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#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <curses.h>
#include "page.c"
#include "point.c"
int main(int argc, char *argv[]) {
initscr();
cbreak();
noecho();
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
struct point buffer_start = {new_page()};
struct point window_start = buffer_start;
struct point cursor = window_start;
if (argc > 1) {
FILE *f = fopen(argv[1], "r");
char c;
while ((c = fgetc(f)) != EOF) {
insert_at_point(&cursor, c);
}
cursor = window_start;
fclose(f);
}
int window_height, window_width;
getmaxyx(stdscr, window_height, window_width);
while (1) {
clear();
int x = -1, y = -1;
struct point window_end = window_start;
while (element(&window_end) && getcury(stdscr) < window_height - 1) {
if (same_point(&window_end, &cursor)) {
getyx(stdscr, y, x);
}
addch(element(&window_end));
move_point_forward(&window_end);
}
if (x > -1 && y > -1) {
move(y, x);
}
int input = getch();
switch (input) {
case KEY_UP:
prev_line(&window_start, window_width);
prev_line(&cursor, window_width);
break;
case KEY_DOWN:
if (element(&window_end)) {
next_line(&window_start, window_width);
}
next_line(&cursor, window_width);
if (same_point(&cursor, &window_end)) {
move_point_backward(&cursor);
}
break;
case KEY_LEFT:
if (same_point(&cursor, &window_start)) {
prev_line(&window_start, window_width);
}
move_point_backward(&cursor);
break;
case KEY_RIGHT:
if (same_point(&cursor, &window_end)) {
next_line(&window_start, window_width);
}
move_point_forward(&cursor);
if (same_point(&cursor, &window_end)) {
move_point_backward(&cursor);
}
break;
case KEY_BACKSPACE:
if (same_point(&cursor, &window_start)) {
prev_line(&window_start, window_width);
}
delete_at_point(&cursor);
break;
default:
if (same_point(&cursor, &window_end)) {
next_line(&window_start, window_width);
}
insert_at_point(&cursor, input);
move_point_backward(&cursor);
if (element(&cursor) == '\n') {
next_line(&window_start, window_width);
}
move_point_forward(&cursor);
}
}
endwin();
return 0;
}
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