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Add resize-pane -Z to temporary zoom the active pane to occupy the full
window or unzoom (restored to the normal layout) if it already zoomed,
bound to C-b z by default. The pane is unzoomed on pretty much any
excuse whatsoever.

We considered making this a new layout but the requirements are quite
different from layouts so decided it is better as a special case. Each
current layout cell is saved, a temporary one-cell layout generated and
all except the active pane set to NULL.

Prompted by suggestions and scripts from several. Thanks to Aaron Jensen
and Thiago Padilha for testing an earlier version.

/* $OpenBSD: input-keys.c,v 1.32 2013/03/24 09:57:59 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 <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * This file is rather misleadingly named, it contains the code which takes a
 * key code and translates it into something suitable to be sent to the
 * application running in a pane (similar to input.c does in the other
 * direction with output).
 */

struct input_key_ent {
	int		 key;
	const char	*data;

	int		 flags;
#define INPUTKEY_KEYPAD 0x1	/* keypad key */
#define INPUTKEY_CURSOR 0x2	/* cursor key */
};

const struct input_key_ent input_keys[] = {
	/* Backspace key. */
	{ KEYC_BSPACE,		"\177",		0 },

	/* Function keys. */
	{ KEYC_F1,		"\033OP",	0 },
	{ KEYC_F2,		"\033OQ",	0 },
	{ KEYC_F3,		"\033OR",	0 },
	{ KEYC_F4,		"\033OS",	0 },
	{ KEYC_F5,		"\033[15~",	0 },
	{ KEYC_F6,		"\033[17~",	0 },
	{ KEYC_F7,		"\033[18~",	0 },
	{ KEYC_F8,		"\033[19~",	0 },
	{ KEYC_F9,		"\033[20~",	0 },
	{ KEYC_F10,		"\033[21~",	0 },
	{ KEYC_F11,		"\033[23~",	0 },
	{ KEYC_F12,		"\033[24~",	0 },
	{ KEYC_F13,		"\033[25~",	0 },
	{ KEYC_F14,		"\033[26~",	0 },
	{ KEYC_F15,		"\033[28~",	0 },
	{ KEYC_F16,		"\033[29~",	0 },
	{ KEYC_F17,		"\033[31~",	0 },
	{ KEYC_F18,		"\033[32~",	0 },
	{ KEYC_F19,		"\033[33~",	0 },
	{ KEYC_F20,		"\033[34~",	0 },
	{ KEYC_IC,		"\033[2~",	0 },
	{ KEYC_DC,		"\033[3~",	0 },
	{ KEYC_HOME,		"\033[1~",	0 },
	{ KEYC_END,		"\033[4~",	0 },
	{ KEYC_NPAGE,		"\033[6~",	0 },
	{ KEYC_PPAGE,		"\033[5~",	0 },
	{ KEYC_BTAB,		"\033[Z",	0 },

	/*
	 * Arrow keys. Cursor versions must come first. The codes are toggled
	 * between CSI and SS3 versions when ctrl is pressed.
	 */
	{ KEYC_UP|KEYC_CTRL,	"\033[A",	INPUTKEY_CURSOR },
	{ KEYC_DOWN|KEYC_CTRL,	"\033[B",	INPUTKEY_CURSOR },
	{ KEYC_RIGHT|KEYC_CTRL,	"\033[C",	INPUTKEY_CURSOR },
	{ KEYC_LEFT|KEYC_CTRL,	"\033[D",	INPUTKEY_CURSOR },

	{ KEYC_UP,		"\033OA",	INPUTKEY_CURSOR },
	{ KEYC_DOWN,		"\033OB",	INPUTKEY_CURSOR },
	{ KEYC_RIGHT,		"\033OC",	INPUTKEY_CURSOR },
	{ KEYC_LEFT,		"\033OD",	INPUTKEY_CURSOR },

	{ KEYC_UP|KEYC_CTRL,	"\033OA",	0 },
	{ KEYC_DOWN|KEYC_CTRL,	"\033OB",	0 },
	{ KEYC_RIGHT|KEYC_CTRL,	"\033OC",	0 },
	{ KEYC_LEFT|KEYC_CTRL,	"\033OD",	0 },

	{ KEYC_UP,		"\033[A",	0 },
	{ KEYC_DOWN,		"\033[B",	0 },
	{ KEYC_RIGHT,		"\033[C",	0 },
	{ KEYC_LEFT,		"\033[D",	0 },

	/* Keypad keys. Keypad versions must come first. */
	{ KEYC_KP_SLASH,	"\033Oo",	INPUTKEY_KEYPAD },
	{ KEYC_KP_STAR,		"\033Oj",	INPUTKEY_KEYPAD },
	{ KEYC_KP_MINUS,	"\033Om",	INPUTKEY_KEYPAD },
	{ KEYC_KP_SEVEN,	"\033Ow",	INPUTKEY_KEYPAD },
	{ KEYC_KP_EIGHT,	"\033Ox",	INPUTKEY_KEYPAD },
	{ KEYC_KP_NINE,		"\033Oy",	INPUTKEY_KEYPAD },
	{ KEYC_KP_PLUS,		"\033Ok",	INPUTKEY_KEYPAD },
	{ KEYC_KP_FOUR,		"\033Ot",	INPUTKEY_KEYPAD },
	{ KEYC_KP_FIVE,		"\033Ou",	INPUTKEY_KEYPAD },
	{ KEYC_KP_SIX,		"\033Ov",	INPUTKEY_KEYPAD },
	{ KEYC_KP_ONE,		"\033Oq",	INPUTKEY_KEYPAD },
	{ KEYC_KP_TWO,		"\033Or",	INPUTKEY_KEYPAD },
	{ KEYC_KP_THREE,	"\033Os",	INPUTKEY_KEYPAD },
	{ KEYC_KP_ENTER,	"\033OM",	INPUTKEY_KEYPAD },
	{ KEYC_KP_ZERO,		"\033Op",	INPUTKEY_KEYPAD },
	{ KEYC_KP_PERIOD,	"\033On",	INPUTKEY_KEYPAD },

	{ KEYC_KP_SLASH,	"/",		0 },
	{ KEYC_KP_STAR,		"*",		0 },
	{ KEYC_KP_MINUS,	"-",		0 },
	{ KEYC_KP_SEVEN,	"7",		0 },
	{ KEYC_KP_EIGHT,	"8",		0 },
	{ KEYC_KP_NINE,		"9",		0 },
	{ KEYC_KP_PLUS,		"+",		0 },
	{ KEYC_KP_FOUR,		"4",		0 },
	{ KEYC_KP_FIVE,		"5",		0 },
	{ KEYC_KP_SIX,		"6",		0 },
	{ KEYC_KP_ONE,		"1",		0 },
	{ KEYC_KP_TWO,		"2",		0 },
	{ KEYC_KP_THREE,	"3",		0 },
	{ KEYC_KP_ENTER,	"\n",		0 },
	{ KEYC_KP_ZERO,		"0",		0 },
	{ KEYC_KP_PERIOD,	".",		0 },
};

/* Translate a key code into an output key sequence. */
void
input_key(struct window_pane *wp, int key)
{
	const struct input_key_ent     *ike;
	u_int				i;
	size_t				dlen;
	char			       *out;
	u_char				ch;

	log_debug2("writing key 0x%x", key);

	/*
	 * If this is a normal 7-bit key, just send it, with a leading escape
	 * if necessary.
	 */
	if (key != KEYC_NONE && (key & ~KEYC_ESCAPE) < 0x100) {
		if (key & KEYC_ESCAPE)
			bufferevent_write(wp->event, "\033", 1);
		ch = key & ~KEYC_ESCAPE;
		bufferevent_write(wp->event, &ch, 1);
		return;
	}

	/*
	 * Then try to look this up as an xterm key, if the flag to output them
	 * is set.
	 */
	if (options_get_number(&wp->window->options, "xterm-keys")) {
		if ((out = xterm_keys_lookup(key)) != NULL) {
			bufferevent_write(wp->event, out, strlen(out));
			free(out);
			return;
		}
	}

	/* Otherwise look the key up in the table. */
	for (i = 0; i < nitems(input_keys); i++) {
		ike = &input_keys[i];

		if ((ike->flags & INPUTKEY_KEYPAD) &&
		    !(wp->screen->mode & MODE_KKEYPAD))
			continue;
		if ((ike->flags & INPUTKEY_CURSOR) &&
		    !(wp->screen->mode & MODE_KCURSOR))
			continue;

		if ((key & KEYC_ESCAPE) && (ike->key | KEYC_ESCAPE) == key)
			break;
		if (ike->key == key)
			break;
	}
	if (i == nitems(input_keys)) {
		log_debug2("key 0x%x missing", key);
		return;
	}
	dlen = strlen(ike->data);
	log_debug2("found key 0x%x: \"%s\"", key, ike->data);

	/* Prefix a \033 for escape. */
	if (key & KEYC_ESCAPE)
		bufferevent_write(wp->event, "\033", 1);
	bufferevent_write(wp->event, ike->data, dlen);
}

/* Translate mouse and output. */
void
input_mouse(struct window_pane *wp, struct session *s, struct mouse_event *m)
{
	char			 buf[40];
	size_t			 len;
	struct paste_buffer	*pb;

	if (wp->screen->mode & ALL_MOUSE_MODES) {
		/*
		 * Use the SGR (1006) extension only if the application
		 * requested it and the underlying terminal also sent the event
		 * in this format (this is because an old style mouse release
		 * event cannot be converted into the new SGR format, since the
		 * released button is unknown). Otherwise pretend that tmux
		 * doesn't speak this extension, and fall back to the UTF-8
		 * (1005) extension if the application requested, or to the
		 * legacy format.
		 */
		if (m->sgr && (wp->screen->mode & MODE_MOUSE_SGR)) {
			len = xsnprintf(buf, sizeof buf, "\033[<%d;%d;%d%c",
			    m->sgr_xb, m->x + 1, m->y + 1,
			    m->sgr_rel ? 'm' : 'M');
		} else if (wp->screen->mode & MODE_MOUSE_UTF8) {
			len = xsnprintf(buf, sizeof buf, "\033[M");
			len += utf8_split2(m->xb + 32, &buf[len]);
			len += utf8_split2(m->x + 33, &buf[len]);
			len += utf8_split2(m->y + 33, &buf[len]);
		} else {
			if (m->xb > 223 || m->x >= 222 || m->y > 222)
				return;
			len = xsnprintf(buf, sizeof buf, "\033[M");
			buf[len++] = m->xb + 32;
			buf[len++] = m->x + 33;
			buf[len++] = m->y + 33;
		}
		bufferevent_write(wp->event, buf, len);
		return;
	}

	if (m->button == 1 && (m->event & MOUSE_EVENT_CLICK) &&
	    options_get_number(&wp->window->options, "mode-mouse") == 1) {
		pb = paste_get_top(&global_buffers);
		if (pb != NULL) {
			paste_send_pane(pb, wp, "\r",
			    wp->screen->mode & MODE_BRACKETPASTE);
		}
	} else if ((m->xb & 3) != 1 &&
	    options_get_number(&wp->window->options, "mode-mouse") == 1) {
		if (window_pane_set_mode(wp, &window_copy_mode) == 0) {
			window_copy_init_from_pane(wp);
			if (wp->mode->mouse != NULL)
				wp->mode->mouse(wp, s, m);
		}
	}
}