/*
 * Copyright 2004-2005 Timo Hirvonen
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */
 
#include "command_mode.h"
#include "search_mode.h"
#include "cmdline.h"
#include "options.h"
#include "ui_curses.h"
#include "history.h"
#include "tabexp.h"
#include "tabexp_file.h"
#include "browser.h"
#include "filters.h"
#include "player.h"
#include "output.h"
#include "editable.h"
#include "lib.h"
#include "pl.h"
#include "play_queue.h"
#include "cmus.h"
#include "worker.h"
#include "keys.h"
#include "xmalloc.h"
#include "xstrjoin.h"
#include "misc.h"
#include "path.h"
#include "format_print.h"
#include "spawn.h"
#include "utils.h"
#include "list.h"
#include "debug.h"
#include "load_dir.h"
#include "config/datadir.h"
#include "help.h"
 
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <dirent.h>
#include <pwd.h>
 
#if defined(__sun__)
#include <ncurses.h>
#else
#include <curses.h>
#endif
 
static struct history cmd_history;
static char *cmd_history_filename;
static char *history_search_text = NULL;
static int arg_expand_cmd = -1;
static int prev_view = -1;
 
static char *get_home_dir(const char *username)
{
	struct passwd *passwd;
 
	if (username == NULL)
		return xstrdup(home_dir);
	passwd = getpwnam(username);
	if (passwd == NULL)
		return NULL;
	/* don't free passwd */
	return xstrdup(passwd->pw_dir);
}
 
static char *expand_filename(const char *name)
{
	if (name[0] == '~') {
		char *slash;
 
		slash = strchr(name, '/');
		if (slash) {
			char *username, *home;
 
			if (slash - name - 1 > 0) {
				/* ~user/... */
				username = xstrndup(name + 1, slash - name - 1);
			} else {
				/* ~/... */
				username = NULL;
			}
			home = get_home_dir(username);
			free(username);
			if (home) {
				char *expanded;
 
				expanded = xstrjoin(home, slash);
				free(home);
				return expanded;
			} else {
				return xstrdup(name);
			}
		} else {
			if (name[1] == 0) {
				return xstrdup(home_dir);
			} else {
				char *home;
 
				home = get_home_dir(name + 1);
				if (home)
					return home;
				return xstrdup(name);
			}
		}
	} else {
		return xstrdup(name);
	}
}
 
/* view {{{ */
 
void view_clear(int view)
{
	switch (view) {
	case TREE_VIEW:
	case SORTED_VIEW:
		worker_remove_jobs(JOB_TYPE_LIB);
		editable_lock();
		editable_clear(&lib_editable);
 
		/* FIXME: make this optional? */
		lib_clear_store();
 
		editable_unlock();
		break;
	case PLAYLIST_VIEW:
		worker_remove_jobs(JOB_TYPE_PL);
		editable_lock();
		editable_clear(&pl_editable);
		editable_unlock();
		break;
	case QUEUE_VIEW:
		worker_remove_jobs(JOB_TYPE_QUEUE);
		editable_lock();
		editable_clear(&pq_editable);
		editable_unlock();
		break;
	default:
		info_msg(":clear only works in views 1-4");
	}
}
 
void view_add(int view, char *arg, int prepend)
{
	char *tmp, *name;
	enum file_type ft;
 
	tmp = expand_filename(arg);
	ft = cmus_detect_ft(tmp, &name);
	if (ft == FILE_TYPE_INVALID) {
		error_msg("adding '%s': %s", tmp, strerror(errno));
		free(tmp);
		return;
	}
	free(tmp);
 
	switch (view) {
	case TREE_VIEW:
	case SORTED_VIEW:
		cmus_add(lib_add_track, name, ft, JOB_TYPE_LIB);
		break;
	case PLAYLIST_VIEW:
		cmus_add(pl_add_track, name, ft, JOB_TYPE_PL);
		break;
	case QUEUE_VIEW:
		if (prepend) {
			cmus_add(play_queue_prepend, name, ft, JOB_TYPE_QUEUE);
		} else {
			cmus_add(play_queue_append, name, ft, JOB_TYPE_QUEUE);
		}
		break;
	default:
		info_msg(":add only works in views 1-4");
	}
	free(name);
}
 
void view_load(int view, char *arg)
{
	char *tmp, *name;
	enum file_type ft;
 
	tmp = expand_filename(arg);
	ft = cmus_detect_ft(tmp, &name);
	if (ft == FILE_TYPE_INVALID) {
		error_msg("loading '%s': %s", tmp, strerror(errno));
		free(tmp);
		return;
	}
	free(tmp);
 
	if (ft == FILE_TYPE_FILE)
		ft = FILE_TYPE_PL;
	if (ft != FILE_TYPE_PL) {
		error_msg("loading '%s': not a playlist file", name);
		free(name);
		return;
	}
 
	switch (view) {
	case TREE_VIEW:
	case SORTED_VIEW:
		worker_remove_jobs(JOB_TYPE_LIB);
		editable_lock();
		editable_clear(&lib_editable);
		editable_unlock();
		cmus_add(lib_add_track, name, FILE_TYPE_PL, JOB_TYPE_LIB);
		free(lib_filename);
		lib_filename = name;
		break;
	case PLAYLIST_VIEW:
		worker_remove_jobs(JOB_TYPE_PL);
		editable_lock();
		editable_clear(&pl_editable);
		editable_unlock();
		cmus_add(pl_add_track, name, FILE_TYPE_PL, JOB_TYPE_PL);
		free(pl_filename);
		pl_filename = name;
		break;
	default:
		info_msg(":load only works in views 1-3");
		free(name);
	}
}
 
static void do_save(for_each_ti_cb for_each_ti, const char *arg, char **filenamep)
{
	char *filename = *filenamep;
 
	if (arg) {
		free(filename);
		filename = xstrdup(arg);
		*filenamep = filename;
	}
 
	editable_lock();
	if (cmus_save(for_each_ti, filename) == -1)
		error_msg("saving '%s': %s", filename, strerror(errno));
	editable_unlock();
}
 
void view_save(int view, char *arg)
{
	if (arg) {
		char *tmp;
 
		tmp = expand_filename(arg);
		arg = path_absolute(tmp);
		free(tmp);
	}
 
	switch (view) {
	case TREE_VIEW:
	case SORTED_VIEW:
		if (worker_has_job(JOB_TYPE_LIB))
			goto worker_running;
		do_save(lib_for_each, arg, &lib_filename);
		break;
	case PLAYLIST_VIEW:
		if (worker_has_job(JOB_TYPE_PL))
			goto worker_running;
		do_save(pl_for_each, arg, &pl_filename);
		break;
	default:
		info_msg(":save only works in views 1 & 2 (library) and 3 (playlist)");
	}
	free(arg);
	return;
worker_running:
	error_msg("can't save when tracks are being added");
	free(arg);
}
 
/* }}} */
 
/* only returns the last flag which is enough for it's callers */
static int parse_flags(const char **strp, const char *flags)
{
	const char *str = *strp;
	int flag = 0;
 
	if (str == NULL)
		return flag;
 
	while (*str) {
		if (*str != '-')
			break;
 
		// "-"
		if (str[1] == 0)
			break;
 
		// "--" or "-- "
		if (str[1] == '-' && (str[2] == 0 || str[2] == ' ')) {
			str += 2;
			break;
		}
 
		// not "-?" or "-? "
		if (str[2] && str[2] != ' ')
			break;
 
		flag = str[1];
		if (!strchr(flags, flag)) {
			error_msg("invalid option -%c", flag);
			return -1;
		}
 
		str += 2;
 
		while (*str == ' ')
			str++;
	}
	while (*str == ' ')
		str++;
	if (*str == 0)
		str = NULL;
	*strp = str;
	return flag;
}
 
static int flag_to_view(int flag)
{
	switch (flag) {
	case 'l':
		return TREE_VIEW;
	case 'p':
		return PLAYLIST_VIEW;
	case 'q':
	case 'Q':
		return QUEUE_VIEW;
	default:
		return cur_view;
	}
}
 
static void cmd_add(char *arg)
{
	int flag = parse_flags((const char **)&arg, "lpqQ");
 
	if (flag == -1)
		return;
	if (arg == NULL) {
		error_msg("not enough arguments\n");
		return;
	}
	view_add(flag_to_view(flag), arg, flag == 'Q');
}
 
static void cmd_clear(char *arg)
{
	int flag = parse_flags((const char **)&arg, "lpq");
 
	if (flag == -1)
		return;
	if (arg) {
		error_msg("too many arguments\n");
		return;
	}
	view_clear(flag_to_view(flag));
}
 
static void cmd_load(char *arg)
{
	int flag = parse_flags((const char **)&arg, "lp");
 
	if (flag == -1)
		return;
	if (arg == NULL) {
		error_msg("not enough arguments\n");
		return;
	}
	view_load(flag_to_view(flag), arg);
}
 
static void cmd_save(char *arg)
{
	int flag = parse_flags((const char **)&arg, "lp");
 
	if (flag == -1)
		return;
	view_save(flag_to_view(flag), arg);
}
 
static void cmd_set(char *arg)
{
	char *value = NULL;
	int i;
 
	for (i = 0; arg[i]; i++) {
		if (arg[i] == '=') {
			arg[i] = 0;
			value = &arg[i + 1];
			break;
		}
	}
	if (value) {
		option_set(arg, value);
		help_win->changed = 1;
	} else {
		struct cmus_opt *opt;
		char buf[OPTION_MAX_SIZE];
 
		/* support "set <option>?" */
		i--;
		if (arg[i] == '?')
			arg[i] = 0;
 
		opt = option_find(arg);
		if (opt) {
			opt->get(opt->id, buf);
			info_msg("setting: '%s=%s'", arg, buf);
		}
	}
}
 
static void cmd_toggle(char *arg)
{
	struct cmus_opt *opt = option_find(arg);
 
	if (opt == NULL)
		return;
 
	if (opt->toggle == NULL) {
		error_msg("%s is not toggle option", opt->name);
		return;
	}
	opt->toggle(opt->id);
	help_win->changed = 1;
}
 
static int get_number(char *str, char **end)
{
	int val = 0;
 
	while (*str >= '0' && *str <= '9') {
		val *= 10;
		val += *str++ - '0';
	}
	*end = str;
	return val;
}
 
static void cmd_seek(char *arg)
{
	int relative = 0;
	int seek = 0, sign = 1, count;
 
	switch (*arg) {
	case '-':
		sign = -1;
	case '+':
		relative = 1;
		arg++;
		break;
	}
 
	count = 0;
	goto inside;
 
	do {
		int num;
		char *end;
 
		if (*arg != ':')
			break;
		arg++;
inside:
		num = get_number(arg, &end);
		if (arg == end)
			break;
		arg = end;
		seek = seek * 60 + num;
	} while (++count < 3);
 
	seek *= sign;
	if (!count)
		goto err;
 
	if (count == 1) {
		switch (tolower((unsigned char)*arg)) {
		case 'h':
			seek *= 60;
		case 'm':
			seek *= 60;
		case 's':
			arg++;
			break;
		}
	}
 
	if (!*arg) {
		player_seek(seek, relative);
		return;
	}
err:
	error_msg("expecting one argument: [+-]INTEGER[mh] or [+-]H:MM:SS");
}
 
static void cmd_factivate(char *arg)
{
	editable_lock();
	filters_activate_names(arg);
	editable_unlock();
}
 
static void cmd_filter(char *arg)
{
	editable_lock();
	filters_set_anonymous(arg);
	editable_unlock();
}
 
static void cmd_fset(char *arg)
{
	filters_set_filter(arg);
}
 
static void cmd_invert(char *arg)
{
	editable_lock();
	switch (cur_view) {
	case SORTED_VIEW:
		editable_invert_marks(&lib_editable);
		break;
	case PLAYLIST_VIEW:
		editable_invert_marks(&pl_editable);
		break;
	case QUEUE_VIEW:
		editable_invert_marks(&pq_editable);
		break;
	default:
		info_msg(":invert only works in views 2-4");
	}
	editable_unlock();
}
 
static void cmd_mark(char *arg)
{
	editable_lock();
	switch (cur_view) {
	case SORTED_VIEW:
		editable_mark(&lib_editable, arg);
		break;
	case PLAYLIST_VIEW:
		editable_mark(&pl_editable, arg);
		break;
	case QUEUE_VIEW:
		editable_mark(&pq_editable, arg);
		break;
	default:
		info_msg(":mark only works in views 2-4");
	}
	editable_unlock();
}
 
static void cmd_unmark(char *arg)
{
	editable_lock();
	switch (cur_view) {
	case SORTED_VIEW:
		editable_unmark(&lib_editable);
		break;
	case PLAYLIST_VIEW:
		editable_unmark(&pl_editable);
		break;
	case QUEUE_VIEW:
		editable_unmark(&pq_editable);
		break;
	default:
		info_msg(":unmark only works in views 2-4");
	}
	editable_unlock();
}
 
static void cmd_update_cache(char *arg)
{
	cmus_update_cache();
}
 
static void cmd_cd(char *arg)
{
	if (arg) {
		char *dir, *absolute;
 
		dir = expand_filename(arg);
		absolute = path_absolute(dir);
		if (chdir(dir) == -1) {
			error_msg("could not cd to '%s': %s", dir, strerror(errno));
		} else {
			browser_chdir(absolute);
		}
		free(absolute);
		free(dir);
	} else {
		if (chdir(home_dir) == -1) {
			error_msg("could not cd to '%s': %s", home_dir, strerror(errno));
		} else {
			browser_chdir(home_dir);
		}
	}
}
 
static void cmd_bind(char *arg)
{
	int flag = parse_flags((const char **)&arg, "f");
	char *key, *func;
 
	if (flag == -1)
		return;
 
	if (arg == NULL)
		goto err;
 
	key = strchr(arg, ' ');
	if (key == NULL)
		goto err;
	*key++ = 0;
	while (*key == ' ')
		key++;
 
	func = strchr(key, ' ');
	if (func == NULL)
		goto err;
	*func++ = 0;
	while (*func == ' ')
		func++;
	if (*func == 0)
		goto err;
 
	key_bind(arg, key, func, flag == 'f');
	return;
err:
	error_msg("expecting 3 arguments (context, key and function)\n");
}
 
static void cmd_unbind(char *arg)
{
	int flag = parse_flags((const char **)&arg, "f");
	char *key;
 
	if (flag == -1)
		return;
 
	if (arg == NULL)
		goto err;
 
	key = strchr(arg, ' ');
	if (key == NULL)
		goto err;
	*key++ = 0;
	while (*key == ' ')
		key++;
	if (*key == 0)
		goto err;
 
	/* FIXME: remove spaces at end */
 
	key_unbind(arg, key, flag == 'f');
	return;
err:
	error_msg("expecting 2 arguments (context and key)\n");
}
 
static void cmd_showbind(char *arg)
{
	char *key;
 
	key = strchr(arg, ' ');
	if (key == NULL)
		goto err;
	*key++ = 0;
	while (*key == ' ')
		key++;
	if (*key == 0)
		goto err;
 
	/* FIXME: remove spaces at end */
 
	show_binding(arg, key);
	return;
err:
	error_msg("expecting 2 arguments (context and key)\n");
}
 
static void cmd_quit(char *arg)
{
	if (!worker_has_job(JOB_TYPE_ANY) || yes_no_query("Tracks are being added. Quit and truncate playlist(s)? [y/N]"))
		cmus_running = 0;
}
 
static void cmd_reshuffle(char *arg)
{
	editable_lock();
	lib_reshuffle();
	pl_reshuffle();
	editable_unlock();
}
 
static void cmd_source(char *arg)
{
	char *filename = expand_filename(arg);
 
	if (source_file(filename) == -1)
		error_msg("sourcing %s: %s", filename, strerror(errno));
	free(filename);
}
 
static void cmd_colorscheme(char *arg)
{
	char filename[512];
 
	snprintf(filename, sizeof(filename), "%s/%s.theme", cmus_config_dir, arg);
	if (source_file(filename) == -1) {
		snprintf(filename, sizeof(filename), DATADIR "/cmus/%s.theme", arg);
		if (source_file(filename) == -1)
			error_msg("sourcing %s: %s", filename, strerror(errno));
	}
}
 
/*
 * \" inside double-quotes becomes "
 * \\ inside double-quotes becomes \
 */
static char *parse_quoted(const char **strp)
{
	const char *str = *strp;
	const char *start;
	char *ret, *dst;
 
	str++;
	start = str;
	while (1) {
		int c = *str++;
 
		if (c == 0)
			goto error;
		if (c == '"')
			break;
		if (c == '\\') {
			if (*str++ == 0)
				goto error;
		}
	}
	*strp = str;
	ret = xnew(char, str - start);
	str = start;
	dst = ret;
	while (1) {
		int c = *str++;
 
		if (c == '"')
			break;
		if (c == '\\') {
			c = *str++;
			if (c != '"' && c != '\\')
				*dst++ = '\\';
		}
		*dst++ = c;
	}
	*dst = 0;
	return ret;
error:
	error_msg("`\"' expected");
	return NULL;
}
 
static char *parse_escaped(const char **strp)
{
	const char *str = *strp;
	const char *start;
	char *ret, *dst;
 
	start = str;
	while (1) {
		int c = *str;
 
		if (c == 0 || c == ' ' || c == '\'' || c == '"')
			break;
 
		str++;
		if (c == '\\') {
			c = *str;
			if (c == 0)
				break;
			str++;
		}
	}
	*strp = str;
	ret = xnew(char, str - start + 1);
	str = start;
	dst = ret;
	while (1) {
		int c = *str;
 
		if (c == 0 || c == ' ' || c == '\'' || c == '"')
			break;
 
		str++;
		if (c == '\\') {
			c = *str;
			if (c == 0) {
				*dst++ = '\\';
				break;
			}
			str++;
		}
		*dst++ = c;
	}
	*dst = 0;
	return ret;
}
 
static char *parse_one(const char **strp)
{
	const char *str = *strp;
	char *ret = NULL;
 
	while (1) {
		char *part;
		int c = *str;
 
		if (!c || c == ' ')
			break;
		if (c == '"') {
			part = parse_quoted(&str);
			if (part == NULL)
				goto error;
		} else if (c == '\'') {
			/* backslashes are normal chars inside single-quotes */
			const char *end;
 
			str++;
			end = strchr(str, '\'');
			if (end == NULL)
				goto sq_missing;
			part = xstrndup(str, end - str);
			str = end + 1;
		} else {
			part = parse_escaped(&str);
		}
 
		if (ret == NULL) {
			ret = part;
		} else {
			char *tmp = xstrjoin(ret, part);
			free(ret);
			ret = tmp;
		}
	}
	*strp = str;
	return ret;
sq_missing:
	error_msg("`'' expected");
error:
	free(ret);
	return NULL;
}
 
static char **parse_cmd(const char *cmd, int *args_idx, int *ac)
{
	char **av = NULL;
	int nr = 0;
	int alloc = 0;
 
	while (*cmd) {
		char *arg;
 
		/* there can't be spaces at start of command
		 * and there is at least one argument */
		if (cmd[0] == '{' && cmd[1] == '}' && (cmd[2] == ' ' || cmd[2] == 0)) {
			/* {} is replaced with file arguments */
			if (*args_idx != -1)
				goto only_once_please;
			*args_idx = nr;
			cmd += 2;
			goto skip_spaces;
		} else {
			arg = parse_one(&cmd);
			if (arg == NULL)
				goto error;
		}
 
		if (nr == alloc) {
			alloc = alloc ? alloc * 2 : 4;
			av = xrenew(char *, av, alloc + 1);
		}
		av[nr++] = arg;
skip_spaces:
		while (*cmd == ' ')
			cmd++;
	}
	av[nr] = NULL;
	*ac = nr;
	return av;
only_once_please:
	error_msg("{} can be used only once");
error:
	while (nr > 0)
		free(av[--nr]);
	free(av);
	return NULL;
}
 
static struct track_info **sel_tis;
static int sel_tis_alloc;
static int sel_tis_nr;
 
static int add_ti(void *data, struct track_info *ti)
{
	if (sel_tis_nr == sel_tis_alloc) {
		sel_tis_alloc = sel_tis_alloc ? sel_tis_alloc * 2 : 8;
		sel_tis = xrenew(struct track_info *, sel_tis, sel_tis_alloc);
	}
	track_info_ref(ti);
	sel_tis[sel_tis_nr++] = ti;
	return 0;
}
 
static void cmd_run(char *arg)
{
	char **av, **argv;
	int ac, argc, i, run, files_idx = -1;
 
	if (cur_view > QUEUE_VIEW) {
		info_msg("Command execution is supported only in views 1-4");
		return;
	}
 
	av = parse_cmd(arg, &files_idx, &ac);
	if (av == NULL) {
		return;
	}
 
	/* collect selected files (struct track_info) */
	sel_tis = NULL;
	sel_tis_alloc = 0;
	sel_tis_nr = 0;
 
	editable_lock();
	switch (cur_view) {
	case TREE_VIEW:
		__tree_for_each_sel(add_ti, NULL, 0);
		break;
	case SORTED_VIEW:
		__editable_for_each_sel(&lib_editable, add_ti, NULL, 0);
		break;
	case PLAYLIST_VIEW:
		__editable_for_each_sel(&pl_editable, add_ti, NULL, 0);
		break;
	case QUEUE_VIEW:
		__editable_for_each_sel(&pq_editable, add_ti, NULL, 0);
		break;
	}
	editable_unlock();
 
	if (sel_tis_nr == 0) {
		/* no files selected, do nothing */
		free_str_array(av);
		return;
	}
	sel_tis[sel_tis_nr] = NULL;
 
	/* build argv */
	argv = xnew(char *, ac + sel_tis_nr + 1);
	argc = 0;
	if (files_idx == -1) {
		/* add selected files after rest of the args */
		for (i = 0; i < ac; i++)
			argv[argc++] = av[i];
		for (i = 0; i < sel_tis_nr; i++)
			argv[argc++] = sel_tis[i]->filename;
	} else {
		for (i = 0; i < files_idx; i++)
			argv[argc++] = av[i];
		for (i = 0; i < sel_tis_nr; i++)
			argv[argc++] = sel_tis[i]->filename;
		for (i = files_idx; i < ac; i++)
			argv[argc++] = av[i];
	}
	argv[argc] = NULL;
 
	for (i = 0; argv[i]; i++)
		d_print("ARG: '%s'\n", argv[i]);
 
	run = 1;
	if (confirm_run && (sel_tis_nr > 1 || strcmp(argv[0], "rm") == 0)) {
		if (!yes_no_query("Execute %s for the %d selected files? [y/N]", arg, sel_tis_nr)) {
			info_msg("Aborted");
			run = 0;
		}
	}
	if (run) {
		int status;
 
		if (spawn(argv, &status)) {
			error_msg("executing %s: %s", argv[0], strerror(errno));
		} else {
			if (WIFEXITED(status)) {
				int rc = WEXITSTATUS(status);
 
				if (rc)
					error_msg("%s returned %d", argv[0], rc);
			}
			if (WIFSIGNALED(status))
				error_msg("%s received signal %d", argv[0], WTERMSIG(status));
 
			switch (cur_view) {
			case TREE_VIEW:
			case SORTED_VIEW:
				/* this must be done before sel_tis are unreffed */
				free_str_array(av);
				free(argv);
 
				/* remove non-existed files, update tags for changed files */
				cmus_update_tis(sel_tis, sel_tis_nr);
 
				/* we don't own sel_tis anymore! */
				return;
			}
		}
	}
	free_str_array(av);
	free(argv);
	for (i = 0; sel_tis[i]; i++)
		track_info_unref(sel_tis[i]);
	free(sel_tis);
}
 
static int get_one_ti(void *data, struct track_info *ti)
{
	struct track_info **sel_ti = data;
 
	track_info_ref(ti);
	*sel_ti = ti;
	/* stop the for each loop, we need only the first selected track */
	return 1;
}
 
static void cmd_echo(char *arg)
{
	struct track_info *sel_ti;
	char *ptr = arg;
 
	while (1) {
		ptr = strchr(ptr, '{');
		if (ptr == NULL)
			break;
		if (ptr[1] == '}')
			break;
		ptr++;
	}
 
	if (ptr == NULL) {
		info_msg("%s", arg);
		return;
	}
 
	if (cur_view > QUEUE_VIEW) {
		info_msg("echo with {} in its arguments is supported only in views 1-4");
		return;
	}
 
	*ptr = 0;
	ptr += 2;
 
	/* get only the first selected track */
	sel_ti = NULL;
 
	editable_lock();
	switch (cur_view) {
	case TREE_VIEW:
		__tree_for_each_sel(get_one_ti, &sel_ti, 0);
		break;
	case SORTED_VIEW:
		__editable_for_each_sel(&lib_editable, get_one_ti, &sel_ti, 0);
		break;
	case PLAYLIST_VIEW:
		__editable_for_each_sel(&pl_editable, get_one_ti, &sel_ti, 0);
		break;
	case QUEUE_VIEW:
		__editable_for_each_sel(&pq_editable, get_one_ti, &sel_ti, 0);
		break;
	}
	editable_unlock();
 
	if (sel_ti == NULL)
		return;
 
	info_msg("%s%s%s", arg, sel_ti->filename, ptr);
	track_info_unref(sel_ti);
}
 
#define VF_RELATIVE	0x01
#define VF_PERCENTAGE	0x02
 
static int parse_vol_arg(const char *arg, int *value, unsigned int *flags)
{
	unsigned int f = 0;
	int ch, val = 0, digits = 0, sign = 1;
 
	if (*arg == '-') {
		arg++;
		f |= VF_RELATIVE;
		sign = -1;
	} else if (*arg == '+') {
		arg++;
		f |= VF_RELATIVE;
	}
 
	while (1) {
		ch = *arg++;
		if (ch < '0' || ch > '9')
			break;
		val *= 10;
		val += ch - '0';
		digits++;
	}
	if (digits == 0)
		goto err;
 
	if (ch == '%') {
		f |= VF_PERCENTAGE;
		ch = *arg;
	}
	if (ch)
		goto err;
 
	*value = sign * val;
	*flags = f;
	return 0;
err:
	return -1;
}
 
static int calc_vol(int val, int old, int max_vol, unsigned int flags)
{
	if (flags & VF_RELATIVE) {
		if (flags & VF_PERCENTAGE)
			val = scale_from_percentage(val, max_vol);
		val += old;
	} else if (flags & VF_PERCENTAGE) {
		val = scale_from_percentage(val, max_vol);
	}
	return clamp(val, 0, max_vol);
}
 
/*
 * :vol value [value]
 *
 * where value is [-+]?[0-9]+%?
 */
static void cmd_vol(char *arg)
{
	char **values = get_words(arg);
	unsigned int lf, rf;
	int l, r;
 
	if (values[1] && values[2])
		goto err;
 
	if (parse_vol_arg(values[0], &l, &lf))
		goto err;
 
	r = l;
	rf = lf;
	if (values[1] && parse_vol_arg(values[1], &r, &rf))
		goto err;
 
	free_str_array(values);
 
	if (soft_vol) {
		l = calc_vol(l, soft_vol_l, 100, lf);
		r = calc_vol(r, soft_vol_r, 100, rf);
		player_set_soft_volume(l, r);
	} else {
		mixer_read_volume();
		l = calc_vol(l, volume_l, volume_max, lf);
		r = calc_vol(r, volume_r, volume_max, rf);
		mixer_set_volume(l, r);
	}
	update_statusline();
	return;
err:
	free_str_array(values);
	error_msg("expecting 1 or 2 arguments (total or L and R volumes [+-]INTEGER[%%])\n");
}
 
static void cmd_prev_view(char *arg)
{
	int tmp;
	if (prev_view >= 0) {
		tmp = cur_view;
		set_view(prev_view);
		prev_view = tmp;
	}
}
 
static void cmd_view(char *arg)
{
	int view;
 
	if (parse_enum(arg, 1, NR_VIEWS, view_names, &view) && (view - 1) != cur_view) {
		prev_view = cur_view;
		set_view(view - 1);
	}
}
 
static void cmd_p_next(char *arg)
{
	cmus_next();
}
 
static void cmd_p_pause(char *arg)
{
	player_pause();
}
 
static void cmd_p_play(char *arg)
{
	if (arg) {
		cmus_play_file(arg);
	} else {
		player_play();
	}
}
 
static void cmd_p_prev(char *arg)
{
	cmus_prev();
}
 
static void cmd_p_stop(char *arg)
{
	player_stop();
}
 
static void cmd_search_next(char *arg)
{
	if (search_str) {
		if (!search_next(searchable, search_str, search_direction))
			search_not_found();
	}
}
 
static void cmd_search_prev(char *arg)
{
	if (search_str) {
		if (!search_next(searchable, search_str, !search_direction))
			search_not_found();
	}
}
 
static int sorted_for_each_sel(int (*cb)(void *data, struct track_info *ti), void *data, int reverse)
{
	return editable_for_each_sel(&lib_editable, cb, data, reverse);
}
 
static int pl_for_each_sel(int (*cb)(void *data, struct track_info *ti), void *data, int reverse)
{
	return editable_for_each_sel(&pl_editable, cb, data, reverse);
}
 
static int pq_for_each_sel(int (*cb)(void *data, struct track_info *ti), void *data, int reverse)
{
	return editable_for_each_sel(&pq_editable, cb, data, reverse);
}
 
static for_each_sel_ti_cb view_for_each_sel[4] = {
	tree_for_each_sel,
	sorted_for_each_sel,
	pl_for_each_sel,
	pq_for_each_sel
};
 
/* wrapper for void lib_add_track(struct track_info *) etc. */
static int wrapper_cb(void *data, struct track_info *ti)
{
	add_ti_cb add = data;
 
	add(ti);
	return 0;
}
 
static void add_from_browser(add_ti_cb add, int job_type)
{
	char *sel = browser_get_sel();
 
	if (sel) {
		enum file_type ft;
		char *ret;
 
		ft = cmus_detect_ft(sel, &ret);
		if (ft != FILE_TYPE_INVALID) {
			cmus_add(add, ret, ft, job_type);
			window_down(browser_win, 1);
		}
		free(ret);
		free(sel);
	}
}
 
static void cmd_win_add_l(char *arg)
{
	if (cur_view == TREE_VIEW || cur_view == SORTED_VIEW)
		return;
 
	if (cur_view <= QUEUE_VIEW) {
		editable_lock();
		view_for_each_sel[cur_view](wrapper_cb, lib_add_track, 0);
		editable_unlock();
	} else if (cur_view == BROWSER_VIEW) {
		add_from_browser(lib_add_track, JOB_TYPE_LIB);
	}
}
 
static void cmd_win_add_p(char *arg)
{
	/* could allow adding dups? */
	if (cur_view == PLAYLIST_VIEW)
		return;
 
	if (cur_view <= QUEUE_VIEW) {
		editable_lock();
		view_for_each_sel[cur_view](wrapper_cb, pl_add_track, 0);
		editable_unlock();
	} else if (cur_view == BROWSER_VIEW) {
		add_from_browser(pl_add_track, JOB_TYPE_PL);
	}
}
 
static void cmd_win_add_Q(char *arg)
{
	if (cur_view == QUEUE_VIEW)
		return;
 
	if (cur_view <= QUEUE_VIEW) {
		editable_lock();
		view_for_each_sel[cur_view](wrapper_cb, play_queue_prepend, 1);
		editable_unlock();
	} else if (cur_view == BROWSER_VIEW) {
		add_from_browser(play_queue_prepend, JOB_TYPE_QUEUE);
	}
}
 
static void cmd_win_add_q(char *arg)
{
	if (cur_view == QUEUE_VIEW)
		return;
 
	if (cur_view <= QUEUE_VIEW) {
		editable_lock();
		view_for_each_sel[cur_view](wrapper_cb, play_queue_append, 0);
		editable_unlock();
	} else if (cur_view == BROWSER_VIEW) {
		add_from_browser(play_queue_append, JOB_TYPE_QUEUE);
	}
}
 
static void cmd_win_activate(char *arg)
{
	struct track_info *info = NULL;
 
	editable_lock();
	switch (cur_view) {
	case TREE_VIEW:
		info = tree_set_selected();
		break;
	case SORTED_VIEW:
		info = sorted_set_selected();
		break;
	case PLAYLIST_VIEW:
		info = pl_set_selected();
		break;
	case QUEUE_VIEW:
		break;
	case BROWSER_VIEW:
		browser_enter();
		break;
	case FILTERS_VIEW:
		filters_activate();
		break;
	case HELP_VIEW:
		help_select();
		break;
	}
	editable_unlock();
 
	if (info) {
		/* update lib/pl mode */
		if (cur_view < 2)
			play_library = 1;
		if (cur_view == 2)
			play_library = 0;
 
		player_play_file(info);
	}
}
 
static void cmd_win_mv_after(char *arg)
{
	editable_lock();
	switch (cur_view) {
	case TREE_VIEW:
		break;
	case SORTED_VIEW:
		editable_move_after(&lib_editable);
		break;
	case PLAYLIST_VIEW:
		editable_move_after(&pl_editable);
		break;
	case QUEUE_VIEW:
		editable_move_after(&pq_editable);
		break;
	case BROWSER_VIEW:
		break;
	case FILTERS_VIEW:
		break;
	case HELP_VIEW:
		break;
	}
	editable_unlock();
}
 
static void cmd_win_mv_before(char *arg)
{
	editable_lock();
	switch (cur_view) {
	case TREE_VIEW:
		break;
	case SORTED_VIEW:
		editable_move_before(&lib_editable);
		break;
	case PLAYLIST_VIEW:
		editable_move_before(&pl_editable);
		break;
	case QUEUE_VIEW:
		editable_move_before(&pq_editable);
		break;
	case BROWSER_VIEW:
		break;
	case FILTERS_VIEW:
		break;
	case HELP_VIEW:
		break;
	}
	editable_unlock();
}
 
static void cmd_win_remove(char *arg)
{
	editable_lock();
	switch (cur_view) {
	case TREE_VIEW:
		tree_remove_sel();
		break;
	case SORTED_VIEW:
		editable_remove_sel(&lib_editable);
		break;
	case PLAYLIST_VIEW:
		editable_remove_sel(&pl_editable);
		break;
	case QUEUE_VIEW:
		editable_remove_sel(&pq_editable);
		break;
	case BROWSER_VIEW:
		browser_delete();
		break;
	case FILTERS_VIEW:
		filters_delete_filter();
		break;
	case HELP_VIEW:
		help_remove();
		break;
	}
	editable_unlock();
}
 
static void cmd_win_sel_cur(char *arg)
{
	editable_lock();
	switch (cur_view) {
	case TREE_VIEW:
		tree_sel_current();
		break;
	case SORTED_VIEW:
		sorted_sel_current();
		break;
	case PLAYLIST_VIEW:
		pl_sel_current();
		break;
	case QUEUE_VIEW:
		break;
	case BROWSER_VIEW:
		break;
	case FILTERS_VIEW:
		break;
	case HELP_VIEW:
		break;
	}
	editable_unlock();
}
 
static void cmd_win_toggle(char *arg)
{
	switch (cur_view) {
	case TREE_VIEW:
		editable_lock();
		tree_toggle_expand_artist();
		editable_unlock();
		break;
	case SORTED_VIEW:
		editable_lock();
		editable_toggle_mark(&lib_editable);
		editable_unlock();
		break;
	case PLAYLIST_VIEW:
		editable_lock();
		editable_toggle_mark(&pl_editable);
		editable_unlock();
		break;
	case QUEUE_VIEW:
		editable_lock();
		editable_toggle_mark(&pq_editable);
		editable_unlock();
		break;
	case BROWSER_VIEW:
		break;
	case FILTERS_VIEW:
		filters_toggle_filter();
		break;
	case HELP_VIEW:
		help_toggle();
		break;
	}
}
 
static struct window *current_win(void)
{
	switch (cur_view) {
	case TREE_VIEW:
		return lib_cur_win;
	case SORTED_VIEW:
		return lib_editable.win;
	case PLAYLIST_VIEW:
		return pl_editable.win;
	case QUEUE_VIEW:
		return pq_editable.win;
	case BROWSER_VIEW:
		return browser_win;
	case HELP_VIEW:
		return help_win;
	case FILTERS_VIEW:
	default:
		return filters_win;
	}
}
 
static void cmd_win_bottom(char *arg)
{
	editable_lock();
	window_goto_bottom(current_win());
	editable_unlock();
}
 
static void cmd_win_down(char *arg)
{
	editable_lock();
	window_down(current_win(), 1);
	editable_unlock();
}
 
static void cmd_win_next(char *arg)
{
	if (cur_view == TREE_VIEW) {
		editable_lock();
		tree_toggle_active_window();
		editable_unlock();
	}
}
 
static void cmd_win_pg_down(char *arg)
{
	editable_lock();
	window_page_down(current_win());
	editable_unlock();
}
 
static void cmd_win_pg_up(char *arg)
{
	editable_lock();
	window_page_up(current_win());
	editable_unlock();
}
 
static void cmd_win_top(char *arg)
{
	editable_lock();
	window_goto_top(current_win());
	editable_unlock();
}
 
static void cmd_win_up(char *arg)
{
	editable_lock();
	window_up(current_win(), 1);
	editable_unlock();
}
 
static void cmd_win_update(char *arg)
{
	switch (cur_view) {
	case TREE_VIEW:
	case SORTED_VIEW:
		cmus_update_lib();
		break;
	case BROWSER_VIEW:
		browser_reload();
		break;
	}
}
 
static void cmd_browser_up(char *arg)
{
	browser_up();
}
 
static void cmd_refresh(char *arg)
{
	clearok(curscr, TRUE);
	refresh();
}
 
static int cmp_intp(const void *ap, const void *bp)
{
	int a = *(int *)ap;
	int b = *(int *)bp;
	return a - b;
}
 
static int *rand_array(int size, int nmax)
{
	int *r = xnew(int, size + 1);
	int i, offset = 0;
	int count = size;
 
	if (count > nmax / 2) {
		/*
		 * Imagine that there are 1000 tracks in library and we want to
		 * add 998 random tracks to queue.  After we have added 997
		 * random numbers to the array it would be quite hard to find a
		 * random number that isn't already in the array (3/1000
		 * probability).
		 *
		 * So we invert the logic:
		 *
		 * Find two (1000 - 998) random numbers in 0..999 range and put
		 * them at end of the array.  Sort the numbers and then fill
		 * the array starting at index 0 with incrementing values that
		 * are not in the set of random numbers.
		 */
		count = nmax - count;
		offset = size - count;
	}
 
	for (i = 0; i < count; ) {
		int v, j;
found:
		v = rand() % nmax;
		for (j = 0; j < i; j++) {
			if (r[offset + j] == v)
				goto found;
		}
		r[offset + i++] = v;
	}
	qsort(r + offset, count, sizeof(*r), cmp_intp);
 
	if (offset) {
		int j, n;
 
		/* simplifies next loop */
		r[size] = nmax;
 
		/* convert the indexes we don't want to those we want */
		i = 0;
		j = offset;
		n = 0;
		do {
			while (n < r[j])
				r[i++] = n++;
			j++;
			n++;
		} while (i < size);
	}
	return r;
}
 
static int count_albums(void)
{
	struct artist *artist;
	struct list_head *item;
	int count = 0;
 
	list_for_each_entry(artist, &lib_artist_head, node) {
		list_for_each(item, &artist->album_head)
			count++;
	}
	return count;
}
 
struct album_list {
	struct list_head node;
	const struct album *album;
};
 
static void cmd_lqueue(char *arg)
{
	LIST_HEAD(head);
	const struct list_head *item;
	const struct album *album;
	int count = 1, nmax, i, pos;
	int *r;
 
	if (arg) {
		long int val;
 
		if (str_to_int(arg, &val) || val <= 0) {
			error_msg("argument must be positive integer");
			return;
		}
		count = val;
	}
	editable_lock();
	nmax = count_albums();
	if (count > nmax)
		count = nmax;
	if (!count)
		goto unlock;
 
	r = rand_array(count, nmax);
	album = to_album(to_artist(lib_artist_head.next)->album_head.next);
	pos = 0;
	for (i = 0; i < count; i++) {
		struct album_list *a;
 
		while (pos < r[i]) {
			struct artist *artist = album->artist;
			if (album->node.next == &artist->album_head) {
				artist = to_artist(artist->node.next);
				album = to_album(artist->album_head.next);
			} else {
				album = to_album(album->node.next);
			}
			pos++;
		}
		a = xnew(struct album_list, 1);
		a->album = album;
		list_add_rand(&head, &a->node, i);
	}
	free(r);
 
	item = head.next;
	do {
		struct list_head *next = item->next;
		struct album_list *a = container_of(item, struct album_list, node);
		struct tree_track *t;
 
		list_for_each_entry(t, &a->album->track_head, node)
			editable_add(&pq_editable, simple_track_new(tree_track_info(t)));
		free(a);
		item = next;
	} while (item != &head);
unlock:
	editable_unlock();
}
 
static void cmd_tqueue(char *arg)
{
	LIST_HEAD(head);
	struct list_head *item;
	int count = 1, i, pos;
	int *r;
 
	if (arg) {
		long int val;
 
		if (str_to_int(arg, &val) || val <= 0) {
			error_msg("argument must be positive integer");
			return;
		}
		count = val;
	}
	editable_lock();
	if (count > lib_editable.nr_tracks)
		count = lib_editable.nr_tracks;
	if (!count)
		goto unlock;
 
	r = rand_array(count, lib_editable.nr_tracks);
	item = lib_editable.head.next;
	pos = 0;
	for (i = 0; i < count; i++) {
		struct simple_track *t;
 
		while (pos < r[i]) {
			item = item->next;
			pos++;
		}
		t = simple_track_new(to_simple_track(item)->info);
		list_add_rand(&head, &t->node, i);
	}
	free(r);
 
	item = head.next;
	do {
		struct list_head *next = item->next;
		struct simple_track *t = to_simple_track(item);
		editable_add(&pq_editable, t);
		item = next;
	} while (item != &head);
unlock:
	editable_unlock();
}
 
/* tab exp {{{
 *
 * these functions fill tabexp struct, which is resetted beforehand
 */
 
/* buffer used for tab expansion */
static char expbuf[512];
 
static int filter_directories(const char *name, const struct stat *s)
{
	return S_ISDIR(s->st_mode);
}
 
static int filter_any(const char *name, const struct stat *s)
{
	return 1;
}
 
static int filter_playable(const char *name, const struct stat *s)
{
	return S_ISDIR(s->st_mode) || cmus_is_playable(name);
}
 
static int filter_playlist(const char *name, const struct stat *s)
{
	return S_ISDIR(s->st_mode) || cmus_is_playlist(name);
}
 
static int filter_supported(const char *name, const struct stat *s)
{
	return S_ISDIR(s->st_mode) || cmus_is_supported(name);
}
 
static void expand_files(const char *str)
{
	expand_files_and_dirs(str, filter_any);
}
 
static void expand_directories(const char *str)
{
	expand_files_and_dirs(str, filter_directories);
}
 
static void expand_playable(const char *str)
{
	expand_files_and_dirs(str, filter_playable);
}
 
static void expand_playlist(const char *str)
{
	expand_files_and_dirs(str, filter_playlist);
}
 
static void expand_supported(const char *str)
{
	expand_files_and_dirs(str, filter_supported);
}
 
static void expand_add(const char *str)
{
	int flag = parse_flags(&str, "lpqQ");
 
	if (flag == -1)
		return;
	if (str == NULL)
		str = "";
	expand_supported(str);
 
	if (tabexp.head && flag) {
		snprintf(expbuf, sizeof(expbuf), "-%c %s", flag, tabexp.head);
		free(tabexp.head);
		tabexp.head = xstrdup(expbuf);
	}
}
 
static void expand_load_save(const char *str)
{
	int flag = parse_flags(&str, "lp");
 
	if (flag == -1)
		return;
	if (str == NULL)
		str = "";
	expand_playlist(str);
 
	if (tabexp.head && flag) {
		snprintf(expbuf, sizeof(expbuf), "-%c %s", flag, tabexp.head);
		free(tabexp.head);
		tabexp.head = xstrdup(expbuf);
	}
}
 
static void expand_key_context(const char *str, const char *force)
{
	int pos, i, len = strlen(str);
	char **tails;
 
	tails = xnew(char *, NR_CTXS + 1);
	pos = 0;
	for (i = 0; key_context_names[i]; i++) {
		int cmp = strncmp(str, key_context_names[i], len);
		if (cmp > 0)
			continue;
		if (cmp < 0)
			break;
		tails[pos++] = xstrdup(key_context_names[i] + len);
	}
 
	if (pos == 0) {
		free(tails);
		return;
	}
	if (pos == 1) {
		char *tmp = xstrjoin(tails[0], " ");
		free(tails[0]);
		tails[0] = tmp;
	}
	tails[pos] = NULL;
	snprintf(expbuf, sizeof(expbuf), "%s%s", force, str);
	tabexp.head = xstrdup(expbuf);
	tabexp.tails = tails;
}
 
static int get_context(const char *str, int len)
{
	int i, c = -1, count = 0;
 
	for (i = 0; key_context_names[i]; i++) {
		if (strncmp(str, key_context_names[i], len) == 0) {
			if (key_context_names[i][len] == 0) {
				/* exact */
				return i;
			}
			c = i;
			count++;
		}
	}
	if (count == 1)
		return c;
	return -1;
}
 
static void expand_command_line(const char *str);
 
static void expand_bind_args(const char *str)
{
	/* :bind context key function
	 *
	 * possible values for str:
	 *   c
	 *   context k
	 *   context key f
	 *
	 * you need to know context before you can expand function
	 */
	/* start and end pointers for context, key and function */
	const char *cs, *ce, *ks, *ke, *fs;
	int i, c, k, count;
	int flag = parse_flags((const char **)&str, "f");
	const char *force = "";
 
	if (flag == -1)
		return;
	if (str == NULL)
		str = "";
 
	if (flag == 'f')
		force = "-f ";
 
	cs = str;
	ce = strchr(cs, ' ');
	if (ce == NULL) {
		expand_key_context(cs, force);
		return;
	}
 
	/* context must be expandable */
	c = get_context(cs, ce - cs);
	if (c == -1) {
		/* context is ambiguous or invalid */
		return;
	}
 
	ks = ce;
	while (*ks == ' ')
		ks++;
	ke = strchr(ks, ' ');
	if (ke == NULL) {
		/* expand key */
		int len = strlen(ks);
		PTR_ARRAY(array);
 
		for (i = 0; key_table[i].name; i++) {
			int cmp = strncmp(ks, key_table[i].name, len);
			if (cmp > 0)
				continue;
			if (cmp < 0)
				break;
			ptr_array_add(&array, xstrdup(key_table[i].name + len));
		}
 
		if (!array.count)
			return;
 
		if (array.count == 1) {
			char **ptrs = array.ptrs;
			char *tmp = xstrjoin(ptrs[0], " ");
			free(ptrs[0]);
			ptrs[0] = tmp;
		}
 
		snprintf(expbuf, sizeof(expbuf), "%s%s %s", force, key_context_names[c], ks);
 
		ptr_array_plug(&array);
		tabexp.head = xstrdup(expbuf);
		tabexp.tails = array.ptrs;
		return;
	}
 
	/* key must be expandable */
	k = -1;
	count = 0;
	for (i = 0; key_table[i].name; i++) {
		if (strncmp(ks, key_table[i].name, ke - ks) == 0) {
			if (key_table[i].name[ke - ks] == 0) {
				/* exact */
				k = i;
				count = 1;
				break;
			}
			k = i;
			count++;
		}
	}
	if (count != 1) {
		/* key is ambiguous or invalid */
		return;
	}
 
	fs = ke;
	while (*fs == ' ')
		fs++;
 
	if (*fs == ':')
		fs++;
 
	/* expand com [arg...] */
	expand_command_line(fs);
	if (tabexp.head == NULL) {
		/* command expand failed */
		return;
	}
 
	/*
	 * tabexp.head is now "com"
	 * tabexp.tails is [ mand1 mand2 ... ]
	 *
	 * need to change tabexp.head to "context key com"
	 */
 
	snprintf(expbuf, sizeof(expbuf), "%s%s %s %s", force, key_context_names[c],
			key_table[k].name, tabexp.head);
	free(tabexp.head);
	tabexp.head = xstrdup(expbuf);
}
 
static void expand_unbind_args(const char *str)
{
	/* :unbind context key */
	/* start and end pointers for context and key */
	const char *cs, *ce, *ks;
	const struct binding *b;
	PTR_ARRAY(array);
	int c, len;
 
	cs = str;
	ce = strchr(cs, ' ');
	if (ce == NULL) {
		expand_key_context(cs, "");
		return;
	}
 
	/* context must be expandable */
	c = get_context(cs, ce - cs);
	if (c == -1) {
		/* context is ambiguous or invalid */
		return;
	}
 
	ks = ce;
	while (*ks == ' ')
		ks++;
 
	/* expand key */
	len = strlen(ks);
	b = key_bindings[c];
	while (b) {
		if (!strncmp(ks, b->key->name, len))
			ptr_array_add(&array, xstrdup(b->key->name + len));
		b = b->next;
	}
	if (!array.count)
		return;
 
	snprintf(expbuf, sizeof(expbuf), "%s %s", key_context_names[c], ks);
 
	ptr_array_plug(&array);
	tabexp.head = xstrdup(expbuf);
	tabexp.tails = array.ptrs;
}
 
static void expand_factivate(const char *str)
{
	/* "name1 name2 name3", expand only name3 */
	struct filter_entry *e;
	const char *name;
	PTR_ARRAY(array);
	int str_len, len, i;
 
	str_len = strlen(str);
	i = str_len;
	while (i > 0) {
		if (str[i - 1] == ' ')
			break;
		i--;
	}
	len = str_len - i;
	name = str + i;
 
	list_for_each_entry(e, &filters_head, node) {
		if (!strncmp(name, e->name, len))
			ptr_array_add(&array, xstrdup(e->name + len));
	}
	if (!array.count)
		return;
 
	ptr_array_plug(&array);
	tabexp.head = xstrdup(str);
	tabexp.tails = array.ptrs;
}
 
static void expand_options(const char *str)
{
	struct cmus_opt *opt;
	int len;
	char **tails;
 
	/* tabexp is resetted */
	len = strlen(str);
	if (len > 1 && str[len - 1] == '=') {
		/* expand value */
		char *var = xstrndup(str, len - 1);
 
		list_for_each_entry(opt, &option_head, node) {
			if (strcmp(var, opt->name) == 0) {
				char buf[OPTION_MAX_SIZE];
 
				tails = xnew(char *, 2);
 
				buf[0] = 0;
				opt->get(opt->id, buf);
				tails[0] = xstrdup(buf);
				tails[1] = NULL;
 
				tabexp.head = xstrdup(str);
				tabexp.tails = tails;
				free(var);
				return;
			}
		}
		free(var);
	} else {
		/* expand variable */
		int pos;
 
		tails = xnew(char *, nr_options + 1);
		pos = 0;
		list_for_each_entry(opt, &option_head, node) {
			if (strncmp(str, opt->name, len) == 0)
				tails[pos++] = xstrdup(opt->name + len);
		}
		if (pos > 0) {
			if (pos == 1) {
				/* only one variable matches, add '=' */
				char *tmp = xstrjoin(tails[0], "=");
 
				free(tails[0]);
				tails[0] = tmp;
			}
 
			tails[pos] = NULL;
			tabexp.head = xstrdup(str);
			tabexp.tails = tails;
		} else {
			free(tails);
		}
	}
}
 
static void expand_toptions(const char *str)
{
	struct cmus_opt *opt;
	int len, pos;
	char **tails;
 
	tails = xnew(char *, nr_options + 1);
	len = strlen(str);
	pos = 0;
	list_for_each_entry(opt, &option_head, node) {
		if (opt->toggle == NULL)
			continue;
		if (strncmp(str, opt->name, len) == 0)
			tails[pos++] = xstrdup(opt->name + len);
	}
	if (pos > 0) {
		tails[pos] = NULL;
		tabexp.head = xstrdup(str);
		tabexp.tails = tails;
	} else {
		free(tails);
	}
}
 
static void load_themes(const char *dirname, const char *str, struct ptr_array *array)
{
	struct directory dir;
	const char *name, *dot;
	int len = strlen(str);
 
	if (dir_open(&dir, dirname))
		return;
 
	while ((name = dir_read(&dir))) {
		if (!S_ISREG(dir.st.st_mode))
			continue;
		if (strncmp(name, str, len))
			continue;
		dot = strrchr(name, '.');
		if (dot == NULL || strcmp(dot, ".theme"))
			continue;
		if (dot - name < len)
			/* str is  "foo.th"
			 * matches "foo.theme"
			 * which also ends with ".theme"
			 */
			continue;
		ptr_array_add(array, xstrndup(name + len, dot - name - len));
	}
	dir_close(&dir);
}
 
static void expand_colorscheme(const char *str)
{
	PTR_ARRAY(array);
 
	load_themes(cmus_config_dir, str, &array);
	load_themes(DATADIR "/cmus", str, &array);
 
	if (array.count) {
		ptr_array_sort(&array, strptrcmp);
 
		ptr_array_plug(&array);
		tabexp.head = xstrdup(str);
		tabexp.tails = array.ptrs;
	}
}
 
/* tab exp }}} */
 
/* sort by name */
struct command commands[] = {
	{ "add",		cmd_add,	1, 1, expand_add,	  0, 0 },
	{ "bind",		cmd_bind,	1, 1, expand_bind_args,	  0, CMD_UNSAFE },
	{ "browser-up",		cmd_browser_up,	0, 0, NULL,		  0, 0 },
	{ "cd",			cmd_cd,		0, 1, expand_directories, 0, 0 },
	{ "clear",		cmd_clear,	0, 1, NULL,		  0, 0 },
	{ "colorscheme",	cmd_colorscheme,1, 1, expand_colorscheme, 0, 0 },
	{ "echo",		cmd_echo,	1,-1, NULL,		  0, 0 },
	{ "factivate",		cmd_factivate,	0, 1, expand_factivate,	  0, 0 },
	{ "filter",		cmd_filter,	0, 1, NULL,		  0, 0 },
	{ "fset",		cmd_fset,	1, 1, NULL,		  0, 0 },
	{ "invert",		cmd_invert,	0, 0, NULL,		  0, 0 },
	{ "load",		cmd_load,	1, 1, expand_load_save,	  0, 0 },
	{ "lqueue",		cmd_lqueue,	0, 1, NULL,		  0, 0 },
	{ "mark",		cmd_mark,	0, 1, NULL,		  0, 0 },
	{ "player-next",	cmd_p_next,	0, 0, NULL,		  0, 0 },
	{ "player-pause",	cmd_p_pause,	0, 0, NULL,		  0, 0 },
	{ "player-play",	cmd_p_play,	0, 1, expand_playable,	  0, 0 },
	{ "player-prev",	cmd_p_prev,	0, 0, NULL,		  0, 0 },
	{ "player-stop",	cmd_p_stop,	0, 0, NULL,		  0, 0 },
	{ "prev-view",  	cmd_prev_view,	0, 0, NULL,		  0, 0 },
	{ "quit",		cmd_quit,	0, 0, NULL,		  0, 0 },
	{ "refresh",		cmd_refresh,	0, 0, NULL,		  0, 0 },
	{ "run",		cmd_run,	1,-1, NULL,		  0, CMD_UNSAFE },
	{ "save",		cmd_save,	0, 1, expand_load_save,	  0, CMD_UNSAFE },
	{ "search-next",	cmd_search_next,0, 0, NULL,		  0, 0 },
	{ "search-prev",	cmd_search_prev,0, 0, NULL,		  0, 0 },
	{ "seek",		cmd_seek,	1, 1, NULL,		  0, 0 },
	{ "set",		cmd_set,	1, 1, expand_options,	  0, 0 },
	{ "showbind",		cmd_showbind,	1, 1, expand_unbind_args, 0, 0 },
	{ "shuffle",		cmd_reshuffle,	0, 0, NULL,		  0, 0 },
	{ "source",		cmd_source,	1, 1, expand_files,	  0, CMD_UNSAFE },
	{ "toggle",		cmd_toggle,	1, 1, expand_toptions,	  0, 0 },
	{ "tqueue",		cmd_tqueue,	0, 1, NULL,		  0, 0 },
	{ "unbind",		cmd_unbind,	1, 1, expand_unbind_args, 0, 0 },
	{ "unmark",		cmd_unmark,	0, 0, NULL,		  0, 0 },
	{ "update-cache",	cmd_update_cache,0, 0, NULL,		  0, 0 },
	{ "view",		cmd_view,	1, 1, NULL,		  0, 0 },
	{ "vol",		cmd_vol,	1, 2, NULL,		  0, 0 },
	{ "win-activate",	cmd_win_activate,0, 0, NULL,		  0, 0 },
	{ "win-add-l",		cmd_win_add_l,	0, 0, NULL,		  0, 0 },
	{ "win-add-p",		cmd_win_add_p,	0, 0, NULL,		  0, 0 },
	{ "win-add-Q",		cmd_win_add_Q,	0, 0, NULL,		  0, 0 },
	{ "win-add-q",		cmd_win_add_q,	0, 0, NULL,		  0, 0 },
	{ "win-bottom",		cmd_win_bottom,	0, 0, NULL,		  0, 0 },
	{ "win-down",		cmd_win_down,	0, 0, NULL,		  0, 0 },
	{ "win-mv-after",	cmd_win_mv_after,0, 0, NULL,		  0, 0 },
	{ "win-mv-before",	cmd_win_mv_before,0, 0, NULL,		  0, 0 },
	{ "win-next",		cmd_win_next,	0, 0, NULL,		  0, 0 },
	{ "win-page-down",	cmd_win_pg_down,0, 0, NULL,		  0, 0 },
	{ "win-page-up",	cmd_win_pg_up,	0, 0, NULL,		  0, 0 },
	{ "win-remove",		cmd_win_remove,	0, 0, NULL,		  0, CMD_UNSAFE },
	{ "win-sel-cur",	cmd_win_sel_cur,0, 0, NULL,		  0, 0 },
	{ "win-toggle",		cmd_win_toggle,	0, 0, NULL,		  0, 0 },
	{ "win-top",		cmd_win_top,	0, 0, NULL,		  0, 0 },
	{ "win-up",		cmd_win_up,	0, 0, NULL,		  0, 0 },
	{ "win-update",		cmd_win_update,	0, 0, NULL,		  0, 0 },
	{ NULL,			NULL,		0, 0, 0,		  0, 0 }
};
 
/* fills tabexp struct */
static void expand_commands(const char *str)
{
	int i, len, pos;
	char **tails;
 
	/* tabexp is resetted */
	tails = xnew(char *, sizeof(commands) / sizeof(struct command));
	len = strlen(str);
	pos = 0;
	for (i = 0; commands[i].name; i++) {
		if (strncmp(str, commands[i].name, len) == 0)
			tails[pos++] = xstrdup(commands[i].name + len);
	}
	if (pos > 0) {
		if (pos == 1) {
			/* only one command matches, add ' ' */
			char *tmp = xstrjoin(tails[0], " ");
 
			free(tails[0]);
			tails[0] = tmp;
		}
		tails[pos] = NULL;
		tabexp.head = xstrdup(str);
		tabexp.tails = tails;
	} else {
		free(tails);
	}
}
 
struct command *get_command(const char *str)
{
	int i, len;
 
	while (*str == ' ')
		str++;
	for (len = 0; str[len] && str[len] != ' '; len++)
		;
 
	for (i = 0; commands[i].name; i++) {
		if (strncmp(str, commands[i].name, len))
			continue;
 
		if (commands[i].name[len] == 0) {
			/* exact */
			return &commands[i];
		}
 
		if (commands[i + 1].name && strncmp(str, commands[i + 1].name, len) == 0) {
			/* ambiguous */
			return NULL;
		}
		return &commands[i];
	}
	return NULL;
}
 
/* fills tabexp struct */
static void expand_command_line(const char *str)
{
	/* :command [arg]...
	 *
	 * examples:
	 *
	 * str      expanded value (tabexp.head)
	 * -------------------------------------
	 *   fs     fset
	 *   b c    bind common
	 *   se     se          (tabexp.tails = [ ek t ])
	 */
	/* command start/end, argument start */
	const char *cs, *ce, *as;
	const struct command *cmd;
 
	cs = str;
	ce = strchr(cs, ' ');
	if (ce == NULL) {
		/* expand command */
		expand_commands(cs);
		return;
	}
 
	/* command must be expandable */
	cmd = get_command(cs);
	if (cmd == NULL) {
		/* command ambiguous or invalid */
		return;
	}
 
	if (cmd->expand == NULL) {
		/* can't expand argument */
		return;
	}
 
	as = ce;
	while (*as == ' ')
		as++;
 
	/* expand argument */
	cmd->expand(as);
	if (tabexp.head == NULL) {
		/* argument expansion failed */
		return;
	}
 
	/* tabexp.head is now start of the argument string */
	snprintf(expbuf, sizeof(expbuf), "%s %s", cmd->name, tabexp.head);
	free(tabexp.head);
	tabexp.head = xstrdup(expbuf);
}
 
static void tab_expand(void)
{
	char *s1, *s2, *tmp;
	int pos;
 
	/* strip white space */
	pos = 0;
	while (cmdline.line[pos] == ' ' && pos < cmdline.bpos)
		pos++;
 
	/* string to expand */
	s1 = xstrndup(cmdline.line + pos, cmdline.bpos - pos);
 
	/* tail */
	s2 = xstrdup(cmdline.line + cmdline.bpos);
 
	tmp = tabexp_expand(s1, expand_command_line);
	if (tmp) {
		/* tmp.s2 */
		int l1, l2;
 
		l1 = strlen(tmp);
		l2 = strlen(s2);
		cmdline.blen = l1 + l2;
		if (cmdline.blen >= cmdline.size) {
			while (cmdline.blen >= cmdline.size)
				cmdline.size *= 2;
			cmdline.line = xrenew(char, cmdline.line, cmdline.size);
		}
		sprintf(cmdline.line, "%s%s", tmp, s2);
		cmdline.bpos = l1;
		cmdline.cpos = u_strlen(tmp);
		cmdline.clen = u_strlen(cmdline.line);
		free(tmp);
	}
	free(s1);
	free(s2);
}
 
static void reset_tab_expansion(void)