1 files changed, 156 insertions, 67 deletions

diff --git a/builtin/name-rev.c b/builtin/name-rev.c
index 248a3eb260..9e088ebd11 100644
--- a/builtin/name-rev.c
+++ b/builtin/name-rev.c
@@ -1,5 +1,6 @@
 #include "builtin.h"
 #include "cache.h"
+#include "config.h"
 #include "commit.h"
 #include "tag.h"
 #include "refs.h"
@@ -10,22 +11,64 @@
 
 typedef struct rev_name {
 	const char *tip_name;
+	timestamp_t taggerdate;
 	int generation;
 	int distance;
+	int from_tag;
 } rev_name;
 
-static long cutoff = LONG_MAX;
+static timestamp_t cutoff = TIME_MAX;
 
 /* How many generations are maximally preferred over _one_ merge traversal? */
 #define MERGE_TRAVERSAL_WEIGHT 65535
 
+static int is_better_name(struct rev_name *name,
+			  const char *tip_name,
+			  timestamp_t taggerdate,
+			  int generation,
+			  int distance,
+			  int from_tag)
+{
+	/*
+	 * When comparing names based on tags, prefer names
+	 * based on the older tag, even if it is farther away.
+	 */
+	if (from_tag && name->from_tag)
+		return (name->taggerdate > taggerdate ||
+			(name->taggerdate == taggerdate &&
+			 name->distance > distance));
+
+	/*
+	 * We know that at least one of them is a non-tag at this point.
+	 * favor a tag over a non-tag.
+	 */
+	if (name->from_tag != from_tag)
+		return from_tag;
+
+	/*
+	 * We are now looking at two non-tags.  Tiebreak to favor
+	 * shorter hops.
+	 */
+	if (name->distance != distance)
+		return name->distance > distance;
+
+	/* ... or tiebreak to favor older date */
+	if (name->taggerdate != taggerdate)
+		return name->taggerdate > taggerdate;
+
+	/* keep the current one if we cannot decide */
+	return 0;
+}
+
 static void name_rev(struct commit *commit,
-		const char *tip_name, int generation, int distance,
+		const char *tip_name, timestamp_t taggerdate,
+		int generation, int distance, int from_tag,
 		int deref)
 {
 	struct rev_name *name = (struct rev_name *)commit->util;
 	struct commit_list *parents;
 	int parent_number = 1;
+	char *to_free = NULL;
 
 	parse_commit(commit);
 
@@ -33,7 +76,7 @@ static void name_rev(struct commit *commit,
 		return;
 
 	if (deref) {
-		tip_name = xstrfmt("%s^0", tip_name);
+		tip_name = to_free = xstrfmt("%s^0", tip_name);
 
 		if (generation)
 			die("generation: %d, but deref?", generation);
@@ -43,38 +86,41 @@ static void name_rev(struct commit *commit,
 		name = xmalloc(sizeof(rev_name));
 		commit->util = name;
 		goto copy_data;
-	} else if (name->distance > distance) {
+	} else if (is_better_name(name, tip_name, taggerdate,
+				  generation, distance, from_tag)) {
 copy_data:
 		name->tip_name = tip_name;
+		name->taggerdate = taggerdate;
 		name->generation = generation;
 		name->distance = distance;
-	} else
+		name->from_tag = from_tag;
+	} else {
+		free(to_free);
 		return;
+	}
 
 	for (parents = commit->parents;
 			parents;
 			parents = parents->next, parent_number++) {
 		if (parent_number > 1) {
-			int len = strlen(tip_name);
-			char *new_name = xmalloc(len +
-				1 + decimal_length(generation) +  /* ~<n> */
-				1 + 2 +				  /* ^NN */
-				1);
-
-			if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
-				len -= 2;
+			size_t len;
+			char *new_name;
+
+			strip_suffix(tip_name, "^0", &len);
 			if (generation > 0)
-				sprintf(new_name, "%.*s~%d^%d", len, tip_name,
-						generation, parent_number);
+				new_name = xstrfmt("%.*s~%d^%d", (int)len, tip_name,
+						   generation, parent_number);
 			else
-				sprintf(new_name, "%.*s^%d", len, tip_name,
-						parent_number);
+				new_name = xstrfmt("%.*s^%d", (int)len, tip_name,
+						   parent_number);
 
-			name_rev(parents->item, new_name, 0,
-				distance + MERGE_TRAVERSAL_WEIGHT, 0);
+			name_rev(parents->item, new_name, taggerdate, 0,
+				 distance + MERGE_TRAVERSAL_WEIGHT,
+				 from_tag, 0);
 		} else {
-			name_rev(parents->item, tip_name, generation + 1,
-				distance + 1, 0);
+			name_rev(parents->item, tip_name, taggerdate,
+				 generation + 1, distance + 1,
+				 from_tag, 0);
 		}
 	}
 }
@@ -84,7 +130,7 @@ static int subpath_matches(const char *path, const char *filter)
 	const char *subpath = path;
 
 	while (subpath) {
-		if (!wildmatch(filter, subpath, 0, NULL))
+		if (!wildmatch(filter, subpath, 0))
 			return subpath - path;
 		subpath = strchr(subpath, '/');
 		if (subpath)
@@ -107,12 +153,13 @@ static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
 struct name_ref_data {
 	int tags_only;
 	int name_only;
-	const char *ref_filter;
+	struct string_list ref_filters;
+	struct string_list exclude_filters;
 };
 
 static struct tip_table {
 	struct tip_table_entry {
-		unsigned char sha1[20];
+		struct object_id oid;
 		const char *refname;
 	} *table;
 	int nr;
@@ -120,13 +167,13 @@ static struct tip_table {
 	int sorted;
 } tip_table;
 
-static void add_to_tip_table(const unsigned char *sha1, const char *refname,
+static void add_to_tip_table(const struct object_id *oid, const char *refname,
 			     int shorten_unambiguous)
 {
 	refname = name_ref_abbrev(refname, shorten_unambiguous);
 
 	ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
-	hashcpy(tip_table.table[tip_table.nr].sha1, sha1);
+	oidcpy(&tip_table.table[tip_table.nr].oid, oid);
 	tip_table.table[tip_table.nr].refname = xstrdup(refname);
 	tip_table.nr++;
 	tip_table.sorted = 0;
@@ -135,45 +182,82 @@ static void add_to_tip_table(const unsigned char *sha1, const char *refname,
 static int tipcmp(const void *a_, const void *b_)
 {
 	const struct tip_table_entry *a = a_, *b = b_;
-	return hashcmp(a->sha1, b->sha1);
+	return oidcmp(&a->oid, &b->oid);
 }
 
 static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data)
 {
-	struct object *o = parse_object(oid->hash);
+	struct object *o = parse_object(oid);
 	struct name_ref_data *data = cb_data;
 	int can_abbreviate_output = data->tags_only && data->name_only;
 	int deref = 0;
+	timestamp_t taggerdate = TIME_MAX;
 
 	if (data->tags_only && !starts_with(path, "refs/tags/"))
 		return 0;
 
-	if (data->ref_filter) {
-		switch (subpath_matches(path, data->ref_filter)) {
-		case -1: /* did not match */
-			return 0;
-		case 0:  /* matched fully */
-			break;
-		default: /* matched subpath */
-			can_abbreviate_output = 1;
-			break;
+	if (data->exclude_filters.nr) {
+		struct string_list_item *item;
+
+		for_each_string_list_item(item, &data->exclude_filters) {
+			if (subpath_matches(path, item->string) >= 0)
+				return 0;
+		}
+	}
+
+	if (data->ref_filters.nr) {
+		struct string_list_item *item;
+		int matched = 0;
+
+		/* See if any of the patterns match. */
+		for_each_string_list_item(item, &data->ref_filters) {
+			/*
+			 * Check all patterns even after finding a match, so
+			 * that we can see if a match with a subpath exists.
+			 * When a user asked for 'refs/tags/v*' and 'v1.*',
+			 * both of which match, the user is showing her
+			 * willingness to accept a shortened output by having
+			 * the 'v1.*' in the acceptable refnames, so we
+			 * shouldn't stop when seeing 'refs/tags/v1.4' matches
+			 * 'refs/tags/v*'.  We should show it as 'v1.4'.
+			 */
+			switch (subpath_matches(path, item->string)) {
+			case -1: /* did not match */
+				break;
+			case 0: /* matched fully */
+				matched = 1;
+				break;
+			default: /* matched subpath */
+				matched = 1;
+				can_abbreviate_output = 1;
+				break;
+			}
 		}
+
+		/* If none of the patterns matched, stop now */
+		if (!matched)
+			return 0;
 	}
 
-	add_to_tip_table(oid->hash, path, can_abbreviate_output);
+	add_to_tip_table(oid, path, can_abbreviate_output);
 
 	while (o && o->type == OBJ_TAG) {
 		struct tag *t = (struct tag *) o;
 		if (!t->tagged)
 			break; /* broken repository */
-		o = parse_object(t->tagged->sha1);
+		o = parse_object(&t->tagged->oid);
 		deref = 1;
+		taggerdate = t->date;
 	}
 	if (o && o->type == OBJ_COMMIT) {
 		struct commit *commit = (struct commit *)o;
+		int from_tag = starts_with(path, "refs/tags/");
 
+		if (taggerdate == TIME_MAX)
+			taggerdate = ((struct commit *)o)->date;
 		path = name_ref_abbrev(path, can_abbreviate_output);
-		name_rev(commit, xstrdup(path), 0, 0, deref);
+		name_rev(commit, xstrdup(path), taggerdate, 0, 0,
+			 from_tag, deref);
 	}
 	return 0;
 }
@@ -181,7 +265,7 @@ static int name_ref(const char *path, const struct object_id *oid, int flags, vo
 static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
 {
 	struct tip_table_entry *table = table_;
-	return table[ix].sha1;
+	return table[ix].oid.hash;
 }
 
 static const char *get_exact_ref_match(const struct object *o)
@@ -192,22 +276,20 @@ static const char *get_exact_ref_match(const struct object *o)
 		return NULL;
 
 	if (!tip_table.sorted) {
-		qsort(tip_table.table, tip_table.nr, sizeof(*tip_table.table),
-		      tipcmp);
+		QSORT(tip_table.table, tip_table.nr, tipcmp);
 		tip_table.sorted = 1;
 	}
 
-	found = sha1_pos(o->sha1, tip_table.table, tip_table.nr,
+	found = sha1_pos(o->oid.hash, tip_table.table, tip_table.nr,
 			 nth_tip_table_ent);
 	if (0 <= found)
 		return tip_table.table[found].refname;
 	return NULL;
 }
 
-/* returns a static buffer */
-static const char *get_rev_name(const struct object *o)
+/* may return a constant string or use "buf" as scratch space */
+static const char *get_rev_name(const struct object *o, struct strbuf *buf)
 {
-	static char buffer[1024];
 	struct rev_name *n;
 	struct commit *c;
 
@@ -224,10 +306,9 @@ static const char *get_rev_name(const struct object *o)
 		int len = strlen(n->tip_name);
 		if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 			len -= 2;
-		snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
-				n->generation);
-
-		return buffer;
+		strbuf_reset(buf);
+		strbuf_addf(buf, "%.*s~%d", len, n->tip_name, n->generation);
+		return buf->buf;
 	}
 }
 
@@ -236,19 +317,21 @@ static void show_name(const struct object *obj,
 		      int always, int allow_undefined, int name_only)
 {
 	const char *name;
-	const unsigned char *sha1 = obj->sha1;
+	const struct object_id *oid = &obj->oid;
+	struct strbuf buf = STRBUF_INIT;
 
 	if (!name_only)
-		printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
-	name = get_rev_name(obj);
+		printf("%s ", caller_name ? caller_name : oid_to_hex(oid));
+	name = get_rev_name(obj, &buf);
 	if (name)
 		printf("%s\n", name);
 	else if (allow_undefined)
 		printf("undefined\n");
 	else if (always)
-		printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
+		printf("%s\n", find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
 	else
-		die("cannot describe '%s'", sha1_to_hex(sha1));
+		die("cannot describe '%s'", oid_to_hex(oid));
+	strbuf_release(&buf);
 }
 
 static char const * const name_rev_usage[] = {
@@ -260,15 +343,16 @@ static char const * const name_rev_usage[] = {
 
 static void name_rev_line(char *p, struct name_ref_data *data)
 {
+	struct strbuf buf = STRBUF_INIT;
 	int forty = 0;
 	char *p_start;
 	for (p_start = p; *p; p++) {
 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 		if (!ishex(*p))
 			forty = 0;
-		else if (++forty == 40 &&
+		else if (++forty == GIT_SHA1_HEXSZ &&
 			 !ishex(*(p+1))) {
-			unsigned char sha1[40];
+			struct object_id oid;
 			const char *name = NULL;
 			char c = *(p+1);
 			int p_len = p - p_start + 1;
@@ -276,11 +360,11 @@ static void name_rev_line(char *p, struct name_ref_data *data)
 			forty = 0;
 
 			*(p+1) = 0;
-			if (!get_sha1(p - 39, sha1)) {
+			if (!get_oid(p - (GIT_SHA1_HEXSZ - 1), &oid)) {
 				struct object *o =
-					lookup_object(sha1);
+					lookup_object(oid.hash);
 				if (o)
-					name = get_rev_name(o);
+					name = get_rev_name(o, &buf);
 			}
 			*(p+1) = c;
 
@@ -288,7 +372,7 @@ static void name_rev_line(char *p, struct name_ref_data *data)
 				continue;
 
 			if (data->name_only)
-				printf("%.*s%s", p_len - 40, p_start, name);
+				printf("%.*s%s", p_len - GIT_SHA1_HEXSZ, p_start, name);
 			else
 				printf("%.*s (%s)", p_len, p_start, name);
 			p_start = p + 1;
@@ -298,18 +382,22 @@ static void name_rev_line(char *p, struct name_ref_data *data)
 	/* flush */
 	if (p_start != p)
 		fwrite(p_start, p - p_start, 1, stdout);
+
+	strbuf_release(&buf);
 }
 
 int cmd_name_rev(int argc, const char **argv, const char *prefix)
 {
 	struct object_array revs = OBJECT_ARRAY_INIT;
 	int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0;
-	struct name_ref_data data = { 0, 0, NULL };
+	struct name_ref_data data = { 0, 0, STRING_LIST_INIT_NODUP, STRING_LIST_INIT_NODUP };
 	struct option opts[] = {
 		OPT_BOOL(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
 		OPT_BOOL(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
-		OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
+		OPT_STRING_LIST(0, "refs", &data.ref_filters, N_("pattern"),
 				   N_("only use refs matching <pattern>")),
+		OPT_STRING_LIST(0, "exclude", &data.exclude_filters, N_("pattern"),
+				   N_("ignore refs matching <pattern>")),
 		OPT_GROUP(""),
 		OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
 		OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")),
@@ -335,18 +423,18 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
 		cutoff = 0;
 
 	for (; argc; argc--, argv++) {
-		unsigned char sha1[20];
+		struct object_id oid;
 		struct object *object;
 		struct commit *commit;
 
-		if (get_sha1(*argv, sha1)) {
+		if (get_oid(*argv, &oid)) {
 			fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 					*argv);
 			continue;
 		}
 
 		commit = NULL;
-		object = parse_object(sha1);
+		object = parse_object(&oid);
 		if (object) {
 			struct object *peeled = deref_tag(object, *argv, 0);
 			if (peeled && peeled->type == OBJ_COMMIT)
@@ -406,5 +494,6 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
 				  always, allow_undefined, data.name_only);
 	}
 
+	UNLEAK(revs);
 	return 0;
 }