Imported Upstream version 2.5.0
[platform/upstream/git.git] / builtin / branch.c
index ffd2684..b42e5b6 100644 (file)
 #include "string-list.h"
 #include "column.h"
 #include "utf8.h"
+#include "wt-status.h"
 
 static const char * const builtin_branch_usage[] = {
-       N_("git branch [options] [-r | -a] [--merged | --no-merged]"),
-       N_("git branch [options] [-l] [-f] <branchname> [<start-point>]"),
-       N_("git branch [options] [-r] (-d | -D) <branchname>..."),
-       N_("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>"),
        NULL
 };
 
@@ -40,13 +41,15 @@ static char branch_colors[][COLOR_MAXLEN] = {
        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 {
@@ -59,37 +62,40 @@ 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)
 {
-       if (!prefixcmp(var, "column."))
+       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);
                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);
 }
@@ -117,14 +123,13 @@ static int branch_merged(int kind, const char *name,
 
        if (kind == REF_LOCAL_BRANCH) {
                struct branch *branch = branch_get(name);
+               const char *upstream = branch_get_upstream(branch, NULL);
                unsigned char sha1[20];
 
-               if (branch &&
-                   branch->merge &&
-                   branch->merge[0] &&
-                   branch->merge[0]->dst &&
+               if (upstream &&
                    (reference_name = reference_name_to_free =
-                    resolve_refdup(branch->merge[0]->dst, sha1, 1, NULL)) != NULL)
+                    resolve_refdup(upstream, RESOLVE_REF_READING,
+                                   sha1, NULL)) != NULL)
                        reference_rev = lookup_commit_reference(sha1);
        }
        if (!reference_rev)
@@ -154,10 +159,37 @@ static int branch_merged(int kind, const char *name,
        return merged;
 }
 
+static int check_branch_commit(const char *branchname, const char *refname,
+                              unsigned char *sha1, struct commit *head_rev,
+                              int kinds, int force)
+{
+       struct commit *rev = lookup_commit_reference(sha1);
+       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 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 *rev, *head_rev = NULL;
+       struct commit *head_rev = NULL;
        unsigned char sha1[20];
        char *name = NULL;
        const char *fmt;
@@ -187,6 +219,9 @@ static int delete_branches(int argc, const char **argv, int force, int kinds,
                        die(_("Couldn't look up commit object for HEAD"));
        }
        for (i = 0; i < argc; i++, strbuf_release(&bname)) {
+               const char *target;
+               int flags = 0;
+
                strbuf_branchname(&bname, argv[i]);
                if (kinds == REF_LOCAL_BRANCH && !strcmp(head, bname.buf)) {
                        error(_("Cannot delete the branch '%s' "
@@ -198,48 +233,44 @@ static int delete_branches(int argc, const char **argv, int force, int kinds,
                free(name);
 
                name = mkpathdup(fmt, bname.buf);
-               if (read_ref(name, sha1)) {
+               target = resolve_ref_unsafe(name,
+                                           RESOLVE_REF_READING
+                                           | RESOLVE_REF_NO_RECURSE
+                                           | RESOLVE_REF_ALLOW_BAD_NAME,
+                                           sha1, &flags);
+               if (!target) {
                        error(remote_branch
-                             ? _("remote branch '%s' not found.")
+                             ? _("remote-tracking branch '%s' not found.")
                              : _("branch '%s' not found."), bname.buf);
                        ret = 1;
                        continue;
                }
 
-               rev = lookup_commit_reference(sha1);
-               if (!rev) {
-                       error(_("Couldn't look up commit object for '%s'"), name);
-                       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, sha1, head_rev, kinds,
+                                       force)) {
                        ret = 1;
                        continue;
                }
 
-               if (delete_ref(name, sha1, 0)) {
+               if (delete_ref(name, sha1, REF_NODEREF)) {
                        error(remote_branch
-                             ? _("Error deleting remote branch '%s'")
+                             ? _("Error deleting remote-tracking branch '%s'")
                              : _("Error deleting branch '%s'"),
                              bname.buf);
                        ret = 1;
-               } else {
-                       struct strbuf buf = STRBUF_INIT;
-                       if (!quiet)
-                               printf(remote_branch
-                                      ? _("Deleted remote 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);
+                       continue;
+               }
+               if (!quiet) {
+                       printf(remote_branch
+                              ? _("Deleted remote-tracking branch %s (was %s).\n")
+                              : _("Deleted branch %s (was %s).\n"),
+                              bname.buf,
+                              (flags & REF_ISBROKEN) ? "broken"
+                              : (flags & REF_ISSYMREF) ? target
+                              : find_unique_abbrev(sha1, DEFAULT_ABBREV));
                }
+               delete_branch_config(bname.buf);
        }
 
        free(name);
@@ -252,6 +283,7 @@ struct ref_item {
        char *dest;
        unsigned int kind, width;
        struct commit *commit;
+       int ignore;
 };
 
 struct ref_list {
@@ -266,13 +298,13 @@ static char *resolve_symref(const char *src, const char *prefix)
 {
        unsigned char sha1[20];
        int flag;
-       const char *dst, *cp;
+       const char *dst;
 
-       dst = resolve_ref_unsafe(src, sha1, 0, &flag);
+       dst = resolve_ref_unsafe(src, 0, sha1, &flag);
        if (!(dst && (flag & REF_ISSYMREF)))
                return NULL;
-       if (prefix && (cp = skip_prefix(dst, prefix)))
-               dst = cp;
+       if (prefix)
+               skip_prefix(dst, prefix, &dst);
        return xstrdup(dst);
 }
 
@@ -287,14 +319,14 @@ static int match_patterns(const char **pattern, const char *refname)
        if (!*pattern)
                return 1; /* no pattern always matches */
        while (*pattern) {
-               if (!fnmatch(*pattern, refname, 0))
+               if (!wildmatch(*pattern, refname, 0, NULL))
                        return 1;
                pattern++;
        }
        return 0;
 }
 
-static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
+static int append_ref(const char *refname, const struct object_id *oid, int flags, void *cb_data)
 {
        struct append_ref_cb *cb = (struct append_ref_cb *)(cb_data);
        struct ref_list *ref_list = cb->ref_list;
@@ -306,20 +338,18 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
        static struct {
                int kind;
                const char *prefix;
-               int pfxlen;
        } ref_kind[] = {
-               { REF_LOCAL_BRANCH, "refs/heads/", 11 },
-               { REF_REMOTE_BRANCH, "refs/remotes/", 13 },
+               { REF_LOCAL_BRANCH, "refs/heads/" },
+               { REF_REMOTE_BRANCH, "refs/remotes/" },
        };
 
        /* 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 (skip_prefix(refname, prefix, &refname)) {
+                       kind = ref_kind[i].kind;
+                       break;
+               }
        }
        if (ARRAY_SIZE(ref_kind) <= i)
                return 0;
@@ -333,7 +363,7 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
 
        commit = NULL;
        if (ref_list->verbose || ref_list->with_commit || merge_filter != NO_FILTER) {
-               commit = lookup_commit_reference_gently(sha1, 1);
+               commit = lookup_commit_reference_gently(oid->hash, 1);
                if (!commit) {
                        cb->ret = error(_("branch '%s' does not point at a commit"), refname);
                        return 0;
@@ -357,6 +387,7 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
        newitem->commit = commit;
        newitem->width = utf8_strwidth(refname);
        newitem->dest = resolve_symref(orig_refname, prefix);
+       newitem->ignore = 0;
        /* adjust for "remotes/" */
        if (newitem->kind == REF_REMOTE_BRANCH &&
            ref_list->kinds != REF_REMOTE_BRANCH)
@@ -394,59 +425,70 @@ static void fill_tracking_info(struct strbuf *stat, const char *branch_name,
        int ours, theirs;
        char *ref = NULL;
        struct branch *branch = branch_get(branch_name);
+       const char *upstream;
+       struct strbuf fancy = STRBUF_INIT;
+       int upstream_is_gone = 0;
+       int added_decoration = 1;
+
+       if (stat_tracking_info(branch, &ours, &theirs, &upstream) < 0) {
+               if (!upstream)
+                       return;
+               upstream_is_gone = 1;
+       }
 
-       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;
+       if (show_upstream_ref) {
+               ref = shorten_unambiguous_ref(upstream, 0);
+               if (want_color(branch_use_color))
+                       strbuf_addf(&fancy, "%s%s%s",
+                                       branch_get_color(BRANCH_COLOR_UPSTREAM),
+                                       ref, branch_get_color(BRANCH_COLOR_RESET));
+               else
+                       strbuf_addstr(&fancy, ref);
        }
 
-       if (show_upstream_ref)
-               ref = shorten_unambiguous_ref(branch->merge[0]->dst, 0);
-       if (!ours) {
-               if (ref)
-                       strbuf_addf(stat, _("[%s: behind %d]"), ref, theirs);
+       if (upstream_is_gone) {
+               if (show_upstream_ref)
+                       strbuf_addf(stat, _("[%s: gone]"), fancy.buf);
+               else
+                       added_decoration = 0;
+       } else if (!ours && !theirs) {
+               if (show_upstream_ref)
+                       strbuf_addf(stat, _("[%s]"), fancy.buf);
+               else
+                       added_decoration = 0;
+       } else if (!ours) {
+               if (show_upstream_ref)
+                       strbuf_addf(stat, _("[%s: behind %d]"), fancy.buf, theirs);
                else
                        strbuf_addf(stat, _("[behind %d]"), theirs);
 
        } else if (!theirs) {
-               if (ref)
-                       strbuf_addf(stat, _("[%s: ahead %d]"), ref, ours);
+               if (show_upstream_ref)
+                       strbuf_addf(stat, _("[%s: ahead %d]"), fancy.buf, ours);
                else
                        strbuf_addf(stat, _("[ahead %d]"), ours);
        } else {
-               if (ref)
+               if (show_upstream_ref)
                        strbuf_addf(stat, _("[%s: ahead %d, behind %d]"),
-                                   ref, ours, theirs);
+                                   fancy.buf, ours, theirs);
                else
                        strbuf_addf(stat, _("[ahead %d, behind %d]"),
                                    ours, theirs);
        }
-       strbuf_addch(stat, ' ');
+       strbuf_release(&fancy);
+       if (added_decoration)
+               strbuf_addch(stat, ' ');
        free(ref);
 }
 
-static int matches_merge_filter(struct commit *commit)
-{
-       int is_merged;
-
-       if (merge_filter == NO_FILTER)
-               return 1;
-
-       is_merged = !!(commit->object.flags & UNINTERESTING);
-       return (is_merged == (merge_filter == SHOW_MERGED));
-}
-
 static void add_verbose_info(struct strbuf *out, struct ref_item *item,
                             int verbose, int abbrev)
 {
        struct strbuf subject = STRBUF_INIT, stat = STRBUF_INIT;
-       const char *sub = " **** invalid ref ****";
+       const char *sub = _(" **** invalid ref ****");
        struct commit *commit = item->commit;
 
-       if (commit && !parse_commit(commit)) {
+       if (!parse_commit(commit)) {
                pp_commit_easy(CMIT_FMT_ONELINE, commit, &subject);
                sub = subject.buf;
        }
@@ -466,10 +508,9 @@ static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
 {
        char c;
        int color;
-       struct commit *commit = item->commit;
        struct strbuf out = STRBUF_INIT, name = STRBUF_INIT;
 
-       if (!matches_merge_filter(commit))
+       if (item->ignore)
                return;
 
        switch (item->kind) {
@@ -519,7 +560,7 @@ 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))
+               if (refs->list[i].ignore)
                        continue;
                if (refs->list[i].width > w)
                        w = refs->list[i].width;
@@ -527,6 +568,36 @@ static int calc_maxwidth(struct ref_list *refs)
        return w;
 }
 
+static char *get_head_description(void)
+{
+       struct strbuf desc = STRBUF_INIT;
+       struct wt_status_state state;
+       memset(&state, 0, sizeof(state));
+       wt_status_get_state(&state, 1);
+       if (state.rebase_in_progress ||
+           state.rebase_interactive_in_progress)
+               strbuf_addf(&desc, _("(no branch, rebasing %s)"),
+                           state.branch);
+       else if (state.bisect_in_progress)
+               strbuf_addf(&desc, _("(no branch, bisect started on %s)"),
+                           state.branch);
+       else if (state.detached_from) {
+               /* TRANSLATORS: make sure these match _("HEAD detached at ")
+                  and _("HEAD detached from ") in wt-status.c */
+               if (state.detached_at)
+                       strbuf_addf(&desc, _("(HEAD detached at %s)"),
+                               state.detached_from);
+               else
+                       strbuf_addf(&desc, _("(HEAD detached from %s)"),
+                               state.detached_from);
+       }
+       else
+               strbuf_addstr(&desc, _("(no branch)"));
+       free(state.branch);
+       free(state.onto);
+       free(state.detached_from);
+       return strbuf_detach(&desc, NULL);
+}
 
 static void show_detached(struct ref_list *ref_list)
 {
@@ -534,11 +605,12 @@ static void show_detached(struct ref_list *ref_list)
 
        if (head_commit && is_descendant_of(head_commit, ref_list->with_commit)) {
                struct ref_item item;
-               item.name = xstrdup(_("(no branch)"));
+               item.name = get_head_description();
                item.width = utf8_strwidth(item.name);
                item.kind = REF_LOCAL_BRANCH;
                item.dest = NULL;
                item.commit = head_commit;
+               item.ignore = 0;
                if (item.width > ref_list->maxwidth)
                        ref_list->maxwidth = item.width;
                print_ref_item(&item, ref_list->maxwidth, ref_list->verbose, ref_list->abbrev, 1, "");
@@ -567,14 +639,30 @@ static int print_ref_list(int kinds, int detached, int verbose, int abbrev, stru
                struct commit *filter;
                filter = lookup_commit_reference_gently(merge_filter_ref, 0);
                if (!filter)
-                       die("object '%s' does not point to a commit",
+                       die(_("object '%s' does not point to a commit"),
                            sha1_to_hex(merge_filter_ref));
 
                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 (prepare_revision_walk(&ref_list.revs))
+                       die(_("revision walk setup failed"));
+
+               for (i = 0; i < ref_list.index; i++) {
+                       struct ref_item *item = &ref_list.list[i];
+                       struct commit *commit = item->commit;
+                       int is_merged = !!(commit->object.flags & UNINTERESTING);
+                       item->ignore = is_merged != (merge_filter == SHOW_MERGED);
+               }
+
+               for (i = 0; i < ref_list.index; i++) {
+                       struct ref_item *item = &ref_list.list[i];
+                       clear_commit_marks(item->commit, ALL_REV_FLAGS);
+               }
+               clear_commit_marks(filter, ALL_REV_FLAGS);
+
                if (verbose)
                        ref_list.maxwidth = calc_maxwidth(&ref_list);
        }
@@ -675,7 +763,6 @@ static const char edit_description[] = "BRANCH_DESCRIPTION";
 
 static int edit_branch_description(const char *branch_name)
 {
-       FILE *fp;
        int status;
        struct strbuf buf = STRBUF_INIT;
        struct strbuf name = STRBUF_INIT;
@@ -683,13 +770,12 @@ static int edit_branch_description(const char *branch_name)
        read_branch_desc(&buf, branch_name);
        if (!buf.len || buf.buf[buf.len-1] != '\n')
                strbuf_addch(&buf, '\n');
-       strbuf_addf(&buf,
-                   "# Please edit the description for the branch\n"
-                   "#   %s\n"
-                   "# Lines starting with '#' will be stripped.\n",
-                   branch_name);
-       fp = fopen(git_path(edit_description), "w");
-       if ((fwrite(buf.buf, 1, buf.len, fp) < buf.len) || fclose(fp)) {
+       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);
+       if (write_file(git_path(edit_description), 0, "%s", buf.buf)) {
                strbuf_release(&buf);
                return error(_("could not write branch description template: %s"),
                             strerror(errno));
@@ -702,7 +788,7 @@ static int edit_branch_description(const char *branch_name)
        stripspace(&buf, 1);
 
        strbuf_addf(&name, "branch.%s.description", branch_name);
-       status = git_config_set(name.buf, buf.buf);
+       status = git_config_set(name.buf, buf.len ? buf.buf : NULL);
        strbuf_release(&name);
        strbuf_release(&buf);
 
@@ -711,7 +797,7 @@ static int edit_branch_description(const char *branch_name)
 
 int cmd_branch(int argc, const char **argv, const char *prefix)
 {
-       int delete = 0, rename = 0, force_create = 0, list = 0;
+       int delete = 0, rename = 0, force = 0, list = 0;
        int verbose = 0, abbrev = -1, detached = 0;
        int reflog = 0, edit_description = 0;
        int quiet = 0, unset_upstream = 0;
@@ -730,7 +816,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                OPT_SET_INT( 0, "set-upstream",  &track, N_("change upstream info"),
                        BRANCH_TRACK_OVERRIDE),
                OPT_STRING('u', "set-upstream-to", &new_upstream, "upstream", "change the upstream info"),
-               OPT_BOOLEAN(0, "unset-upstream", &unset_upstream, "Unset the upstream info"),
+               OPT_BOOL(0, "unset-upstream", &unset_upstream, "Unset the upstream info"),
                OPT__COLOR(&branch_use_color, N_("use colored output")),
                OPT_SET_INT('r', "remotes",     &kinds, N_("act on remote-tracking branches"),
                        REF_REMOTE_BRANCH),
@@ -755,11 +841,11 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                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_BOOLEAN(0, "list", &list, N_("list branch names")),
-               OPT_BOOLEAN('l', "create-reflog", &reflog, N_("create the branch's reflog")),
-               OPT_BOOLEAN(0, "edit-description", &edit_description,
-                           N_("edit the description for the branch")),
-               OPT__FORCE(&force_create, N_("force creation (when already exists)")),
+               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")),
                {
                        OPTION_CALLBACK, 0, "no-merged", &merge_filter_ref,
                        N_("commit"), N_("print only not merged branches"),
@@ -783,16 +869,13 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 
        track = git_branch_track;
 
-       head = resolve_refdup("HEAD", head_sha1, 0, NULL);
+       head = resolve_refdup("HEAD", 0, head_sha1, NULL);
        if (!head)
                die(_("Failed to resolve HEAD as a valid ref."));
-       if (!strcmp(head, "HEAD")) {
+       if (!strcmp(head, "HEAD"))
                detached = 1;
-       } else {
-               if (prefixcmp(head, "refs/heads/"))
-                       die(_("HEAD not found below refs/heads!"));
-               head += 11;
-       }
+       else if (!skip_prefix(head, "refs/heads/", &head))
+               die(_("HEAD not found below refs/heads!"));
        hashcpy(merge_filter_ref, head_sha1);
 
 
@@ -802,7 +885,11 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
        if (!delete && !rename && !edit_description && !new_upstream && !unset_upstream && argc == 0)
                list = 1;
 
-       if (!!delete + !!rename + !!force_create + !!list + !!new_upstream + !!unset_upstream > 1)
+       if (with_commit || merge_filter != NO_FILTER)
+               list = 1;
+
+       if (!!delete + !!rename + !!new_upstream +
+           list + unset_upstream > 1)
                usage_with_options(builtin_branch_usage, options);
 
        if (abbrev == -1)
@@ -814,9 +901,16 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                colopts = 0;
        }
 
-       if (delete)
+       if (force) {
+               delete *= 2;
+               rename *= 2;
+       }
+
+       if (delete) {
+               if (!argc)
+                       die(_("branch name required"));
                return delete_branches(argc, argv, delete > 1, kinds, quiet);
-       else if (list) {
+       else if (list) {
                int ret = print_ref_list(kinds, detached, verbose, abbrev,
                                         with_commit, argv);
                print_columns(&output, colopts, NULL);
@@ -827,39 +921,53 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                const char *branch_name;
                struct strbuf branch_ref = STRBUF_INIT;
 
-               if (detached)
-                       die("Cannot give description to detached HEAD");
-               if (!argc)
+               if (!argc) {
+                       if (detached)
+                               die(_("Cannot give description to detached HEAD"));
                        branch_name = head;
-               else if (argc == 1)
+               else if (argc == 1)
                        branch_name = argv[0];
                else
-                       usage_with_options(builtin_branch_usage, options);
+                       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.",
+                               return error(_("No commit on branch '%s' yet."),
                                             branch_name);
                        else
-                               return error("No such branch '%s'.", branch_name);
+                               return error(_("No branch named '%s'."),
+                                            branch_name);
                }
                strbuf_release(&branch_ref);
 
                if (edit_branch_description(branch_name))
                        return 1;
        } else if (rename) {
-               if (argc == 1)
+               if (!argc)
+                       die(_("branch name required"));
+               else if (argc == 1)
                        rename_branch(head, argv[0], rename > 1);
                else if (argc == 2)
                        rename_branch(argv[0], argv[1], rename > 1);
                else
-                       usage_with_options(builtin_branch_usage, options);
+                       die(_("too many branches for a rename operation"));
        } else if (new_upstream) {
                struct branch *branch = branch_get(argv[0]);
 
+               if (argc > 1)
+                       die(_("too many branches 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);
 
@@ -872,10 +980,19 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                struct branch *branch = branch_get(argv[0]);
                struct strbuf buf = STRBUF_INIT;
 
-               if (!branch_has_merge_config(branch)) {
-                       die(_("Branch '%s' has no upstream information"), branch->name);
+               if (argc > 1)
+                       die(_("too many branches 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);
@@ -887,6 +1004,12 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                int branch_existed = 0, remote_tracking = 0;
                struct strbuf buf = STRBUF_INIT;
 
+               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 (kinds != REF_LOCAL_BRANCH)
                        die(_("-a and -r options to 'git branch' do not make sense with a branch name"));
 
@@ -899,7 +1022,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 
                branch_existed = ref_exists(branch->refname);
                create_branch(head, argv[0], (argc == 2) ? argv[1] : head,
-                             force_create, reflog, 0, quiet, track);
+                             force, reflog, 0, quiet, track);
 
                /*
                 * We only show the instructions if the user gave us