X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=rev-list.c;h=63391fc1136d4d4045db6406face4c53915cd5bf;hb=a348ab702a84983c258e4961a58b1b9502f428c8;hp=b5dbb9f4ec77cd5567e2f4ef90ab6a90ec83ab4d;hpb=cf4845441c3931731643859dc80a79e52bcd3e0f;p=git.git

diff --git a/rev-list.c b/rev-list.c
index b5dbb9f4..63391fc1 100644
--- a/rev-list.c
+++ b/rev-list.c
@@ -11,28 +11,40 @@
 #define INTERESTING	(1u << 1)
 #define COUNTED		(1u << 2)
 #define SHOWN		(1u << 3)
+#define TREECHANGE	(1u << 4)
+#define TMP_MARK	(1u << 5) /* for isolated cases; clean after use */
 
 static const char rev_list_usage[] =
-	"git-rev-list [OPTION] commit-id <commit-id>\n"
-		      "  --max-count=nr\n"
-		      "  --max-age=epoch\n"
-		      "  --min-age=epoch\n"
-		      "  --parents\n"
-		      "  --bisect\n"
-		      "  --objects\n"
-		      "  --unpacked\n"
-		      "  --header\n"
-		      "  --pretty\n"
-		      "  --no-merges\n"
-		      "  --merge-order [ --show-breaks ]\n"
-		      "  --topo-order";
-
+"git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
+"  limiting output:\n"
+"    --max-count=nr\n"
+"    --max-age=epoch\n"
+"    --min-age=epoch\n"
+"    --sparse\n"
+"    --no-merges\n"
+"    --remove-empty\n"
+"    --all\n"
+"  ordering output:\n"
+"    --merge-order [ --show-breaks ]\n"
+"    --topo-order\n"
+"  formatting output:\n"
+"    --parents\n"
+"    --objects\n"
+"    --unpacked\n"
+"    --header | --pretty\n"
+"    --abbrev=nr | --no-abbrev\n"
+"  special purpose:\n"
+"    --bisect"
+;
+
+static int dense = 1;
 static int unpacked = 0;
 static int bisect_list = 0;
 static int tag_objects = 0;
 static int tree_objects = 0;
 static int blob_objects = 0;
 static int verbose_header = 0;
+static int abbrev = DEFAULT_ABBREV;
 static int show_parents = 0;
 static int hdr_termination = 0;
 static const char *commit_prefix = "";
@@ -46,6 +58,7 @@ static int stop_traversal = 0;
 static int topo_order = 0;
 static int no_merges = 0;
 static const char **paths = NULL;
+static int remove_empty_trees = 0;
 
 static void show_commit(struct commit *commit)
 {
@@ -62,9 +75,21 @@ static void show_commit(struct commit *commit)
 	if (show_parents) {
 		struct commit_list *parents = commit->parents;
 		while (parents) {
-			printf(" %s", sha1_to_hex(parents->item->object.sha1));
+			struct object *o = &(parents->item->object);
 			parents = parents->next;
+			if (o->flags & TMP_MARK)
+				continue;
+			printf(" %s", sha1_to_hex(o->sha1));
+			o->flags |= TMP_MARK;
 		}
+		/* TMP_MARK is a general purpose flag that can
+		 * be used locally, but the user should clean
+		 * things up after it is done with them.
+		 */
+		for (parents = commit->parents;
+		     parents;
+		     parents = parents->next)
+			parents->item->object.flags &= ~TMP_MARK;
 	}
 	if (commit_format == CMIT_FMT_ONELINE)
 		putchar(' ');
@@ -73,12 +98,37 @@ static void show_commit(struct commit *commit)
 
 	if (verbose_header) {
 		static char pretty_header[16384];
-		pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
+		pretty_print_commit(commit_format, commit, ~0, pretty_header, sizeof(pretty_header), abbrev);
 		printf("%s%c", pretty_header, hdr_termination);
 	}
 	fflush(stdout);
 }
 
+static int rewrite_one(struct commit **pp)
+{
+	for (;;) {
+		struct commit *p = *pp;
+		if (p->object.flags & (TREECHANGE | UNINTERESTING))
+			return 0;
+		if (!p->parents)
+			return -1;
+		*pp = p->parents->item;
+	}
+}
+
+static void rewrite_parents(struct commit *commit)
+{
+	struct commit_list **pp = &commit->parents;
+	while (*pp) {
+		struct commit_list *parent = *pp;
+		if (rewrite_one(&parent->item) < 0) {
+			*pp = parent->next;
+			continue;
+		}
+		pp = &parent->next;
+	}
+}
+
 static int filter_commit(struct commit * commit)
 {
 	if (stop_traversal && (commit->object.flags & BOUNDARY))
@@ -91,10 +141,13 @@ static int filter_commit(struct commit * commit)
 		stop_traversal=1;
 		return CONTINUE;
 	}
-	if (max_count != -1 && !max_count--)
-		return STOP;
 	if (no_merges && (commit->parents && commit->parents->next))
 		return CONTINUE;
+	if (paths && dense) {
+		if (!(commit->object.flags & TREECHANGE))
+			return CONTINUE;
+		rewrite_parents(commit);
+	}
 	return DO;
 }
 
@@ -110,6 +163,9 @@ static int process_commit(struct commit * commit)
 		return CONTINUE;
 	}
 
+	if (max_count != -1 && !max_count--)
+		return STOP;
+
 	show_commit(commit);
 
 	return CONTINUE;
@@ -311,7 +367,8 @@ static int count_distance(struct commit_list *entry)
 
 		if (commit->object.flags & (UNINTERESTING | COUNTED))
 			break;
-		nr++;
+		if (!paths || (commit->object.flags & TREECHANGE))
+			nr++;
 		commit->object.flags |= COUNTED;
 		p = commit->parents;
 		entry = p;
@@ -323,6 +380,7 @@ static int count_distance(struct commit_list *entry)
 			}
 		}
 	}
+
 	return nr;
 }
 
@@ -343,15 +401,20 @@ static struct commit_list *find_bisection(struct commit_list *list)
 	nr = 0;
 	p = list;
 	while (p) {
-		nr++;
+		if (!paths || (p->item->object.flags & TREECHANGE))
+			nr++;
 		p = p->next;
 	}
 	closest = 0;
 	best = list;
 
-	p = list;
-	while (p) {
-		int distance = count_distance(p);
+	for (p = list; p; p = p->next) {
+		int distance;
+
+		if (paths && !(p->item->object.flags & TREECHANGE))
+			continue;
+
+		distance = count_distance(p);
 		clear_distance(list);
 		if (nr - distance < distance)
 			distance = nr - distance;
@@ -359,7 +422,6 @@ static struct commit_list *find_bisection(struct commit_list *list)
 			best = p;
 			closest = distance;
 		}
-		p = p->next;
 	}
 	if (best)
 		best->next = NULL;
@@ -379,14 +441,33 @@ static void mark_edges_uninteresting(struct commit_list *list)
 	}
 }
 
-static int is_different = 0;
+#define TREE_SAME	0
+#define TREE_NEW	1
+#define TREE_DIFFERENT	2
+static int tree_difference = TREE_SAME;
 
 static void file_add_remove(struct diff_options *options,
 		    int addremove, unsigned mode,
 		    const unsigned char *sha1,
 		    const char *base, const char *path)
 {
-	is_different = 1;
+	int diff = TREE_DIFFERENT;
+
+	/*
+	 * Is it an add of a new file? It means that
+	 * the old tree didn't have it at all, so we
+	 * will turn "TREE_SAME" -> "TREE_NEW", but
+	 * leave any "TREE_DIFFERENT" alone (and if
+	 * it already was "TREE_NEW", we'll keep it
+	 * "TREE_NEW" of course).
+	 */
+	if (addremove == '+') {
+		diff = tree_difference;
+		if (diff != TREE_SAME)
+			return;
+		diff = TREE_NEW;
+	}
+	tree_difference = diff;
 }
 
 static void file_change(struct diff_options *options,
@@ -395,7 +476,7 @@ static void file_change(struct diff_options *options,
 		 const unsigned char *new_sha1,
 		 const char *base, const char *path)
 {
-	is_different = 1;
+	tree_difference = TREE_DIFFERENT;
 }
 
 static struct diff_options diff_opt = {
@@ -404,25 +485,84 @@ static struct diff_options diff_opt = {
 	.change = file_change,
 };
 
-static struct commit *try_to_simplify_merge(struct commit *commit, struct commit_list *parent)
+static int compare_tree(struct tree *t1, struct tree *t2)
+{
+	if (!t1)
+		return TREE_NEW;
+	if (!t2)
+		return TREE_DIFFERENT;
+	tree_difference = TREE_SAME;
+	if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "", &diff_opt) < 0)
+		return TREE_DIFFERENT;
+	return tree_difference;
+}
+
+static int same_tree_as_empty(struct tree *t1)
 {
+	int retval;
+	void *tree;
+	struct tree_desc empty, real;
+
+	if (!t1)
+		return 0;
+
+	tree = read_object_with_reference(t1->object.sha1, "tree", &real.size, NULL);
+	if (!tree)
+		return 0;
+	real.buf = tree;
+
+	empty.buf = "";
+	empty.size = 0;
+
+	tree_difference = 0;
+	retval = diff_tree(&empty, &real, "", &diff_opt);
+	free(tree);
+
+	return retval >= 0 && !tree_difference;
+}
+
+static void try_to_simplify_commit(struct commit *commit)
+{
+	struct commit_list **pp, *parent;
+
 	if (!commit->tree)
-		return NULL;
+		return;
 
-	while (parent) {
+	if (!commit->parents) {
+		if (!same_tree_as_empty(commit->tree))
+			commit->object.flags |= TREECHANGE;
+		return;
+	}
+
+	pp = &commit->parents;
+	while ((parent = *pp) != NULL) {
 		struct commit *p = parent->item;
-		parent = parent->next;
-		parse_commit(p);
-		if (!p->tree)
+
+		if (p->object.flags & UNINTERESTING) {
+			pp = &parent->next;
 			continue;
-		is_different = 0;
-		if (diff_tree_sha1(commit->tree->object.sha1,
-				   p->tree->object.sha1, "", &diff_opt) < 0)
+		}
+
+		parse_commit(p);
+		switch (compare_tree(p->tree, commit->tree)) {
+		case TREE_SAME:
+			parent->next = NULL;
+			commit->parents = parent;
+			return;
+
+		case TREE_NEW:
+			if (remove_empty_trees && same_tree_as_empty(p->tree)) {
+				*pp = parent->next;
+				continue;
+			}
+		/* fallthrough */
+		case TREE_DIFFERENT:
+			pp = &parent->next;
 			continue;
-		if (!is_different)
-			return p;
+		}
+		die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
 	}
-	return NULL;
+	commit->object.flags |= TREECHANGE;
 }
 
 static void add_parents_to_list(struct commit *commit, struct commit_list **list)
@@ -458,20 +598,14 @@ static void add_parents_to_list(struct commit *commit, struct commit_list **list
 	}
 
 	/*
-	 * Ok, the commit wasn't uninteresting. If it
-	 * is a merge, try to find the parent that has
-	 * no differences in the path set if one exists.
+	 * Ok, the commit wasn't uninteresting. Try to
+	 * simplify the commit history and find the parent
+	 * that has no differences in the path set if one exists.
 	 */
-	if (paths && parent && parent->next) {
-		struct commit *preferred;
-
-		preferred = try_to_simplify_merge(commit, parent);
-		if (preferred) {
-			parent->item = preferred;
-			parent->next = NULL;
-		}
-	}
+	if (paths)
+		try_to_simplify_commit(commit);
 
+	parent = commit->parents;
 	while (parent) {
 		struct commit *p = parent->item;
 
@@ -524,13 +658,10 @@ static void add_pending_object(struct object *obj, const char *name)
 	add_object(obj, &pending_objects, name);
 }
 
-static struct commit *get_commit_reference(const char *name, unsigned int flags)
+static struct commit *get_commit_reference(const char *name, const unsigned char *sha1, unsigned int flags)
 {
-	unsigned char sha1[20];
 	struct object *object;
 
-	if (get_sha1(name, sha1))
-		usage(rev_list_usage);
 	object = parse_object(sha1);
 	if (!object)
 		die("bad object %s", name);
@@ -608,7 +739,7 @@ static struct commit_list **global_lst;
 
 static int include_one_commit(const char *path, const unsigned char *sha1)
 {
-	struct commit *com = get_commit_reference(path, 0);
+	struct commit *com = get_commit_reference(path, sha1, 0);
 	handle_one_commit(com, global_lst);
 	return 0;
 }
@@ -631,7 +762,23 @@ int main(int argc, const char **argv)
 		const char *arg = argv[i];
 		char *dotdot;
 		struct commit *commit;
+		unsigned char sha1[20];
 
+		/* accept -<digit>, like traditilnal "head" */
+		if ((*arg == '-') && isdigit(arg[1])) {
+			max_count = atoi(arg + 1);
+			continue;
+		}
+		if (!strcmp(arg, "-n")) {
+			if (++i >= argc)
+				die("-n requires an argument");
+			max_count = atoi(argv[i]);
+			continue;
+		}
+		if (!strncmp(arg,"-n",2)) {
+			max_count = atoi(arg + 2);
+			continue;
+		}
 		if (!strncmp(arg, "--max-count=", 12)) {
 			max_count = atoi(arg + 12);
 			continue;
@@ -650,6 +797,18 @@ int main(int argc, const char **argv)
 			verbose_header = 1;
 			continue;
 		}
+		if (!strcmp(arg, "--no-abbrev")) {
+			abbrev = 0;
+			continue;
+		}
+		if (!strncmp(arg, "--abbrev=", 9)) {
+			abbrev = strtoul(arg + 9, NULL, 10);
+			if (abbrev && abbrev < MINIMUM_ABBREV)
+				abbrev = MINIMUM_ABBREV;
+			else if (40 < abbrev)
+				abbrev = 40;
+			continue;
+		}
 		if (!strncmp(arg, "--pretty", 8)) {
 			commit_format = get_commit_format(arg+8);
 			verbose_header = 1;
@@ -700,12 +859,20 @@ int main(int argc, const char **argv)
 		        limited = 1;
 			continue;
 		}
+		if (!strcmp(arg, "--dense")) {
+			dense = 1;
+			continue;
+		}
+		if (!strcmp(arg, "--sparse")) {
+			dense = 0;
+			continue;
+		}
+		if (!strcmp(arg, "--remove-empty")) {
+			remove_empty_trees = 1;
+			continue;
+		}
 		if (!strcmp(arg, "--")) {
-			paths = get_pathspec(prefix, argv + i + 1);
-			if (paths) {
-				limited = 1;
-				diff_tree_setup_paths(paths);
-			}
+			i++;
 			break;
 		}
 
@@ -715,15 +882,19 @@ int main(int argc, const char **argv)
 		flags = 0;
 		dotdot = strstr(arg, "..");
 		if (dotdot) {
+			unsigned char from_sha1[20];
 			char *next = dotdot + 2;
-			struct commit *exclude = NULL;
-			struct commit *include = NULL;
 			*dotdot = 0;
 			if (!*next)
 				next = "HEAD";
-			exclude = get_commit_reference(arg, UNINTERESTING);
-			include = get_commit_reference(next, 0);
-			if (exclude && include) {
+			if (!get_sha1(arg, from_sha1) && !get_sha1(next, sha1)) {
+				struct commit *exclude;
+				struct commit *include;
+				
+				exclude = get_commit_reference(arg, from_sha1, UNINTERESTING);
+				include = get_commit_reference(next, sha1, 0);
+				if (!exclude || !include)
+					die("Invalid revision range %s..%s", arg, next);
 				limited = 1;
 				handle_one_commit(exclude, &list);
 				handle_one_commit(include, &list);
@@ -736,10 +907,26 @@ int main(int argc, const char **argv)
 			arg++;
 			limited = 1;
 		}
-		commit = get_commit_reference(arg, flags);
+		if (get_sha1(arg, sha1) < 0) {
+			struct stat st;
+			if (lstat(arg, &st) < 0)
+				die("'%s': %s", arg, strerror(errno));
+			break;
+		}
+		commit = get_commit_reference(arg, sha1, flags);
 		handle_one_commit(commit, &list);
 	}
 
+	if (!list &&
+	    (!(tag_objects||tree_objects||blob_objects) && !pending_objects))
+		usage(rev_list_usage);
+
+	paths = get_pathspec(prefix, argv + i);
+	if (paths) {
+		limited = 1;
+		diff_tree_setup_paths(paths);
+	}
+
 	save_commit_buffer = verbose_header;
 	track_object_refs = 0;