1 #include "terminal_ui.hh"
2
3 #include "display_buffer.hh"
4 #include "event_manager.hh"
5 #include "exception.hh"
6 #include "file.hh"
7 #include "keys.hh"
8 #include "ranges.hh"
9 #include "string_utils.hh"
10 #include "diff.hh"
11
12 #include <algorithm>
13
14 #include <fcntl.h>
15 #include <csignal>
16 #include <sys/ioctl.h>
17 #include <unistd.h>
18 #include <strings.h>
19
20 namespace Kakoune
21 {
22
23 using std::min;
24 using std::max;
25
fix_atom_text(StringView str)26 static String fix_atom_text(StringView str)
27 {
28 String res;
29 auto pos = str.begin();
30 for (auto it = str.begin(), end = str.end(); it != end; ++it)
31 {
32 char c = *it;
33 if (c >= 0 and c <= 0x1F)
34 {
35 res += StringView{pos, it};
36 res += String{Codepoint{(uint32_t)(0x2400 + c)}};
37 pos = it+1;
38 }
39 }
40 res += StringView{pos, str.end()};
41 return res;
42 }
43
44 struct TerminalUI::Window::Line
45 {
46 struct Atom
47 {
48 String text;
49 ColumnCount skip = 0;
50 Face face;
51
lengthKakoune::TerminalUI::Window::Line::Atom52 ColumnCount length() const { return text.column_length() + skip; }
resizeKakoune::TerminalUI::Window::Line::Atom53 void resize(ColumnCount size)
54 {
55 auto it = text.begin(), end = text.end();
56 while (it != end and size > 0)
57 size -= codepoint_width(utf8::read_codepoint(it, end));
58
59 if (size < 0) // possible if resizing to the middle of a double-width codepoint
60 {
61 kak_assert(size == -1);
62 utf8::to_previous(it, text.begin());
63 skip = 1;
64 }
65 else
66 skip = size;
67 text.resize(it - text.begin(), 0);
68 }
69
operator ==Kakoune::TerminalUI::Window::Line70 friend bool operator==(const Atom& lhs, const Atom& rhs) { return lhs.text == rhs.text and lhs.skip == rhs.skip and lhs.face == rhs.face; }
operator !=Kakoune::TerminalUI::Window::Line71 friend bool operator!=(const Atom& lhs, const Atom& rhs) { return not (lhs == rhs); }
hash_valueKakoune::TerminalUI::Window::Line72 friend size_t hash_value(const Atom& atom) { return hash_values(atom.text, atom.skip, atom.face); }
73 };
74
appendKakoune::TerminalUI::Window::Line75 void append(StringView text, ColumnCount skip, Face face)
76 {
77 if (not atoms.empty() and atoms.back().face == face and (atoms.back().skip == 0 or text.empty()))
78 {
79 atoms.back().text += fix_atom_text(text);
80 atoms.back().skip += skip;
81 }
82 else
83 atoms.push_back({fix_atom_text(text), skip, face});
84 }
85
resizeKakoune::TerminalUI::Window::Line86 void resize(ColumnCount width)
87 {
88 auto it = atoms.begin();
89 ColumnCount column = 0;
90 for (; it != atoms.end() and column < width; ++it)
91 column += it->length();
92
93 if (column < width)
94 append({}, width - column, atoms.empty() ? Face{} : atoms.back().face);
95 else
96 {
97 atoms.erase(it, atoms.end());
98 if (column > width)
99 atoms.back().resize(atoms.back().length() - (column - width));
100 }
101 }
102
erase_rangeKakoune::TerminalUI::Window::Line103 Vector<Atom>::iterator erase_range(ColumnCount pos, ColumnCount len)
104 {
105 struct Pos{ Vector<Atom>::iterator it; ColumnCount column; };
106 auto find_col = [pos=0_col, it=atoms.begin(), end=atoms.end()](ColumnCount col) mutable {
107 for (; it != end; ++it)
108 {
109 auto atom_len = it->length();
110 if (pos + atom_len >= col)
111 return Pos{it, col - pos};
112 pos += atom_len;
113 }
114 return Pos{it, 0_col};
115 };
116 Pos begin = find_col(pos);
117 Pos end = find_col(pos+len);
118
119 auto make_tail = [](const Atom& atom, ColumnCount from) {
120 auto it = atom.text.begin(), end = atom.text.end();
121 while (it != end and from > 0)
122 from -= codepoint_width(utf8::read_codepoint(it, end));
123
124 if (from < 0) // can happen if tail starts in the middle of a double-width codepoint
125 {
126 kak_assert(from == -1);
127 return Atom{" " + StringView{it, end}, atom.skip, atom.face};
128 }
129 return Atom{{it, end}, atom.skip - from, atom.face};
130 };
131
132 if (begin.it == end.it)
133 {
134 Atom tail = make_tail(*begin.it, end.column);
135 begin.it->resize(begin.column);
136 return (tail.text.empty() and tail.skip == 0) ? begin.it+1 : atoms.insert(begin.it+1, tail);
137 }
138
139 begin.it->resize(begin.column);
140 if (end.column > 0)
141 {
142 if (end.column == end.it->length())
143 ++end.it;
144 else
145 *end.it = make_tail(*end.it, end.column);
146 }
147 return atoms.erase(begin.it+1, end.it);
148 }
149
150 Vector<Atom> atoms;
151 };
152
create(const DisplayCoord & p,const DisplayCoord & s)153 void TerminalUI::Window::create(const DisplayCoord& p, const DisplayCoord& s)
154 {
155 kak_assert(p.line >= 0 and p.column >= 0);
156 kak_assert(s.line >= 0 and s.column >= 0);
157 pos = p;
158 size = s;
159 lines.reset(new Line[(int)size.line]);
160 }
161
destroy()162 void TerminalUI::Window::destroy()
163 {
164 pos = DisplayCoord{};
165 size = DisplayCoord{};
166 lines.reset();
167 }
168
blit(Window & target)169 void TerminalUI::Window::blit(Window& target)
170 {
171 kak_assert(pos.line < target.size.line);
172 LineCount line_index = pos.line;
173 for (auto& line : ArrayView{lines.get(), (size_t)size.line})
174 {
175 line.resize(size.column);
176 auto& target_line = target.lines[(size_t)line_index];
177 target_line.resize(target.size.column);
178 target_line.atoms.insert(target_line.erase_range(pos.column, size.column), line.atoms.begin(), line.atoms.end());
179 if (++line_index == target.size.line)
180 break;
181 }
182 }
183
draw(DisplayCoord pos,ConstArrayView<DisplayAtom> atoms,const Face & default_face)184 void TerminalUI::Window::draw(DisplayCoord pos,
185 ConstArrayView<DisplayAtom> atoms,
186 const Face& default_face)
187 {
188 if (pos.line >= size.line) // We might receive an out of date draw command after a resize
189 return;
190
191 lines[(size_t)pos.line].resize(pos.column);
192 for (const DisplayAtom& atom : atoms)
193 {
194 StringView content = atom.content();
195 if (content.empty())
196 continue;
197
198 auto face = merge_faces(default_face, atom.face);
199 if (content.back() == '\n')
200 lines[(int)pos.line].append(content.substr(0, content.length()-1), 1, face);
201 else
202 lines[(int)pos.line].append(content, 0, face);
203 pos.column += content.column_length();
204 }
205
206 if (pos.column < size.column)
207 lines[(int)pos.line].append({}, size.column - pos.column, default_face);
208 }
209
210 struct Writer : BufferedWriter<>
211 {
212 using Writer::BufferedWriter::BufferedWriter;
213 ~Writer() noexcept(false) = default;
214 };
215
216 template<typename... Args>
format_with(Writer & writer,StringView format,Args &&...args)217 static void format_with(Writer& writer, StringView format, Args&&... args)
218 {
219 format_with([&](StringView s) { writer.write(s); }, format, std::forward<Args>(args)...);
220 }
221
set_face(const Face & face,Writer & writer)222 void TerminalUI::Screen::set_face(const Face& face, Writer& writer)
223 {
224 static constexpr int fg_table[]{ 39, 30, 31, 32, 33, 34, 35, 36, 37, 90, 91, 92, 93, 94, 95, 96, 97 };
225 static constexpr int bg_table[]{ 49, 40, 41, 42, 43, 44, 45, 46, 47, 100, 101, 102, 103, 104, 105, 106, 107 };
226 static constexpr int ul_table[]{ 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
227 static constexpr const char* attr_table[]{ "0", "4", "4:3", "7", "5", "1", "2", "3", "9" };
228
229 auto set_color = [&](bool fg, const Color& color, bool join) {
230 if (join)
231 writer.write(";");
232 if (color.isRGB())
233 format_with(writer, "{};2;{};{};{}", fg ? 38 : 48, color.r, color.g, color.b);
234 else
235 format_with(writer, "{}", (fg ? fg_table : bg_table)[(int)(char)color.color]);
236 };
237
238 if (m_active_face == face)
239 return;
240
241 writer.write("\033[");
242 bool join = false;
243 if (face.attributes != m_active_face.attributes)
244 {
245 for (int i = 0; i < std::size(attr_table); ++i)
246 {
247 if (face.attributes & (Attribute)(1 << i))
248 format_with(writer, ";{}", attr_table[i]);
249 }
250 m_active_face.fg = m_active_face.bg = Color::Default;
251 join = true;
252 }
253 if (m_active_face.fg != face.fg)
254 {
255 set_color(true, face.fg, join);
256 join = true;
257 }
258 if (m_active_face.bg != face.bg)
259 {
260 set_color(false, face.bg, join);
261 join = true;
262 }
263 if (m_active_face.underline != face.underline)
264 {
265 if (join)
266 writer.write(";");
267 if (face.underline != Color::Default)
268 {
269 if (face.underline.isRGB())
270 format_with(writer, "58:2::{}:{}:{}", face.underline.r, face.underline.g, face.underline.b);
271 else
272 format_with(writer, "58:5:{}", ul_table[(int)(char)face.underline.color]);
273 }
274 else
275 format_with(writer, "59");
276 }
277 writer.write("m");
278
279 m_active_face = face;
280 }
281
output(bool force,bool synchronized,Writer & writer)282 void TerminalUI::Screen::output(bool force, bool synchronized, Writer& writer)
283 {
284 if (not lines)
285 return;
286
287 if (force)
288 {
289 std::fill_n(hashes.get(), (size_t)size.line, 0);
290 writer.write("\033[m");
291 m_active_face = Face{};
292 }
293
294 auto hash_line = [](const Line& line) {
295 return (hash_value(line.atoms) << 1) | 1; // ensure non-zero
296 };
297
298 auto output_line = [&](const Line& line) {
299 ColumnCount pending_move = 0;
300 for (auto& [text, skip, face] : line.atoms)
301 {
302 if (text.empty() and skip == 0)
303 continue;
304
305 if (pending_move != 0)
306 {
307 format_with(writer, "\033[{}C", (int)pending_move);
308 pending_move = 0;
309 }
310 set_face(face, writer);
311 writer.write(text);
312 if (skip > 3 and face.attributes == Attribute{})
313 {
314 writer.write("\033[K");
315 pending_move = skip;
316 }
317 else if (skip > 0)
318 writer.write(String{' ', skip});
319 }
320 };
321
322 if (synchronized)
323 {
324 writer.write("\033[?2026h"); // begin synchronized update
325
326 struct Change { int keep; int add; int del; };
327 Vector<Change> changes{Change{}};
328 auto new_hashes = ArrayView{lines.get(), (size_t)size.line} | transform(hash_line);
329 for_each_diff(hashes.get(), (int)size.line,
330 new_hashes.begin(), (int)size.line,
331 [&changes](DiffOp op, int len) mutable {
332 switch (op)
333 {
334 case DiffOp::Keep:
335 changes.push_back({len, 0, 0});
336 break;
337 case DiffOp::Add:
338 changes.back().add += len;
339 break;
340 case DiffOp::Remove:
341 changes.back().del += len;
342 break;
343 }
344 });
345 std::copy(new_hashes.begin(), new_hashes.end(), hashes.get());
346
347 int line = 0;
348 for (auto& change : changes)
349 {
350 line += change.keep;
351 if (int del = change.del - change.add; del > 0)
352 {
353 format_with(writer, "\033[{}H\033[{}M", line + 1, del);
354 line -= del;
355 }
356 line += change.del;
357 }
358
359 line = 0;
360 for (auto& change : changes)
361 {
362 line += change.keep;
363 for (int i = 0; i < change.add; ++i)
364 {
365 if (int add = change.add - change.del; i == 0 and add > 0)
366 format_with(writer, "\033[{}H\033[{}L", line + 1, add);
367 else
368 format_with(writer, "\033[{}H", line + 1);
369
370 output_line(lines[line++]);
371 }
372 }
373
374 writer.write("\033[?2026l"); // end synchronized update
375 }
376 else
377 {
378 for (int line = 0; line < (int)size.line; ++line)
379 {
380 auto hash = hash_line(lines[line]);
381 if (hash == hashes[line])
382 continue;
383 hashes[line] = hash;
384
385 format_with(writer, "\033[{}H", line + 1);
386 output_line(lines[line]);
387 }
388 }
389 }
390
391 constexpr int TerminalUI::default_shift_function_key;
392
393 static constexpr StringView assistant_cat[] =
394 { R"( ___ )",
395 R"( (__ \ )",
396 R"( / / ╭)",
397 R"( .' '·. │)",
398 R"( ' ” │)",
399 R"( ╰ /\_/| │)",
400 R"( | . \ │)",
401 R"( ╰_J` | | | ╯)",
402 R"( ' \__- _/ )",
403 R"( \_\ \_\ )",
404 R"( )"};
405
406 static constexpr StringView assistant_clippy[] =
407 { " ╭──╮ ",
408 " │ │ ",
409 " @ @ ╭",
410 " ││ ││ │",
411 " ││ ││ ╯",
412 " │╰─╯│ ",
413 " ╰───╯ ",
414 " " };
415
416 static constexpr StringView assistant_dilbert[] =
417 { R"( დოოოოოდ )",
418 R"( | | )",
419 R"( | | ╭)",
420 R"( |-ᱛ ᱛ-| │)",
421 R"( Ͼ ∪ Ͽ │)",
422 R"( | | ╯)",
423 R"( ˏ`-.ŏ.-´ˎ )",
424 R"( @ )",
425 R"( @ )",
426 R"( )"};
427
sq(T x)428 template<typename T> T sq(T x) { return x * x; }
429
430 static sig_atomic_t resize_pending = 0;
431 static sig_atomic_t stdin_closed = 0;
432
433 template<sig_atomic_t* signal_flag>
signal_handler(int)434 static void signal_handler(int)
435 {
436 *signal_flag = 1;
437 EventManager::instance().force_signal(0);
438 }
439
TerminalUI()440 TerminalUI::TerminalUI()
441 : m_cursor{CursorMode::Buffer, {}},
442 m_stdin_watcher{STDIN_FILENO, FdEvents::Read, EventMode::Urgent,
__anonc48239490802() 443 [this](FDWatcher&, FdEvents, EventMode) {
444 if (not m_on_key)
445 return;
446
447 while (auto key = get_next_key())
448 {
449 if (key == ctrl('z'))
450 kill(0, SIGTSTP); // We suspend at this line
451 else
452 m_on_key(*key);
453 }
454 }},
455 m_assistant(assistant_clippy)
456 {
457 if (not isatty(1))
458 throw runtime_error("stdout is not a tty");
459
460 tcgetattr(STDIN_FILENO, &m_original_termios);
461
462 setup_terminal();
463 set_raw_mode();
464 enable_mouse(true);
465
466 set_signal_handler(SIGWINCH, &signal_handler<&resize_pending>);
467 set_signal_handler(SIGHUP, &signal_handler<&stdin_closed>);
__anonc48239490902(int)468 set_signal_handler(SIGTSTP, [](int){ TerminalUI::instance().suspend(); });
469
470 check_resize(true);
471 redraw(false);
472 }
473
~TerminalUI()474 TerminalUI::~TerminalUI()
475 {
476 enable_mouse(false);
477 restore_terminal();
478 tcsetattr(STDIN_FILENO, TCSAFLUSH, &m_original_termios);
479 set_signal_handler(SIGWINCH, SIG_DFL);
480 set_signal_handler(SIGHUP, SIG_DFL);
481 set_signal_handler(SIGTSTP, SIG_DFL);
482 }
483
suspend()484 void TerminalUI::suspend()
485 {
486 bool mouse_enabled = m_mouse_enabled;
487 enable_mouse(false);
488 tcsetattr(STDIN_FILENO, TCSAFLUSH, &m_original_termios);
489 restore_terminal();
490
491 auto current = set_signal_handler(SIGTSTP, SIG_DFL);
492 sigset_t unblock_sigtstp, old_mask;
493 sigemptyset(&unblock_sigtstp);
494 sigaddset(&unblock_sigtstp, SIGTSTP);
495 sigprocmask(SIG_UNBLOCK, &unblock_sigtstp, &old_mask);
496
497 raise(SIGTSTP); // suspend here
498
499 set_signal_handler(SIGTSTP, current);
500 sigprocmask(SIG_SETMASK, &old_mask, nullptr);
501
502 setup_terminal();
503 check_resize(true);
504 set_raw_mode();
505 enable_mouse(mouse_enabled);
506
507 refresh(true);
508 }
509
set_raw_mode() const510 void TerminalUI::set_raw_mode() const
511 {
512 termios attr = m_original_termios;
513 attr.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
514 attr.c_oflag &= ~OPOST;
515 attr.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
516 attr.c_lflag |= NOFLSH;
517 attr.c_cflag &= ~(CSIZE | PARENB);
518 attr.c_cflag |= CS8;
519 attr.c_cc[VMIN] = attr.c_cc[VTIME] = 0;
520
521 tcsetattr(STDIN_FILENO, TCSANOW, &attr);
522 }
523
redraw(bool force)524 void TerminalUI::redraw(bool force)
525 {
526 m_window.blit(m_screen);
527
528 if (m_menu.columns != 0 or m_menu.pos.column > m_status_len)
529 m_menu.blit(m_screen);
530
531 m_info.blit(m_screen);
532
533 Writer writer{STDOUT_FILENO};
534 m_screen.output(force, (bool)m_synchronized, writer);
535
536 auto set_cursor_pos = [&](DisplayCoord c) {
537 format_with(writer, "\033[{};{}H", (int)c.line + 1, (int)c.column + 1);
538 };
539 if (m_cursor.mode == CursorMode::Prompt)
540 set_cursor_pos({m_status_on_top ? 0 : m_dimensions.line, m_cursor.coord.column});
541 else
542 set_cursor_pos(m_cursor.coord + content_line_offset());
543 }
544
set_cursor(CursorMode mode,DisplayCoord coord)545 void TerminalUI::set_cursor(CursorMode mode, DisplayCoord coord)
546 {
547 m_cursor = Cursor{mode, coord};
548 }
549
refresh(bool force)550 void TerminalUI::refresh(bool force)
551 {
552 if (m_dirty or force)
553 redraw(force);
554 m_dirty = false;
555 }
556
557 static const DisplayLine empty_line = { String(" "), {} };
558
draw(const DisplayBuffer & display_buffer,const Face & default_face,const Face & padding_face)559 void TerminalUI::draw(const DisplayBuffer& display_buffer,
560 const Face& default_face,
561 const Face& padding_face)
562 {
563 check_resize();
564
565 const DisplayCoord dim = dimensions();
566 const LineCount line_offset = content_line_offset();
567 LineCount line_index = line_offset;
568 for (const DisplayLine& line : display_buffer.lines())
569 m_window.draw(line_index++, line.atoms(), default_face);
570
571 auto face = merge_faces(default_face, padding_face);
572
573 DisplayAtom padding{String{m_padding_char, m_padding_fill ? dim.column : 1}};
574
575 while (line_index < dim.line + line_offset)
576 m_window.draw(line_index++, padding, face);
577
578 m_dirty = true;
579 }
580
draw_status(const DisplayLine & status_line,const DisplayLine & mode_line,const Face & default_face)581 void TerminalUI::draw_status(const DisplayLine& status_line,
582 const DisplayLine& mode_line,
583 const Face& default_face)
584 {
585 const LineCount status_line_pos = m_status_on_top ? 0 : m_dimensions.line;
586 m_window.draw(status_line_pos, status_line.atoms(), default_face);
587
588 const auto mode_len = mode_line.length();
589 m_status_len = status_line.length();
590 const auto remaining = m_dimensions.column - m_status_len;
591 if (mode_len < remaining)
592 {
593 ColumnCount col = m_dimensions.column - mode_len;
594 m_window.draw({status_line_pos, col}, mode_line.atoms(), default_face);
595 }
596 else if (remaining > 2)
597 {
598 DisplayLine trimmed_mode_line = mode_line;
599 trimmed_mode_line.trim(mode_len + 2 - remaining, remaining - 2);
600 trimmed_mode_line.insert(trimmed_mode_line.begin(), { "…", {} });
601 kak_assert(trimmed_mode_line.length() == remaining - 1);
602
603 ColumnCount col = m_dimensions.column - remaining + 1;
604 m_window.draw({status_line_pos, col}, trimmed_mode_line.atoms(), default_face);
605 }
606
607 if (m_set_title)
608 {
609 Writer writer{STDOUT_FILENO};
610 constexpr char suffix[] = " - Kakoune\007";
611 writer.write("\033]2;");
612 // Fill title escape sequence buffer, removing non ascii characters
613 for (auto& atom : mode_line)
614 {
615 const auto str = atom.content();
616 for (auto it = str.begin(), end = str.end(); it != end; utf8::to_next(it, end))
617 writer.write((*it >= 0x20 and *it <= 0x7e) ? *it : '?');
618 }
619 writer.write(suffix);
620 }
621
622 m_dirty = true;
623 }
624
check_resize(bool force)625 void TerminalUI::check_resize(bool force)
626 {
627 if (not force and not resize_pending)
628 return;
629
630 resize_pending = 0;
631
632 const int fd = open("/dev/tty", O_RDWR);
633 if (fd < 0)
634 return;
635 auto close_fd = on_scope_end([fd]{ ::close(fd); });
636
637 DisplayCoord terminal_size{24_line, 80_col};
638 if (winsize ws; ioctl(fd, TIOCGWINSZ, &ws) == 0 and ws.ws_row > 0 and ws.ws_col > 0)
639 terminal_size = {ws.ws_row, ws.ws_col};
640
641 const bool info = (bool)m_info;
642 const bool menu = (bool)m_menu;
643 if (m_window) m_window.destroy();
644 if (info) m_info.destroy();
645 if (menu) m_menu.destroy();
646
647 m_window.create({0, 0}, terminal_size);
648 m_screen.create({0, 0}, terminal_size);
649 m_screen.hashes.reset(new size_t[(int)terminal_size.line]{});
650 kak_assert(m_window);
651
652 m_dimensions = terminal_size - 1_line;
653
654 // if (char* csr = tigetstr((char*)"csr"))
655 // putp(tparm(csr, 0, ws.ws_row));
656
657 if (menu)
658 menu_show(Vector<DisplayLine>(std::move(m_menu.items)),
659 m_menu.anchor, m_menu.fg, m_menu.bg, m_menu.style);
660 if (info)
661 info_show(m_info.title, m_info.content, m_info.anchor, m_info.face, m_info.style);
662
663 set_resize_pending();
664 }
665
get_next_key()666 Optional<Key> TerminalUI::get_next_key()
667 {
668 if (stdin_closed)
669 {
670 set_signal_handler(SIGWINCH, SIG_DFL);
671 set_signal_handler(SIGHUP, SIG_DFL);
672 if (m_window)
673 m_window.destroy();
674 m_stdin_watcher.disable();
675 return {};
676 }
677
678 check_resize();
679
680 if (m_resize_pending)
681 {
682 m_resize_pending = false;
683 return resize(dimensions());
684 }
685
686 static auto get_char = []() -> Optional<unsigned char> {
687 if (not fd_readable(STDIN_FILENO))
688 return {};
689
690 if (unsigned char c = 0; read(STDIN_FILENO, &c, 1) == 1)
691 return c;
692
693 stdin_closed = 1;
694 return {};
695 };
696
697 const auto c = get_char();
698 if (not c)
699 return {};
700
701 static constexpr auto control = [](char c) { return c & 037; };
702
703 auto convert = [this](Codepoint c) -> Codepoint {
704 if (c == control('m') or c == control('j'))
705 return Key::Return;
706 if (c == control('i'))
707 return Key::Tab;
708 if (c == m_original_termios.c_cc[VERASE])
709 return Key::Backspace;
710 if (c == 127) // when it's not backspace
711 return Key::Delete;
712 if (c == 27)
713 return Key::Escape;
714 return c;
715 };
716 auto parse_key = [&convert](unsigned char c) -> Key {
717 if (Codepoint cp = convert(c); cp > 255)
718 return Key{cp};
719 // Special case: you can type NUL with Ctrl-2 or Ctrl-Shift-2 or
720 // Ctrl-Backtick, but the most straightforward way is Ctrl-Space.
721 if (c == 0)
722 return ctrl(' ');
723 // Represent Ctrl-letter combinations in lower-case, to be clear
724 // that Shift is not involved.
725 if (c < 27)
726 return ctrl(c - 1 + 'a');
727 // Represent Ctrl-symbol combinations in "upper-case", as they are
728 // traditionally-rendered.
729 // Note that Escape is handled elsewhere.
730 if (c < 32)
731 return ctrl(c - 1 + 'A');
732
733 struct Sentinel{};
734 struct CharIterator
735 {
736 unsigned char operator*() { if (not c) c = get_char().value_or((unsigned char)0); return *c; }
737 CharIterator& operator++() { c.reset(); return *this; }
738 bool operator==(const Sentinel&) const { return false; }
739 Optional<unsigned char> c;
740 };
741 return Key{utf8::codepoint(CharIterator{c}, Sentinel{})};
742 };
743
744 auto parse_mask = [](int mask) {
745 Key::Modifiers mod = Key::Modifiers::None;
746 if (mask & 1)
747 mod |= Key::Modifiers::Shift;
748 if (mask & 2)
749 mod |= Key::Modifiers::Alt;
750 if (mask & 4)
751 mod |= Key::Modifiers::Control;
752 return mod;
753 };
754
755 auto parse_csi = [this, &convert, &parse_mask]() -> Optional<Key> {
756 auto next_char = [] { return get_char().value_or((unsigned char)0xff); };
757 int params[16][4] = {};
758 auto c = next_char();
759 char private_mode = 0;
760 if (c == '?' or c == '<' or c == '=' or c == '>')
761 {
762 private_mode = c;
763 c = next_char();
764 }
765 for (int count = 0, subcount = 0; count < 16 and c >= 0x30 && c <= 0x3f; c = next_char())
766 {
767 if (isdigit(c))
768 params[count][subcount] = params[count][subcount] * 10 + c - '0';
769 else if (c == ':' && subcount < 3)
770 ++subcount;
771 else if (c == ';')
772 {
773 ++count;
774 subcount = 0;
775 }
776 else
777 return {};
778 }
779 if (c != '$' and (c < 0x40 or c > 0x7e))
780 return {};
781
782 auto mouse_button = [this](Key::Modifiers mod, Key::MouseButton button, Codepoint coord, bool release) {
783 auto mask = 1 << (int)button;
784 if (not release)
785 {
786 mod |= (m_mouse_state & mask) ? Key::Modifiers::MousePos : Key::Modifiers::MousePress;
787 m_mouse_state |= mask;
788 }
789 else
790 {
791 mod |= Key::Modifiers::MouseRelease;
792 m_mouse_state &= ~mask;
793 }
794 return Key{mod | Key::to_modifier(button), coord};
795 };
796
797 auto mouse_scroll = [this](Key::Modifiers mod, bool down) -> Key {
798 return {mod | Key::Modifiers::Scroll,
799 (Codepoint)((down ? 1 : -1) * m_wheel_scroll_amount)};
800 };
801
802 auto masked_key = [&](Codepoint key, Codepoint shifted_key = 0) {
803 int mask = std::max(params[1][0] - 1, 0);
804 Key::Modifiers modifiers = parse_mask(mask);
805 if (shifted_key != 0 and (modifiers & Key::Modifiers::Shift))
806 {
807 modifiers &= ~Key::Modifiers::Shift;
808 key = shifted_key;
809 }
810 return Key{modifiers, key};
811 };
812
813 switch (c)
814 {
815 case '$':
816 if (private_mode == '?' and next_char() == 'y') // DECRPM
817 {
818 if (params[0][0] == 2026)
819 m_synchronized.supported = (params[1][0] == 1 or params[1][0] == 2);
820 return {Key::Invalid};
821 }
822 switch (params[0][0])
823 {
824 case 23: case 24:
825 return Key{Key::Modifiers::Shift, Key::F11 + params[0][0] - 23}; // rxvt style
826 }
827 return {};
828 case 'A': return masked_key(Key::Up);
829 case 'B': return masked_key(Key::Down);
830 case 'C': return masked_key(Key::Right);
831 case 'D': return masked_key(Key::Left);
832 case 'E': return masked_key('5'); // Numeric keypad 5
833 case 'F': return masked_key(Key::End); // PC/xterm style
834 case 'H': return masked_key(Key::Home); // PC/xterm style
835 case 'P': return masked_key(Key::F1);
836 case 'Q': return masked_key(Key::F2);
837 case 'R': return masked_key(Key::F3);
838 case 'S': return masked_key(Key::F4);
839 case '~':
840 switch (params[0][0])
841 {
842 case 1: return masked_key(Key::Home); // VT220/tmux style
843 case 2: return masked_key(Key::Insert);
844 case 3: return masked_key(Key::Delete);
845 case 4: return masked_key(Key::End); // VT220/tmux style
846 case 5: return masked_key(Key::PageUp);
847 case 6: return masked_key(Key::PageDown);
848 case 7: return masked_key(Key::Home); // rxvt style
849 case 8: return masked_key(Key::End); // rxvt style
850 case 11: case 12: case 13: case 14: case 15:
851 return masked_key(Key::F1 + params[0][0] - 11);
852 case 17: case 18: case 19: case 20: case 21:
853 return masked_key(Key::F6 + params[0][0] - 17);
854 case 23: case 24:
855 return masked_key(Key::F11 + params[0][0] - 23);
856 case 25: case 26:
857 return Key{Key::Modifiers::Shift, Key::F3 + params[0][0] - 25}; // rxvt style
858 case 28: case 29:
859 return Key{Key::Modifiers::Shift, Key::F5 + params[0][0] - 28}; // rxvt style
860 case 31: case 32:
861 return Key{Key::Modifiers::Shift, Key::F7 + params[0][0] - 31}; // rxvt style
862 case 33: case 34:
863 return Key{Key::Modifiers::Shift, Key::F9 + params[0][0] - 33}; // rxvt style
864 }
865 return {};
866 case 'u':
867 return masked_key(convert(static_cast<Codepoint>(params[0][0])),
868 convert(static_cast<Codepoint>(params[0][1])));
869 case 'Z': return shift(Key::Tab);
870 case 'I': return {Key::FocusIn};
871 case 'O': return {Key::FocusOut};
872 case 'M': case 'm':
873 const bool sgr = private_mode == '<';
874 if (not sgr and c != 'M')
875 return {};
876
877 const Codepoint b = sgr ? params[0][0] : next_char() - 32;
878 const int x = (sgr ? params[1][0] : next_char() - 32) - 1;
879 const int y = (sgr ? params[2][0] : next_char() - 32) - 1;
880 auto coord = encode_coord({y - content_line_offset(), x});
881 Key::Modifiers mod = parse_mask((b >> 2) & 0x7);
882 switch (const int code = b & 0x43; code)
883 {
884 case 0: case 1: case 2:
885 return mouse_button(mod, Key::MouseButton{code}, coord, c == 'm');
886 case 3:
887 if (sgr)
888 return {};
889 else if (int guess = ffs(m_mouse_state) - 1; 0 <= guess and guess < 3)
890 return mouse_button(mod, Key::MouseButton{guess}, coord, true);
891 break;
892 case 64: return mouse_scroll(mod, false);
893 case 65: return mouse_scroll(mod, true);
894 }
895 return Key{Key::Modifiers::MousePos, coord};
896 }
897 return {};
898 };
899
900 auto parse_ss3 = [&parse_mask]() -> Optional<Key> {
901 int raw_mask = 0;
902 char code = '0';
903 do {
904 raw_mask = raw_mask * 10 + (code - '0');
905 code = get_char().value_or((unsigned char)0xff);
906 } while (code >= '0' and code <= '9');
907 Key::Modifiers mod = parse_mask(std::max(raw_mask - 1, 0));
908
909 switch (code)
910 {
911 case ' ': return Key{mod, ' '};
912 case 'A': return Key{mod, Key::Up};
913 case 'B': return Key{mod, Key::Down};
914 case 'C': return Key{mod, Key::Right};
915 case 'D': return Key{mod, Key::Left};
916 case 'F': return Key{mod, Key::End};
917 case 'H': return Key{mod, Key::Home};
918 case 'I': return Key{mod, Key::Tab};
919 case 'M': return Key{mod, Key::Return};
920 case 'P': return Key{mod, Key::F1};
921 case 'Q': return Key{mod, Key::F2};
922 case 'R': return Key{mod, Key::F3};
923 case 'S': return Key{mod, Key::F4};
924 case 'X': return Key{mod, '='};
925 case 'j': return Key{mod, '*'};
926 case 'k': return Key{mod, '+'};
927 case 'l': return Key{mod, ','};
928 case 'm': return Key{mod, '-'};
929 case 'n': return Key{mod, '.'};
930 case 'o': return Key{mod, '/'};
931 case 'p': return Key{mod, '0'};
932 case 'q': return Key{mod, '1'};
933 case 'r': return Key{mod, '2'};
934 case 's': return Key{mod, '3'};
935 case 't': return Key{mod, '4'};
936 case 'u': return Key{mod, '5'};
937 case 'v': return Key{mod, '6'};
938 case 'w': return Key{mod, '7'};
939 case 'x': return Key{mod, '8'};
940 case 'y': return Key{mod, '9'};
941 default: return {};
942 }
943 };
944
945 if (*c != 27)
946 return parse_key(*c);
947
948 if (auto next = get_char())
949 {
950 if (*next == '[') // potential CSI
951 return parse_csi().value_or(alt('['));
952 if (*next == 'O') // potential SS3
953 return parse_ss3().value_or(alt('O'));
954 return alt(parse_key(*next));
955 }
956 return Key{Key::Escape};
957 }
958
959 template<typename T>
div_round_up(T a,T b)960 T div_round_up(T a, T b)
961 {
962 return (a - T(1)) / b + T(1);
963 }
964
draw_menu()965 void TerminalUI::draw_menu()
966 {
967 // menu show may have not created the window if it did not fit.
968 // so be tolerant.
969 if (not m_menu)
970 return;
971
972 const int item_count = (int)m_menu.items.size();
973 if (m_menu.columns == 0)
974 {
975 const auto win_width = m_menu.size.column - 4;
976 kak_assert(m_menu.size.line == 1);
977 ColumnCount pos = 0;
978
979 m_menu.draw({0, 0}, DisplayAtom(m_menu.first_item > 0 ? "< " : ""), m_menu.bg);
980
981 int i = m_menu.first_item;
982 for (; i < item_count and pos < win_width; ++i)
983 {
984 const DisplayLine& item = m_menu.items[i];
985 const ColumnCount item_width = item.length();
986 auto& face = i == m_menu.selected_item ? m_menu.fg : m_menu.bg;
987 m_menu.draw({0, pos+2}, item.atoms(), face);
988 if (pos + item_width >= win_width)
989 m_menu.draw({0, win_width+2}, DisplayAtom("…"), m_menu.bg);
990 pos += item_width + 1;
991 }
992
993 if (i != item_count)
994 m_menu.draw({0, win_width+3}, DisplayAtom(">"), m_menu.bg);
995
996 m_dirty = true;
997 return;
998 }
999
1000 const LineCount menu_lines = div_round_up(item_count, m_menu.columns);
1001 const LineCount win_height = m_menu.size.line;
1002 kak_assert(win_height <= menu_lines);
1003
1004 const ColumnCount column_width = (m_menu.size.column - 1) / m_menu.columns;
1005
1006 const LineCount mark_height = min(div_round_up(sq(win_height), menu_lines),
1007 win_height);
1008
1009 const int menu_cols = div_round_up(item_count, (int)m_menu.size.line);
1010 const int first_col = m_menu.first_item / (int)m_menu.size.line;
1011
1012 const LineCount mark_line = (win_height - mark_height) * first_col / max(1, menu_cols - m_menu.columns);
1013
1014 for (auto line = 0_line; line < win_height; ++line)
1015 {
1016 for (int col = 0; col < m_menu.columns; ++col)
1017 {
1018 int item_idx = (first_col + col) * (int)m_menu.size.line + (int)line;
1019 auto& face = item_idx < item_count and item_idx == m_menu.selected_item ? m_menu.fg : m_menu.bg;
1020 auto atoms = item_idx < item_count ? m_menu.items[item_idx].atoms() : ConstArrayView<DisplayAtom>{};
1021 m_menu.draw({line, col * column_width}, atoms, face);
1022 }
1023 const bool is_mark = line >= mark_line and line < mark_line + mark_height;
1024 m_menu.draw({line, m_menu.size.column - 1}, DisplayAtom(is_mark ? "█" : "░"), m_menu.bg);
1025 }
1026 m_dirty = true;
1027 }
1028
height_limit(MenuStyle style)1029 static LineCount height_limit(MenuStyle style)
1030 {
1031 switch (style)
1032 {
1033 case MenuStyle::Inline: return 10_line;
1034 case MenuStyle::Prompt: return 10_line;
1035 case MenuStyle::Search: return 3_line;
1036 }
1037 kak_assert(false);
1038 return 0_line;
1039 }
1040
menu_show(ConstArrayView<DisplayLine> items,DisplayCoord anchor,Face fg,Face bg,MenuStyle style)1041 void TerminalUI::menu_show(ConstArrayView<DisplayLine> items,
1042 DisplayCoord anchor, Face fg, Face bg,
1043 MenuStyle style)
1044 {
1045 if (m_menu)
1046 {
1047 m_menu.destroy();
1048 m_dirty = true;
1049 }
1050
1051 m_menu.fg = fg;
1052 m_menu.bg = bg;
1053 m_menu.style = style;
1054 m_menu.anchor = anchor;
1055
1056 if (m_dimensions.column <= 2)
1057 return;
1058
1059 const int item_count = items.size();
1060 m_menu.items.clear(); // make sure it is empty
1061 m_menu.items.reserve(item_count);
1062 const auto longest = accumulate(items | transform(&DisplayLine::length),
1063 1_col, [](auto&& lhs, auto&& rhs) { return std::max(lhs, rhs); });
1064
1065 const ColumnCount max_width = m_dimensions.column - 1;
1066 const bool is_inline = style == MenuStyle::Inline;
1067 const bool is_search = style == MenuStyle::Search;
1068 m_menu.columns = is_search ? 0 : (is_inline ? 1 : max((int)(max_width / (longest+1)), 1));
1069
1070 const LineCount max_height = min(height_limit(style), max(anchor.line, m_dimensions.line - anchor.line - 1));
1071 const LineCount height = is_search ?
1072 1 : (min<LineCount>(max_height, div_round_up(item_count, m_menu.columns)));
1073
1074 const ColumnCount maxlen = (m_menu.columns > 1 and item_count > 1) ?
1075 max_width / m_menu.columns - 1 : max_width;
1076
1077 for (auto& item : items)
1078 {
1079 m_menu.items.push_back(item);
1080 m_menu.items.back().trim(0, maxlen);
1081 kak_assert(m_menu.items.back().length() <= maxlen);
1082 }
1083
1084 if (is_inline)
1085 anchor.line += content_line_offset();
1086
1087 LineCount line = anchor.line + 1;
1088 ColumnCount column = std::max(0_col, std::min(anchor.column, m_dimensions.column - longest - 1));
1089 if (is_search)
1090 {
1091 line = m_status_on_top ? 0_line : m_dimensions.line;
1092 column = m_dimensions.column / 2;
1093 }
1094 else if (not is_inline)
1095 line = m_status_on_top ? 1_line : m_dimensions.line - height;
1096 else if (line + height > m_dimensions.line and anchor.line >= height)
1097 line = anchor.line - height;
1098
1099 const auto width = is_search ? m_dimensions.column - m_dimensions.column / 2
1100 : (is_inline ? min(longest+1, m_dimensions.column)
1101 : m_dimensions.column);
1102 m_menu.create({line, column}, {height, width});
1103 m_menu.selected_item = item_count;
1104 m_menu.first_item = 0;
1105
1106 draw_menu();
1107
1108 if (m_info)
1109 info_show(m_info.title, m_info.content,
1110 m_info.anchor, m_info.face, m_info.style);
1111 }
1112
menu_select(int selected)1113 void TerminalUI::menu_select(int selected)
1114 {
1115 const int item_count = m_menu.items.size();
1116 if (selected < 0 or selected >= item_count)
1117 {
1118 m_menu.selected_item = -1;
1119 m_menu.first_item = 0;
1120 }
1121 else if (m_menu.columns == 0) // Do not columnize
1122 {
1123 m_menu.selected_item = selected;
1124 const ColumnCount width = m_menu.size.column - 3;
1125 int first = 0;
1126 ColumnCount item_col = 0;
1127 for (int i = 0; i <= selected; ++i)
1128 {
1129 const ColumnCount item_width = m_menu.items[i].length() + 1;
1130 if (item_col + item_width > width)
1131 {
1132 first = i;
1133 item_col = item_width;
1134 }
1135 else
1136 item_col += item_width;
1137 }
1138 m_menu.first_item = first;
1139 }
1140 else
1141 {
1142 m_menu.selected_item = selected;
1143 const int menu_cols = div_round_up(item_count, (int)m_menu.size.line);
1144 const int first_col = m_menu.first_item / (int)m_menu.size.line;
1145 const int selected_col = m_menu.selected_item / (int)m_menu.size.line;
1146 if (selected_col < first_col)
1147 m_menu.first_item = selected_col * (int)m_menu.size.line;
1148 if (selected_col >= first_col + m_menu.columns)
1149 m_menu.first_item = min(selected_col, menu_cols - m_menu.columns) * (int)m_menu.size.line;
1150 }
1151 draw_menu();
1152 }
1153
menu_hide()1154 void TerminalUI::menu_hide()
1155 {
1156 if (not m_menu)
1157 return;
1158
1159 m_menu.items.clear();
1160 m_menu.destroy();
1161 m_dirty = true;
1162
1163 // Recompute info as it does not have to avoid the menu anymore
1164 if (m_info)
1165 info_show(m_info.title, m_info.content, m_info.anchor, m_info.face, m_info.style);
1166 }
1167
compute_pos(DisplayCoord anchor,DisplayCoord size,TerminalUI::Rect rect,TerminalUI::Rect to_avoid,bool prefer_above)1168 static DisplayCoord compute_pos(DisplayCoord anchor, DisplayCoord size,
1169 TerminalUI::Rect rect, TerminalUI::Rect to_avoid,
1170 bool prefer_above)
1171 {
1172 DisplayCoord pos;
1173 if (prefer_above)
1174 {
1175 pos = anchor - DisplayCoord{size.line};
1176 if (pos.line < 0)
1177 prefer_above = false;
1178 }
1179 auto rect_end = rect.pos + rect.size;
1180 if (not prefer_above)
1181 {
1182 pos = anchor + DisplayCoord{1_line};
1183 if (pos.line + size.line >= rect_end.line)
1184 pos.line = max(rect.pos.line, anchor.line - size.line);
1185 }
1186 if (pos.column + size.column >= rect_end.column)
1187 pos.column = max(rect.pos.column, rect_end.column - size.column);
1188
1189 if (to_avoid.size != DisplayCoord{})
1190 {
1191 DisplayCoord to_avoid_end = to_avoid.pos + to_avoid.size;
1192
1193 DisplayCoord end = pos + size;
1194
1195 // check intersection
1196 if (not (end.line < to_avoid.pos.line or end.column < to_avoid.pos.column or
1197 pos.line > to_avoid_end.line or pos.column > to_avoid_end.column))
1198 {
1199 pos.line = min(to_avoid.pos.line, anchor.line) - size.line;
1200 // if above does not work, try below
1201 if (pos.line < 0)
1202 pos.line = max(to_avoid_end.line, anchor.line);
1203 }
1204 }
1205
1206 return pos;
1207 }
1208
wrap_lines(const DisplayLineList & lines,ColumnCount max_width)1209 static DisplayLineList wrap_lines(const DisplayLineList& lines, ColumnCount max_width)
1210 {
1211 DisplayLineList result;
1212 for (auto line : lines)
1213 {
1214 ColumnCount column = 0;
1215 for (auto it = line.begin(); it != line.end(); )
1216 {
1217 auto length = it->length();
1218 column += length;
1219 if (column > max_width)
1220 {
1221 auto content = it->content().substr(0, length - (column - max_width));
1222 auto pos = find_if(content | reverse(), [](char c) { return not is_word(c); });
1223 if (pos != content.rend())
1224 content = {content.begin(), pos.base()};
1225
1226 if (not content.empty())
1227 it = ++line.split(it, content.column_length());
1228 result.push_back(AtomList(std::make_move_iterator(line.begin()),
1229 std::make_move_iterator(it)));
1230 it = line.erase(line.begin(), it);
1231 column = 0;
1232 }
1233 else
1234 ++it;
1235 }
1236 result.push_back(std::move(line));
1237 }
1238 return result;
1239 }
1240
info_show(const DisplayLine & title,const DisplayLineList & content,DisplayCoord anchor,Face face,InfoStyle style)1241 void TerminalUI::info_show(const DisplayLine& title, const DisplayLineList& content,
1242 DisplayCoord anchor, Face face, InfoStyle style)
1243 {
1244 info_hide();
1245
1246 m_info.title = title;
1247 m_info.content = content;
1248 m_info.anchor = anchor;
1249 m_info.face = face;
1250 m_info.style = style;
1251
1252 const bool framed = style == InfoStyle::Prompt or style == InfoStyle::Modal;
1253 const bool assisted = style == InfoStyle::Prompt and m_assistant.size() != 0;
1254
1255 DisplayCoord max_size = m_dimensions;
1256 if (style == InfoStyle::MenuDoc)
1257 max_size.column = std::max(m_dimensions.column - (m_menu.pos.column + m_menu.size.column),
1258 m_menu.pos.column);
1259 else if (style != InfoStyle::Modal)
1260 max_size.line -= m_menu.size.line;
1261
1262 const auto max_content_width = max_size.column - (framed ? 4 : 2) - (assisted ? m_assistant[0].column_length() : 0);
1263 if (max_content_width <= 0)
1264 return;
1265
1266 auto compute_size = [](const DisplayLineList& lines) -> DisplayCoord {
1267 return {(int)lines.size(), accumulate(lines, 0_col, [](ColumnCount c, const DisplayLine& l) { return std::max(c, l.length()); })};
1268 };
1269
1270 DisplayCoord content_size = compute_size(content);
1271 const bool wrap = content_size.column > max_content_width;
1272 DisplayLineList wrapped_content;
1273 if (wrap)
1274 {
1275 wrapped_content = wrap_lines(content, max_content_width);
1276 content_size = compute_size(wrapped_content);
1277 }
1278 const auto& lines = wrap ? wrapped_content : content;
1279
1280 DisplayCoord size{content_size.line, std::max(content_size.column, title.length() + (framed ? 2 : 0))};
1281 if (framed)
1282 size += {2, 4};
1283 if (assisted)
1284 size = {std::max(LineCount{(int)m_assistant.size()-1}, size.line), size.column + m_assistant[0].column_length()};
1285 size = {std::min(max_size.line, size.line), std::min(max_size.column, size.column)};
1286
1287 if ((framed and size.line < 3) or size.line <= 0)
1288 return;
1289
1290 const Rect rect = {content_line_offset(), m_dimensions};
1291 if (style == InfoStyle::Prompt)
1292 {
1293 anchor = DisplayCoord{m_status_on_top ? 0 : m_dimensions.line, m_dimensions.column-1};
1294 anchor = compute_pos(anchor, size, rect, m_menu, style == InfoStyle::InlineAbove);
1295 }
1296 else if (style == InfoStyle::Modal)
1297 {
1298 auto half = [](const DisplayCoord& c) { return DisplayCoord{c.line / 2, c.column / 2}; };
1299 anchor = rect.pos + half(rect.size) - half(size);
1300 }
1301 else if (style == InfoStyle::MenuDoc)
1302 {
1303 const auto right_max_width = m_dimensions.column - (m_menu.pos.column + m_menu.size.column);
1304 const auto left_max_width = m_menu.pos.column;
1305 anchor.line = m_menu.pos.line;
1306 if (size.column <= right_max_width or right_max_width >= left_max_width)
1307 anchor.column = m_menu.pos.column + m_menu.size.column;
1308 else
1309 anchor.column = m_menu.pos.column - size.column;
1310 }
1311 else
1312 {
1313 anchor = compute_pos(anchor, size, rect, m_menu, style == InfoStyle::InlineAbove);
1314 anchor.line += content_line_offset();
1315 }
1316
1317 m_info.create(anchor, size);
1318 for (auto line = 0_line; line < size.line; ++line)
1319 {
1320 auto draw_atoms = [&, this, pos=DisplayCoord{line}](auto&&... args) mutable {
1321 auto draw = overload(
1322 [&](ColumnCount padding) {
1323 pos.column += padding;
1324 },
1325 [&](String str) {
1326 auto len = str.column_length();
1327 m_info.draw(pos, DisplayAtom{std::move(str)}, face);
1328 pos.column += len;
1329 },
1330 [&](const DisplayLine& atoms) {
1331 m_info.draw(pos, atoms.atoms(), face);
1332 pos.column += atoms.length();
1333 });
1334 (draw(args), ...);
1335 };
1336
1337 constexpr Codepoint dash{L'─'};
1338 constexpr Codepoint dotted_dash{L'┄'};
1339 if (assisted)
1340 {
1341 const auto assistant_top_margin = (size.line - m_assistant.size()+1) / 2;
1342 StringView assistant_line = (line >= assistant_top_margin) ?
1343 m_assistant[(int)min(line - assistant_top_margin, LineCount{(int)m_assistant.size()}-1)]
1344 : m_assistant[(int)m_assistant.size()-1];
1345
1346 draw_atoms(assistant_line.str());
1347 }
1348 if (not framed)
1349 draw_atoms(lines[(int)line]);
1350 else if (line == 0)
1351 {
1352 if (title.atoms().empty() or content_size.column < 2)
1353 draw_atoms("╭─" + String{dash, content_size.column} + "─╮");
1354 else
1355 {
1356 auto trimmed_title = title;
1357 trimmed_title.trim(0, content_size.column - 2);
1358 auto dash_count = content_size.column - trimmed_title.length() - 2;
1359 String left{dash, dash_count / 2};
1360 String right{dash, dash_count - dash_count / 2};
1361 draw_atoms("╭─" + left + "┤", trimmed_title, "├" + right +"─╮");
1362 }
1363 }
1364 else if (line < size.line - 1 and line <= lines.size())
1365 {
1366 auto info_line = lines[(int)line - 1];
1367 const bool trimmed = info_line.trim(0, content_size.column);
1368 const ColumnCount padding = content_size.column - info_line.length();
1369 draw_atoms("│ ", info_line, padding, (trimmed ? "…│" : " │"));
1370 }
1371 else if (line == std::min<LineCount>((int)lines.size() + 1, size.line - 1))
1372 draw_atoms("╰─", String(line > lines.size() ? dash : dotted_dash, content_size.column), "─╯");
1373 }
1374 m_dirty = true;
1375 }
1376
info_hide()1377 void TerminalUI::info_hide()
1378 {
1379 if (not m_info)
1380 return;
1381 m_info.destroy();
1382 m_dirty = true;
1383 }
1384
set_on_key(OnKeyCallback callback)1385 void TerminalUI::set_on_key(OnKeyCallback callback)
1386 {
1387 m_on_key = std::move(callback);
1388 EventManager::instance().force_signal(0);
1389 }
1390
dimensions()1391 DisplayCoord TerminalUI::dimensions()
1392 {
1393 return m_dimensions;
1394 }
1395
content_line_offset() const1396 LineCount TerminalUI::content_line_offset() const
1397 {
1398 return m_status_on_top ? 1 : 0;
1399 }
1400
set_resize_pending()1401 void TerminalUI::set_resize_pending()
1402 {
1403 m_resize_pending = true;
1404 EventManager::instance().force_signal(0);
1405 }
1406
setup_terminal()1407 void TerminalUI::setup_terminal()
1408 {
1409 write(STDOUT_FILENO,
1410 "\033[?1049h" // enable alternative screen buffer
1411 "\033[?1004h" // enable focus notify
1412 "\033[>4;1m" // request CSI u style key reporting
1413 "\033[>5u" // kitty progressive enhancement - report shifted key codes
1414 "\033[22t" // save the current window title
1415 "\033[?25l" // hide cursor
1416 "\033=" // set application keypad mode, so the keypad keys send unique codes
1417 "\033[?2026$p" // query support for synchronize output
1418 );
1419 }
1420
restore_terminal()1421 void TerminalUI::restore_terminal()
1422 {
1423 write(STDOUT_FILENO,
1424 "\033>"
1425 "\033[?25h"
1426 "\033[23t"
1427 "\033[<u"
1428 "\033[>4;0m"
1429 "\033[?1004l"
1430 "\033[?1049l"
1431 "\033[m" // set the terminal output back to default colours and style
1432 );
1433 }
1434
enable_mouse(bool enabled)1435 void TerminalUI::enable_mouse(bool enabled)
1436 {
1437 if (enabled == m_mouse_enabled)
1438 return;
1439
1440 m_mouse_enabled = enabled;
1441 if (enabled)
1442 {
1443 write(STDOUT_FILENO,
1444 "\033[?1006h" // force SGR mode
1445 "\033[?1000h" // enable mouse
1446 "\033[?1002h" // force enable report mouse position
1447 );
1448 }
1449 else
1450 {
1451 write(STDOUT_FILENO,
1452 "\033[?1002l"
1453 "\033[?1000l"
1454 "\033[?1006l"
1455 );
1456 }
1457 }
1458
set_ui_options(const Options & options)1459 void TerminalUI::set_ui_options(const Options& options)
1460 {
1461 auto find = [&](StringView name) -> Optional<StringView> {
1462 if (auto it = options.find(name); it != options.end())
1463 return StringView{it->value};
1464 return {};
1465 };
1466
1467 auto assistant = find("terminal_assistant").value_or("clippy");
1468 if (assistant == "clippy")
1469 m_assistant = assistant_clippy;
1470 else if (assistant == "cat")
1471 m_assistant = assistant_cat;
1472 else if (assistant == "dilbert")
1473 m_assistant = assistant_dilbert;
1474 else if (assistant == "none" or assistant == "off")
1475 m_assistant = ConstArrayView<StringView>{};
1476
1477 auto to_bool = [](StringView s) { return s == "yes" or s == "true"; };
1478
1479 m_status_on_top = find("terminal_status_on_top").map(to_bool).value_or(false);
1480 m_set_title = find("terminal_set_title").map(to_bool).value_or(true);
1481
1482 auto synchronized = find("terminal_synchronized").map(to_bool);
1483 m_synchronized.set = (bool)synchronized;
1484 m_synchronized.requested = synchronized.value_or(false);
1485
1486 m_shift_function_key = find("terminal_shift_function_key").map(str_to_int_ifp).value_or(default_shift_function_key);
1487
1488 enable_mouse(find("terminal_enable_mouse").map(to_bool).value_or(true));
1489 m_wheel_scroll_amount = find("terminal_wheel_scroll_amount").map(str_to_int_ifp).value_or(3);
1490
1491 m_padding_char = find("terminal_padding_char").map([](StringView s) { return s.column_length() < 1 ? ' ' : s[0_char]; }).value_or(Codepoint{'~'});
1492 m_padding_fill = find("terminal_padding_fill").map(to_bool).value_or(false);
1493 }
1494
1495 }
1496