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#include <ncurses.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#define waddstr_(text) waddstr(main_window, text)
#define waddch_(ch) waddch(main_window, ch)
#define wprintw_(format, data) wprintw(main_window, format, data)
#define newline waddch_('\n')
#define repeat(i, n) for (int i = 0; i < n; ++i)
#define get_tile_at(k) (grid + y * ((x + size) % (size + 1) + k * x) + (size + 1 - y) * i)
WINDOW *main_window;
char *message = "\0";
int size, num_rows, num_columns, new_tile_pos, num_empty_slots, changed, last_empty_tile_index, *last_non_empty_tile,
*this_tile, grid_buf[128], *grid = grid_buf;
void draw_frame_1() {
waddch_('+');
repeat(i, 8 * size - 1) {
waddch_('-');
}
waddch_('+');
newline;
}
void draw_frame_2() {
waddch_('|');
repeat(i, size) {
repeat(j, 8) {
waddch_(32);
}
waddch_('\b');
waddch_('|');
}
newline;
}
void show_grid() {
draw_frame_1();
repeat(i, size) {
draw_frame_2();
waddstr_("| ");
repeat(j, size) {
if (!*grid) {
waddstr_(" | ");
} else if (*grid >= 1024) {
wprintw_(" %2dk | ", *grid / 1024);
} else {
wprintw_("%4d | ", *grid);
}
++grid;
}
newline;
draw_frame_2();
if (i < size - 1) {
waddch_('|');
repeat(j, size) {
repeat(j, 8) {
waddch_('-');
}
waddch_('\b');
if (j < size - 1) {
waddch_('+');
}
}
waddch_('|');
newline;
}
}
draw_frame_1();
grid -= size * size;
}
int move_grid(int x, int y, int do_change) {
changed = 0;
repeat(i, size) {
last_empty_tile_index = 0;
last_non_empty_tile = 0;
repeat(j, size) {
this_tile = get_tile_at(j);
if (*this_tile) {
if (last_non_empty_tile && *this_tile == *last_non_empty_tile) {
if (do_change) {
*last_non_empty_tile *= 2;
*this_tile = 0;
}
last_non_empty_tile = 0;
changed = 1;
} else {
last_non_empty_tile = get_tile_at(last_empty_tile_index);
if (do_change) {
*last_non_empty_tile = *this_tile;
}
++last_empty_tile_index;
}
}
}
for (; last_empty_tile_index < size; ++last_empty_tile_index) {
this_tile = get_tile_at(last_empty_tile_index);
changed |= *this_tile;
if (do_change) {
*this_tile = 0;
}
}
}
return !changed;
}
void put_new_tile() {
num_empty_slots = 0;
repeat(i, size * size) {
if (!grid[i]) {
++num_empty_slots;
}
}
if (num_empty_slots == 0) {
return;
}
new_tile_pos = rand() % num_empty_slots;
repeat(i, size * size) {
if (!grid[i] && --num_empty_slots == new_tile_pos) {
grid[i] = rand() % 8 ? 2 : 4;
}
}
}
int main(int argc, char **argv) {
srand(time(0));
initscr();
cbreak();
noecho();
curs_set(0);
getmaxyx(stdscr, num_rows, num_columns);
size = argc > 1 ? (*argv[1] - '0') : 4;
if (size <= 1 || size > 8) {
message = "\1Invalid size given.\n";
goto quit;
}
main_window = newwin(0, 0, (num_rows - 4 * size) / 2, (num_columns - 8 * size) / 2);
if (!main_window) {
message = "\1Terminal too small.\n";
goto quit;
}
put_new_tile();
put_new_tile();
while (1) {
wclear(main_window);
show_grid();
waddstr_(" h,j,k,l: move q: quit");
wrefresh(main_window);
switch (wgetch(main_window)) {
case 'q':
goto quit;
case 'h':
move_grid(1, 1, 1);
goto move_end;
case 'j':
move_grid(-1, size, 1);
goto move_end;
case 'k':
move_grid(1, size, 1);
goto move_end;
case 'l':
move_grid(-1, 1, 1);
goto move_end;
move_end:
if (changed) {
put_new_tile();
}
if (move_grid(1, 1, 0) & move_grid(-1, 1, 0) & move_grid(1, size, 0) & move_grid(-1, size, 0)) {
message = "\0Game over.\n";
goto quit;
}
usleep(2048 * 8);
break;
}
}
quit:
if (main_window) {
delwin(main_window);
}
endwin();
fputs(message + 1, stderr);
return *message;
}
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