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#include <stdio.h>
#include <stdint.h>
#include <stddef.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#define ARENA_IMPL
#define UTF8_IMPL
#include "wrmr.h"
#include "arena.h"
#include "txt.h"
#include "vui.h"
#include "utf8.h"
Arena scratch = { 0 };
Txt txt = { 0 };
u32 cur = 0;
int is_space(u32 c) {
return c <= 0x20 && c != 0;
}
u32 move_word_back(Txt *t, u32 cur) {
TxtLoc l = txt_at(t, cur);
while (!txt_at_start(t,l)) {
TxtLoc n = txt_prev(t, l);
if (!is_space(txt_chr(t, n))) break;
l = n;
}
while (!txt_at_start(t,l)) {
TxtLoc n = txt_prev(t, l);
if (is_space(txt_chr(t, n))) break;
l = n;
}
return txt_ofs(t, l);
}
u32 move_word_fwd(Txt *t, u32 cur) {
TxtLoc l = txt_at(t, cur);
while (!txt_at_end(t,l) && is_space(txt_chr(t, l))) l = txt_next(t, l);
while (!txt_at_end(t,l) && !is_space(txt_chr(t, l))) l = txt_next(t, l);
return txt_ofs(t, l);
}
u32 move_char_back(Txt *t, u32 cur) {
while (cur > 0) {
cur--;
u8 c = txt_byte(t, txt_at(t, cur));
if ((c & 0xc0) != 0x80) break;
}
return cur;
}
u32 move_char_fwd(Txt *t, u32 cur) {
u8 b = txt_byte(t, txt_at(t, cur));
u32 n = stdc_leading_ones(b);
if (cur + n >= t->len) return t->len;
return cur + n + !n;
}
u32 del_between(Txt *t, u32 a, u32 b) {
if (b < a) { u32 t = a; a = b; b = t; }
//if (b - a > 10) TRAP();
return txt_delete(t, b, b - a);
}
/* main */
#define ODD_ATTR (FG_CYAN | BG_BLACK)
#define EVEN_ATTR (FG_WHITE | BG_BLACK)
void draw(void *ctx) {
(void)ctx;
redraw:;
vui_clear();
static int max_y = 0;
int x = 0, y = 0;
u32 ofs = 0;
for (u32 i = 0; i < txt.ptbl.n; i++) {
Arena stk = scratch;
TxtPiece *p = &txt.ptbl.v[i];
const char *s = txt.buf[p->buf].s + p->ofs;
u32 bufn = utf8_decode_len(s, p->n);
u32 *buf = new_arr(&scratch, u32, bufn);
utf8_decode(buf, s, bufn);
VuiAttr a = i&1 ? ODD_ATTR : EVEN_ATTR;
vui_aprintf(-1, i, a, "%u, %u (%s)", p->ofs, p->n, p->buf == TXT_ADD ? "add" : "src");
for (u32 j = 0; j < bufn; j++) {
u32 c = buf[j];
if (ofs == cur) vui_curs_pos(x, y - (max_y - LINES + 1));
if (c != '\r' && c != '\n') {
vui_chra(x++, y - (max_y - LINES + 1), c, a);
}
if (c == '\n') {
x = 0;
y++;
}
ofs += UTF8_CP_LEN(c);
}
scratch = stk;
}
if (ofs == cur) vui_curs_pos(x, y - (max_y - LINES + 1));
if (y > max_y) {
max_y = y;
goto redraw;
}
TxtLoc l = txt_at(&txt, cur);
u32 c = txt_chr(&txt, l);
vui_printf(-1, -1, "%u, %u - %02x (%c)", l.p, l.i, c, (c < 0x20 || c > 0x7e) ? ' ' : c);
u32 used = scratch.beg - scratch.start, max = scratch.end - scratch.start;
vui_printf(-1, -2, "scratch %.02f/%.02fk", used/1024.0, max/1024.0);
}
int main(void) {
scratch = arena_init(1L << 20);
vui_init();
vui_curs_vis(1);
vui_redraw_fn(draw);
if (txt_load(&txt, "test.txt")) err(1, "couldn't open file");
cur = txt.len;
for (;;) {
scratch.beg = scratch.start;
draw(NULL);
vui_blit();
u32 c = vui_key();
switch (c) {
case KEY_ESC:
goto brk;
case KEY_BKSP:
cur = txt_delete_c(&txt, cur);
break;
case KEY_LEFT:
cur = move_char_back(&txt, cur);
break;
case KEY_LEFT | KEY_CTRL_BIT:
cur = move_word_back(&txt, cur);
break;
case KEY_RIGHT:
cur = move_char_fwd(&txt, cur);
break;
case KEY_RIGHT | KEY_CTRL_BIT:
cur = move_word_fwd(&txt, cur);
break;
case 0x17 /* ^W */:
cur = del_between(&txt, move_word_back(&txt, cur), cur);
break;
case 0x05 /* ^E */:
cur = del_between(&txt, cur, move_word_fwd(&txt, cur));
break;
case 0x13 /* ^S */:
txt_save(&txt, "test.txt");
txt_load(&txt, "test.txt");
break;
case '\r':
cur = txt_insert_c(&txt, cur, '\n');
break;
default:
if (c >= ' ' && c <= KEY_UTF8_MAX) cur = txt_insert_c(&txt, cur, c);
break;
}
}
brk:
vui_fini();
arena_free(&scratch);
return 0;
}
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