1 files changed, 578 insertions, 474 deletions

diff --git a/builtin/branch.c b/builtin/branch.c
index fe8f2fcd52..79dc9181fd 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -6,6 +6,7 @@
  */
 
 #include "cache.h"
+#include "config.h"
 #include "color.h"
 #include "refs.h"
 #include "commit.h"
@@ -15,80 +16,89 @@
 #include "branch.h"
 #include "diff.h"
 #include "revision.h"
+#include "string-list.h"
+#include "column.h"
+#include "utf8.h"
+#include "wt-status.h"
+#include "ref-filter.h"
+#include "worktree.h"
 
 static const char * const builtin_branch_usage[] = {
-	"git branch [options] [-r | -a] [--merged | --no-merged]",
-	"git branch [options] [-l] [-f] <branchname> [<start-point>]",
-	"git branch [options] [-r] (-d | -D) <branchname>",
-	"git branch [options] (-m | -M) [<oldbranch>] <newbranch>",
+	N_("git branch [<options>] [-r | -a] [--merged | --no-merged]"),
+	N_("git branch [<options>] [-l] [-f] <branch-name> [<start-point>]"),
+	N_("git branch [<options>] [-r] (-d | -D) <branch-name>..."),
+	N_("git branch [<options>] (-m | -M) [<old-branch>] <new-branch>"),
+	N_("git branch [<options>] (-c | -C) [<old-branch>] <new-branch>"),
+	N_("git branch [<options>] [-r | -a] [--points-at]"),
+	N_("git branch [<options>] [-r | -a] [--format]"),
 	NULL
 };
 
-#define REF_LOCAL_BRANCH    0x01
-#define REF_REMOTE_BRANCH   0x02
-
 static const char *head;
-static unsigned char head_sha1[20];
+static struct object_id head_oid;
 
 static int branch_use_color = -1;
 static char branch_colors[][COLOR_MAXLEN] = {
 	GIT_COLOR_RESET,
-	GIT_COLOR_NORMAL,	/* PLAIN */
-	GIT_COLOR_RED,		/* REMOTE */
-	GIT_COLOR_NORMAL,	/* LOCAL */
-	GIT_COLOR_GREEN,	/* CURRENT */
+	GIT_COLOR_NORMAL,       /* PLAIN */
+	GIT_COLOR_RED,          /* REMOTE */
+	GIT_COLOR_NORMAL,       /* LOCAL */
+	GIT_COLOR_GREEN,        /* CURRENT */
+	GIT_COLOR_BLUE,         /* UPSTREAM */
 };
 enum color_branch {
 	BRANCH_COLOR_RESET = 0,
 	BRANCH_COLOR_PLAIN = 1,
 	BRANCH_COLOR_REMOTE = 2,
 	BRANCH_COLOR_LOCAL = 3,
-	BRANCH_COLOR_CURRENT = 4
+	BRANCH_COLOR_CURRENT = 4,
+	BRANCH_COLOR_UPSTREAM = 5
 };
 
-static enum merge_filter {
-	NO_FILTER = 0,
-	SHOW_NOT_MERGED,
-	SHOW_MERGED
-} merge_filter;
-static unsigned char merge_filter_ref[20];
+static struct string_list output = STRING_LIST_INIT_DUP;
+static unsigned int colopts;
 
-static int parse_branch_color_slot(const char *var, int ofs)
+static int parse_branch_color_slot(const char *slot)
 {
-	if (!strcasecmp(var+ofs, "plain"))
+	if (!strcasecmp(slot, "plain"))
 		return BRANCH_COLOR_PLAIN;
-	if (!strcasecmp(var+ofs, "reset"))
+	if (!strcasecmp(slot, "reset"))
 		return BRANCH_COLOR_RESET;
-	if (!strcasecmp(var+ofs, "remote"))
+	if (!strcasecmp(slot, "remote"))
 		return BRANCH_COLOR_REMOTE;
-	if (!strcasecmp(var+ofs, "local"))
+	if (!strcasecmp(slot, "local"))
 		return BRANCH_COLOR_LOCAL;
-	if (!strcasecmp(var+ofs, "current"))
+	if (!strcasecmp(slot, "current"))
 		return BRANCH_COLOR_CURRENT;
+	if (!strcasecmp(slot, "upstream"))
+		return BRANCH_COLOR_UPSTREAM;
 	return -1;
 }
 
 static int git_branch_config(const char *var, const char *value, void *cb)
 {
+	const char *slot_name;
+
+	if (starts_with(var, "column."))
+		return git_column_config(var, value, "branch", &colopts);
 	if (!strcmp(var, "color.branch")) {
-		branch_use_color = git_config_colorbool(var, value, -1);
+		branch_use_color = git_config_colorbool(var, value);
 		return 0;
 	}
-	if (!prefixcmp(var, "color.branch.")) {
-		int slot = parse_branch_color_slot(var, 13);
+	if (skip_prefix(var, "color.branch.", &slot_name)) {
+		int slot = parse_branch_color_slot(slot_name);
 		if (slot < 0)
 			return 0;
 		if (!value)
 			return config_error_nonbool(var);
-		color_parse(value, var, branch_colors[slot]);
-		return 0;
+		return color_parse(value, branch_colors[slot]);
 	}
 	return git_color_default_config(var, value, cb);
 }
 
 static const char *branch_get_color(enum color_branch ix)
 {
-	if (branch_use_color > 0)
+	if (want_color(branch_use_color))
 		return branch_colors[ix];
 	return "";
 }
@@ -104,24 +114,24 @@ static int branch_merged(int kind, const char *name,
 	 */
 	struct commit *reference_rev = NULL;
 	const char *reference_name = NULL;
+	void *reference_name_to_free = NULL;
 	int merged;
 
-	if (kind == REF_LOCAL_BRANCH) {
+	if (kind == FILTER_REFS_BRANCHES) {
 		struct branch *branch = branch_get(name);
-		unsigned char sha1[20];
-
-		if (branch &&
-		    branch->merge &&
-		    branch->merge[0] &&
-		    branch->merge[0]->dst &&
-		    (reference_name =
-		     resolve_ref(branch->merge[0]->dst, sha1, 1, NULL)) != NULL)
-			reference_rev = lookup_commit_reference(sha1);
+		const char *upstream = branch_get_upstream(branch, NULL);
+		struct object_id oid;
+
+		if (upstream &&
+		    (reference_name = reference_name_to_free =
+		     resolve_refdup(upstream, RESOLVE_REF_READING,
+				    oid.hash, NULL)) != NULL)
+			reference_rev = lookup_commit_reference(&oid);
 	}
 	if (!reference_rev)
 		reference_rev = head_rev;
 
-	merged = in_merge_bases(rev, &reference_rev, 1);
+	merged = in_merge_bases(rev, reference_rev);
 
 	/*
 	 * After the safety valve is fully redefined to "check with
@@ -131,579 +141,673 @@ static int branch_merged(int kind, const char *name,
 	 * a gentle reminder is in order.
 	 */
 	if ((head_rev != reference_rev) &&
-	    in_merge_bases(rev, &head_rev, 1) != merged) {
+	    in_merge_bases(rev, head_rev) != merged) {
 		if (merged)
-			warning("deleting branch '%s' that has been merged to\n"
-				"         '%s', but not yet been merged to HEAD.",
+			warning(_("deleting branch '%s' that has been merged to\n"
+				"         '%s', but not yet merged to HEAD."),
 				name, reference_name);
 		else
-			warning("not deleting branch '%s' that is not yet merged to\n"
-				"         '%s', even though it is merged to HEAD.",
+			warning(_("not deleting branch '%s' that is not yet merged to\n"
+				"         '%s', even though it is merged to HEAD."),
 				name, reference_name);
 	}
+	free(reference_name_to_free);
 	return merged;
 }
 
-static int delete_branches(int argc, const char **argv, int force, int kinds)
+static int check_branch_commit(const char *branchname, const char *refname,
+			       const struct object_id *oid, struct commit *head_rev,
+			       int kinds, int force)
+{
+	struct commit *rev = lookup_commit_reference(oid);
+	if (!rev) {
+		error(_("Couldn't look up commit object for '%s'"), refname);
+		return -1;
+	}
+	if (!force && !branch_merged(kinds, branchname, rev, head_rev)) {
+		error(_("The branch '%s' is not fully merged.\n"
+		      "If you are sure you want to delete it, "
+		      "run 'git branch -D %s'."), branchname, branchname);
+		return -1;
+	}
+	return 0;
+}
+
+static void delete_branch_config(const char *branchname)
 {
-	struct commit *rev, *head_rev = NULL;
-	unsigned char sha1[20];
+	struct strbuf buf = STRBUF_INIT;
+	strbuf_addf(&buf, "branch.%s", branchname);
+	if (git_config_rename_section(buf.buf, NULL) < 0)
+		warning(_("Update of config-file failed"));
+	strbuf_release(&buf);
+}
+
+static int delete_branches(int argc, const char **argv, int force, int kinds,
+			   int quiet)
+{
+	struct commit *head_rev = NULL;
+	struct object_id oid;
 	char *name = NULL;
-	const char *fmt, *remote;
+	const char *fmt;
 	int i;
 	int ret = 0;
+	int remote_branch = 0;
 	struct strbuf bname = STRBUF_INIT;
+	unsigned allowed_interpret;
 
 	switch (kinds) {
-	case REF_REMOTE_BRANCH:
+	case FILTER_REFS_REMOTES:
 		fmt = "refs/remotes/%s";
-		remote = "remote ";
+		/* For subsequent UI messages */
+		remote_branch = 1;
+		allowed_interpret = INTERPRET_BRANCH_REMOTE;
+
 		force = 1;
 		break;
-	case REF_LOCAL_BRANCH:
+	case FILTER_REFS_BRANCHES:
 		fmt = "refs/heads/%s";
-		remote = "";
+		allowed_interpret = INTERPRET_BRANCH_LOCAL;
 		break;
 	default:
-		die("cannot use -a with -d");
+		die(_("cannot use -a with -d"));
 	}
 
 	if (!force) {
-		head_rev = lookup_commit_reference(head_sha1);
+		head_rev = lookup_commit_reference(&head_oid);
 		if (!head_rev)
-			die("Couldn't look up commit object for HEAD");
+			die(_("Couldn't look up commit object for HEAD"));
 	}
-	for (i = 0; i < argc; i++, strbuf_release(&bname)) {
-		strbuf_branchname(&bname, argv[i]);
-		if (kinds == REF_LOCAL_BRANCH && !strcmp(head, bname.buf)) {
-			error("Cannot delete the branch '%s' "
-			      "which you are currently on.", bname.buf);
-			ret = 1;
-			continue;
-		}
+	for (i = 0; i < argc; i++, strbuf_reset(&bname)) {
+		char *target = NULL;
+		int flags = 0;
 
+		strbuf_branchname(&bname, argv[i], allowed_interpret);
 		free(name);
-
-		name = xstrdup(mkpath(fmt, bname.buf));
-		if (!resolve_ref(name, sha1, 1, NULL)) {
-			error("%sbranch '%s' not found.",
-					remote, bname.buf);
-			ret = 1;
-			continue;
+		name = mkpathdup(fmt, bname.buf);
+
+		if (kinds == FILTER_REFS_BRANCHES) {
+			const struct worktree *wt =
+				find_shared_symref("HEAD", name);
+			if (wt) {
+				error(_("Cannot delete branch '%s' "
+					"checked out at '%s'"),
+				      bname.buf, wt->path);
+				ret = 1;
+				continue;
+			}
 		}
 
-		rev = lookup_commit_reference(sha1);
-		if (!rev) {
-			error("Couldn't look up commit object for '%s'", name);
+		target = resolve_refdup(name,
+					RESOLVE_REF_READING
+					| RESOLVE_REF_NO_RECURSE
+					| RESOLVE_REF_ALLOW_BAD_NAME,
+					oid.hash, &flags);
+		if (!target) {
+			error(remote_branch
+			      ? _("remote-tracking branch '%s' not found.")
+			      : _("branch '%s' not found."), bname.buf);
 			ret = 1;
 			continue;
 		}
 
-		if (!force && !branch_merged(kinds, bname.buf, rev, head_rev)) {
-			error("The branch '%s' is not fully merged.\n"
-			      "If you are sure you want to delete it, "
-			      "run 'git branch -D %s'.", bname.buf, bname.buf);
+		if (!(flags & (REF_ISSYMREF|REF_ISBROKEN)) &&
+		    check_branch_commit(bname.buf, name, &oid, head_rev, kinds,
+					force)) {
 			ret = 1;
-			continue;
+			goto next;
 		}
 
-		if (delete_ref(name, sha1, 0)) {
-			error("Error deleting %sbranch '%s'", remote,
+		if (delete_ref(NULL, name, is_null_oid(&oid) ? NULL : oid.hash,
+			       REF_NODEREF)) {
+			error(remote_branch
+			      ? _("Error deleting remote-tracking branch '%s'")
+			      : _("Error deleting branch '%s'"),
 			      bname.buf);
 			ret = 1;
-		} else {
-			struct strbuf buf = STRBUF_INIT;
-			printf("Deleted %sbranch %s (was %s).\n", remote,
+			goto next;
+		}
+		if (!quiet) {
+			printf(remote_branch
+			       ? _("Deleted remote-tracking branch %s (was %s).\n")
+			       : _("Deleted branch %s (was %s).\n"),
 			       bname.buf,
-			       find_unique_abbrev(sha1, DEFAULT_ABBREV));
-			strbuf_addf(&buf, "branch.%s", bname.buf);
-			if (git_config_rename_section(buf.buf, NULL) < 0)
-				warning("Update of config-file failed");
-			strbuf_release(&buf);
+			       (flags & REF_ISBROKEN) ? "broken"
+			       : (flags & REF_ISSYMREF) ? target
+			       : find_unique_abbrev(oid.hash, DEFAULT_ABBREV));
 		}
+		delete_branch_config(bname.buf);
+
+	next:
+		free(target);
 	}
 
 	free(name);
+	strbuf_release(&bname);
 
-	return(ret);
+	return ret;
 }
 
-struct ref_item {
-	char *name;
-	char *dest;
-	unsigned int kind, len;
-	struct commit *commit;
-};
-
-struct ref_list {
-	struct rev_info revs;
-	int index, alloc, maxwidth, verbose, abbrev;
-	struct ref_item *list;
-	struct commit_list *with_commit;
-	int kinds;
-};
-
-static char *resolve_symref(const char *src, const char *prefix)
+static int calc_maxwidth(struct ref_array *refs, int remote_bonus)
 {
-	unsigned char sha1[20];
-	int flag;
-	const char *dst, *cp;
-
-	dst = resolve_ref(src, sha1, 0, &flag);
-	if (!(dst && (flag & REF_ISSYMREF)))
-		return NULL;
-	if (prefix && (cp = skip_prefix(dst, prefix)))
-		dst = cp;
-	return xstrdup(dst);
+	int i, max = 0;
+	for (i = 0; i < refs->nr; i++) {
+		struct ref_array_item *it = refs->items[i];
+		const char *desc = it->refname;
+		int w;
+
+		skip_prefix(it->refname, "refs/heads/", &desc);
+		skip_prefix(it->refname, "refs/remotes/", &desc);
+		if (it->kind == FILTER_REFS_DETACHED_HEAD) {
+			char *head_desc = get_head_description();
+			w = utf8_strwidth(head_desc);
+			free(head_desc);
+		} else
+			w = utf8_strwidth(desc);
+
+		if (it->kind == FILTER_REFS_REMOTES)
+			w += remote_bonus;
+		if (w > max)
+			max = w;
+	}
+	return max;
 }
 
-struct append_ref_cb {
-	struct ref_list *ref_list;
-	int ret;
-};
-
-static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
+static const char *quote_literal_for_format(const char *s)
 {
-	struct append_ref_cb *cb = (struct append_ref_cb *)(cb_data);
-	struct ref_list *ref_list = cb->ref_list;
-	struct ref_item *newitem;
-	struct commit *commit;
-	int kind, i;
-	const char *prefix, *orig_refname = refname;
-
-	static struct {
-		int kind;
-		const char *prefix;
-		int pfxlen;
-	} ref_kind[] = {
-		{ REF_LOCAL_BRANCH, "refs/heads/", 11 },
-		{ REF_REMOTE_BRANCH, "refs/remotes/", 13 },
-	};
-
-	/* Detect kind */
-	for (i = 0; i < ARRAY_SIZE(ref_kind); i++) {
-		prefix = ref_kind[i].prefix;
-		if (strncmp(refname, prefix, ref_kind[i].pfxlen))
-			continue;
-		kind = ref_kind[i].kind;
-		refname += ref_kind[i].pfxlen;
-		break;
-	}
-	if (ARRAY_SIZE(ref_kind) <= i)
-		return 0;
-
-	/* Don't add types the caller doesn't want */
-	if ((kind & ref_list->kinds) == 0)
-		return 0;
-
-	commit = NULL;
-	if (ref_list->verbose || ref_list->with_commit || merge_filter != NO_FILTER) {
-		commit = lookup_commit_reference_gently(sha1, 1);
-		if (!commit) {
-			cb->ret = error("branch '%s' does not point at a commit", refname);
-			return 0;
+	static struct strbuf buf = STRBUF_INIT;
+
+	strbuf_reset(&buf);
+	while (*s) {
+		const char *ep = strchrnul(s, '%');
+		if (s < ep)
+			strbuf_add(&buf, s, ep - s);
+		if (*ep == '%') {
+			strbuf_addstr(&buf, "%%");
+			s = ep + 1;
+		} else {
+			s = ep;
 		}
-
-		/* Filter with with_commit if specified */
-		if (!is_descendant_of(commit, ref_list->with_commit))
-			return 0;
-
-		if (merge_filter != NO_FILTER)
-			add_pending_object(&ref_list->revs,
-					   (struct object *)commit, refname);
 	}
-
-	ALLOC_GROW(ref_list->list, ref_list->index + 1, ref_list->alloc);
-
-	/* Record the new item */
-	newitem = &(ref_list->list[ref_list->index++]);
-	newitem->name = xstrdup(refname);
-	newitem->kind = kind;
-	newitem->commit = commit;
-	newitem->len = strlen(refname);
-	newitem->dest = resolve_symref(orig_refname, prefix);
-	/* adjust for "remotes/" */
-	if (newitem->kind == REF_REMOTE_BRANCH &&
-	    ref_list->kinds != REF_REMOTE_BRANCH)
-		newitem->len += 8;
-	if (newitem->len > ref_list->maxwidth)
-		ref_list->maxwidth = newitem->len;
-
-	return 0;
+	return buf.buf;
 }
 
-static void free_ref_list(struct ref_list *ref_list)
+static char *build_format(struct ref_filter *filter, int maxwidth, const char *remote_prefix)
 {
-	int i;
+	struct strbuf fmt = STRBUF_INIT;
+	struct strbuf local = STRBUF_INIT;
+	struct strbuf remote = STRBUF_INIT;
+
+	strbuf_addf(&local, "%%(if)%%(HEAD)%%(then)* %s%%(else)  %s%%(end)",
+		    branch_get_color(BRANCH_COLOR_CURRENT),
+		    branch_get_color(BRANCH_COLOR_LOCAL));
+	strbuf_addf(&remote, "  %s",
+		    branch_get_color(BRANCH_COLOR_REMOTE));
+
+	if (filter->verbose) {
+		struct strbuf obname = STRBUF_INIT;
+
+		if (filter->abbrev < 0)
+			strbuf_addf(&obname, "%%(objectname:short)");
+		else if (!filter->abbrev)
+			strbuf_addf(&obname, "%%(objectname)");
+		else
+			strbuf_addf(&obname, "%%(objectname:short=%d)", filter->abbrev);
+
+		strbuf_addf(&local, "%%(align:%d,left)%%(refname:lstrip=2)%%(end)", maxwidth);
+		strbuf_addstr(&local, branch_get_color(BRANCH_COLOR_RESET));
+		strbuf_addf(&local, " %s ", obname.buf);
 
-	for (i = 0; i < ref_list->index; i++) {
-		free(ref_list->list[i].name);
-		free(ref_list->list[i].dest);
+		if (filter->verbose > 1)
+			strbuf_addf(&local, "%%(if)%%(upstream)%%(then)[%s%%(upstream:short)%s%%(if)%%(upstream:track)"
+				    "%%(then): %%(upstream:track,nobracket)%%(end)] %%(end)%%(contents:subject)",
+				    branch_get_color(BRANCH_COLOR_UPSTREAM), branch_get_color(BRANCH_COLOR_RESET));
+		else
+			strbuf_addf(&local, "%%(if)%%(upstream:track)%%(then)%%(upstream:track) %%(end)%%(contents:subject)");
+
+		strbuf_addf(&remote, "%%(align:%d,left)%s%%(refname:lstrip=2)%%(end)%s"
+			    "%%(if)%%(symref)%%(then) -> %%(symref:short)"
+			    "%%(else) %s %%(contents:subject)%%(end)",
+			    maxwidth, quote_literal_for_format(remote_prefix),
+			    branch_get_color(BRANCH_COLOR_RESET), obname.buf);
+		strbuf_release(&obname);
+	} else {
+		strbuf_addf(&local, "%%(refname:lstrip=2)%s%%(if)%%(symref)%%(then) -> %%(symref:short)%%(end)",
+			    branch_get_color(BRANCH_COLOR_RESET));
+		strbuf_addf(&remote, "%s%%(refname:lstrip=2)%s%%(if)%%(symref)%%(then) -> %%(symref:short)%%(end)",
+			    quote_literal_for_format(remote_prefix),
+			    branch_get_color(BRANCH_COLOR_RESET));
 	}
-	free(ref_list->list);
-}
 
-static int ref_cmp(const void *r1, const void *r2)
-{
-	struct ref_item *c1 = (struct ref_item *)(r1);
-	struct ref_item *c2 = (struct ref_item *)(r2);
+	strbuf_addf(&fmt, "%%(if:notequals=refs/remotes)%%(refname:rstrip=-2)%%(then)%s%%(else)%s%%(end)", local.buf, remote.buf);
 
-	if (c1->kind != c2->kind)
-		return c1->kind - c2->kind;
-	return strcmp(c1->name, c2->name);
+	strbuf_release(&local);
+	strbuf_release(&remote);
+	return strbuf_detach(&fmt, NULL);
 }
 
-static void fill_tracking_info(struct strbuf *stat, const char *branch_name,
-		int show_upstream_ref)
+static void print_ref_list(struct ref_filter *filter, struct ref_sorting *sorting, struct ref_format *format)
 {
-	int ours, theirs;
-	struct branch *branch = branch_get(branch_name);
-
-	if (!stat_tracking_info(branch, &ours, &theirs)) {
-		if (branch && branch->merge && branch->merge[0]->dst &&
-		    show_upstream_ref)
-			strbuf_addf(stat, "[%s] ",
-			    shorten_unambiguous_ref(branch->merge[0]->dst, 0));
-		return;
-	}
-
-	strbuf_addch(stat, '[');
-	if (show_upstream_ref)
-		strbuf_addf(stat, "%s: ",
-			shorten_unambiguous_ref(branch->merge[0]->dst, 0));
-	if (!ours)
-		strbuf_addf(stat, "behind %d] ", theirs);
-	else if (!theirs)
-		strbuf_addf(stat, "ahead %d] ", ours);
-	else
-		strbuf_addf(stat, "ahead %d, behind %d] ", ours, theirs);
-}
+	int i;
+	struct ref_array array;
+	int maxwidth = 0;
+	const char *remote_prefix = "";
+	struct strbuf out = STRBUF_INIT;
+	char *to_free = NULL;
 
-static int matches_merge_filter(struct commit *commit)
-{
-	int is_merged;
+	/*
+	 * If we are listing more than just remote branches,
+	 * then remote branches will have a "remotes/" prefix.
+	 * We need to account for this in the width.
+	 */
+	if (filter->kind != FILTER_REFS_REMOTES)
+		remote_prefix = "remotes/";
 
-	if (merge_filter == NO_FILTER)
-		return 1;
+	memset(&array, 0, sizeof(array));
 
-	is_merged = !!(commit->object.flags & UNINTERESTING);
-	return (is_merged == (merge_filter == SHOW_MERGED));
-}
+	filter_refs(&array, filter, filter->kind | FILTER_REFS_INCLUDE_BROKEN);
 
-static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
-			   int abbrev, int current, char *prefix)
-{
-	char c;
-	int color;
-	struct commit *commit = item->commit;
-	struct strbuf out = STRBUF_INIT, name = STRBUF_INIT;
+	if (filter->verbose)
+		maxwidth = calc_maxwidth(&array, strlen(remote_prefix));
 
-	if (!matches_merge_filter(commit))
-		return;
+	if (!format->format)
+		format->format = to_free = build_format(filter, maxwidth, remote_prefix);
+	format->use_color = branch_use_color;
 
-	switch (item->kind) {
-	case REF_LOCAL_BRANCH:
-		color = BRANCH_COLOR_LOCAL;
-		break;
-	case REF_REMOTE_BRANCH:
-		color = BRANCH_COLOR_REMOTE;
-		break;
-	default:
-		color = BRANCH_COLOR_PLAIN;
-		break;
-	}
+	if (verify_ref_format(format))
+		die(_("unable to parse format string"));
 
-	c = ' ';
-	if (current) {
-		c = '*';
-		color = BRANCH_COLOR_CURRENT;
-	}
+	ref_array_sort(sorting, &array);
 
-	strbuf_addf(&name, "%s%s", prefix, item->name);
-	if (verbose)
-		strbuf_addf(&out, "%c %s%-*s%s", c, branch_get_color(color),
-			    maxwidth, name.buf,
-			    branch_get_color(BRANCH_COLOR_RESET));
-	else
-		strbuf_addf(&out, "%c %s%s%s", c, branch_get_color(color),
-			    name.buf, branch_get_color(BRANCH_COLOR_RESET));
-
-	if (item->dest)
-		strbuf_addf(&out, " -> %s", item->dest);
-	else if (verbose) {
-		struct strbuf subject = STRBUF_INIT, stat = STRBUF_INIT;
-		const char *sub = " **** invalid ref ****";
-
-		commit = item->commit;
-		if (commit && !parse_commit(commit)) {
-			struct pretty_print_context ctx = {0};
-			pretty_print_commit(CMIT_FMT_ONELINE, commit,
-					    &subject, &ctx);
-			sub = subject.buf;
+	for (i = 0; i < array.nr; i++) {
+		format_ref_array_item(array.items[i], format, &out);
+		if (column_active(colopts)) {
+			assert(!filter->verbose && "--column and --verbose are incompatible");
+			 /* format to a string_list to let print_columns() do its job */
+			string_list_append(&output, out.buf);
+		} else {
+			fwrite(out.buf, 1, out.len, stdout);
+			putchar('\n');
 		}
-
-		if (item->kind == REF_LOCAL_BRANCH)
-			fill_tracking_info(&stat, item->name, verbose > 1);
-
-		strbuf_addf(&out, " %s %s%s",
-			find_unique_abbrev(item->commit->object.sha1, abbrev),
-			stat.buf, sub);
-		strbuf_release(&stat);
-		strbuf_release(&subject);
+		strbuf_release(&out);
 	}
-	printf("%s\n", out.buf);
-	strbuf_release(&name);
-	strbuf_release(&out);
-}
 
-static int calc_maxwidth(struct ref_list *refs)
-{
-	int i, w = 0;
-	for (i = 0; i < refs->index; i++) {
-		if (!matches_merge_filter(refs->list[i].commit))
-			continue;
-		if (refs->list[i].len > w)
-			w = refs->list[i].len;
-	}
-	return w;
+	ref_array_clear(&array);
+	free(to_free);
 }
 
-
-static void show_detached(struct ref_list *ref_list)
-{
-	struct commit *head_commit = lookup_commit_reference_gently(head_sha1, 1);
-
-	if (head_commit && is_descendant_of(head_commit, ref_list->with_commit)) {
-		struct ref_item item;
-		item.name = xstrdup("(no branch)");
-		item.len = strlen(item.name);
-		item.kind = REF_LOCAL_BRANCH;
-		item.dest = NULL;
-		item.commit = head_commit;
-		if (item.len > ref_list->maxwidth)
-			ref_list->maxwidth = item.len;
-		print_ref_item(&item, ref_list->maxwidth, ref_list->verbose, ref_list->abbrev, 1, "");
-		free(item.name);
-	}
-}
-
-static int print_ref_list(int kinds, int detached, int verbose, int abbrev, struct commit_list *with_commit)
+static void reject_rebase_or_bisect_branch(const char *target)
 {
+	struct worktree **worktrees = get_worktrees(0);
 	int i;
-	struct append_ref_cb cb;
-	struct ref_list ref_list;
-
-	memset(&ref_list, 0, sizeof(ref_list));
-	ref_list.kinds = kinds;
-	ref_list.verbose = verbose;
-	ref_list.abbrev = abbrev;
-	ref_list.with_commit = with_commit;
-	if (merge_filter != NO_FILTER)
-		init_revisions(&ref_list.revs, NULL);
-	cb.ref_list = &ref_list;
-	cb.ret = 0;
-	for_each_rawref(append_ref, &cb);
-	if (merge_filter != NO_FILTER) {
-		struct commit *filter;
-		filter = lookup_commit_reference_gently(merge_filter_ref, 0);
-		filter->object.flags |= UNINTERESTING;
-		add_pending_object(&ref_list.revs,
-				   (struct object *) filter, "");
-		ref_list.revs.limited = 1;
-		prepare_revision_walk(&ref_list.revs);
-		if (verbose)
-			ref_list.maxwidth = calc_maxwidth(&ref_list);
-	}
 
-	qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
-
-	detached = (detached && (kinds & REF_LOCAL_BRANCH));
-	if (detached)
-		show_detached(&ref_list);
-
-	for (i = 0; i < ref_list.index; i++) {
-		int current = !detached &&
-			(ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
-			!strcmp(ref_list.list[i].name, head);
-		char *prefix = (kinds != REF_REMOTE_BRANCH &&
-				ref_list.list[i].kind == REF_REMOTE_BRANCH)
-				? "remotes/" : "";
-		print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
-			       abbrev, current, prefix);
-	}
+	for (i = 0; worktrees[i]; i++) {
+		struct worktree *wt = worktrees[i];
 
-	free_ref_list(&ref_list);
+		if (!wt->is_detached)
+			continue;
+
+		if (is_worktree_being_rebased(wt, target))
+			die(_("Branch %s is being rebased at %s"),
+			    target, wt->path);
 
-	if (cb.ret)
-		error("some refs could not be read");
+		if (is_worktree_being_bisected(wt, target))
+			die(_("Branch %s is being bisected at %s"),
+			    target, wt->path);
+	}
 
-	return cb.ret;
+	free_worktrees(worktrees);
 }
 
-static void rename_branch(const char *oldname, const char *newname, int force)
+static void copy_or_rename_branch(const char *oldname, const char *newname, int copy, int force)
 {
 	struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT;
-	unsigned char sha1[20];
 	struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT;
 	int recovery = 0;
+	int clobber_head_ok;
 
-	if (!oldname)
-		die("cannot rename the current branch while not on any.");
+	if (!oldname) {
+		if (copy)
+			die(_("cannot copy the current branch while not on any."));
+		else
+			die(_("cannot rename the current branch while not on any."));
+	}
 
 	if (strbuf_check_branch_ref(&oldref, oldname)) {
 		/*
 		 * Bad name --- this could be an attempt to rename a
 		 * ref that we used to allow to be created by accident.
 		 */
-		if (resolve_ref(oldref.buf, sha1, 1, NULL))
+		if (ref_exists(oldref.buf))
 			recovery = 1;
 		else
-			die("Invalid branch name: '%s'", oldname);
+			die(_("Invalid branch name: '%s'"), oldname);
 	}
 
-	if (strbuf_check_branch_ref(&newref, newname))
-		die("Invalid branch name: '%s'", newname);
+	/*
+	 * A command like "git branch -M currentbranch currentbranch" cannot
+	 * cause the worktree to become inconsistent with HEAD, so allow it.
+	 */
+	clobber_head_ok = !strcmp(oldname, newname);
 
-	if (resolve_ref(newref.buf, sha1, 1, NULL) && !force)
-		die("A branch named '%s' already exists.", newref.buf + 11);
+	validate_new_branchname(newname, &newref, force, clobber_head_ok);
 
-	strbuf_addf(&logmsg, "Branch: renamed %s to %s",
-		 oldref.buf, newref.buf);
+	reject_rebase_or_bisect_branch(oldref.buf);
 
-	if (rename_ref(oldref.buf, newref.buf, logmsg.buf))
-		die("Branch rename failed");
-	strbuf_release(&logmsg);
+	if (copy)
+		strbuf_addf(&logmsg, "Branch: copied %s to %s",
+			    oldref.buf, newref.buf);
+	else
+		strbuf_addf(&logmsg, "Branch: renamed %s to %s",
+			    oldref.buf, newref.buf);
+
+	if (!copy && rename_ref(oldref.buf, newref.buf, logmsg.buf))
+		die(_("Branch rename failed"));
+	if (copy && copy_existing_ref(oldref.buf, newref.buf, logmsg.buf))
+		die(_("Branch copy failed"));
+
+	if (recovery) {
+		if (copy)
+			warning(_("Copied a misnamed branch '%s' away"),
+				oldref.buf + 11);
+		else
+			warning(_("Renamed a misnamed branch '%s' away"),
+				oldref.buf + 11);
+	}
 
-	if (recovery)
-		warning("Renamed a misnamed branch '%s' away", oldref.buf + 11);
+	if (!copy &&
+	    replace_each_worktree_head_symref(oldref.buf, newref.buf, logmsg.buf))
+		die(_("Branch renamed to %s, but HEAD is not updated!"), newname);
 
-	/* no need to pass logmsg here as HEAD didn't really move */
-	if (!strcmp(oldname, head) && create_symref("HEAD", newref.buf, NULL))
-		die("Branch renamed to %s, but HEAD is not updated!", newname);
+	strbuf_release(&logmsg);
 
 	strbuf_addf(&oldsection, "branch.%s", oldref.buf + 11);
 	strbuf_release(&oldref);
 	strbuf_addf(&newsection, "branch.%s", newref.buf + 11);
 	strbuf_release(&newref);
-	if (git_config_rename_section(oldsection.buf, newsection.buf) < 0)
-		die("Branch is renamed, but update of config-file failed");
+	if (!copy && git_config_rename_section(oldsection.buf, newsection.buf) < 0)
+		die(_("Branch is renamed, but update of config-file failed"));
+	if (copy && strcmp(oldname, newname) && git_config_copy_section(oldsection.buf, newsection.buf) < 0)
+		die(_("Branch is copied, but update of config-file failed"));
 	strbuf_release(&oldsection);
 	strbuf_release(&newsection);
 }
 
-static int opt_parse_merge_filter(const struct option *opt, const char *arg, int unset)
+static GIT_PATH_FUNC(edit_description, "EDIT_DESCRIPTION")
+
+static int edit_branch_description(const char *branch_name)
 {
-	merge_filter = ((opt->long_name[0] == 'n')
-			? SHOW_NOT_MERGED
-			: SHOW_MERGED);
-	if (unset)
-		merge_filter = SHOW_NOT_MERGED; /* b/c for --no-merged */
-	if (!arg)
-		arg = "HEAD";
-	if (get_sha1(arg, merge_filter_ref))
-		die("malformed object name %s", arg);
+	struct strbuf buf = STRBUF_INIT;
+	struct strbuf name = STRBUF_INIT;
+
+	read_branch_desc(&buf, branch_name);
+	if (!buf.len || buf.buf[buf.len-1] != '\n')
+		strbuf_addch(&buf, '\n');
+	strbuf_commented_addf(&buf,
+		    _("Please edit the description for the branch\n"
+		      "  %s\n"
+		      "Lines starting with '%c' will be stripped.\n"),
+		    branch_name, comment_line_char);
+	write_file_buf(edit_description(), buf.buf, buf.len);
+	strbuf_reset(&buf);
+	if (launch_editor(edit_description(), &buf, NULL)) {
+		strbuf_release(&buf);
+		return -1;
+	}
+	strbuf_stripspace(&buf, 1);
+
+	strbuf_addf(&name, "branch.%s.description", branch_name);
+	git_config_set(name.buf, buf.len ? buf.buf : NULL);
+	strbuf_release(&name);
+	strbuf_release(&buf);
+
 	return 0;
 }
 
 int cmd_branch(int argc, const char **argv, const char *prefix)
 {
-	int delete = 0, rename = 0, force_create = 0;
-	int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
-	int reflog = 0;
+	int delete = 0, rename = 0, copy = 0, force = 0, list = 0;
+	int reflog = 0, edit_description = 0;
+	int quiet = 0, unset_upstream = 0;
+	const char *new_upstream = NULL;
 	enum branch_track track;
-	int kinds = REF_LOCAL_BRANCH;
-	struct commit_list *with_commit = NULL;
+	struct ref_filter filter;
+	int icase = 0;
+	static struct ref_sorting *sorting = NULL, **sorting_tail = &sorting;
+	struct ref_format format = REF_FORMAT_INIT;
 
 	struct option options[] = {
-		OPT_GROUP("Generic options"),
-		OPT__VERBOSE(&verbose,
-			"show hash and subject, give twice for upstream branch"),
-		OPT_SET_INT('t', "track",  &track, "set up tracking mode (see git-pull(1))",
+		OPT_GROUP(N_("Generic options")),
+		OPT__VERBOSE(&filter.verbose,
+			N_("show hash and subject, give twice for upstream branch")),
+		OPT__QUIET(&quiet, N_("suppress informational messages")),
+		OPT_SET_INT('t', "track",  &track, N_("set up tracking mode (see git-pull(1))"),
 			BRANCH_TRACK_EXPLICIT),
-		OPT_SET_INT( 0, "set-upstream",  &track, "change upstream info",
-			BRANCH_TRACK_OVERRIDE),
-		OPT__COLOR(&branch_use_color, "use colored output"),
-		OPT_SET_INT('r', NULL,     &kinds, "act on remote-tracking branches",
-			REF_REMOTE_BRANCH),
+		{ OPTION_SET_INT, 0, "set-upstream", &track, NULL, N_("do not use"),
+			PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, BRANCH_TRACK_OVERRIDE },
+		OPT_STRING('u', "set-upstream-to", &new_upstream, N_("upstream"), N_("change the upstream info")),
+		OPT_BOOL(0, "unset-upstream", &unset_upstream, N_("Unset the upstream info")),
+		OPT__COLOR(&branch_use_color, N_("use colored output")),
+		OPT_SET_INT('r', "remotes",     &filter.kind, N_("act on remote-tracking branches"),
+			FILTER_REFS_REMOTES),
+		OPT_CONTAINS(&filter.with_commit, N_("print only branches that contain the commit")),
+		OPT_NO_CONTAINS(&filter.no_commit, N_("print only branches that don't contain the commit")),
+		OPT_WITH(&filter.with_commit, N_("print only branches that contain the commit")),
+		OPT_WITHOUT(&filter.no_commit, N_("print only branches that don't contain the commit")),
+		OPT__ABBREV(&filter.abbrev),
+
+		OPT_GROUP(N_("Specific git-branch actions:")),
+		OPT_SET_INT('a', "all", &filter.kind, N_("list both remote-tracking and local branches"),
+			FILTER_REFS_REMOTES | FILTER_REFS_BRANCHES),
+		OPT_BIT('d', "delete", &delete, N_("delete fully merged branch"), 1),
+		OPT_BIT('D', NULL, &delete, N_("delete branch (even if not merged)"), 2),
+		OPT_BIT('m', "move", &rename, N_("move/rename a branch and its reflog"), 1),
+		OPT_BIT('M', NULL, &rename, N_("move/rename a branch, even if target exists"), 2),
+		OPT_BIT('c', "copy", &copy, N_("copy a branch and its reflog"), 1),
+		OPT_BIT('C', NULL, &copy, N_("copy a branch, even if target exists"), 2),
+		OPT_BOOL(0, "list", &list, N_("list branch names")),
+		OPT_BOOL('l', "create-reflog", &reflog, N_("create the branch's reflog")),
+		OPT_BOOL(0, "edit-description", &edit_description,
+			 N_("edit the description for the branch")),
+		OPT__FORCE(&force, N_("force creation, move/rename, deletion")),
+		OPT_MERGED(&filter, N_("print only branches that are merged")),
+		OPT_NO_MERGED(&filter, N_("print only branches that are not merged")),
+		OPT_COLUMN(0, "column", &colopts, N_("list branches in columns")),
+		OPT_CALLBACK(0 , "sort", sorting_tail, N_("key"),
+			     N_("field name to sort on"), &parse_opt_ref_sorting),
 		{
-			OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
-			"print only branches that contain the commit",
-			PARSE_OPT_LASTARG_DEFAULT,
-			parse_opt_with_commit, (intptr_t)"HEAD",
-		},
-		{
-			OPTION_CALLBACK, 0, "with", &with_commit, "commit",
-			"print only branches that contain the commit",
-			PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
-			parse_opt_with_commit, (intptr_t) "HEAD",
-		},
-		OPT__ABBREV(&abbrev),
-
-		OPT_GROUP("Specific git-branch actions:"),
-		OPT_SET_INT('a', NULL, &kinds, "list both remote-tracking and local branches",
-			REF_REMOTE_BRANCH | REF_LOCAL_BRANCH),
-		OPT_BIT('d', NULL, &delete, "delete fully merged branch", 1),
-		OPT_BIT('D', NULL, &delete, "delete branch (even if not merged)", 2),
-		OPT_BIT('m', NULL, &rename, "move/rename a branch and its reflog", 1),
-		OPT_BIT('M', NULL, &rename, "move/rename a branch, even if target exists", 2),
-		OPT_BOOLEAN('l', NULL, &reflog, "create the branch's reflog"),
-		OPT__FORCE(&force_create, "force creation (when already exists)"),
-		{
-			OPTION_CALLBACK, 0, "no-merged", &merge_filter_ref,
-			"commit", "print only not merged branches",
-			PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
-			opt_parse_merge_filter, (intptr_t) "HEAD",
-		},
-		{
-			OPTION_CALLBACK, 0, "merged", &merge_filter_ref,
-			"commit", "print only merged branches",
-			PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
-			opt_parse_merge_filter, (intptr_t) "HEAD",
+			OPTION_CALLBACK, 0, "points-at", &filter.points_at, N_("object"),
+			N_("print only branches of the object"), 0, parse_opt_object_name
 		},
+		OPT_BOOL('i', "ignore-case", &icase, N_("sorting and filtering are case insensitive")),
+		OPT_STRING(  0 , "format", &format.format, N_("format"), N_("format to use for the output")),
 		OPT_END(),
 	};
 
+	setup_ref_filter_porcelain_msg();
+
+	memset(&filter, 0, sizeof(filter));
+	filter.kind = FILTER_REFS_BRANCHES;
+	filter.abbrev = -1;
+
 	if (argc == 2 && !strcmp(argv[1], "-h"))
 		usage_with_options(builtin_branch_usage, options);
 
 	git_config(git_branch_config, NULL);
 
-	if (branch_use_color == -1)
-		branch_use_color = git_use_color_default;
-
 	track = git_branch_track;
 
-	head = resolve_ref("HEAD", head_sha1, 0, NULL);
+	head = resolve_refdup("HEAD", 0, head_oid.hash, NULL);
 	if (!head)
-		die("Failed to resolve HEAD as a valid ref.");
-	head = xstrdup(head);
-	if (!strcmp(head, "HEAD")) {
-		detached = 1;
-	} else {
-		if (prefixcmp(head, "refs/heads/"))
-			die("HEAD not found below refs/heads!");
-		head += 11;
-	}
-	hashcpy(merge_filter_ref, head_sha1);
+		die(_("Failed to resolve HEAD as a valid ref."));
+	if (!strcmp(head, "HEAD"))
+		filter.detached = 1;
+	else if (!skip_prefix(head, "refs/heads/", &head))
+		die(_("HEAD not found below refs/heads!"));
 
 	argc = parse_options(argc, argv, prefix, options, builtin_branch_usage,
 			     0);
-	if (!!delete + !!rename + !!force_create > 1)
+
+	if (!delete && !rename && !copy && !edit_description && !new_upstream && !unset_upstream && argc == 0)
+		list = 1;
+
+	if (filter.with_commit || filter.merge != REF_FILTER_MERGED_NONE || filter.points_at.nr ||
+	    filter.no_commit)
+		list = 1;
+
+	if (!!delete + !!rename + !!copy + !!new_upstream +
+	    list + unset_upstream > 1)
 		usage_with_options(builtin_branch_usage, options);
 
-	if (delete)
-		return delete_branches(argc, argv, delete > 1, kinds);
-	else if (argc == 0)
-		return print_ref_list(kinds, detached, verbose, abbrev, with_commit);
-	else if (rename && (argc == 1))
-		rename_branch(head, argv[0], rename > 1);
-	else if (rename && (argc == 2))
-		rename_branch(argv[0], argv[1], rename > 1);
-	else if (argc <= 2) {
-		if (kinds != REF_LOCAL_BRANCH)
-			die("-a and -r options to 'git branch' do not make sense with a branch name");
-		create_branch(head, argv[0], (argc == 2) ? argv[1] : head,
-			      force_create, reflog, track);
+	if (filter.abbrev == -1)
+		filter.abbrev = DEFAULT_ABBREV;
+	filter.ignore_case = icase;
+
+	finalize_colopts(&colopts, -1);
+	if (filter.verbose) {
+		if (explicitly_enable_column(colopts))
+			die(_("--column and --verbose are incompatible"));
+		colopts = 0;
+	}
+
+	if (force) {
+		delete *= 2;
+		rename *= 2;
+		copy *= 2;
+	}
+
+	if (delete) {
+		if (!argc)
+			die(_("branch name required"));
+		return delete_branches(argc, argv, delete > 1, filter.kind, quiet);
+	} else if (list) {
+		/*  git branch --local also shows HEAD when it is detached */
+		if ((filter.kind & FILTER_REFS_BRANCHES) && filter.detached)
+			filter.kind |= FILTER_REFS_DETACHED_HEAD;
+		filter.name_patterns = argv;
+		/*
+		 * If no sorting parameter is given then we default to sorting
+		 * by 'refname'. This would give us an alphabetically sorted
+		 * array with the 'HEAD' ref at the beginning followed by
+		 * local branches 'refs/heads/...' and finally remote-tacking
+		 * branches 'refs/remotes/...'.
+		 */
+		if (!sorting)
+			sorting = ref_default_sorting();
+		sorting->ignore_case = icase;
+		print_ref_list(&filter, sorting, &format);
+		print_columns(&output, colopts, NULL);
+		string_list_clear(&output, 0);
+		return 0;
+	}
+	else if (edit_description) {
+		const char *branch_name;
+		struct strbuf branch_ref = STRBUF_INIT;
+
+		if (!argc) {
+			if (filter.detached)
+				die(_("Cannot give description to detached HEAD"));
+			branch_name = head;
+		} else if (argc == 1)
+			branch_name = argv[0];
+		else
+			die(_("cannot edit description of more than one branch"));
+
+		strbuf_addf(&branch_ref, "refs/heads/%s", branch_name);
+		if (!ref_exists(branch_ref.buf)) {
+			strbuf_release(&branch_ref);
+
+			if (!argc)
+				return error(_("No commit on branch '%s' yet."),
+					     branch_name);
+			else
+				return error(_("No branch named '%s'."),
+					     branch_name);
+		}
+		strbuf_release(&branch_ref);
+
+		if (edit_branch_description(branch_name))
+			return 1;
+	} else if (copy) {
+		if (!argc)
+			die(_("branch name required"));
+		else if (argc == 1)
+			copy_or_rename_branch(head, argv[0], 1, copy > 1);
+		else if (argc == 2)
+			copy_or_rename_branch(argv[0], argv[1], 1, copy > 1);
+		else
+			die(_("too many branches for a copy operation"));
+	} else if (rename) {
+		if (!argc)
+			die(_("branch name required"));
+		else if (argc == 1)
+			copy_or_rename_branch(head, argv[0], 0, rename > 1);
+		else if (argc == 2)
+			copy_or_rename_branch(argv[0], argv[1], 0, rename > 1);
+		else
+			die(_("too many arguments for a rename operation"));
+	} else if (new_upstream) {
+		struct branch *branch = branch_get(argv[0]);
+
+		if (argc > 1)
+			die(_("too many arguments to set new upstream"));
+
+		if (!branch) {
+			if (!argc || !strcmp(argv[0], "HEAD"))
+				die(_("could not set upstream of HEAD to %s when "
+				      "it does not point to any branch."),
+				    new_upstream);
+			die(_("no such branch '%s'"), argv[0]);
+		}
+
+		if (!ref_exists(branch->refname))
+			die(_("branch '%s' does not exist"), branch->name);
+
+		/*
+		 * create_branch takes care of setting up the tracking
+		 * info and making sure new_upstream is correct
+		 */
+		create_branch(branch->name, new_upstream, 0, 0, 0, quiet, BRANCH_TRACK_OVERRIDE);
+	} else if (unset_upstream) {
+		struct branch *branch = branch_get(argv[0]);
+		struct strbuf buf = STRBUF_INIT;
+
+		if (argc > 1)
+			die(_("too many arguments to unset upstream"));
+
+		if (!branch) {
+			if (!argc || !strcmp(argv[0], "HEAD"))
+				die(_("could not unset upstream of HEAD when "
+				      "it does not point to any branch."));
+			die(_("no such branch '%s'"), argv[0]);
+		}
+
+		if (!branch_has_merge_config(branch))
+			die(_("Branch '%s' has no upstream information"), branch->name);
+
+		strbuf_addf(&buf, "branch.%s.remote", branch->name);
+		git_config_set_multivar(buf.buf, NULL, NULL, 1);
+		strbuf_reset(&buf);
+		strbuf_addf(&buf, "branch.%s.merge", branch->name);
+		git_config_set_multivar(buf.buf, NULL, NULL, 1);
+		strbuf_release(&buf);
+	} else if (argc > 0 && argc <= 2) {
+		struct branch *branch = branch_get(argv[0]);
+
+		if (!strcmp(argv[0], "HEAD"))
+			die(_("it does not make sense to create 'HEAD' manually"));
+
+		if (!branch)
+			die(_("no such branch '%s'"), argv[0]);
+
+		if (filter.kind != FILTER_REFS_BRANCHES)
+			die(_("-a and -r options to 'git branch' do not make sense with a branch name"));
+
+		if (track == BRANCH_TRACK_OVERRIDE)
+			die(_("the '--set-upstream' option is no longer supported. Please use '--track' or '--set-upstream-to' instead."));
+
+		create_branch(argv[0], (argc == 2) ? argv[1] : head,
+			      force, reflog, 0, quiet, track);
+
 	} else
 		usage_with_options(builtin_branch_usage, options);