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catboy/ui.c

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/* Copyright (C) 2020 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#define _XOPEN_SOURCE_EXTENDED
#include <assert.h>
#include <ctype.h>
#include <curses.h>
#include <err.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <term.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
#include "chat.h"
// Annoying stuff from <term.h>:
#undef lines
#ifndef A_ITALIC
#define A_ITALIC A_NORMAL
#endif
#define BOTTOM (LINES - 1)
#define RIGHT (COLS - 1)
#define PAGE_LINES (LINES - 2)
static WINDOW *status;
static WINDOW *marker;
static WINDOW *input;
enum { BufferCap = 512 };
struct Buffer {
time_t times[BufferCap];
char *lines[BufferCap];
size_t len;
};
static_assert(!(BufferCap & (BufferCap - 1)), "BufferCap is power of two");
static void bufferPush(struct Buffer *buffer, time_t time, const char *line) {
size_t i = buffer->len++ % BufferCap;
free(buffer->lines[i]);
buffer->times[i] = time;
buffer->lines[i] = strdup(line);
if (!buffer->lines[i]) err(EX_OSERR, "strdup");
}
enum { WindowLines = BufferCap };
struct Window {
size_t id;
struct Buffer buffer;
WINDOW *pad;
int scroll;
bool mark;
enum Heat heat;
int unreadCount;
int unreadLines;
struct Window *prev;
struct Window *next;
};
static struct {
struct Window *active;
struct Window *other;
struct Window *head;
struct Window *tail;
} windows;
static void windowAdd(struct Window *window) {
if (windows.tail) windows.tail->next = window;
window->prev = windows.tail;
window->next = NULL;
windows.tail = window;
if (!windows.head) windows.head = window;
}
static void windowRemove(struct Window *window) {
if (window->prev) window->prev->next = window->next;
if (window->next) window->next->prev = window->prev;
if (windows.head == window) windows.head = window->next;
if (windows.tail == window) windows.tail = window->prev;
}
static struct Window *windowFor(size_t id) {
struct Window *window;
for (window = windows.head; window; window = window->next) {
if (window->id == id) return window;
}
window = calloc(1, sizeof(*window));
if (!window) err(EX_OSERR, "malloc");
window->id = id;
window->pad = newpad(WindowLines, COLS);
if (!window->pad) err(EX_OSERR, "newpad");
scrollok(window->pad, true);
wmove(window->pad, WindowLines - 1, 0);
window->mark = true;
windowAdd(window);
return window;
}
static short colorPairs;
static void colorInit(void) {
start_color();
use_default_colors();
for (short pair = 0; pair < 16; ++pair) {
init_pair(1 + pair, pair % COLORS, -1);
}
colorPairs = 17;
}
static attr_t colorAttr(short fg) {
if (fg != COLOR_BLACK && fg % COLORS == COLOR_BLACK) return A_BOLD;
if (COLORS > 8) return A_NORMAL;
return (fg / COLORS & 1 ? A_BOLD : A_NORMAL);
}
static short colorPair(short fg, short bg) {
fg %= COLORS;
bg %= COLORS;
if (bg == -1 && fg < 16) return 1 + fg;
for (short pair = 17; pair < colorPairs; ++pair) {
short f, b;
pair_content(pair, &f, &b);
if (f == fg && b == bg) return pair;
}
init_pair(colorPairs, fg, bg);
return colorPairs++;
}
// XXX: Assuming terminals will be fine with these even if they're unsupported,
// since they're "private" modes.
static const char *EnterFocusMode = "\33[?1004h";
static const char *ExitFocusMode = "\33[?1004l";
static const char *EnterPasteMode = "\33[?2004h";
static const char *ExitPasteMode = "\33[?2004l";
static bool hidden;
static bool waiting;
void uiShow(void) {
putp(EnterFocusMode);
putp(EnterPasteMode);
fflush(stdout);
hidden = false;
}
void uiHide(void) {
hidden = true;
putp(ExitFocusMode);
putp(ExitPasteMode);
endwin();
}
// Gain use of C-q, C-s, C-z, C-y, C-o.
static void acquireKeys(void) {
struct termios term;
int error = tcgetattr(STDOUT_FILENO, &term);
if (error) err(EX_OSERR, "tcgetattr");
term.c_iflag &= ~IXON;
term.c_cc[VSUSP] = _POSIX_VDISABLE;
term.c_cc[VDSUSP] = _POSIX_VDISABLE;
term.c_cc[VDISCARD] = _POSIX_VDISABLE;
error = tcsetattr(STDOUT_FILENO, TCSADRAIN, &term);
if (error) err(EX_OSERR, "tcsetattr");
}
static void errExit(void) {
reset_shell_mode();
}
#define ENUM_KEY \
X(KeyMeta0, "\0330") \
X(KeyMeta1, "\0331") \
X(KeyMeta2, "\0332") \
X(KeyMeta3, "\0333") \
X(KeyMeta4, "\0334") \
X(KeyMeta5, "\0335") \
X(KeyMeta6, "\0336") \
X(KeyMeta7, "\0337") \
X(KeyMeta8, "\0338") \
X(KeyMeta9, "\0339") \
X(KeyMetaA, "\33a") \
X(KeyMetaB, "\33b") \
X(KeyMetaD, "\33d") \
X(KeyMetaF, "\33f") \
X(KeyMetaL, "\33l") \
X(KeyMetaM, "\33m") \
X(KeyMetaU, "\33u") \
X(KeyMetaSlash, "\33/") \
X(KeyFocusIn, "\33[I") \
X(KeyFocusOut, "\33[O") \
X(KeyPasteOn, "\33[200~") \
X(KeyPasteOff, "\33[201~")
enum {
KeyMax = KEY_MAX,
#define X(id, seq) id,
ENUM_KEY
#undef X
};
void uiInit(void) {
initscr();
cbreak();
noecho();
acquireKeys();
def_prog_mode();
atexit(errExit);
colorInit();
if (!to_status_line && !strncmp(termname(), "xterm", 5)) {
to_status_line = "\33]2;";
from_status_line = "\7";
}
#define X(id, seq) define_key(seq, id);
ENUM_KEY
#undef X
status = newwin(1, COLS, 0, 0);
if (!status) err(EX_OSERR, "newwin");
marker = newwin(1, COLS, LINES - 2, 0);
short fg = 8 + COLOR_BLACK;
wbkgd(marker, '~' | colorAttr(fg) | COLOR_PAIR(colorPair(fg, -1)));
input = newpad(1, 512);
if (!input) err(EX_OSERR, "newpad");
keypad(input, true);
nodelay(input, true);
windows.active = windowFor(Network);
uiShow();
}
void uiDraw(void) {
if (hidden) return;
wnoutrefresh(status);
struct Window *window = windows.active;
pnoutrefresh(
window->pad,
WindowLines - window->scroll - PAGE_LINES + !!window->scroll, 0,
1, 0,
BOTTOM - 1 - !!window->scroll, RIGHT
);
if (window->scroll) {
touchwin(marker);
wnoutrefresh(marker);
}
int y, x;
getyx(input, y, x);
pnoutrefresh(
input,
0, (x + 1 > RIGHT ? x + 1 - RIGHT : 0),
BOTTOM, 0,
BOTTOM, RIGHT
);
doupdate();
}
struct Style {
attr_t attr;
enum Color fg, bg;
};
static const struct Style Reset = { A_NORMAL, Default, Default };
static const short Colors[100] = {
[Default] = -1,
[White] = 8 + COLOR_WHITE,
[Black] = 0 + COLOR_BLACK,
[Blue] = 0 + COLOR_BLUE,
[Green] = 0 + COLOR_GREEN,
[Red] = 8 + COLOR_RED,
[Brown] = 0 + COLOR_RED,
[Magenta] = 0 + COLOR_MAGENTA,
[Orange] = 0 + COLOR_YELLOW,
[Yellow] = 8 + COLOR_YELLOW,
[LightGreen] = 8 + COLOR_GREEN,
[Cyan] = 0 + COLOR_CYAN,
[LightCyan] = 8 + COLOR_CYAN,
[LightBlue] = 8 + COLOR_BLUE,
[Pink] = 8 + COLOR_MAGENTA,
[Gray] = 8 + COLOR_BLACK,
[LightGray] = 0 + COLOR_WHITE,
52, 94, 100, 58, 22, 29, 23, 24, 17, 54, 53, 89,
88, 130, 142, 64, 28, 35, 30, 25, 18, 91, 90, 125,
124, 166, 184, 106, 34, 49, 37, 33, 19, 129, 127, 161,
196, 208, 226, 154, 46, 86, 51, 75, 21, 171, 201, 198,
203, 215, 227, 191, 83, 122, 87, 111, 63, 177, 207, 205,
217, 223, 229, 193, 157, 158, 159, 153, 147, 183, 219, 212,
16, 233, 235, 237, 239, 241, 244, 247, 250, 254, 231,
};
enum { B = '\2', C = '\3', O = '\17', R = '\26', I = '\35', U = '\37' };
static void styleParse(struct Style *style, const char **str, size_t *len) {
switch (**str) {
break; case B: (*str)++; style->attr ^= A_BOLD;
break; case O: (*str)++; *style = Reset;
break; case R: (*str)++; style->attr ^= A_REVERSE;
break; case I: (*str)++; style->attr ^= A_ITALIC;
break; case U: (*str)++; style->attr ^= A_UNDERLINE;
break; case C: {
(*str)++;
if (!isdigit(**str)) {
style->fg = Default;
style->bg = Default;
break;
}
style->fg = *(*str)++ - '0';
if (isdigit(**str)) style->fg = style->fg * 10 + *(*str)++ - '0';
if ((*str)[0] != ',' || !isdigit((*str)[1])) break;
(*str)++;
style->bg = *(*str)++ - '0';
if (isdigit(**str)) style->bg = style->bg * 10 + *(*str)++ - '0';
}
}
*len = strcspn(*str, (const char[]) { B, C, O, R, I, U, '\0' });
}
static void statusAdd(const char *str) {
size_t len;
struct Style style = Reset;
while (*str) {
styleParse(&style, &str, &len);
wattr_set(
status,
style.attr | colorAttr(Colors[style.fg]),
colorPair(Colors[style.fg], Colors[style.bg]),
NULL
);
waddnstr(status, str, len);
str += len;
}
}
static void statusUpdate(void) {
int otherUnread = 0;
enum Heat otherHeat = Cold;
wmove(status, 0, 0);
int num;
const struct Window *window;
for (num = 0, window = windows.head; window; ++num, window = window->next) {
if (!window->heat && window != windows.active) continue;
if (window != windows.active) {
otherUnread += window->unreadCount;
if (window->heat > otherHeat) otherHeat = window->heat;
}
int trunc;
char buf[256];
snprintf(
buf, sizeof(buf), "\3%d%s %d %s %n(\3%02d%d\3%d) ",
idColors[window->id], (window == windows.active ? "\26" : ""),
num, idNames[window->id],
&trunc, (window->heat > Warm ? White : idColors[window->id]),
window->unreadCount,
idColors[window->id]
);
if (!window->mark || !window->unreadCount) buf[trunc] = '\0';
statusAdd(buf);
}
wclrtoeol(status);
if (!to_status_line) return;
window = windows.active;
putp(to_status_line);
printf("%s %s", self.network, idNames[window->id]);
if (window->mark && window->unreadCount) {
printf(
" (%d%s)", window->unreadCount, (window->heat > Warm ? "!" : "")
);
}
if (otherUnread) {
printf(" (+%d%s)", otherUnread, (otherHeat > Warm ? "!" : ""));
}
putp(from_status_line);
fflush(stdout);
}
static void mark(struct Window *window) {
if (window->scroll) return;
window->mark = true;
window->unreadCount = 0;
window->unreadLines = 0;
}
static void unmark(struct Window *window) {
if (!window->scroll) {
window->mark = false;
window->heat = Cold;
}
statusUpdate();
}
static void windowScroll(struct Window *window, int n) {
mark(window);
window->scroll += n;
if (window->scroll > WindowLines - PAGE_LINES) {
window->scroll = WindowLines - PAGE_LINES;
}
if (window->scroll < 0) window->scroll = 0;
unmark(window);
}
static void windowScrollUnread(struct Window *window) {
window->scroll = 0;
windowScroll(window, window->unreadLines - PAGE_LINES + 1);
}
static int wordWidth(const char *str) {
size_t len = strcspn(str, " ");
int width = 0;
while (len) {
wchar_t wc;
int n = mbtowc(&wc, str, len);
if (n < 1) return width + len;
width += (iswprint(wc) ? wcwidth(wc) : 0);
str += n;
len -= n;
}
return width;
}
static int wordWrap(WINDOW *win, const char *str) {
int y, x, width;
getmaxyx(win, y, width);
size_t len;
int lines = 0;
int align = 0;
struct Style style = Reset;
while (*str) {
if (*str == '\t') {
if (align) {
waddch(win, '\t');
str++;
} else {
waddch(win, ' ');
getyx(win, y, align);
str++;
}
} else if (*str == ' ') {
getyx(win, y, x);
const char *word = &str[strspn(str, " ")];
if (width - x - 1 <= wordWidth(word)) {
lines += 1 + (align + wordWidth(word)) / width;
waddch(win, '\n');
getyx(win, y, x);
wmove(win, y, align);
str = word;
} else {
waddch(win, ' ');
str++;
}
}
styleParse(&style, &str, &len);
size_t ws = strcspn(str, "\t ");
if (ws < len) len = ws;
wattr_set(
win,
style.attr | colorAttr(Colors[style.fg]),
colorPair(Colors[style.fg], Colors[style.bg]),
NULL
);
waddnstr(win, str, len);
str += len;
}
return lines;
}
void uiWrite(size_t id, enum Heat heat, const time_t *src, const char *str) {
struct Window *window = windowFor(id);
time_t clock = (src ? *src : time(NULL));
bufferPush(&window->buffer, clock, str);
int lines = 1;
waddch(window->pad, '\n');
if (window->mark && heat > Cold) {
if (!window->unreadCount++) {
lines++;
waddch(window->pad, '\n');
}
if (window->heat < heat) window->heat = heat;
statusUpdate();
}
lines += wordWrap(window->pad, str);
window->unreadLines += lines;
if (window->scroll) windowScroll(window, lines);
if (heat > Warm) beep();
}
void uiFormat(
size_t id, enum Heat heat, const time_t *time, const char *format, ...
) {
char buf[1024];
va_list ap;
va_start(ap, format);
int len = vsnprintf(buf, sizeof(buf), format, ap);
va_end(ap);
assert((size_t)len < sizeof(buf));
uiWrite(id, heat, time, buf);
}
static void reflow(struct Window *window) {
werase(window->pad);
wmove(window->pad, WindowLines - 1, 0);
window->unreadLines = 0;
struct Buffer *buffer = &window->buffer;
for (size_t i = 0; i < BufferCap; ++i) {
char *line = buffer->lines[(buffer->len + i) % BufferCap];
if (!line) continue;
waddch(window->pad, '\n');
if (i >= (size_t)(BufferCap - window->unreadCount)) {
window->unreadLines += 1 + wordWrap(window->pad, line);
} else {
wordWrap(window->pad, line);
}
}
}
static void resize(void) {
mvwin(marker, LINES - 2, 0);
int height, width;
getmaxyx(windows.active->pad, height, width);
if (width == COLS) return;
for (struct Window *window = windows.head; window; window = window->next) {
wresize(window->pad, BufferCap, COLS);
reflow(window);
}
statusUpdate();
}
static void bufferList(struct Buffer *buffer) {
uiHide();
waiting = true;
for (size_t i = 0; i < BufferCap; ++i) {
time_t time = buffer->times[(buffer->len + i) % BufferCap];
const char *line = buffer->lines[(buffer->len + i) % BufferCap];
if (!line) continue;
struct tm *tm = localtime(&time);
if (!tm) continue;
char buf[sizeof("[00:00:00]")];
strftime(buf, sizeof(buf), "[%T]", tm);
vid_attr(colorAttr(Colors[Gray]), colorPair(Colors[Gray], -1), NULL);
printf("%s\t", buf);
size_t len;
struct Style style = Reset;
while (*line) {
styleParse(&style, &line, &len);
vid_attr(
style.attr | colorAttr(Colors[style.fg]),
colorPair(Colors[style.fg], Colors[style.bg]),
NULL
);
if (len) printf("%.*s", (int)len, line);
line += len;
}
printf("\n");
}
}
static void inputAdd(struct Style *style, const char *str) {
size_t len;
while (*str) {
const char *code = str;
styleParse(style, &str, &len);
wattr_set(input, A_BOLD | A_REVERSE, 0, NULL);
switch (*code) {
break; case B: waddch(input, 'B');
break; case C: waddch(input, 'C');
break; case O: waddch(input, 'O');
break; case R: waddch(input, 'R');
break; case I: waddch(input, 'I');
break; case U: waddch(input, 'U');
}
if (str - code > 1) waddnstr(input, &code[1], str - &code[1]);
wattr_set(
input,
style->attr | colorAttr(Colors[style->fg]),
colorPair(Colors[style->fg], Colors[style->bg]),
NULL
);
waddnstr(input, str, len);
str += len;
}
}
static void inputUpdate(void) {
size_t id = windows.active->id;
size_t pos;
char *buf = editBuffer(&pos);
const char *skip = NULL;
struct Style init = { .fg = self.color, .bg = Default };
struct Style rest = Reset;
const char *prefix = "";
const char *prompt = (self.nick ? self.nick : "");
const char *suffix = "";
if (NULL != (skip = commandIsPrivmsg(id, buf))) {
prefix = "<"; suffix = "> ";
} else if (NULL != (skip = commandIsNotice(id, buf))) {
prefix = "-"; suffix = "- ";
rest.fg = LightGray;
} else if (NULL != (skip = commandIsAction(id, buf))) {
init.attr |= A_ITALIC;
prefix = "* "; suffix = " ";
rest.attr |= A_ITALIC;
} else if (id == Debug) {
skip = buf;
init.fg = Gray;
prompt = "<< ";
} else {
prompt = "";
}
if (skip && skip > &buf[pos]) {
skip = NULL;
prefix = prompt = suffix = "";
}
int y, x;
wmove(input, 0, 0);
wattr_set(
input,
init.attr | colorAttr(Colors[init.fg]),
colorPair(Colors[init.fg], Colors[init.bg]),
NULL
);
waddstr(input, prefix);
waddstr(input, prompt);
waddstr(input, suffix);
struct Style style = rest;
char p = buf[pos];
buf[pos] = '\0';
inputAdd(&style, (skip ? skip : buf));
getyx(input, y, x);
buf[pos] = p;
inputAdd(&style, &buf[pos]);
wclrtoeol(input);
wmove(input, y, x);
}
static void windowShow(struct Window *window) {
if (!window) return;
touchwin(window->pad);
windows.other = windows.active;
windows.active = window;
mark(windows.other);
unmark(windows.active);
inputUpdate();
}
void uiShowID(size_t id) {
windowShow(windowFor(id));
}
void uiShowNum(size_t num) {
struct Window *window = windows.head;
for (size_t i = 0; i < num; ++i) {
window = window->next;
if (!window) return;
}
windowShow(window);
}
static void windowClose(struct Window *window) {
if (window->id == Network) return;
if (windows.active == window) {
if (windows.other && windows.other != window) {
windowShow(windows.other);
} else {
windowShow(window->prev ? window->prev : window->next);
}
}
if (windows.other == window) windows.other = NULL;
windowRemove(window);
for (size_t i = 0; i < BufferCap; ++i) {
free(window->buffer.lines[i]);
}
delwin(window->pad);
free(window);
statusUpdate();
}
void uiCloseID(size_t id) {
windowClose(windowFor(id));
}
void uiCloseNum(size_t num) {
struct Window *window = windows.head;
for (size_t i = 0; i < num; ++i) {
window = window->next;
if (!window) return;
}
windowClose(window);
}
static void showAuto(void) {
static struct Window *other;
if (windows.other != other) {
other = windows.active;
}
for (struct Window *window = windows.head; window; window = window->next) {
if (window->heat < Hot) continue;
windowShow(window);
windows.other = other;
return;
}
for (struct Window *window = windows.head; window; window = window->next) {
if (window->heat < Warm) continue;
windowShow(window);
windows.other = other;
return;
}
windowShow(windows.other);
}
static void keyCode(int code) {
struct Window *window = windows.active;
size_t id = window->id;
switch (code) {
break; case KEY_RESIZE: resize();
break; case KeyFocusIn: unmark(window);
break; case KeyFocusOut: mark(window);
break; case KeyPasteOn:; // TODO
break; case KeyPasteOff:; // TODO
break; case KeyMetaSlash: windowShow(windows.other);
break; case KeyMetaA: showAuto();
break; case KeyMetaB: edit(id, EditPrevWord, 0);
break; case KeyMetaD: edit(id, EditDeleteNextWord, 0);
break; case KeyMetaF: edit(id, EditNextWord, 0);
break; case KeyMetaL: bufferList(&window->buffer);
break; case KeyMetaM: waddch(window->pad, '\n');
break; case KeyMetaU: windowScrollUnread(window);
break; case KEY_BACKSPACE: edit(id, EditDeletePrev, 0);
break; case KEY_DC: edit(id, EditDeleteNext, 0);
break; case KEY_DOWN: windowScroll(window, -1);
break; case KEY_END: edit(id, EditTail, 0);
break; case KEY_ENTER: edit(id, EditEnter, 0);
break; case KEY_HOME: edit(id, EditHead, 0);
break; case KEY_LEFT: edit(id, EditPrev, 0);
break; case KEY_NPAGE: windowScroll(window, -(PAGE_LINES - 2));
break; case KEY_PPAGE: windowScroll(window, +(PAGE_LINES - 2));
break; case KEY_RIGHT: edit(id, EditNext, 0);
break; case KEY_UP: windowScroll(window, +1);
break; default: {
if (code >= KeyMeta0 && code <= KeyMeta9) {
uiShowNum(code - KeyMeta0);
}
}
}
}
static void keyCtrl(wchar_t ch) {
size_t id = windows.active->id;
switch (ch ^ L'@') {
break; case L'?': edit(id, EditDeletePrev, 0);
break; case L'A': edit(id, EditHead, 0);
break; case L'B': edit(id, EditPrev, 0);
break; case L'D': edit(id, EditDeleteNext, 0);
break; case L'E': edit(id, EditTail, 0);
break; case L'F': edit(id, EditNext, 0);
break; case L'H': edit(id, EditDeletePrev, 0);
break; case L'I': edit(id, EditComplete, 0);
break; case L'J': edit(id, EditEnter, 0);
break; case L'K': edit(id, EditDeleteTail, 0);
break; case L'L': clearok(curscr, true);
break; case L'N': windowShow(windows.active->next);
break; case L'P': windowShow(windows.active->prev);
break; case L'U': edit(id, EditDeleteHead, 0);
break; case L'W': edit(id, EditDeletePrevWord, 0);
break; case L'Y': edit(id, EditPaste, 0);
}
}
static void keyStyle(wchar_t ch) {
size_t id = windows.active->id;
switch (iswcntrl(ch) ? ch ^ L'@' : towupper(ch)) {
break; case L'B': edit(id, EditInsert, B);
break; case L'C': edit(id, EditInsert, C);
break; case L'I': edit(id, EditInsert, I);
break; case L'O': edit(id, EditInsert, O);
break; case L'R': edit(id, EditInsert, R);
break; case L'U': edit(id, EditInsert, U);
}
}
void uiRead(void) {
if (hidden) {
if (waiting) {
uiShow();
flushinp();
waiting = false;
} else {
return;
}
}
int ret;
wint_t ch;
static bool style;
while (ERR != (ret = wget_wch(input, &ch))) {
if (ret == KEY_CODE_YES) {
keyCode(ch);
} else if (ch == (L'Z' ^ L'@')) {
style = true;
continue;
} else if (style) {
keyStyle(ch);
} else if (iswcntrl(ch)) {
keyCtrl(ch);
} else {
edit(windows.active->id, EditInsert, ch);
}
style = false;
}
inputUpdate();
}
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