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/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <err.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sysexits.h>
#include <wchar.h>
#include <wctype.h>
#include "chat.h"
enum { BUF_LEN = 512 };
static struct {
wchar_t buf[BUF_LEN];
wchar_t *ptr;
wchar_t *end;
wchar_t *tab;
} line = {
.ptr = line.buf,
.end = line.buf,
};
// XXX: editTail must always be called after editHead.
static wchar_t tail;
const wchar_t *editHead(void) {
tail = *line.ptr;
*line.ptr = L'\0';
return line.buf;
}
const wchar_t *editTail(void) {
if (tail) *line.ptr = tail;
*line.end = L'\0';
tail = L'\0';
return line.ptr;
}
static void left(void) {
if (line.ptr > line.buf) line.ptr--;
}
static void right(void) {
if (line.ptr < line.end) line.ptr++;
}
static void backWord(void) {
left();
editHead();
wchar_t *word = wcsrchr(line.buf, ' ');
editTail();
line.ptr = (word ? &word[1] : line.buf);
}
static void foreWord(void) {
right();
editTail();
wchar_t *word = wcschr(line.ptr, ' ');
line.ptr = (word ? word : line.end);
}
static void insert(wchar_t ch) {
if (line.end == &line.buf[BUF_LEN - 1]) return;
if (line.ptr != line.end) {
wmemmove(line.ptr + 1, line.ptr, line.end - line.ptr);
}
*line.ptr++ = ch;
line.end++;
}
static void backspace(void) {
if (line.ptr == line.buf) return;
if (line.ptr != line.end) {
wmemmove(line.ptr - 1, line.ptr, line.end - line.ptr);
}
line.ptr--;
line.end--;
}
static void delete(void) {
if (line.ptr == line.end) return;
right();
backspace();
}
static void killBackWord(void) {
wchar_t *from = line.ptr;
backWord();
wmemmove(line.ptr, from, line.end - from);
line.end -= from - line.ptr;
}
static void killForeWord(void) {
wchar_t *from = line.ptr;
foreWord();
wmemmove(from, line.ptr, line.end - line.ptr);
line.end -= line.ptr - from;
line.ptr = from;
}
static char *prefix;
static void complete(struct Tag tag) {
if (!line.tab) {
editHead();
line.tab = wcsrchr(line.buf, L' ');
line.tab = (line.tab ? &line.tab[1] : line.buf);
prefix = awcstombs(line.tab);
if (!prefix) err(EX_DATAERR, "awcstombs");
editTail();
}
const char *next = tabNext(tag, prefix);
if (!next) return;
wchar_t *wcs = ambstowcs(next);
if (!wcs) err(EX_DATAERR, "ambstowcs");
size_t i = 0;
for (; wcs[i] && line.ptr > &line.tab[i]; ++i) {
line.tab[i] = wcs[i];
}
while (line.ptr > &line.tab[i]) {
backspace();
}
for (; wcs[i]; ++i) {
insert(wcs[i]);
}
free(wcs);
size_t pos = line.tab - line.buf;
if (!pos && line.tab[0] != L'/') {
insert(L':');
} else if (pos >= 2) {
if (line.buf[pos - 2] == L':' || line.buf[pos - 2] == L',') {
line.buf[pos - 2] = L',';
insert(L':');
}
}
insert(L' ');
}
static void accept(void) {
if (!line.tab) return;
line.tab = NULL;
free(prefix);
tabAccept();
}
static void reject(void) {
if (!line.tab) return;
line.tab = NULL;
free(prefix);
tabReject();
}
static void enter(struct Tag tag) {
if (line.end == line.buf) return;
editTail();
char *str = awcstombs(line.buf);
if (!str) err(EX_DATAERR, "awcstombs");
input(tag, str);
free(str);
line.ptr = line.buf;
line.end = line.buf;
}
void edit(struct Tag tag, enum Edit op, wchar_t ch) {
switch (op) {
break; case EDIT_LEFT: reject(); left();
break; case EDIT_RIGHT: reject(); right();
break; case EDIT_HOME: reject(); line.ptr = line.buf;
break; case EDIT_END: reject(); line.ptr = line.end;
break; case EDIT_BACK_WORD: reject(); backWord();
break; case EDIT_FORE_WORD: reject(); foreWord();
break; case EDIT_INSERT: accept(); insert(ch);
break; case EDIT_BACKSPACE: reject(); backspace();
break; case EDIT_DELETE: reject(); delete();
break; case EDIT_KILL_BACK_WORD: reject(); killBackWord();
break; case EDIT_KILL_FORE_WORD: reject(); killForeWord();
break; case EDIT_KILL_LINE: reject(); line.end = line.ptr;
break; case EDIT_COMPLETE: complete(tag);
break; case EDIT_ENTER: accept(); enter(tag);
}
}
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