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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();
nonl();
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
struct page *page = new_page();
struct point cursor = {page, 0};
if (argc > 1) {
FILE *f = fopen(argv[1], "r");
char c;
while ((c = fgetc(f)) != EOF) {
insert_at_point(&cursor, c);
}
fclose(f);
}
int window_height = getmaxy(stdscr);
int current_line = 0;
int old_line = -1;
int number_of_lines = 0;
for (struct point i = {page, 0}; !at_eof(&i); move_point_forward(&i)) {
if (element(&i) == '\n') number_of_lines++;
}
while (1) {
if (old_line != current_line) {
clear();
int iter_line = 0;
for (struct point i = {page, 0}; !at_eof(&i) && iter_line < window_height + current_line; move_point_forward(&i)) {
if (iter_line >= current_line) addch(element(&i));
if (element(&i) == '\n') iter_line++;
}
}
old_line = current_line;
int input = getch();
switch (input) {
case KEY_UP:
if (current_line > 0) current_line--;
break;
case KEY_DOWN:
if (current_line < number_of_lines - window_height) current_line++;
}
}
endwin();
return 0;
}
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