text: #include "cache.h"
  #include "config.h"
  #include "pretty.h"
  #include "refs.h"
  #include "builtin.h"
  #include "color.h"
  #include "argv-array.h"
  #include "parse-options.h"
  #include "dir.h"
  #include "commit-slab.h"
  
  static const char* show_branch_usage[] = {
      N_("git show-branch [-a | --all] [-r | --remotes] [--topo-order | --date-order]\n"
         "		[--current] [--color[=<when>] | --no-color] [--sparse]\n"
         "		[--more=<n> | --list | --independent | --merge-base]\n"
         "		[--no-name | --sha1-name] [--topics] [(<rev> | <glob>)...]"),
      N_("git show-branch (-g | --reflog)[=<n>[,<base>]] [--list] [<ref>]"),
      NULL
  };
  
  static int showbranch_use_color = -1;
  
  static struct argv_array default_args = ARGV_ARRAY_INIT;
  
  /*
   * TODO: convert this use of commit->object.flags to commit-slab
   * instead to store a pointer to ref name directly. Then use the same
   * UNINTERESTING definition from revision.h here.
   */
  #define UNINTERESTING	01
  
  #define REV_SHIFT	 2
  #define MAX_REVS	(FLAG_BITS - REV_SHIFT) /* should not exceed bits_per_int - REV_SHIFT */
  
  #define DEFAULT_REFLOG	4
  
  static const char *get_color_code(int idx)
  {
  	if (want_color(showbranch_use_color))
  		return column_colors_ansi[idx % column_colors_ansi_max];
  	return "";
  }
  
  static const char *get_color_reset_code(void)
  {
  	if (want_color(showbranch_use_color))
  		return GIT_COLOR_RESET;
  	return "";
  }
  
  static struct commit *interesting(struct commit_list *list)
  {
  	while (list) {
  		struct commit *commit = list->item;
  		list = list->next;
  		if (commit->object.flags & UNINTERESTING)
  			continue;
  		return commit;
  	}
  	return NULL;
  }
  
  struct commit_name {
  	const char *head_name; /* which head's ancestor? */
  	int generation; /* how many parents away from head_name */
  };
  
  define_commit_slab(commit_name_slab, struct commit_name *);
  static struct commit_name_slab name_slab;
  
  static struct commit_name *commit_to_name(struct commit *commit)
  {
  	return *commit_name_slab_at(&name_slab, commit);
  }
  
  
  /* Name the commit as nth generation ancestor of head_name;
   * we count only the first-parent relationship for naming purposes.
   */
  static void name_commit(struct commit *commit, const char *head_name, int nth)
  {
  	struct commit_name *name;
  
  	name = *commit_name_slab_at(&name_slab, commit);
  	if (!name) {
  		name = xmalloc(sizeof(*name));
  		*commit_name_slab_at(&name_slab, commit) = name;
  	}
  	name->head_name = head_name;
  	name->generation = nth;
  }
  
  /* Parent is the first parent of the commit.  We may name it
   * as (n+1)th generation ancestor of the same head_name as
   * commit is nth generation ancestor of, if that generation
   * number is better than the name it already has.
   */
  static void name_parent(struct commit *commit, struct commit *parent)
  {
  	struct commit_name *commit_name = commit_to_name(commit);
  	struct commit_name *parent_name = commit_to_name(parent);
  	if (!commit_name)
  		return;
  	if (!parent_name ||
  	    commit_name->generation + 1 < parent_name->generation)
  		name_commit(parent, commit_name->head_name,
  			    commit_name->generation + 1);
  }
  
  static int name_first_parent_chain(struct commit *c)
  {
  	int i = 0;
  	while (c) {
  		struct commit *p;
  		if (!commit_to_name(c))
  			break;
  		if (!c->parents)
  			break;
  		p = c->parents->item;
  		if (!commit_to_name(p)) {
  			name_parent(c, p);
  			i++;
  		}
  		else
  			break;
  		c = p;
  	}
  	return i;
  }
  
  static void name_commits(struct commit_list *list,
  			 struct commit **rev,
  			 char **ref_name,
  			 int num_rev)
  {
  	struct commit_list *cl;
  	struct commit *c;
  	int i;
  
  	/* First give names to the given heads */
  	for (cl = list; cl; cl = cl->next) {
  		c = cl->item;
  		if (commit_to_name(c))
  			continue;
  		for (i = 0; i < num_rev; i++) {
  			if (rev[i] == c) {
  				name_commit(c, ref_name[i], 0);
  				break;
  			}
  		}
  	}
  
  	/* Then commits on the first parent ancestry chain */
  	do {
  		i = 0;
  		for (cl = list; cl; cl = cl->next) {
  			i += name_first_parent_chain(cl->item);
  		}
  	} while (i);
  
  	/* Finally, any unnamed commits */
  	do {
  		i = 0;
  		for (cl = list; cl; cl = cl->next) {
  			struct commit_list *parents;
  			struct commit_name *n;
  			int nth;
  			c = cl->item;
  			if (!commit_to_name(c))
  				continue;
  			n = commit_to_name(c);
  			parents = c->parents;
  			nth = 0;
  			while (parents) {
  				struct commit *p = parents->item;
  				struct strbuf newname = STRBUF_INIT;
  				parents = parents->next;
  				nth++;
  				if (commit_to_name(p))
  					continue;
  				switch (n->generation) {
  				case 0:
  					strbuf_addstr(&newname, n->head_name);
  					break;
  				case 1:
  					strbuf_addf(&newname, "%s^", n->head_name);
  					break;
  				default:
  					strbuf_addf(&newname, "%s~%d",
  						    n->head_name, n->generation);
  					break;
  				}
  				if (nth == 1)
  					strbuf_addch(&newname, '^');
  				else
  					strbuf_addf(&newname, "^%d", nth);
  				name_commit(p, strbuf_detach(&newname, NULL), 0);
  				i++;
  				name_first_parent_chain(p);
  			}
  		}
  	} while (i);
  }
  
  static int mark_seen(struct commit *commit, struct commit_list **seen_p)
  {
  	if (!commit->object.flags) {
  		commit_list_insert(commit, seen_p);
  		return 1;
  	}
  	return 0;
  }
  
  static void join_revs(struct commit_list **list_p,
  		      struct commit_list **seen_p,
  		      int num_rev, int extra)
  {
  	int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
  	int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
  
  	while (*list_p) {
  		struct commit_list *parents;
  		int still_interesting = !!interesting(*list_p);
  		struct commit *commit = pop_commit(list_p);
  		int flags = commit->object.flags & all_mask;
  
  		if (!still_interesting && extra <= 0)
  			break;
  
  		mark_seen(commit, seen_p);
  		if ((flags & all_revs) == all_revs)
  			flags |= UNINTERESTING;
  		parents = commit->parents;
  
  		while (parents) {
  			struct commit *p = parents->item;
  			int this_flag = p->object.flags;
  			parents = parents->next;
  			if ((this_flag & flags) == flags)
  				continue;
  			parse_commit(p);
  			if (mark_seen(p, seen_p) && !still_interesting)
  				extra--;
  			p->object.flags |= flags;
  			commit_list_insert_by_date(p, list_p);
  		}
  	}
  
  	/*
  	 * Postprocess to complete well-poisoning.
  	 *
  	 * At this point we have all the commits we have seen in
  	 * seen_p list.  Mark anything that can be reached from
  	 * uninteresting commits not interesting.
  	 */
  	for (;;) {
  		int changed = 0;
  		struct commit_list *s;
  		for (s = *seen_p; s; s = s->next) {
  			struct commit *c = s->item;
  			struct commit_list *parents;
  
  			if (((c->object.flags & all_revs) != all_revs) &&
  			    !(c->object.flags & UNINTERESTING))
  				continue;
  
  			/* The current commit is either a merge base or
  			 * already uninteresting one.  Mark its parents
  			 * as uninteresting commits _only_ if they are
  			 * already parsed.  No reason to find new ones
  			 * here.
  			 */
  			parents = c->parents;
  			while (parents) {
  				struct commit *p = parents->item;
  				parents = parents->next;
  				if (!(p->object.flags & UNINTERESTING)) {
  					p->object.flags |= UNINTERESTING;
  					changed = 1;
  				}
  			}
  		}
  		if (!changed)
  			break;
  	}
  }
  
  static void show_one_commit(struct commit *commit, int no_name)
  {
  	struct strbuf pretty = STRBUF_INIT;
  	const char *pretty_str = "(unavailable)";
  	struct commit_name *name = commit_to_name(commit);
  
  	if (commit->object.parsed) {
  		pp_commit_easy(CMIT_FMT_ONELINE, commit, &pretty);
  		pretty_str = pretty.buf;
  	}
  	skip_prefix(pretty_str, "[PATCH] ", &pretty_str);
  
  	if (!no_name) {
  		if (name && name->head_name) {
  			printf("[%s", name->head_name);
  			if (name->generation) {
  				if (name->generation == 1)
  					printf("^");
  				else
  					printf("~%d", name->generation);
  			}
  			printf("] ");
  		}
  		else
  			printf("[%s] ",
  			       find_unique_abbrev(&commit->object.oid,
  						  DEFAULT_ABBREV));
  	}
  	puts(pretty_str);
  	strbuf_release(&pretty);
  }
  
  static char *ref_name[MAX_REVS + 1];
  static int ref_name_cnt;
  
  static const char *find_digit_prefix(const char *s, int *v)
  {
  	const char *p;
  	int ver;
  	char ch;
  
  	for (p = s, ver = 0;
  	     '0' <= (ch = *p) && ch <= '9';
  	     p++)
  		ver = ver * 10 + ch - '0';
  	*v = ver;
  	return p;
  }
  
  
  static int version_cmp(const char *a, const char *b)
  {
  	while (1) {
  		int va, vb;
  
  		a = find_digit_prefix(a, &va);
  		b = find_digit_prefix(b, &vb);
  		if (va != vb)
  			return va - vb;
  
  		while (1) {
  			int ca = *a;
  			int cb = *b;
  			if ('0' <= ca && ca <= '9')
  				ca = 0;
  			if ('0' <= cb && cb <= '9')
  				cb = 0;
  			if (ca != cb)
  				return ca - cb;
  			if (!ca)
  				break;
  			a++;
  			b++;
  		}
  		if (!*a && !*b)
  			return 0;
  	}
  }
  
  static int compare_ref_name(const void *a_, const void *b_)
  {
  	const char * const*a = a_, * const*b = b_;
  	return version_cmp(*a, *b);
  }
  
  static void sort_ref_range(int bottom, int top)
  {
  	QSORT(ref_name + bottom, top - bottom, compare_ref_name);
  }
  
  static int append_ref(const char *refname, const struct object_id *oid,
  		      int allow_dups)
  {
  	struct commit *commit = lookup_commit_reference_gently(the_repository,
  							       oid, 1);
  	int i;
  
  	if (!commit)
  		return 0;
  
  	if (!allow_dups) {
  		/* Avoid adding the same thing twice */
  		for (i = 0; i < ref_name_cnt; i++)
  			if (!strcmp(refname, ref_name[i]))
  				return 0;
  	}
  	if (MAX_REVS <= ref_name_cnt) {
  		warning(Q_("ignoring %s; cannot handle more than %d ref",
  			   "ignoring %s; cannot handle more than %d refs",
  			   MAX_REVS), refname, MAX_REVS);
  		return 0;
  	}
  	ref_name[ref_name_cnt++] = xstrdup(refname);
  	ref_name[ref_name_cnt] = NULL;
  	return 0;
  }
  
  static int append_head_ref(const char *refname, const struct object_id *oid,
  			   int flag, void *cb_data)
  {
  	struct object_id tmp;
  	int ofs = 11;
  	if (!starts_with(refname, "refs/heads/"))
  		return 0;
  	/* If both heads/foo and tags/foo exists, get_sha1 would
  	 * get confused.
  	 */
  	if (get_oid(refname + ofs, &tmp) || !oideq(&tmp, oid))
  		ofs = 5;
  	return append_ref(refname + ofs, oid, 0);
  }
  
  static int append_remote_ref(const char *refname, const struct object_id *oid,
  			     int flag, void *cb_data)
  {
  	struct object_id tmp;
  	int ofs = 13;
  	if (!starts_with(refname, "refs/remotes/"))
  		return 0;
  	/* If both heads/foo and tags/foo exists, get_sha1 would
  	 * get confused.
  	 */
  	if (get_oid(refname + ofs, &tmp) || !oideq(&tmp, oid))
  		ofs = 5;
  	return append_ref(refname + ofs, oid, 0);
  }
  
  static int append_tag_ref(const char *refname, const struct object_id *oid,
  			  int flag, void *cb_data)
  {
  	if (!starts_with(refname, "refs/tags/"))
  		return 0;
  	return append_ref(refname + 5, oid, 0);
  }
  
  static const char *match_ref_pattern = NULL;
  static int match_ref_slash = 0;
  
  static int append_matching_ref(const char *refname, const struct object_id *oid,
  			       int flag, void *cb_data)
  {
  	/* we want to allow pattern hold/<asterisk> to show all
  	 * branches under refs/heads/hold/, and v0.99.9? to show
  	 * refs/tags/v0.99.9a and friends.
  	 */
  	const char *tail;
  	int slash = count_slashes(refname);
  	for (tail = refname; *tail && match_ref_slash < slash; )
  		if (*tail++ == '/')
  			slash--;
  	if (!*tail)
  		return 0;
  	if (wildmatch(match_ref_pattern, tail, 0))
  		return 0;
  	if (starts_with(refname, "refs/heads/"))
  		return append_head_ref(refname, oid, flag, cb_data);
  	if (starts_with(refname, "refs/tags/"))
  		return append_tag_ref(refname, oid, flag, cb_data);
  	return append_ref(refname, oid, 0);
  }
  
  static void snarf_refs(int head, int remotes)
  {
  	if (head) {
  		int orig_cnt = ref_name_cnt;
  
  		for_each_ref(append_head_ref, NULL);
  		sort_ref_range(orig_cnt, ref_name_cnt);
  	}
  	if (remotes) {
  		int orig_cnt = ref_name_cnt;
  
  		for_each_ref(append_remote_ref, NULL);
  		sort_ref_range(orig_cnt, ref_name_cnt);
  	}
  }
  
  static int rev_is_head(const char *head, const char *name,
  		       unsigned char *head_sha1, unsigned char *sha1)
  {
  	if (!head || (head_sha1 && sha1 && !hasheq(head_sha1, sha1)))
  		return 0;
  	skip_prefix(head, "refs/heads/", &head);
  	if (!skip_prefix(name, "refs/heads/", &name))
  		skip_prefix(name, "heads/", &name);
  	return !strcmp(head, name);
  }
  
  static int show_merge_base(struct commit_list *seen, int num_rev)
  {
  	int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
  	int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
  	int exit_status = 1;
  
  	while (seen) {
  		struct commit *commit = pop_commit(&seen);
  		int flags = commit->object.flags & all_mask;
  		if (!(flags & UNINTERESTING) &&
  		    ((flags & all_revs) == all_revs)) {
  			puts(oid_to_hex(&commit->object.oid));
  			exit_status = 0;
  			commit->object.flags |= UNINTERESTING;
  		}
  	}
  	return exit_status;
  }
  
  static int show_independent(struct commit **rev,
  			    int num_rev,
  			    unsigned int *rev_mask)
  {
  	int i;
  
  	for (i = 0; i < num_rev; i++) {
  		struct commit *commit = rev[i];
  		unsigned int flag = rev_mask[i];
  
  		if (commit->object.flags == flag)
  			puts(oid_to_hex(&commit->object.oid));
  		commit->object.flags |= UNINTERESTING;
  	}
  	return 0;
  }
  
  static void append_one_rev(const char *av)
  {
  	struct object_id revkey;
  	if (!get_oid(av, &revkey)) {
  		append_ref(av, &revkey, 0);
  		return;
  	}
  	if (strchr(av, '*') || strchr(av, '?') || strchr(av, '[')) {
  		/* glob style match */
  		int saved_matches = ref_name_cnt;
  
  		match_ref_pattern = av;
  		match_ref_slash = count_slashes(av);
  		for_each_ref(append_matching_ref, NULL);
  		if (saved_matches == ref_name_cnt &&
  		    ref_name_cnt < MAX_REVS)
  			error(_("no matching refs with %s"), av);
  		sort_ref_range(saved_matches, ref_name_cnt);
  		return;
  	}
  	die("bad sha1 reference %s", av);
  }
  
  static int git_show_branch_config(const char *var, const char *value, void *cb)
  {
  	if (!strcmp(var, "showbranch.default")) {
  		if (!value)
  			return config_error_nonbool(var);
  		/*
  		 * default_arg is now passed to parse_options(), so we need to
  		 * mimic the real argv a bit better.
  		 */
  		if (!default_args.argc)
  			argv_array_push(&default_args, "show-branch");
  		argv_array_push(&default_args, value);
  		return 0;
  	}
  
  	if (!strcmp(var, "color.showbranch")) {
  		showbranch_use_color = git_config_colorbool(var, value);
  		return 0;
  	}
  
  	return git_color_default_config(var, value, cb);
  }
  
  static int omit_in_dense(struct commit *commit, struct commit **rev, int n)
  {
  	/* If the commit is tip of the named branches, do not
  	 * omit it.
  	 * Otherwise, if it is a merge that is reachable from only one
  	 * tip, it is not that interesting.
  	 */
  	int i, flag, count;
  	for (i = 0; i < n; i++)
  		if (rev[i] == commit)
  			return 0;
  	flag = commit->object.flags;
  	for (i = count = 0; i < n; i++) {
  		if (flag & (1u << (i + REV_SHIFT)))
  			count++;
  	}
  	if (count == 1)
  		return 1;
  	return 0;
  }
  
  static int reflog = 0;
  
  static int parse_reflog_param(const struct option *opt, const char *arg,
  			      int unset)
  {
  	char *ep;
  	const char **base = (const char **)opt->value;
  	BUG_ON_OPT_NEG(unset);
  	if (!arg)
  		arg = "";
  	reflog = strtoul(arg, &ep, 10);
  	if (*ep == ',')
  		*base = ep + 1;
  	else if (*ep)
  		return error("unrecognized reflog param '%s'", arg);
  	else
  		*base = NULL;
  	if (reflog <= 0)
  		reflog = DEFAULT_REFLOG;
  	return 0;
  }
  
  int cmd_show_branch(int ac, const char **av, const char *prefix)
  {
  	struct commit *rev[MAX_REVS], *commit;
  	char *reflog_msg[MAX_REVS];
  	struct commit_list *list = NULL, *seen = NULL;
  	unsigned int rev_mask[MAX_REVS];
  	int num_rev, i, extra = 0;
  	int all_heads = 0, all_remotes = 0;
  	int all_mask, all_revs;
  	enum rev_sort_order sort_order = REV_SORT_IN_GRAPH_ORDER;
  	char *head;
  	struct object_id head_oid;
  	int merge_base = 0;
  	int independent = 0;
  	int no_name = 0;
  	int sha1_name = 0;
  	int shown_merge_point = 0;
  	int with_current_branch = 0;
  	int head_at = -1;
  	int topics = 0;
  	int dense = 1;
  	const char *reflog_base = NULL;
  	struct option builtin_show_branch_options[] = {
  		OPT_BOOL('a', "all", &all_heads,
  			 N_("show remote-tracking and local branches")),
  		OPT_BOOL('r', "remotes", &all_remotes,
  			 N_("show remote-tracking branches")),
  		OPT__COLOR(&showbranch_use_color,
  			    N_("color '*!+-' corresponding to the branch")),
  		{ OPTION_INTEGER, 0, "more", &extra, N_("n"),
  			    N_("show <n> more commits after the common ancestor"),
  			    PARSE_OPT_OPTARG, NULL, (intptr_t)1 },
  		OPT_SET_INT(0, "list", &extra, N_("synonym to more=-1"), -1),
  		OPT_BOOL(0, "no-name", &no_name, N_("suppress naming strings")),
  		OPT_BOOL(0, "current", &with_current_branch,
  			 N_("include the current branch")),
  		OPT_BOOL(0, "sha1-name", &sha1_name,
  			 N_("name commits with their object names")),
  		OPT_BOOL(0, "merge-base", &merge_base,
  			 N_("show possible merge bases")),
  		OPT_BOOL(0, "independent", &independent,
  			    N_("show refs unreachable from any other ref")),
  		OPT_SET_INT(0, "topo-order", &sort_order,
  			    N_("show commits in topological order"),
  			    REV_SORT_IN_GRAPH_ORDER),
  		OPT_BOOL(0, "topics", &topics,
  			 N_("show only commits not on the first branch")),
  		OPT_SET_INT(0, "sparse", &dense,
  			    N_("show merges reachable from only one tip"), 0),
  		OPT_SET_INT(0, "date-order", &sort_order,
  			    N_("topologically sort, maintaining date order "
  			       "where possible"),
  			    REV_SORT_BY_COMMIT_DATE),
  		{ OPTION_CALLBACK, 'g', "reflog", &reflog_base, N_("<n>[,<base>]"),
  			    N_("show <n> most recent ref-log entries starting at "
  			       "base"),
  			    PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
  			    parse_reflog_param },
  		OPT_END()
  	};
  
  	init_commit_name_slab(&name_slab);
  
  	git_config(git_show_branch_config, NULL);
  
  	/* If nothing is specified, try the default first */
  	if (ac == 1 && default_args.argc) {
  		ac = default_args.argc;
  		av = default_args.argv;
  	}
  
  	ac = parse_options(ac, av, prefix, builtin_show_branch_options,
  			   show_branch_usage, PARSE_OPT_STOP_AT_NON_OPTION);
  	if (all_heads)
  		all_remotes = 1;
  
  	if (extra || reflog) {
  		/* "listing" mode is incompatible with
  		 * independent nor merge-base modes.
  		 */
  		if (independent || merge_base)
  			usage_with_options(show_branch_usage,
  					   builtin_show_branch_options);
  		if (reflog && ((0 < extra) || all_heads || all_remotes))
  			/*
  			 * Asking for --more in reflog mode does not
  			 * make sense.  --list is Ok.
  			 *
  			 * Also --all and --remotes do not make sense either.
  			 */
  			die(_("--reflog is incompatible with --all, --remotes, "
  			      "--independent or --merge-base"));
  	}
  
  	/* If nothing is specified, show all branches by default */
  	if (ac <= topics && all_heads + all_remotes == 0)
  		all_heads = 1;
  
  	if (reflog) {
  		struct object_id oid;
  		char *ref;
  		int base = 0;
  		unsigned int flags = 0;
  
  		if (ac == 0) {
  			static const char *fake_av[2];
  
  			fake_av[0] = resolve_refdup("HEAD",
  						    RESOLVE_REF_READING, &oid,
  						    NULL);
  			fake_av[1] = NULL;
  			av = fake_av;
  			ac = 1;
  			if (!*av)
  				die(_("no branches given, and HEAD is not valid"));
  		}
  		if (ac != 1)
  			die(_("--reflog option needs one branch name"));
  
  		if (MAX_REVS < reflog)
  			die(Q_("only %d entry can be shown at one time.",
  			       "only %d entries can be shown at one time.",
  			       MAX_REVS), MAX_REVS);
  		if (!dwim_ref(*av, strlen(*av), &oid, &ref))
  			die(_("no such ref %s"), *av);
  
  		/* Has the base been specified? */
  		if (reflog_base) {
  			char *ep;
  			base = strtoul(reflog_base, &ep, 10);
  			if (*ep) {
  				/* Ah, that is a date spec... */
  				timestamp_t at;
  				at = approxidate(reflog_base);
  				read_ref_at(get_main_ref_store(the_repository),
  					    ref, flags, at, -1, &oid, NULL,
  					    NULL, NULL, &base);
  			}
  		}
  
  		for (i = 0; i < reflog; i++) {
  			char *logmsg;
  			char *nth_desc;
  			const char *msg;
  			timestamp_t timestamp;
  			int tz;
  
  			if (read_ref_at(get_main_ref_store(the_repository),
  					ref, flags, 0, base + i, &oid, &logmsg,
  					&timestamp, &tz, NULL)) {
  				reflog = i;
  				break;
  			}
  			msg = strchr(logmsg, '\t');
  			if (!msg)
  				msg = "(none)";
  			else
  				msg++;
  			reflog_msg[i] = xstrfmt("(%s) %s",
  						show_date(timestamp, tz,
  							  DATE_MODE(RELATIVE)),
  						msg);
  			free(logmsg);
  
  			nth_desc = xstrfmt("%s@{%d}", *av, base+i);
  			append_ref(nth_desc, &oid, 1);
  			free(nth_desc);
  		}
  		free(ref);
  	}
  	else {
  		while (0 < ac) {
  			append_one_rev(*av);
  			ac--; av++;
  		}
  		if (all_heads + all_remotes)
  			snarf_refs(all_heads, all_remotes);
  	}
  
  	head = resolve_refdup("HEAD", RESOLVE_REF_READING,
  			      &head_oid, NULL);
  
  	if (with_current_branch && head) {
  		int has_head = 0;
  		for (i = 0; !has_head && i < ref_name_cnt; i++) {
  			/* We are only interested in adding the branch
  			 * HEAD points at.
  			 */
  			if (rev_is_head(head,
  					ref_name[i],
  					head_oid.hash, NULL))
  				has_head++;
  		}
  		if (!has_head) {
  			const char *name = head;
  			skip_prefix(name, "refs/heads/", &name);
  			append_one_rev(name);
  		}
  	}
  
  	if (!ref_name_cnt) {
  		fprintf(stderr, "No revs to be shown.\n");
  		exit(0);
  	}
  
  	for (num_rev = 0; ref_name[num_rev]; num_rev++) {
  		struct object_id revkey;
  		unsigned int flag = 1u << (num_rev + REV_SHIFT);
  
  		if (MAX_REVS <= num_rev)
  			die(Q_("cannot handle more than %d rev.",
  			       "cannot handle more than %d revs.",
  			       MAX_REVS), MAX_REVS);
  		if (get_oid(ref_name[num_rev], &revkey))
  			die(_("'%s' is not a valid ref."), ref_name[num_rev]);
  		commit = lookup_commit_reference(the_repository, &revkey);
  		if (!commit)
  			die(_("cannot find commit %s (%s)"),
  			    ref_name[num_rev], oid_to_hex(&revkey));
  		parse_commit(commit);
  		mark_seen(commit, &seen);
  
  		/* rev#0 uses bit REV_SHIFT, rev#1 uses bit REV_SHIFT+1,
  		 * and so on.  REV_SHIFT bits from bit 0 are used for
  		 * internal bookkeeping.
  		 */
  		commit->object.flags |= flag;
  		if (commit->object.flags == flag)
  			commit_list_insert_by_date(commit, &list);
  		rev[num_rev] = commit;
  	}
  	for (i = 0; i < num_rev; i++)
  		rev_mask[i] = rev[i]->object.flags;
  
  	if (0 <= extra)
  		join_revs(&list, &seen, num_rev, extra);
  
  	commit_list_sort_by_date(&seen);
  
  	if (merge_base)
  		return show_merge_base(seen, num_rev);
  
  	if (independent)
  		return show_independent(rev, num_rev, rev_mask);
  
  	/* Show list; --more=-1 means list-only */
  	if (1 < num_rev || extra < 0) {
  		for (i = 0; i < num_rev; i++) {
  			int j;
  			int is_head = rev_is_head(head,
  						  ref_name[i],
  						  head_oid.hash,
  						  rev[i]->object.oid.hash);
  			if (extra < 0)
  				printf("%c [%s] ",
  				       is_head ? '*' : ' ', ref_name[i]);
  			else {
  				for (j = 0; j < i; j++)
  					putchar(' ');
  				printf("%s%c%s [%s] ",
  				       get_color_code(i),
  				       is_head ? '*' : '!',
  				       get_color_reset_code(), ref_name[i]);
  			}
  
  			if (!reflog) {
  				/* header lines never need name */
  				show_one_commit(rev[i], 1);
  			}
  			else
  				puts(reflog_msg[i]);
  
  			if (is_head)
  				head_at = i;
  		}
  		if (0 <= extra) {
  			for (i = 0; i < num_rev; i++)
  				putchar('-');
  			putchar('\n');
  		}
  	}
  	if (extra < 0)
  		exit(0);
  
  	/* Sort topologically */
  	sort_in_topological_order(&seen, sort_order);
  
  	/* Give names to commits */
  	if (!sha1_name && !no_name)
  		name_commits(seen, rev, ref_name, num_rev);
  
  	all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
  	all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
  
  	while (seen) {
  		struct commit *commit = pop_commit(&seen);
  		int this_flag = commit->object.flags;
  		int is_merge_point = ((this_flag & all_revs) == all_revs);
  
  		shown_merge_point |= is_merge_point;
  
  		if (1 < num_rev) {
  			int is_merge = !!(commit->parents &&
  					  commit->parents->next);
  			if (topics &&
  			    !is_merge_point &&
  			    (this_flag & (1u << REV_SHIFT)))
  				continue;
  			if (dense && is_merge &&
  			    omit_in_dense(commit, rev, num_rev))
  				continue;
  			for (i = 0; i < num_rev; i++) {
  				int mark;
  				if (!(this_flag & (1u << (i + REV_SHIFT))))
  					mark = ' ';
  				else if (is_merge)
  					mark = '-';
  				else if (i == head_at)
  					mark = '*';
  				else
  					mark = '+';
  				printf("%s%c%s",
  				       get_color_code(i),
  				       mark, get_color_reset_code());
  			}
  			putchar(' ');
  		}
  		show_one_commit(commit, no_name);
  
  		if (shown_merge_point && --extra < 0)
  			break;
  	}
  	return 0;
  }
  