X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=sha1_name.c;h=2d727d54dc43c23cb2fe19369d58e57e2a020ca9;hb=5701115aa7cfe7edd57c2483085456a37e27a5ba;hp=6d7cd78381414aa2fef31d31d46fbb24b0aaab1d;hpb=24ad8e0ce23d08d28a5d664ab6164b10125146ce;p=git.git

diff --git a/sha1_name.c b/sha1_name.c
index 6d7cd7838..2d727d54d 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -71,19 +71,22 @@ static int match_sha(unsigned len, const unsigned char *a, const unsigned char *
 static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
 {
 	struct packed_git *p;
-	unsigned char found_sha1[20];
+	const unsigned char *found_sha1 = NULL;
 	int found = 0;
 
 	prepare_packed_git();
 	for (p = packed_git; p && found < 2; p = p->next) {
-		unsigned num = num_packed_objects(p);
-		unsigned first = 0, last = num;
+		uint32_t num, last;
+		uint32_t first = 0;
+		open_pack_index(p);
+		num = p->num_objects;
+		last = num;
 		while (first < last) {
-			unsigned mid = (first + last) / 2;
-			unsigned char now[20];
+			uint32_t mid = (first + last) / 2;
+			const unsigned char *now;
 			int cmp;
 
-			nth_packed_object_sha1(p, mid, now);
+			now = nth_packed_object_sha1(p, mid);
 			cmp = hashcmp(match, now);
 			if (!cmp) {
 				first = mid;
@@ -96,14 +99,14 @@ static int find_short_packed_object(int len, const unsigned char *match, unsigne
 			last = mid;
 		}
 		if (first < num) {
-			unsigned char now[20], next[20];
-			nth_packed_object_sha1(p, first, now);
+			const unsigned char *now, *next;
+		       now = nth_packed_object_sha1(p, first);
 			if (match_sha(len, match, now)) {
-				if (nth_packed_object_sha1(p, first+1, next) ||
-				    !match_sha(len, match, next)) {
+				next = nth_packed_object_sha1(p, first+1);
+			       if (!next|| !match_sha(len, match, next)) {
 					/* unique within this pack */
 					if (!found) {
-						hashcpy(found_sha1, now);
+						found_sha1 = now;
 						found++;
 					}
 					else if (hashcmp(found_sha1, now)) {
@@ -133,6 +136,7 @@ static int find_unique_short_object(int len, char *canonical,
 	int has_unpacked, has_packed;
 	unsigned char unpacked_sha1[20], packed_sha1[20];
 
+	prepare_alt_odb();
 	has_unpacked = find_short_object_filename(len, canonical, unpacked_sha1);
 	has_packed = find_short_packed_object(len, res, packed_sha1);
 	if (!has_unpacked && !has_packed)
@@ -235,24 +239,79 @@ static int ambiguous_path(const char *path, int len)
 	return slash;
 }
 
+static const char *ref_fmt[] = {
+	"%.*s",
+	"refs/%.*s",
+	"refs/tags/%.*s",
+	"refs/heads/%.*s",
+	"refs/remotes/%.*s",
+	"refs/remotes/%.*s/HEAD",
+	NULL
+};
+
+int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
+{
+	const char **p, *r;
+	int refs_found = 0;
+
+	*ref = NULL;
+	for (p = ref_fmt; *p; p++) {
+		unsigned char sha1_from_ref[20];
+		unsigned char *this_result;
+
+		this_result = refs_found ? sha1_from_ref : sha1;
+		r = resolve_ref(mkpath(*p, len, str), this_result, 1, NULL);
+		if (r) {
+			if (!refs_found++)
+				*ref = xstrdup(r);
+			if (!warn_ambiguous_refs)
+				break;
+		}
+	}
+	return refs_found;
+}
+
+int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
+{
+	const char **p;
+	int logs_found = 0;
+
+	*log = NULL;
+	for (p = ref_fmt; *p; p++) {
+		struct stat st;
+		unsigned char hash[20];
+		char path[PATH_MAX];
+		const char *ref, *it;
+
+		strcpy(path, mkpath(*p, len, str));
+		ref = resolve_ref(path, hash, 0, NULL);
+		if (!ref)
+			continue;
+		if (!stat(git_path("logs/%s", path), &st) &&
+		    S_ISREG(st.st_mode))
+			it = path;
+		else if (strcmp(ref, path) &&
+			 !stat(git_path("logs/%s", ref), &st) &&
+			 S_ISREG(st.st_mode))
+			it = ref;
+		else
+			continue;
+		if (!logs_found++) {
+			*log = xstrdup(it);
+			hashcpy(sha1, hash);
+		}
+		if (!warn_ambiguous_refs)
+			break;
+	}
+	return logs_found;
+}
+
 static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 {
-	static const char *fmt[] = {
-		"%.*s",
-		"refs/%.*s",
-		"refs/tags/%.*s",
-		"refs/heads/%.*s",
-		"refs/remotes/%.*s",
-		"refs/remotes/%.*s/HEAD",
-		NULL
-	};
 	static const char *warning = "warning: refname '%.*s' is ambiguous.\n";
-	const char **p, *ref;
 	char *real_ref = NULL;
 	int refs_found = 0;
 	int at, reflog_len;
-	unsigned char *this_result;
-	unsigned char sha1_from_ref[20];
 
 	if (len == 40 && !get_sha1_hex(str, sha1))
 		return 0;
@@ -260,7 +319,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 	/* basic@{time or number} format to query ref-log */
 	reflog_len = at = 0;
 	if (str[len-1] == '}') {
-		for (at = 1; at < len - 1; at++) {
+		for (at = 0; at < len - 1; at++) {
 			if (str[at] == '@' && str[at+1] == '{') {
 				reflog_len = (len-1) - (at+2);
 				len = at;
@@ -270,19 +329,16 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 	}
 
 	/* Accept only unambiguous ref paths. */
-	if (ambiguous_path(str, len))
+	if (len && ambiguous_path(str, len))
 		return -1;
 
-	for (p = fmt; *p; p++) {
-		this_result = refs_found ? sha1_from_ref : sha1;
-		ref = resolve_ref(mkpath(*p, len, str), this_result, 1, NULL);
-		if (ref) {
-			if (!refs_found++)
-				real_ref = xstrdup(ref);
-			if (!warn_ambiguous_refs)
-				break;
-		}
-	}
+	if (!len && reflog_len) {
+		/* allow "@{...}" to mean the current branch reflog */
+		refs_found = dwim_ref("HEAD", 4, sha1, &real_ref);
+	} else if (reflog_len)
+		refs_found = dwim_log(str, len, sha1, &real_ref);
+	else
+		refs_found = dwim_ref(str, len, sha1, &real_ref);
 
 	if (!refs_found)
 		return -1;
@@ -291,9 +347,12 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 		fprintf(stderr, warning, len, str);
 
 	if (reflog_len) {
-		/* Is it asking for N-th entry, or approxidate? */
 		int nth, i;
 		unsigned long at_time;
+		unsigned long co_time;
+		int co_tz, co_cnt;
+
+		/* Is it asking for N-th entry, or approxidate? */
 		for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
 			char ch = str[at+2+i];
 			if ('0' <= ch && ch <= '9')
@@ -305,7 +364,18 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 			at_time = 0;
 		else
 			at_time = approxidate(str + at + 2);
-		read_ref_at(real_ref, at_time, nth, sha1);
+		if (read_ref_at(real_ref, at_time, nth, sha1, NULL,
+				&co_time, &co_tz, &co_cnt)) {
+			if (at_time)
+				fprintf(stderr,
+					"warning: Log for '%.*s' only goes "
+					"back to %s.\n", len, str,
+					show_date(co_time, co_tz, DATE_RFC2822));
+			else
+				fprintf(stderr,
+					"warning: Log for '%.*s' only has "
+					"%d entries.\n", len, str, co_cnt);
+		}
 	}
 
 	free(real_ref);
@@ -511,18 +581,83 @@ static int get_sha1_1(const char *name, int len, unsigned char *sha1)
 	return get_short_sha1(name, len, sha1, 0);
 }
 
+static int handle_one_ref(const char *path,
+		const unsigned char *sha1, int flag, void *cb_data)
+{
+	struct commit_list **list = cb_data;
+	struct object *object = parse_object(sha1);
+	if (!object)
+		return 0;
+	if (object->type == OBJ_TAG)
+		object = deref_tag(object, path, strlen(path));
+	if (object->type != OBJ_COMMIT)
+		return 0;
+	insert_by_date((struct commit *)object, list);
+	return 0;
+}
+
+/*
+ * This interprets names like ':/Initial revision of "git"' by searching
+ * through history and returning the first commit whose message starts
+ * with the given string.
+ *
+ * For future extension, ':/!' is reserved. If you want to match a message
+ * beginning with a '!', you have to repeat the exclamation mark.
+ */
+
+#define ONELINE_SEEN (1u<<20)
+static int get_sha1_oneline(const char *prefix, unsigned char *sha1)
+{
+	struct commit_list *list = NULL, *backup = NULL, *l;
+	int retval = -1;
+
+	if (prefix[0] == '!') {
+		if (prefix[1] != '!')
+			die ("Invalid search pattern: %s", prefix);
+		prefix++;
+	}
+	if (!save_commit_buffer)
+		return error("Could not expand oneline-name.");
+	for_each_ref(handle_one_ref, &list);
+	for (l = list; l; l = l->next)
+		commit_list_insert(l->item, &backup);
+	while (list) {
+		char *p;
+		struct commit *commit;
+
+		commit = pop_most_recent_commit(&list, ONELINE_SEEN);
+		parse_object(commit->object.sha1);
+		if (!commit->buffer || !(p = strstr(commit->buffer, "\n\n")))
+			continue;
+		if (!prefixcmp(p + 2, prefix)) {
+			hashcpy(sha1, commit->object.sha1);
+			retval = 0;
+			break;
+		}
+	}
+	free_commit_list(list);
+	for (l = backup; l; l = l->next)
+		clear_commit_marks(l->item, ONELINE_SEEN);
+	return retval;
+}
+
 /*
  * This is like "get_sha1_basic()", except it allows "sha1 expressions",
  * notably "xyz^" for "parent of xyz"
  */
 int get_sha1(const char *name, unsigned char *sha1)
 {
-	int ret, bracket_depth;
 	unsigned unused;
+	return get_sha1_with_mode(name, sha1, &unused);
+}
+
+int get_sha1_with_mode(const char *name, unsigned char *sha1, unsigned *mode)
+{
+	int ret, bracket_depth;
 	int namelen = strlen(name);
 	const char *cp;
 
-	prepare_alt_odb();
+	*mode = S_IFINVALID;
 	ret = get_sha1_1(name, namelen, sha1);
 	if (!ret)
 		return ret;
@@ -534,6 +669,8 @@ int get_sha1(const char *name, unsigned char *sha1)
 		int stage = 0;
 		struct cache_entry *ce;
 		int pos;
+		if (namelen > 2 && name[1] == '/')
+			return get_sha1_oneline(name + 2, sha1);
 		if (namelen < 3 ||
 		    name[2] != ':' ||
 		    name[1] < '0' || '3' < name[1])
@@ -545,8 +682,6 @@ int get_sha1(const char *name, unsigned char *sha1)
 		namelen = namelen - (cp - name);
 		if (!active_cache)
 			read_cache();
-		if (active_nr < 0)
-			return -1;
 		pos = cache_name_pos(cp, namelen);
 		if (pos < 0)
 			pos = -pos - 1;
@@ -557,6 +692,7 @@ int get_sha1(const char *name, unsigned char *sha1)
 				break;
 			if (ce_stage(ce) == stage) {
 				hashcpy(sha1, ce->sha1);
+				*mode = ntohl(ce->ce_mode);
 				return 0;
 			}
 			pos++;
@@ -575,7 +711,7 @@ int get_sha1(const char *name, unsigned char *sha1)
 		unsigned char tree_sha1[20];
 		if (!get_sha1_1(name, cp-name, tree_sha1))
 			return get_tree_entry(tree_sha1, cp+1, sha1,
-					      &unused);
+					      mode);
 	}
 	return ret;
 }