1 files changed, 192 insertions, 33 deletions

diff --git a/builtin/tag.c b/builtin/tag.c
index ea55f1d..e633f4e 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -27,9 +27,18 @@ static const char * const git_tag_usage[] = {
 	NULL
 };
 
+#define STRCMP_SORT     0	/* must be zero */
+#define VERCMP_SORT     1
+#define SORT_MASK       0x7fff
+#define REVERSE_SORT    0x8000
+
+static int tag_sort;
+
 struct tag_filter {
 	const char **patterns;
 	int lines;
+	int sort;
+	struct string_list tags;
 	struct commit_list *with_commit;
 };
 
@@ -42,7 +51,7 @@ static int match_pattern(const char **patterns, const char *ref)
 	if (!*patterns)
 		return 1;
 	for (; *patterns; patterns++)
-		if (!fnmatch(*patterns, ref, 0))
+		if (!wildmatch(*patterns, ref, 0, NULL))
 			return 1;
 	return 0;
 }
@@ -73,11 +82,19 @@ static int in_commit_list(const struct commit_list *want, struct commit *c)
 	return 0;
 }
 
-static int contains_recurse(struct commit *candidate,
+enum contains_result {
+	CONTAINS_UNKNOWN = -1,
+	CONTAINS_NO = 0,
+	CONTAINS_YES = 1
+};
+
+/*
+ * Test whether the candidate or one of its parents is contained in the list.
+ * Do not recurse to find out, though, but return -1 if inconclusive.
+ */
+static enum contains_result contains_test(struct commit *candidate,
 			    const struct commit_list *want)
 {
-	struct commit_list *p;
-
 	/* was it previously marked as containing a want commit? */
 	if (candidate->object.flags & TMP_MARK)
 		return 1;
@@ -85,26 +102,78 @@ static int contains_recurse(struct commit *candidate,
 	if (candidate->object.flags & UNINTERESTING)
 		return 0;
 	/* or are we it? */
-	if (in_commit_list(want, candidate))
+	if (in_commit_list(want, candidate)) {
+		candidate->object.flags |= TMP_MARK;
 		return 1;
+	}
 
 	if (parse_commit(candidate) < 0)
 		return 0;
 
-	/* Otherwise recurse and mark ourselves for future traversals. */
-	for (p = candidate->parents; p; p = p->next) {
-		if (contains_recurse(p->item, want)) {
-			candidate->object.flags |= TMP_MARK;
-			return 1;
-		}
-	}
-	candidate->object.flags |= UNINTERESTING;
-	return 0;
+	return -1;
+}
+
+/*
+ * Mimicking the real stack, this stack lives on the heap, avoiding stack
+ * overflows.
+ *
+ * At each recursion step, the stack items points to the commits whose
+ * ancestors are to be inspected.
+ */
+struct stack {
+	int nr, alloc;
+	struct stack_entry {
+		struct commit *commit;
+		struct commit_list *parents;
+	} *stack;
+};
+
+static void push_to_stack(struct commit *candidate, struct stack *stack)
+{
+	int index = stack->nr++;
+	ALLOC_GROW(stack->stack, stack->nr, stack->alloc);
+	stack->stack[index].commit = candidate;
+	stack->stack[index].parents = candidate->parents;
 }
 
-static int contains(struct commit *candidate, const struct commit_list *want)
+static enum contains_result contains(struct commit *candidate,
+		const struct commit_list *want)
 {
-	return contains_recurse(candidate, want);
+	struct stack stack = { 0, 0, NULL };
+	int result = contains_test(candidate, want);
+
+	if (result != CONTAINS_UNKNOWN)
+		return result;
+
+	push_to_stack(candidate, &stack);
+	while (stack.nr) {
+		struct stack_entry *entry = &stack.stack[stack.nr - 1];
+		struct commit *commit = entry->commit;
+		struct commit_list *parents = entry->parents;
+
+		if (!parents) {
+			commit->object.flags |= UNINTERESTING;
+			stack.nr--;
+		}
+		/*
+		 * If we just popped the stack, parents->item has been marked,
+		 * therefore contains_test will return a meaningful 0 or 1.
+		 */
+		else switch (contains_test(parents->item, want)) {
+		case CONTAINS_YES:
+			commit->object.flags |= TMP_MARK;
+			stack.nr--;
+			break;
+		case CONTAINS_NO:
+			entry->parents = parents->next;
+			break;
+		case CONTAINS_UNKNOWN:
+			push_to_stack(parents->item, &stack);
+			break;
+		}
+	}
+	free(stack.stack);
+	return contains_test(candidate, want);
 }
 
 static void show_tag_lines(const unsigned char *sha1, int lines)
@@ -166,7 +235,10 @@ static int show_reference(const char *refname, const unsigned char *sha1,
 			return 0;
 
 		if (!filter->lines) {
-			printf("%s\n", refname);
+			if (filter->sort)
+				string_list_append(&filter->tags, refname);
+			else
+				printf("%s\n", refname);
 			return 0;
 		}
 		printf("%-15s ", refname);
@@ -177,17 +249,39 @@ static int show_reference(const char *refname, const unsigned char *sha1,
 	return 0;
 }
 
+static int sort_by_version(const void *a_, const void *b_)
+{
+	const struct string_list_item *a = a_;
+	const struct string_list_item *b = b_;
+	return versioncmp(a->string, b->string);
+}
+
 static int list_tags(const char **patterns, int lines,
-			struct commit_list *with_commit)
+		     struct commit_list *with_commit, int sort)
 {
 	struct tag_filter filter;
 
 	filter.patterns = patterns;
 	filter.lines = lines;
+	filter.sort = sort;
 	filter.with_commit = with_commit;
+	memset(&filter.tags, 0, sizeof(filter.tags));
+	filter.tags.strdup_strings = 1;
 
 	for_each_tag_ref(show_reference, (void *) &filter);
-
+	if (sort) {
+		int i;
+		if ((sort & SORT_MASK) == VERCMP_SORT)
+			qsort(filter.tags.items, filter.tags.nr,
+			      sizeof(struct string_list_item), sort_by_version);
+		if (sort & REVERSE_SORT)
+			for (i = filter.tags.nr - 1; i >= 0; i--)
+				printf("%s\n", filter.tags.items[i].string);
+		else
+			for (i = 0; i < filter.tags.nr; i++)
+				printf("%s\n", filter.tags.items[i].string);
+		string_list_clear(&filter.tags, 0);
+	}
 	return 0;
 }
 
@@ -246,20 +340,62 @@ static int do_sign(struct strbuf *buffer)
 }
 
 static const char tag_template[] =
-	N_("\nWrite a tag message\n"
+	N_("\nWrite a message for tag:\n  %s\n"
 	"Lines starting with '%c' will be ignored.\n");
 
 static const char tag_template_nocleanup[] =
-	N_("\nWrite a tag message\n"
+	N_("\nWrite a message for tag:\n  %s\n"
 	"Lines starting with '%c' will be kept; you may remove them"
 	" yourself if you want to.\n");
 
+/*
+ * Parse a sort string, and return 0 if parsed successfully. Will return
+ * non-zero when the sort string does not parse into a known type. If var is
+ * given, the error message becomes a warning and includes information about
+ * the configuration value.
+ */
+static int parse_sort_string(const char *var, const char *arg, int *sort)
+{
+	int type = 0, flags = 0;
+
+	if (skip_prefix(arg, "-", &arg))
+		flags |= REVERSE_SORT;
+
+	if (skip_prefix(arg, "version:", &arg) || skip_prefix(arg, "v:", &arg))
+		type = VERCMP_SORT;
+	else
+		type = STRCMP_SORT;
+
+	if (strcmp(arg, "refname")) {
+		if (!var)
+			return error(_("unsupported sort specification '%s'"), arg);
+		else {
+			warning(_("unsupported sort specification '%s' in variable '%s'"),
+				var, arg);
+			return -1;
+		}
+	}
+
+	*sort = (type | flags);
+
+	return 0;
+}
+
 static int git_tag_config(const char *var, const char *value, void *cb)
 {
-	int status = git_gpg_config(var, value, cb);
+	int status;
+
+	if (!strcmp(var, "tag.sort")) {
+		if (!value)
+			return config_error_nonbool(var);
+		parse_sort_string(var, value, &tag_sort);
+		return 0;
+	}
+
+	status = git_gpg_config(var, value, cb);
 	if (status)
 		return status;
-	if (!prefixcmp(var, "column."))
+	if (starts_with(var, "column."))
 		return git_column_config(var, value, "tag", &colopts);
 	return git_default_config(var, value, cb);
 }
@@ -346,9 +482,9 @@ static void create_tag(const unsigned char *object, const char *tag,
 			struct strbuf buf = STRBUF_INIT;
 			strbuf_addch(&buf, '\n');
 			if (opt->cleanup_mode == CLEANUP_ALL)
-				strbuf_commented_addf(&buf, _(tag_template), comment_line_char);
+				strbuf_commented_addf(&buf, _(tag_template), tag, comment_line_char);
 			else
-				strbuf_commented_addf(&buf, _(tag_template_nocleanup), comment_line_char);
+				strbuf_commented_addf(&buf, _(tag_template_nocleanup), tag, comment_line_char);
 			write_or_die(fd, buf.buf, buf.len);
 			strbuf_release(&buf);
 		}
@@ -427,13 +563,19 @@ static int parse_opt_points_at(const struct option *opt __attribute__((unused)),
 	return 0;
 }
 
+static int parse_opt_sort(const struct option *opt, const char *arg, int unset)
+{
+	int *sort = opt->value;
+
+	return parse_sort_string(NULL, arg, sort);
+}
+
 int cmd_tag(int argc, const char **argv, const char *prefix)
 {
 	struct strbuf buf = STRBUF_INIT;
 	struct strbuf ref = STRBUF_INIT;
 	unsigned char object[20], prev[20];
 	const char *object_ref, *tag;
-	struct ref_lock *lock;
 	struct create_tag_options opt;
 	char *cleanup_arg = NULL;
 	int annotate = 0, force = 0, lines = -1;
@@ -441,6 +583,8 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 	const char *msgfile = NULL, *keyid = NULL;
 	struct msg_arg msg = { 0, STRBUF_INIT };
 	struct commit_list *with_commit = NULL;
+	struct ref_transaction *transaction;
+	struct strbuf err = STRBUF_INIT;
 	struct option options[] = {
 		OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
 		{ OPTION_INTEGER, 'n', NULL, &lines, N_("n"),
@@ -458,10 +602,14 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 		OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 		OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
 			N_("how to strip spaces and #comments from message")),
-		OPT_STRING('u', "local-user", &keyid, N_("key id"),
+		OPT_STRING('u', "local-user", &keyid, N_("key-id"),
 					N_("use another key to sign the tag")),
 		OPT__FORCE(&force, N_("replace the tag if exists")),
 		OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
+		{
+			OPTION_CALLBACK, 0, "sort", &tag_sort, N_("type"), N_("sort tags"),
+			PARSE_OPT_NONEG, parse_opt_sort
+		},
 
 		OPT_GROUP(N_("Tag listing options")),
 		{
@@ -471,6 +619,12 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 			parse_opt_with_commit, (intptr_t)"HEAD",
 		},
 		{
+			OPTION_CALLBACK, 0, "with", &with_commit, N_("commit"),
+			N_("print only tags that contain the commit"),
+			PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
+			parse_opt_with_commit, (intptr_t)"HEAD",
+		},
+		{
 			OPTION_CALLBACK, 0, "points-at", NULL, N_("object"),
 			N_("print only tags of the object"), 0, parse_opt_points_at
 		},
@@ -509,7 +663,9 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 			copts.padding = 2;
 			run_column_filter(colopts, &copts);
 		}
-		ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit);
+		if (lines != -1 && tag_sort)
+			die(_("--sort and -n are incompatible"));
+		ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit, tag_sort);
 		if (column_active(colopts))
 			stop_column_filter();
 		return ret;
@@ -574,14 +730,17 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 	if (annotate)
 		create_tag(object, tag, &buf, &opt, prev, object);
 
-	lock = lock_any_ref_for_update(ref.buf, prev, 0, NULL);
-	if (!lock)
-		die(_("%s: cannot lock the ref"), ref.buf);
-	if (write_ref_sha1(lock, object, NULL) < 0)
-		die(_("%s: cannot update the ref"), ref.buf);
+	transaction = ref_transaction_begin(&err);
+	if (!transaction ||
+	    ref_transaction_update(transaction, ref.buf, object, prev,
+				   0, 1, NULL, &err) ||
+	    ref_transaction_commit(transaction, &err))
+		die("%s", err.buf);
+	ref_transaction_free(transaction);
 	if (force && !is_null_sha1(prev) && hashcmp(prev, object))
 		printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 
+	strbuf_release(&err);
 	strbuf_release(&buf);
 	strbuf_release(&ref);
 	return 0;