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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"
void scroll_window_up(struct point *start, int window_width) {
int travel_distance = 0;
move_point_backward(start);
move_point_backward(start);
while (start->index != 0 && element(start) != '\n' && travel_distance < window_width) {
move_point_backward(start);
travel_distance++;
}
if (element(start) == '\n') move_point_forward(start);
}
void scroll_window_down(struct point *start, int window_width) {
int travel_distance = 0;
while (element(start) != EOF && element(start) != '\n' && travel_distance < window_width) {
move_point_forward(start);
travel_distance++;
}
if (element(start) == '\n') move_point_forward(start);
}
int main(int argc, char *argv[]) {
initscr();
cbreak();
noecho();
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
struct page *page = new_page();
struct point current_line = {page, 0};
struct point cursor = current_line;
if (argc > 1) {
FILE *f = fopen(argv[1], "r");
char c;
while ((c = fgetc(f)) != EOF) {
insert_at_point(&cursor, c);
}
cursor = current_line;
fclose(f);
}
int window_height, window_width;
getmaxyx(stdscr, window_height, window_width);
while (1) {
clear();
int x = -1, y = -1;
for (struct point i = current_line; element(&i) != EOF && getcury(stdscr) < window_height - 1; move_point_forward(&i)) {
if (same_point(&i, &cursor)) {
getyx(stdscr, y, x);
}
addch(element(&i));
}
if (x > -1 && y > -1) {
move(y, x);
}
int input = getch();
switch (input) {
case KEY_UP:
scroll_window_up(¤t_line, window_width);
break;
case KEY_DOWN:
scroll_window_down(¤t_line, window_width);
break;
case KEY_LEFT:
move_point_backward(&cursor);
break;
case KEY_RIGHT:
move_point_forward(&cursor);
break;
case KEY_BACKSPACE:
delete_at_point(&cursor);
break;
default:
insert_at_point(&cursor, input);
}
}
endwin();
return 0;
}
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