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Drop the ability to have a list of keys in the prefix in favour of two
separate options, prefix and prefix2. This simplifies the code and gets
rid the data options type which was only used for this one option.

Also add a -2 flag to send-prefix to send the secondary prefix key,
fixing a cause of minor irritation.

People who want three prefix keys are out of luck :-).

/* $OpenBSD: key-string.c,v 1.22 2012/01/21 08:40:09 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 <string.h>

#include "tmux.h"

int	key_string_search_table(const char *);
int	key_string_get_modifiers(const char **);

const struct {
	const char     *string;
	int	 	key;
} key_string_table[] = {
	/* Function keys. */
	{ "F1",		KEYC_F1 },
	{ "F2",		KEYC_F2 },
	{ "F3",		KEYC_F3 },
	{ "F4",		KEYC_F4 },
	{ "F5",		KEYC_F5 },
	{ "F6",		KEYC_F6 },
	{ "F7",		KEYC_F7 },
	{ "F8",		KEYC_F8 },
	{ "F9",		KEYC_F9 },
	{ "F10",	KEYC_F10 },
	{ "F11",	KEYC_F11 },
	{ "F12",	KEYC_F12 },
	{ "F13",	KEYC_F13 },
	{ "F14",	KEYC_F14 },
	{ "F15",	KEYC_F15 },
	{ "F16",	KEYC_F16 },
	{ "F17",	KEYC_F17 },
	{ "F18",	KEYC_F18 },
	{ "F19",	KEYC_F19 },
	{ "F20",	KEYC_F20 },
	{ "IC",		KEYC_IC },
	{ "DC",		KEYC_DC },
	{ "Home",	KEYC_HOME },
	{ "End",	KEYC_END },
	{ "NPage",	KEYC_NPAGE },
	{ "PageDown",	KEYC_NPAGE },
	{ "PgDn",	KEYC_NPAGE },
	{ "PPage",	KEYC_PPAGE },
	{ "PageUp",	KEYC_PPAGE },
	{ "PgUp",	KEYC_PPAGE },
	{ "Tab",	'\011' },
	{ "BTab",	KEYC_BTAB },
	{ "Space",	' ' },
	{ "BSpace",	KEYC_BSPACE },
	{ "Enter",	'\r' },
	{ "Escape",	'\033' },

	/* Arrow keys. */
	{ "Up",		KEYC_UP },
	{ "Down",	KEYC_DOWN },
	{ "Left",	KEYC_LEFT },
	{ "Right",	KEYC_RIGHT },

	/* Numeric keypad. */
	{ "KP/", 	KEYC_KP_SLASH },
	{ "KP*",	KEYC_KP_STAR },
	{ "KP-",	KEYC_KP_MINUS },
	{ "KP7",	KEYC_KP_SEVEN },
	{ "KP8",	KEYC_KP_EIGHT },
	{ "KP9",	KEYC_KP_NINE },
	{ "KP+",	KEYC_KP_PLUS },
	{ "KP4",	KEYC_KP_FOUR },
	{ "KP5",	KEYC_KP_FIVE },
	{ "KP6",	KEYC_KP_SIX },
	{ "KP1",	KEYC_KP_ONE },
	{ "KP2",	KEYC_KP_TWO },
	{ "KP3",	KEYC_KP_THREE },
	{ "KPEnter",	KEYC_KP_ENTER },
	{ "KP0",	KEYC_KP_ZERO },
	{ "KP.",	KEYC_KP_PERIOD },
};

/* Find key string in table. */
int
key_string_search_table(const char *string)
{
	u_int	i;

	for (i = 0; i < nitems(key_string_table); i++) {
		if (strcasecmp(string, key_string_table[i].string) == 0)
			return (key_string_table[i].key);
	}
	return (KEYC_NONE);
}

/* Find modifiers. */
int
key_string_get_modifiers(const char **string)
{
	int	modifiers;

	modifiers = 0;
	while (((*string)[0] != '\0') && (*string)[1] == '-') {
		switch ((*string)[0]) {
		case 'C':
		case 'c':
			modifiers |= KEYC_CTRL;
			break;
		case 'M':
		case 'm':
			modifiers |= KEYC_ESCAPE;
			break;
		case 'S':
		case 's':
			modifiers |= KEYC_SHIFT;
			break;
		}
		*string += 2;
	}
	return (modifiers);
}

/* Lookup a string and convert to a key value. */
int
key_string_lookup_string(const char *string)
{
	int	key, modifiers;

	/* Check for modifiers. */
	modifiers = 0;
	if (string[0] == '^' && string[1] != '\0') {
		modifiers |= KEYC_CTRL;
		string++;
	}
	modifiers |= key_string_get_modifiers(&string);
	if (string[0] == '\0')
		return (KEYC_NONE);

	/* Is this a standard ASCII key? */
	if (string[1] == '\0') {
		key = (u_char) string[0];
		if (key < 32 || key == 127 || key > 255)
			return (KEYC_NONE);
	} else {
		/* Otherwise look the key up in the table. */
		key = key_string_search_table(string);
		if (key == KEYC_NONE)
			return (KEYC_NONE);
	}

	/* Convert the standard control keys. */
	if (key < KEYC_BASE && (modifiers & KEYC_CTRL)) {
		if (key >= 97 && key <= 122)
			key -= 96;
		else if (key >= 64 && key <= 95)
			key -= 64;
		else if (key == 32)
			key = 0;
		else if (key == 63)
			key = KEYC_BSPACE;
		else
			return (KEYC_NONE);
		modifiers &= ~KEYC_CTRL;
	}

	return (key | modifiers);
}

/* Convert a key code into string format, with prefix if necessary. */
const char *
key_string_lookup_key(int key)
{
	static char	out[24];
	char		tmp[8];
	u_int	   	i;

	*out = '\0';

	/* Handle no key. */
	if (key == KEYC_NONE)
		return ("none");

	/*
	 * Special case: display C-@ as C-Space. Could do this below in
	 * the (key >= 0 && key <= 32), but this way we let it be found
	 * in key_string_table, for the unlikely chance that we might
	 * change its name.
	 */
	if ((key & KEYC_MASK_KEY) == 0)
	    key = ' ' | KEYC_CTRL | (key & KEYC_MASK_MOD);

	/* Fill in the modifiers. */
	if (key & KEYC_CTRL)
		strlcat(out, "C-", sizeof out);
	if (key & KEYC_ESCAPE)
		strlcat(out, "M-", sizeof out);
	if (key & KEYC_SHIFT)
		strlcat(out, "S-", sizeof out);
	key &= KEYC_MASK_KEY;

	/* Try the key against the string table. */
	for (i = 0; i < nitems(key_string_table); i++) {
		if (key == key_string_table[i].key)
			break;
	}
	if (i != nitems(key_string_table)) {
		strlcat(out, key_string_table[i].string, sizeof out);
		return (out);
	}

	/* Invalid keys are errors. */
	if (key == 127 || key > 255)
		return (NULL);

	/* Check for standard or control key. */
	if (key >= 0 && key <= 32) {
		if (key == 0 || key > 26)
			xsnprintf(tmp, sizeof tmp, "C-%c", 64 + key);
		else
			xsnprintf(tmp, sizeof tmp, "C-%c", 96 + key);
	} else if (key >= 32 && key <= 126) {
		tmp[0] = key;
		tmp[1] = '\0';
	} else if (key >= 128)
		xsnprintf(tmp, sizeof tmp, "\\%o", key);

	strlcat(out, tmp, sizeof out);
	return (out);
}