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// SPDX-License-Identifier: 0BSD
extern "C" {
#include "enter.h"
}
#include <algorithm>
#include <bit>
#include <ctype.h>
#include <limits.h>
#include <numeric>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
struct character {
wchar_t c;
char seg[MB_LEN_MAX];
unsigned seglen : std::bit_width(static_cast<unsigned>(MB_LEN_MAX));
unsigned width : 2;
bool space : 1;
bool word : 1;
};
static_assert(MB_LEN_MAX <= ((1 << std::bit_width(static_cast<unsigned>(MB_LEN_MAX))) - 1));
extern "C" struct enter_string enter_string(const char * init, size_t initlen) {
int y, x;
getyx(stdscr, y, x);
km_dokey_load_termios();
#define MEASURE(character) \
mvaddnwstr(y, x, &character.c, 1); \
character.width = getcurx(stdscr) - x; \
character.space = iswspace(character.c); \
character.word = iswalnum(character.c)
struct character * characters{};
size_t characters_len{}, characters_cap{};
#define BUMPCHAR() \
do { \
if(characters_len == characters_cap) { \
characters_cap = characters_cap ? characters_cap * 2 : 16; \
if(!(characters = reinterpret_cast<struct character *>(reallocarray(characters, characters_cap, sizeof(*characters))))) \
return {}; \
} \
} while(false)
while(initlen) {
if(!characters) {
characters_cap = initlen;
if(!(characters = reinterpret_cast<struct character *>(reallocarray(characters, characters_cap, sizeof(*characters)))))
return {};
}
struct character character = {};
mbstate_t state = {};
switch(auto r = mbrtowc(&character.c, init, initlen, &state)) {
case(size_t)-2: // too short
state = {};
character.c = -1;
r = std::min(initlen, (size_t)((1 << 5) - 1));
goto dfl;
case(size_t)-1: // EILSEQ
state = {};
character.c = -1;
[[fallthrough]];
case 0:
r = 1;
[[fallthrough]];
default:
dfl:
character.seglen = r;
memcpy(character.seg, init, r);
initlen -= r;
init += r;
}
MEASURE(character);
BUMPCHAR();
characters[characters_len++] = character;
}
size_t characters_cursor = characters_len;
#define LEFTBY(howmuch) \
do { \
int moveleft = howmuch; \
while(first_on_screen && moveleft > 0) \
moveleft -= characters[--first_on_screen].width; \
} while(false)
#define RIGHTBY(howmuch) \
do { \
int moveright = howmuch; \
while(first_on_screen != characters_len && moveright > 0) \
moveright -= characters[++first_on_screen].width; \
} while(false)
// Write out from first_on_screen, so long as the cursor fits on the screen, else move by a half-screen to find it.
// Start off with as much text as possible and cursor on the right margin; you can't return to this state; this mimicks how ≤1b did it
size_t first_on_screen = characters_cursor;
LEFTBY((getmaxx(stdscr) - x) - 1);
for(wint_t input;;) {
{
auto screen_width = getmaxx(stdscr) - x;
auto all_characters_width = std::accumulate(characters, characters + characters_len, 0z, [](auto acc, auto && c) { return acc + c.width; });
if(all_characters_width < screen_width)
first_on_screen = 0;
else {
if(first_on_screen >= characters_len) {
first_on_screen = characters_cursor - 1;
LEFTBY(screen_width / 2);
} else if(characters_cursor < first_on_screen)
while(characters_cursor < first_on_screen)
LEFTBY(screen_width / 2);
else
for(;;) {
auto last = std::find_if(characters + first_on_screen, characters + characters_len, [&, acc = 0z](auto && c) mutable {
acc += c.width;
return acc > screen_width;
});
auto characters_on_screen = last - (characters + first_on_screen);
if(first_on_screen + characters_on_screen < characters_cursor)
RIGHTBY(screen_width / 2);
else
break;
}
}
move(y, x);
auto cursor_x = x;
for(auto itr = characters + first_on_screen; itr != characters + characters_len; ++itr) {
if(itr->width <= screen_width)
screen_width -= itr->width;
else
break;
addnwstr(&itr->c, 1);
if(itr < characters + characters_cursor)
cursor_x += itr->width;
}
clrtoeol();
move(y, cursor_x);
}
switch(km_dokey(&input)) {
case -1:
return free(characters), (struct enter_string){};
case OP_EDITOR_CHAR:
if(iswprint(input)) {
struct character character = {};
character.c = input;
int newlen = wctomb(character.seg, input);
if(newlen == -1)
goto err;
character.seglen = newlen;
MEASURE(character);
BUMPCHAR();
memmove(characters + characters_cursor + 1, characters + characters_cursor, (characters_len - characters_cursor) * sizeof(*characters));
++characters_len;
characters[characters_cursor++] = character;
} else {
err:
flushinp();
beep();
}
break;
case OP_EDITOR_DONE: {
struct enter_string ret = {0, std::accumulate(characters, characters + characters_len, 0zu, [](auto acc, auto && c) { return acc + c.seglen; })};
if(!ret.len)
return free(characters), (struct enter_string){};
ret.data = reinterpret_cast<char *>(malloc(ret.len + 1));
if(!ret.data)
return free(characters), (struct enter_string){};
auto acc = ret.data;
for(auto itr = characters; itr != characters + characters_len; ++itr)
acc = reinterpret_cast<char *>(memcpy(acc, itr->seg, itr->seglen)) + itr->seglen;
*acc = '\0';
return free(characters), ret;
} break;
case OP_EDITOR_RESIZE:
break;
case OP_EDITOR_IDK:
beep();
break;
case OP_EDITOR_BACKSPACE:
if(!characters_cursor)
beep();
else {
memmove(characters + characters_cursor - 1, characters + characters_cursor, (characters_len - characters_cursor) * sizeof(*characters));
--characters_len;
--characters_cursor;
}
break;
case OP_EDITOR_DELETE_CHAR:
if(characters_cursor == characters_len)
beep();
else {
memmove(characters + characters_cursor, characters + characters_cursor + 1, (characters_len - (characters_cursor + 1)) * sizeof(*characters));
--characters_len;
}
break;
case OP_EDITOR_KILL_LINE:
characters_len = characters_cursor = 0;
break;
case OP_EDITOR_KILL_EOL:
characters_len = characters_cursor;
break;
case OP_EDITOR_KILL_WORD: {
if(!characters_cursor)
break;
auto end = characters_cursor;
--characters_cursor;
while(characters_cursor && characters[characters_cursor - 1].space)
--characters_cursor;
while(characters_cursor && characters[characters_cursor - 1].word)
--characters_cursor;
memmove(characters + characters_cursor, characters + end, (characters_len - end) * sizeof(*characters));
characters_len -= end - characters_cursor;
} break;
case OP_EDITOR_BOL:
characters_cursor = 0;
break;
case OP_EDITOR_EOL:
characters_cursor = characters_len;
break;
case OP_EDITOR_BACKWARD_CHAR:
if(!characters_cursor)
beep();
else
--characters_cursor;
break;
case OP_EDITOR_FORWARD_CHAR:
if(characters_cursor == characters_len)
beep();
else
++characters_cursor;
break;
}
}
}
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