULT)
+		show_default(&data);
 
 	return recurse;
 }
@@ -162,6 +177,7 @@  int cmd_ls_tree(int argc, const char **argv, const char *prefix)
 	struct object_id oid;
 	struct tree *tree;
 	int i, full_tree = 0;
+	unsigned int shown_fields = 0;
 	const struct option ls_tree_options[] = {
 		OPT_BIT('d', NULL, &ls_options, N_("only show trees"),
 			LS_TREE_ONLY),
@@ -207,8 +223,6 @@  int cmd_ls_tree(int argc, const char **argv, const char *prefix)
 	if (get_oid(argv[0], &oid))
 		die("Not a valid object name %s", argv[0]);
 
-	parse_shown_fields();
-
 	/*
 	 * show_recursive() rolls its own matching code and is
 	 * generally ignorant of 'struct pathspec'. The magic mask
@@ -225,6 +239,9 @@  int cmd_ls_tree(int argc, const char **argv, const char *prefix)
 	tree = parse_tree_indirect(&oid);
 	if (!tree)
 		die("not a tree object");
-	return !!read_tree(the_repository, tree,
-			   &pathspec, show_tree, NULL);
+
+	parse_shown_fields(&shown_fields);
+
+	return !!read_tree(the_repository, tree, &pathspec, show_tree,
+			   &shown_fields);
 }