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Rewrite of the target resolution internals to be simpler and more
consistent but with much less duplication, but keeping the same internal
API. Also adds more readable aliases for some of the special tokens used
in targets (eg "{start}" instead of "^"). Some behaviours may have
changed, for example prefix matches now happen before fnmatch.

/* $OpenBSD: cmd.c,v 1.104 2015/04/27 16:25:57 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/time.h>

#include <fnmatch.h>
#include <paths.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

const struct cmd_entry *cmd_table[] = {
	&cmd_attach_session_entry,
	&cmd_bind_key_entry,
	&cmd_break_pane_entry,
	&cmd_capture_pane_entry,
	&cmd_choose_buffer_entry,
	&cmd_choose_client_entry,
	&cmd_choose_session_entry,
	&cmd_choose_tree_entry,
	&cmd_choose_window_entry,
	&cmd_clear_history_entry,
	&cmd_clock_mode_entry,
	&cmd_command_prompt_entry,
	&cmd_confirm_before_entry,
	&cmd_copy_mode_entry,
	&cmd_delete_buffer_entry,
	&cmd_detach_client_entry,
	&cmd_display_message_entry,
	&cmd_display_panes_entry,
	&cmd_find_window_entry,
	&cmd_has_session_entry,
	&cmd_if_shell_entry,
	&cmd_join_pane_entry,
	&cmd_kill_pane_entry,
	&cmd_kill_server_entry,
	&cmd_kill_session_entry,
	&cmd_kill_window_entry,
	&cmd_last_pane_entry,
	&cmd_last_window_entry,
	&cmd_link_window_entry,
	&cmd_list_buffers_entry,
	&cmd_list_clients_entry,
	&cmd_list_commands_entry,
	&cmd_list_keys_entry,
	&cmd_list_panes_entry,
	&cmd_list_sessions_entry,
	&cmd_list_windows_entry,
	&cmd_load_buffer_entry,
	&cmd_lock_client_entry,
	&cmd_lock_server_entry,
	&cmd_lock_session_entry,
	&cmd_move_pane_entry,
	&cmd_move_window_entry,
	&cmd_new_session_entry,
	&cmd_new_window_entry,
	&cmd_next_layout_entry,
	&cmd_next_window_entry,
	&cmd_paste_buffer_entry,
	&cmd_pipe_pane_entry,
	&cmd_previous_layout_entry,
	&cmd_previous_window_entry,
	&cmd_refresh_client_entry,
	&cmd_rename_session_entry,
	&cmd_rename_window_entry,
	&cmd_resize_pane_entry,
	&cmd_respawn_pane_entry,
	&cmd_respawn_window_entry,
	&cmd_rotate_window_entry,
	&cmd_run_shell_entry,
	&cmd_save_buffer_entry,
	&cmd_select_layout_entry,
	&cmd_select_pane_entry,
	&cmd_select_window_entry,
	&cmd_send_keys_entry,
	&cmd_send_prefix_entry,
	&cmd_server_info_entry,
	&cmd_set_buffer_entry,
	&cmd_set_environment_entry,
	&cmd_set_option_entry,
	&cmd_set_window_option_entry,
	&cmd_show_buffer_entry,
	&cmd_show_environment_entry,
	&cmd_show_messages_entry,
	&cmd_show_options_entry,
	&cmd_show_window_options_entry,
	&cmd_source_file_entry,
	&cmd_split_window_entry,
	&cmd_start_server_entry,
	&cmd_suspend_client_entry,
	&cmd_swap_pane_entry,
	&cmd_swap_window_entry,
	&cmd_switch_client_entry,
	&cmd_unbind_key_entry,
	&cmd_unlink_window_entry,
	&cmd_wait_for_entry,
	NULL
};

int
cmd_pack_argv(int argc, char **argv, char *buf, size_t len)
{
	size_t	arglen;
	int	i;

	if (argc == 0)
		return (0);

	*buf = '\0';
	for (i = 0; i < argc; i++) {
		if (strlcpy(buf, argv[i], len) >= len)
			return (-1);
		arglen = strlen(argv[i]) + 1;
		buf += arglen;
		len -= arglen;
	}

	return (0);
}

int
cmd_unpack_argv(char *buf, size_t len, int argc, char ***argv)
{
	int	i;
	size_t	arglen;

	if (argc == 0)
		return (0);
	*argv = xcalloc(argc, sizeof **argv);

	buf[len - 1] = '\0';
	for (i = 0; i < argc; i++) {
		if (len == 0) {
			cmd_free_argv(argc, *argv);
			return (-1);
		}

		arglen = strlen(buf) + 1;
		(*argv)[i] = xstrdup(buf);
		buf += arglen;
		len -= arglen;
	}

	return (0);
}

char **
cmd_copy_argv(int argc, char **argv)
{
	char	**new_argv;
	int	  i;

	if (argc == 0)
		return (NULL);
	new_argv = xcalloc(argc + 1, sizeof *new_argv);
	for (i = 0; i < argc; i++) {
		if (argv[i] != NULL)
			new_argv[i] = xstrdup(argv[i]);
	}
	return (new_argv);
}

void
cmd_free_argv(int argc, char **argv)
{
	int	i;

	if (argc == 0)
		return;
	for (i = 0; i < argc; i++)
		free(argv[i]);
	free(argv);
}

char *
cmd_stringify_argv(int argc, char **argv)
{
	char	*buf;
	int	 i;
	size_t	 len;

	if (argc == 0)
		return (xstrdup(""));

	len = 0;
	buf = NULL;

	for (i = 0; i < argc; i++) {
		len += strlen(argv[i]) + 1;
		buf = xrealloc(buf, len);

		if (i == 0)
			*buf = '\0';
		else
			strlcat(buf, " ", len);
		strlcat(buf, argv[i], len);
	}
	return (buf);
}

struct cmd *
cmd_parse(int argc, char **argv, const char *file, u_int line, char **cause)
{
	const struct cmd_entry **entryp, *entry;
	struct cmd		*cmd;
	struct args		*args;
	char			 s[BUFSIZ];
	int			 ambiguous = 0;

	*cause = NULL;
	if (argc == 0) {
		xasprintf(cause, "no command");
		return (NULL);
	}

	entry = NULL;
	for (entryp = cmd_table; *entryp != NULL; entryp++) {
		if ((*entryp)->alias != NULL &&
		    strcmp((*entryp)->alias, argv[0]) == 0) {
			ambiguous = 0;
			entry = *entryp;
			break;
		}

		if (strncmp((*entryp)->name, argv[0], strlen(argv[0])) != 0)
			continue;
		if (entry != NULL)
			ambiguous = 1;
		entry = *entryp;

		/* Bail now if an exact match. */
		if (strcmp(entry->name, argv[0]) == 0)
			break;
	}
	if (ambiguous)
		goto ambiguous;
	if (entry == NULL) {
		xasprintf(cause, "unknown command: %s", argv[0]);
		return (NULL);
	}

	args = args_parse(entry->args_template, argc, argv);
	if (args == NULL)
		goto usage;
	if (entry->args_lower != -1 && args->argc < entry->args_lower)
		goto usage;
	if (entry->args_upper != -1 && args->argc > entry->args_upper)
		goto usage;

	cmd = xcalloc(1, sizeof *cmd);
	cmd->entry = entry;
	cmd->args = args;

	if (file != NULL)
		cmd->file = xstrdup(file);
	cmd->line = line;

	return (cmd);

ambiguous:
	*s = '\0';
	for (entryp = cmd_table; *entryp != NULL; entryp++) {
		if (strncmp((*entryp)->name, argv[0], strlen(argv[0])) != 0)
			continue;
		if (strlcat(s, (*entryp)->name, sizeof s) >= sizeof s)
			break;
		if (strlcat(s, ", ", sizeof s) >= sizeof s)
			break;
	}
	s[strlen(s) - 2] = '\0';
	xasprintf(cause, "ambiguous command: %s, could be: %s", argv[0], s);
	return (NULL);

usage:
	if (args != NULL)
		args_free(args);
	xasprintf(cause, "usage: %s %s", entry->name, entry->usage);
	return (NULL);
}

size_t
cmd_print(struct cmd *cmd, char *buf, size_t len)
{
	size_t	off, used;

	off = xsnprintf(buf, len, "%s ", cmd->entry->name);
	if (off + 1 < len) {
		used = args_print(cmd->args, buf + off, len - off - 1);
		if (used == 0)
			off--;
		else
			off += used;
		buf[off] = '\0';
	}
	return (off);
}

/* Adjust current mouse position for a pane. */
int
cmd_mouse_at(struct window_pane *wp, struct mouse_event *m, u_int *xp,
    u_int *yp, int last)
{
	u_int	x, y;

	if (last) {
		x = m->lx;
		y = m->ly;
	} else {
		x = m->x;
		y = m->y;
	}

	if (m->statusat == 0 && y > 0)
		y--;
	else if (m->statusat > 0 && y >= (u_int)m->statusat)
		y = m->statusat - 1;

	if (x < wp->xoff || x >= wp->xoff + wp->sx)
		return (-1);
	if (y < wp->yoff || y >= wp->yoff + wp->sy)
		return (-1);

	*xp = x - wp->xoff;
	*yp = y - wp->yoff;
	return (0);
}

/* Get current mouse window if any. */
struct winlink *
cmd_mouse_window(struct mouse_event *m, struct session **sp)
{
	struct session	*s;
	struct window	*w;

	if (!m->valid || m->s == -1 || m->w == -1)
		return (NULL);
	if ((s = session_find_by_id(m->s)) == NULL)
		return (NULL);
	if ((w = window_find_by_id(m->w)) == NULL)
		return (NULL);

	if (sp != NULL)
		*sp = s;
	return (winlink_find_by_window(&s->windows, w));
}

/* Get current mouse pane if any. */
struct window_pane *
cmd_mouse_pane(struct mouse_event *m, struct session **sp,
    struct winlink **wlp)
{
	struct winlink		*wl;
	struct window_pane     	*wp;

	if ((wl = cmd_mouse_window(m, sp)) == NULL)
		return (NULL);
	if ((wp = window_pane_find_by_id(m->wp)) == NULL)
		return (NULL);
	if (!window_has_pane(wl->window, wp))
		return (NULL);

	if (wlp != NULL)
		*wlp = wl;
	return (wp);
}

/* Replace the first %% or %idx in template by s. */
char *
cmd_template_replace(const char *template, const char *s, int idx)
{
	char		 ch, *buf;
	const char	*ptr;
	int		 replaced;
	size_t		 len;

	if (strchr(template, '%') == NULL)
		return (xstrdup(template));

	buf = xmalloc(1);
	*buf = '\0';
	len = 0;
	replaced = 0;

	ptr = template;
	while (*ptr != '\0') {
		switch (ch = *ptr++) {
		case '%':
			if (*ptr < '1' || *ptr > '9' || *ptr - '0' != idx) {
				if (*ptr != '%' || replaced)
					break;
				replaced = 1;
			}
			ptr++;

			len += strlen(s);
			buf = xrealloc(buf, len + 1);
			strlcat(buf, s, len + 1);
			continue;
		}
		buf = xrealloc(buf, len + 2);
		buf[len++] = ch;
		buf[len] = '\0';
	}

	return (buf);
}