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/*
* map.c -- mapping routines.
*
* Copyright (C) 1998 by Massimiliano Ghilardi
*
* 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.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <sys/types.h>
#include <sys/time.h>
#include "defines.h"
#include "main.h"
#include "tty.h"
#include "edit.h"
#include "tcp.h"
#include "list.h"
/*
* mapping variables
*/
static char mappath[MAX_MAPLEN]; /* circular path list */
static int mapstart = 0; /* index to first map entry */
static int mapend = 0; /* index one past last map entry */
#define MAPINDEX(i) (((i) + MAX_MAPLEN) % MAX_MAPLEN)
#define MAPENTRY(i) mappath[MAPINDEX(i)]
/*
* return reverse direction
*/
static char reverse_dir(char dir)
{
static char dirs[] = "nsewud";
char *p = strchr(dirs, dir);
return p ? dirs[(p - dirs) ^ 1] : 0;
}
/*
* retrace steps on map, optionally walk them back
*/
void map_retrace(int steps, int walk_back)
{
char cmd[2];
cmd[1] = '\0';
if (!steps && !walk_back)
mapend = mapstart;
else {
if (!steps)
steps = -1;
if (walk_back && opt_echo) {
status(1);
tty_putc('[');
}
while (mapstart != mapend && steps--) {
mapend = MAPINDEX(mapend - 1);
if (walk_back) {
cmd[0] = reverse_dir(mappath[mapend]);
if (opt_echo)
tty_putc(cmd[0]);
tcp_write(tcp_fd, cmd);
}
}
if (walk_back && opt_echo)
tty_puts("]\n");
}
}
/*
* show automatic map (latest steps) in the form s2ews14n
*/
void map_show(void)
{
char lastdir;
int count = 0;
int i;
if (mapstart == mapend) {
PRINTF("#map empty\n");
} else {
PRINTF("#map: ");
lastdir = mappath[mapstart];
for (i = mapstart; i != mapend; i = MAPINDEX(i + 1)) {
if (mappath[i] != lastdir) {
if (count > 1)
tty_printf("%d", count);
tty_putc(lastdir);
count = 1;
lastdir = mappath[i];
} else
count++;
}
if (count > 1)
tty_printf("%d", count);
tty_printf("%c\n", lastdir);
}
}
/*
* print map to string in the form seewsnnnnn
*/
void map_sprintf(char *buf)
{
int i;
if (mapstart != mapend)
for (i = mapstart; i != mapend; i = MAPINDEX(i + 1))
*buf++ = mappath[i];
*buf = '\0';
}
/*
* add direction to automap
*/
void map_add_dir(char dir)
{
#ifdef NOMAZEMAPPING
if (mapend != mapstart && dir == reverse_dir(MAPENTRY(mapend - 1))) {
mapend = MAPINDEX(mapend - 1); /* retrace one step */
} else
#endif
{
MAPENTRY(mapend) = dir;
mapend = MAPINDEX(mapend + 1);
if(mapend == mapstart)
mapstart = MAPINDEX(mapstart + 1);
}
}
/*
* execute walk if word is valid [speed]walk sequence -
* return 1 if walked, 0 if not
*/
int map_walk(char *word, int silent, int maponly)
{
char buf[16];
int n = strlen(word);
int is_main = (tcp_fd == tcp_main_fd);
if (!is_main && !maponly && !opt_speedwalk)
return 0;
if (!n || (n > 1 && !opt_speedwalk && !maponly) ||
!strchr("neswud", word[n - 1]) ||
(int)strspn(word, "neswud0123456789") != n)
return 0;
if (maponly)
silent = 1;
buf[1] = '\0';
while (*word) {
if (!silent) { status(1); tty_putc('['); }
if (isdigit(*word)) {
n = strtol(word, &word, 10);
if (!silent)
tty_printf("%d", n);
} else
n = 1;
if (!silent)
tty_putc(*word);
while (n--) {
*buf = *word;
if (!maponly) {
if (*lookup_alias(buf))
parse_instruction(buf, 1, 0, 0); // we want to execute aliases n,e,s,w,u,d
else tcp_write(tcp_fd, buf);
}
if (is_main || maponly)
map_add_dir(*word);
}
if (!silent)
tty_puts("] ");
word++;
}
if (!silent)
tty_putc('\n');
return !maponly;
}
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