Make "git rev-list" be a builtin

This was surprisingly easy. The diff is truly minimal: rename "main()" to
"cmd_rev_list()" in rev-list.c, and rename the whole file to reflect its
new built-in status.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 358 insertions, 0 deletions

diff --git a/builtin-rev-list.c b/builtin-rev-list.c
new file mode 100644
index 0000000000..446802d377
--- /dev/null
+++ b/builtin-rev-list.c
@@ -0,0 +1,358 @@
+#include "cache.h"
+#include "refs.h"
+#include "tag.h"
+#include "commit.h"
+#include "tree.h"
+#include "blob.h"
+#include "tree-walk.h"
+#include "diff.h"
+#include "revision.h"
+#include "builtin.h"
+
+/* bits #0-15 in revision.h */
+
+#define COUNTED		(1u<<16)
+
+static const char rev_list_usage[] =
+"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"
+"    --topo-order\n"
+"    --date-order\n"
+"  formatting output:\n"
+"    --parents\n"
+"    --objects | --objects-edge\n"
+"    --unpacked\n"
+"    --header | --pretty\n"
+"    --abbrev=nr | --no-abbrev\n"
+"    --abbrev-commit\n"
+"  special purpose:\n"
+"    --bisect"
+;
+
+static struct rev_info revs;
+
+static int bisect_list = 0;
+static int show_timestamp = 0;
+static int hdr_termination = 0;
+static const char *header_prefix;
+
+static void show_commit(struct commit *commit)
+{
+	if (show_timestamp)
+		printf("%lu ", commit->date);
+	if (header_prefix)
+		fputs(header_prefix, stdout);
+	if (commit->object.flags & BOUNDARY)
+		putchar('-');
+	if (revs.abbrev_commit && revs.abbrev)
+		fputs(find_unique_abbrev(commit->object.sha1, revs.abbrev),
+		      stdout);
+	else
+		fputs(sha1_to_hex(commit->object.sha1), stdout);
+	if (revs.parents) {
+		struct commit_list *parents = commit->parents;
+		while (parents) {
+			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 (revs.commit_format == CMIT_FMT_ONELINE)
+		putchar(' ');
+	else
+		putchar('\n');
+
+	if (revs.verbose_header) {
+		static char pretty_header[16384];
+		pretty_print_commit(revs.commit_format, commit, ~0,
+				    pretty_header, sizeof(pretty_header),
+				    revs.abbrev);
+		printf("%s%c", pretty_header, hdr_termination);
+	}
+	fflush(stdout);
+}
+
+static struct object_list **process_blob(struct blob *blob,
+					 struct object_list **p,
+					 struct name_path *path,
+					 const char *name)
+{
+	struct object *obj = &blob->object;
+
+	if (!revs.blob_objects)
+		return p;
+	if (obj->flags & (UNINTERESTING | SEEN))
+		return p;
+	obj->flags |= SEEN;
+	return add_object(obj, p, path, name);
+}
+
+static struct object_list **process_tree(struct tree *tree,
+					 struct object_list **p,
+					 struct name_path *path,
+					 const char *name)
+{
+	struct object *obj = &tree->object;
+	struct tree_entry_list *entry;
+	struct name_path me;
+
+	if (!revs.tree_objects)
+		return p;
+	if (obj->flags & (UNINTERESTING | SEEN))
+		return p;
+	if (parse_tree(tree) < 0)
+		die("bad tree object %s", sha1_to_hex(obj->sha1));
+	obj->flags |= SEEN;
+	p = add_object(obj, p, path, name);
+	me.up = path;
+	me.elem = name;
+	me.elem_len = strlen(name);
+	entry = tree->entries;
+	tree->entries = NULL;
+	while (entry) {
+		struct tree_entry_list *next = entry->next;
+		if (entry->directory)
+			p = process_tree(entry->item.tree, p, &me, entry->name);
+		else
+			p = process_blob(entry->item.blob, p, &me, entry->name);
+		free(entry);
+		entry = next;
+	}
+	return p;
+}
+
+static void show_commit_list(struct rev_info *revs)
+{
+	struct commit *commit;
+	struct object_list *objects = NULL, **p = &objects, *pending;
+
+	while ((commit = get_revision(revs)) != NULL) {
+		p = process_tree(commit->tree, p, NULL, "");
+		show_commit(commit);
+	}
+	for (pending = revs->pending_objects; pending; pending = pending->next) {
+		struct object *obj = pending->item;
+		const char *name = pending->name;
+		if (obj->flags & (UNINTERESTING | SEEN))
+			continue;
+		if (obj->type == tag_type) {
+			obj->flags |= SEEN;
+			p = add_object(obj, p, NULL, name);
+			continue;
+		}
+		if (obj->type == tree_type) {
+			p = process_tree((struct tree *)obj, p, NULL, name);
+			continue;
+		}
+		if (obj->type == blob_type) {
+			p = process_blob((struct blob *)obj, p, NULL, name);
+			continue;
+		}
+		die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
+	}
+	while (objects) {
+		/* An object with name "foo\n0000000..." can be used to
+		 * confuse downstream git-pack-objects very badly.
+		 */
+		const char *ep = strchr(objects->name, '\n');
+		if (ep) {
+			printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
+			       (int) (ep - objects->name),
+			       objects->name);
+		}
+		else
+			printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
+		objects = objects->next;
+	}
+}
+
+/*
+ * This is a truly stupid algorithm, but it's only
+ * used for bisection, and we just don't care enough.
+ *
+ * We care just barely enough to avoid recursing for
+ * non-merge entries.
+ */
+static int count_distance(struct commit_list *entry)
+{
+	int nr = 0;
+
+	while (entry) {
+		struct commit *commit = entry->item;
+		struct commit_list *p;
+
+		if (commit->object.flags & (UNINTERESTING | COUNTED))
+			break;
+		if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
+			nr++;
+		commit->object.flags |= COUNTED;
+		p = commit->parents;
+		entry = p;
+		if (p) {
+			p = p->next;
+			while (p) {
+				nr += count_distance(p);
+				p = p->next;
+			}
+		}
+	}
+
+	return nr;
+}
+
+static void clear_distance(struct commit_list *list)
+{
+	while (list) {
+		struct commit *commit = list->item;
+		commit->object.flags &= ~COUNTED;
+		list = list->next;
+	}
+}
+
+static struct commit_list *find_bisection(struct commit_list *list)
+{
+	int nr, closest;
+	struct commit_list *p, *best;
+
+	nr = 0;
+	p = list;
+	while (p) {
+		if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
+			nr++;
+		p = p->next;
+	}
+	closest = 0;
+	best = list;
+
+	for (p = list; p; p = p->next) {
+		int distance;
+
+		if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
+			continue;
+
+		distance = count_distance(p);
+		clear_distance(list);
+		if (nr - distance < distance)
+			distance = nr - distance;
+		if (distance > closest) {
+			best = p;
+			closest = distance;
+		}
+	}
+	if (best)
+		best->next = NULL;
+	return best;
+}
+
+static void mark_edge_parents_uninteresting(struct commit *commit)
+{
+	struct commit_list *parents;
+
+	for (parents = commit->parents; parents; parents = parents->next) {
+		struct commit *parent = parents->item;
+		if (!(parent->object.flags & UNINTERESTING))
+			continue;
+		mark_tree_uninteresting(parent->tree);
+		if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
+			parent->object.flags |= SHOWN;
+			printf("-%s\n", sha1_to_hex(parent->object.sha1));
+		}
+	}
+}
+
+static void mark_edges_uninteresting(struct commit_list *list)
+{
+	for ( ; list; list = list->next) {
+		struct commit *commit = list->item;
+
+		if (commit->object.flags & UNINTERESTING) {
+			mark_tree_uninteresting(commit->tree);
+			continue;
+		}
+		mark_edge_parents_uninteresting(commit);
+	}
+}
+
+int cmd_rev_list(int argc, const char **argv, char **envp)
+{
+	struct commit_list *list;
+	int i;
+
+	init_revisions(&revs);
+	revs.abbrev = 0;
+	revs.commit_format = CMIT_FMT_UNSPECIFIED;
+	argc = setup_revisions(argc, argv, &revs, NULL);
+
+	for (i = 1 ; i < argc; i++) {
+		const char *arg = argv[i];
+
+		if (!strcmp(arg, "--header")) {
+			revs.verbose_header = 1;
+			continue;
+		}
+		if (!strcmp(arg, "--timestamp")) {
+			show_timestamp = 1;
+			continue;
+		}
+		if (!strcmp(arg, "--bisect")) {
+			bisect_list = 1;
+			continue;
+		}
+		usage(rev_list_usage);
+
+	}
+	if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
+		/* The command line has a --pretty  */
+		hdr_termination = '\n';
+		if (revs.commit_format == CMIT_FMT_ONELINE)
+			header_prefix = "";
+		else
+			header_prefix = "commit ";
+	}
+	else if (revs.verbose_header)
+		/* Only --header was specified */
+		revs.commit_format = CMIT_FMT_RAW;
+
+	list = revs.commits;
+
+	if ((!list &&
+	     (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
+	      !revs.pending_objects)) ||
+	    revs.diff)
+		usage(rev_list_usage);
+
+	save_commit_buffer = revs.verbose_header;
+	track_object_refs = 0;
+	if (bisect_list)
+		revs.limited = 1;
+
+	prepare_revision_walk(&revs);
+	if (revs.tree_objects)
+		mark_edges_uninteresting(revs.commits);
+
+	if (bisect_list)
+		revs.commits = find_bisection(revs.commits);
+
+	show_commit_list(&revs);
+
+	return 0;
+}