kakoune/src/terminal_ui.cc

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#include "terminal_ui.hh"
#include "display_buffer.hh"
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#include "event_manager.hh"
#include "exception.hh"
#include "file.hh"
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#include "keys.hh"
#include "ranges.hh"
#include "string_utils.hh"
#include "diff.hh"
#include <algorithm>
#include <fcntl.h>
#include <csignal>
#include <sys/ioctl.h>
#include <unistd.h>
#include <strings.h>
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constexpr char control(char c) { return c & 037; }
namespace Kakoune
{
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using std::min;
using std::max;
static void set_cursor_pos(DisplayCoord coord)
{
printf("\033[%d;%dH", (int)coord.line + 1, (int)coord.column + 1);
}
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void TerminalUI::Window::create(const DisplayCoord& p, const DisplayCoord& s)
{
pos = p;
size = s;
lines.resize((int)size.line);
}
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void TerminalUI::Window::destroy()
{
pos = DisplayCoord{};
size = DisplayCoord{};
lines.clear();
}
struct TerminalUI::Window::Line
{
struct Atom
{
String text;
Face face;
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friend bool operator==(const Atom& lhs, const Atom& rhs) { return lhs.text == rhs.text and lhs.face == rhs.face; }
friend bool operator!=(const Atom& lhs, const Atom& rhs) { return not (lhs == rhs); }
friend size_t hash_value(const Atom& atom) { return hash_values(atom.text, atom.face); }
};
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void append(String text, Face face)
{
if (not atoms.empty() and atoms.back().face == face)
atoms.back().text += text;
else
atoms.push_back({std::move(text), face});
}
void resize(ColumnCount width)
{
auto it = atoms.begin();
ColumnCount column = 0;
for (; it != atoms.end() and column < width; ++it)
column += it->text.column_length();
if (column < width)
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append(String{' ', width - column}, atoms.empty() ? Face{} : atoms.back().face);
else
{
atoms.erase(it, atoms.end());
if (column > width)
{
auto& text = atoms.back().text;
auto new_length = text.column_length() - (column - width);
text.resize(text.byte_count_to(new_length), 0);
}
}
}
Vector<Atom>::iterator erase_range(ColumnCount pos, ColumnCount len)
{
struct Pos{ Vector<Atom>::iterator it; ByteCount byte; };
auto find_col = [pos=0_col, it=atoms.begin(), end=atoms.end()](ColumnCount col) mutable {
for (; it != end; ++it)
{
auto atom_len = it->text.column_length();
if (pos + atom_len >= col)
return Pos{it, it->text.byte_count_to(col - pos)};
pos += atom_len;
}
return Pos{it, 0_byte};
};
Pos begin = find_col(pos);
Pos end = find_col(pos+len);
if (begin.it == end.it)
{
auto end_text = begin.it->text.substr(end.byte).str();
begin.it->text.resize(begin.byte, 0);
return end_text.empty() ? begin.it+1 : atoms.insert(begin.it+1, {std::move(end_text), begin.it->face});
}
begin.it->text.resize(begin.byte, 0);
if (end.byte > 0)
{
if (end.byte == end.it->text.length())
++end.it;
else
end.it->text = end.it->text.substr(end.byte).str();
}
return atoms.erase(begin.it+1, end.it);
}
Vector<Atom> atoms;
};
void TerminalUI::Window::blit(Window& target)
{
kak_assert(pos.line + lines.size() <= target.lines.size());
auto target_line = target.lines.begin() + (size_t)pos.line;
for (auto& line : lines)
{
line.resize(size.column);
target_line->resize(target.size.column);
target_line->atoms.insert(target_line->erase_range(pos.column, size.column),
line.atoms.begin(), line.atoms.end());
++target_line;
}
}
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void TerminalUI::Window::move_cursor(DisplayCoord coord)
{
cursor = {std::min(size.line-1, coord.line), std::min(size.column-1, coord.column)};
}
void TerminalUI::Window::draw(ConstArrayView<DisplayAtom> atoms,
const Face& default_face)
{
lines[(size_t)cursor.line].resize(cursor.column);
for (const DisplayAtom& atom : atoms)
{
StringView content = atom.content();
if (content.empty())
continue;
auto face = merge_faces(default_face, atom.face);
if (content.back() == '\n')
{
lines[(int)cursor.line].append(content.substr(0, content.length()-1).str(), face);
lines[(int)cursor.line].append(" ", face);
}
else
lines[(int)cursor.line].append(content.str(), face);
cursor.column += content.column_length();
}
if (cursor.column < size.column)
lines[(int)cursor.line].append(String(' ', size.column - cursor.column), default_face);
}
void TerminalUI::Screen::output(bool force)
{
if (lines.empty())
return;
static constexpr int fg_table[]{ 39, 30, 31, 32, 33, 34, 35, 36, 37, 90, 91, 92, 93, 94, 95, 96, 97 };
static constexpr int bg_table[]{ 49, 40, 41, 42, 43, 44, 45, 46, 47, 100, 101, 102, 103, 104, 105, 106, 107 };
static constexpr int attr_table[]{ 0, 4, 7, 5, 1, 2, 3 };
auto set_color = [](bool fg, const Color& color) {
if (color.isRGB())
printf(";%d;2;%d;%d;%d", fg ? 38 : 48, color.r, color.g, color.b);
else
printf(";%d", (fg ? fg_table : bg_table)[(int)(char)color.color]);
};
auto set_attributes = [](const Attribute& attributes) {
for (int i = 0; i < sizeof(attr_table) / sizeof(int); ++i)
{
if (attributes & (Attribute)(1 << i))
printf(";%d", attr_table[i]);
}
};
struct Change { int pos; int add; int del; };
Vector<Change> changes{Change{}};
auto new_hashes = lines | transform([](auto& line) { return hash_value(line.atoms); }) | gather<Vector>();
for_each_diff(hashes.begin(), hashes.size(),
new_hashes.begin(), new_hashes.size(),
[&, pos=0](DiffOp op, int len) mutable {
switch (op)
{
case DiffOp::Keep:
pos += len;
if (changes.back().add != 0 || changes.back().del != 0)
changes.push_back({pos, 0, 0});
break;
case DiffOp::Add:
if (changes.back().add == 0 && changes.back().del == 0)
changes.back().pos = pos;
changes.back().add += len;
pos += len;
break;
case DiffOp::Remove:
if (changes.back().add == 0 && changes.back().del == 0)
changes.back().pos = pos;
changes.back().del += len;
break;
}
});
hashes = std::move(new_hashes);
int offset = 0;
for (auto& change : changes)
{
if (change.del > change.add)
printf("\033[%dH\033[%dM", change.pos - offset + 1, change.del - change.add);
offset += change.add - change.del;
}
for (auto& change : changes)
{
for (int i = 0; i < change.add; ++i)
{
if (i == 0 and change.add > change.del)
printf("\033[%dH\033[%dL", change.pos + 1, change.add - change.del);
else
printf("\033[%dH", change.pos + i + 1);
for (auto& atom : lines[change.pos + i].atoms)
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{
fputs("\033[", stdout);
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set_attributes(atom.face.attributes);
set_color(true, atom.face.fg);
set_color(false, atom.face.bg);
fputs("m", stdout);
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fputs(atom.text.c_str(), stdout);
}
}
}
}
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constexpr int TerminalUI::default_shift_function_key;
static constexpr StringView assistant_cat[] =
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{ R"( ___ )",
R"( (__ \ )",
R"( / / ╭)",
R"( .' '·. │)",
R"( ' ” │)",
R"( ╰ /\_/| │)",
R"( | . \ │)",
R"( ╰_J` | | | ╯)",
R"( ' \__- _/ )",
R"( \_\ \_\ )",
R"( )"};
static constexpr StringView assistant_clippy[] =
{ " ╭──╮ ",
" │ │ ",
" @ @ ╭",
" ││ ││ │",
" ││ ││ ╯",
" │╰─╯│ ",
" ╰───╯ ",
" " };
static constexpr StringView assistant_dilbert[] =
{ R"( დოოოოოდ )",
R"( | | )",
R"( | | ╭)",
R"( |-ᱛ ᱛ-| │)",
R"( Ͼ Ͽ │)",
R"( | | ╯)",
R"( ˏ`-.ŏ.-´ˎ )",
R"( @ )",
R"( @ )",
R"( )"};
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template<typename T> T sq(T x) { return x * x; }
static sig_atomic_t resize_pending = 0;
static sig_atomic_t stdin_closed = 0;
template<sig_atomic_t* signal_flag>
static void signal_handler(int)
{
*signal_flag = 1;
EventManager::instance().force_signal(0);
}
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TerminalUI::TerminalUI()
: m_cursor{CursorMode::Buffer, {}},
m_stdin_watcher{STDIN_FILENO, FdEvents::Read, EventMode::Urgent,
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[this](FDWatcher&, FdEvents, EventMode) {
if (not m_on_key)
return;
while (auto key = get_next_key())
{
if (key == ctrl('z'))
kill(0, SIGTSTP); // We suspend at this line
else
m_on_key(*key);
}
}},
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m_assistant(assistant_clippy)
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{
if (not isatty(1))
throw runtime_error("stdout is not a tty");
tcgetattr(STDIN_FILENO, &m_original_termios);
setup_terminal();
set_raw_mode();
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enable_mouse(true);
set_signal_handler(SIGWINCH, &signal_handler<&resize_pending>);
set_signal_handler(SIGHUP, &signal_handler<&stdin_closed>);
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set_signal_handler(SIGTSTP, [](int){ TerminalUI::instance().suspend(); });
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check_resize(true);
redraw(false);
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}
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TerminalUI::~TerminalUI()
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{
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enable_mouse(false);
restore_terminal();
tcsetattr(STDIN_FILENO, TCSAFLUSH, &m_original_termios);
set_signal_handler(SIGWINCH, SIG_DFL);
set_signal_handler(SIGHUP, SIG_DFL);
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set_signal_handler(SIGTSTP, SIG_DFL);
}
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void TerminalUI::suspend()
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{
bool mouse_enabled = m_mouse_enabled;
enable_mouse(false);
restore_terminal();
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auto current = set_signal_handler(SIGTSTP, SIG_DFL);
sigset_t unblock_sigtstp, old_mask;
sigemptyset(&unblock_sigtstp);
sigaddset(&unblock_sigtstp, SIGTSTP);
sigprocmask(SIG_UNBLOCK, &unblock_sigtstp, &old_mask);
raise(SIGTSTP); // suspend here
tcsetattr(STDIN_FILENO, TCSAFLUSH, &m_original_termios);
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set_signal_handler(SIGTSTP, current);
sigprocmask(SIG_SETMASK, &old_mask, nullptr);
setup_terminal();
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check_resize(true);
set_raw_mode();
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enable_mouse(mouse_enabled);
refresh(true);
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}
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void TerminalUI::set_raw_mode() const
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{
termios attr = m_original_termios;
attr.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
attr.c_oflag &= ~OPOST;
attr.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
attr.c_lflag |= NOFLSH;
attr.c_cflag &= ~(CSIZE | PARENB);
attr.c_cflag |= CS8;
attr.c_cc[VMIN] = attr.c_cc[VTIME] = 0;
tcsetattr(STDIN_FILENO, TCSANOW, &attr);
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}
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void TerminalUI::redraw(bool force)
{
m_window.blit(m_screen);
if (m_menu.columns != 0 or m_menu.pos.column > m_status_len)
m_menu.blit(m_screen);
m_info.blit(m_screen);
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m_screen.output(force);
if (m_cursor.mode == CursorMode::Prompt)
set_cursor_pos({m_status_on_top ? 0 : m_dimensions.line, m_cursor.coord.column});
else
set_cursor_pos(m_cursor.coord + content_line_offset());
fflush(stdout);
}
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void TerminalUI::set_cursor(CursorMode mode, DisplayCoord coord)
{
m_cursor = Cursor{mode, coord};
}
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void TerminalUI::refresh(bool force)
{
if (m_dirty or force)
redraw(force);
m_dirty = false;
}
static const DisplayLine empty_line = { String(" "), {} };
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void TerminalUI::draw(const DisplayBuffer& display_buffer,
const Face& default_face,
const Face& padding_face)
{
check_resize();
const DisplayCoord dim = dimensions();
const LineCount line_offset = content_line_offset();
LineCount line_index = line_offset;
for (const DisplayLine& line : display_buffer.lines())
{
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m_window.move_cursor(line_index++);
m_window.draw(line.atoms(), default_face);
}
auto face = merge_faces(default_face, padding_face);
while (line_index < dim.line + line_offset)
{
m_window.move_cursor(line_index++);
m_window.draw(m_padding_char, face);
const auto padding_len = m_padding_char.length();
for (auto col = padding_len; m_padding_fill and col < dim.column; col += padding_len)
m_window.draw(m_padding_char, face);
}
m_dirty = true;
}
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void TerminalUI::draw_status(const DisplayLine& status_line,
const DisplayLine& mode_line,
const Face& default_face)
{
const LineCount status_line_pos = m_status_on_top ? 0 : m_dimensions.line;
m_window.move_cursor(status_line_pos);
m_window.draw(status_line.atoms(), default_face);
const auto mode_len = mode_line.length();
m_status_len = status_line.length();
const auto remaining = m_dimensions.column - m_status_len;
if (mode_len < remaining)
{
ColumnCount col = m_dimensions.column - mode_len;
m_window.move_cursor({status_line_pos, col});
m_window.draw(mode_line.atoms(), default_face);
}
else if (remaining > 2)
{
DisplayLine trimmed_mode_line = mode_line;
trimmed_mode_line.trim(mode_len + 2 - remaining, remaining - 2);
trimmed_mode_line.insert(trimmed_mode_line.begin(), { "", {} });
kak_assert(trimmed_mode_line.length() == remaining - 1);
ColumnCount col = m_dimensions.column - remaining + 1;
m_window.move_cursor({status_line_pos, col});
m_window.draw(trimmed_mode_line.atoms(), default_face);
}
if (m_set_title)
{
constexpr char suffix[] = " - Kakoune\007";
char buf[4 + 511 + 2] = "\033]2;";
// Fill title escape sequence buffer, removing non ascii characters
auto buf_it = &buf[4], buf_end = &buf[4 + 511 - (sizeof(suffix) - 2)];
for (auto& atom : mode_line)
{
const auto str = atom.content();
for (auto it = str.begin(), end = str.end();
it != end and buf_it != buf_end; utf8::to_next(it, end))
*buf_it++ = (*it >= 0x20 and *it <= 0x7e) ? *it : '?';
}
for (auto c : suffix)
*buf_it++ = c;
fputs(buf, stdout);
fflush(stdout);
}
m_dirty = true;
}
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void TerminalUI::check_resize(bool force)
{
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if (not force and not resize_pending)
return;
resize_pending = 0;
const int fd = open("/dev/tty", O_RDWR);
if (fd < 0)
return;
auto close_fd = on_scope_end([fd]{ ::close(fd); });
winsize ws;
if (::ioctl(fd, TIOCGWINSZ, &ws) != 0)
return;
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const bool info = (bool)m_info;
const bool menu = (bool)m_menu;
if (m_window) m_window.destroy();
if (info) m_info.destroy();
if (menu) m_menu.destroy();
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m_window.create({0, 0}, {ws.ws_row, ws.ws_col});
m_screen.create({0, 0}, {ws.ws_row, ws.ws_col});
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m_screen.hashes.clear();
kak_assert(m_window);
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m_dimensions = DisplayCoord{ws.ws_row-1, ws.ws_col};
// if (char* csr = tigetstr((char*)"csr"))
// putp(tparm(csr, 0, ws.ws_row));
if (menu)
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menu_show(Vector<DisplayLine>(std::move(m_menu.items)),
m_menu.anchor, m_menu.fg, m_menu.bg, m_menu.style);
if (info)
info_show(m_info.title, m_info.content, m_info.anchor, m_info.face, m_info.style);
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set_resize_pending();
}
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Optional<Key> TerminalUI::get_next_key()
{
if (stdin_closed)
{
set_signal_handler(SIGWINCH, SIG_DFL);
set_signal_handler(SIGHUP, SIG_DFL);
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if (m_window)
m_window.destroy();
m_stdin_watcher.disable();
return {};
}
check_resize();
if (m_resize_pending)
{
m_resize_pending = false;
return resize(dimensions());
}
static auto get_char = []() -> Optional<unsigned char> {
if (not fd_readable(STDIN_FILENO))
return {};
if (unsigned char c = 0; read(STDIN_FILENO, &c, 1) == 1)
return c;
stdin_closed = 1;
return {};
};
const auto c = get_char();
if (not c)
return {};
const cc_t erase = m_original_termios.c_cc[VERASE];
auto convert = [erase](Codepoint c) -> Codepoint {
if (c == control('m') or c == control('j'))
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return Key::Return;
if (c == control('i'))
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return Key::Tab;
if (c == erase)
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return Key::Backspace;
if (c == 127) // when it's not backspace
return Key::Delete;
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if (c == 27)
return Key::Escape;
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return c;
};
auto parse_key = [&convert](unsigned char c) -> Key {
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if (Codepoint cp = convert(c); cp > 255)
return Key{cp};
// Special case: you can type NUL with Ctrl-2 or Ctrl-Shift-2 or
// Ctrl-Backtick, but the most straightforward way is Ctrl-Space.
if (c == 0)
return ctrl(' ');
// Represent Ctrl-letter combinations in lower-case, to be clear
// that Shift is not involved.
if (c < 27)
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return ctrl(c - 1 + 'a');
// Represent Ctrl-symbol combinations in "upper-case", as they are
// traditionally-rendered.
// Note that Escape is handled elsewhere.
if (c < 32)
return ctrl(c - 1 + 'A');
struct Sentinel{};
struct CharIterator
{
unsigned char operator*() { if (not c) c = get_char().value_or((unsigned char)0); return *c; }
CharIterator& operator++() { c.reset(); return *this; }
bool operator==(const Sentinel&) const { return false; }
Optional<unsigned char> c;
};
return Key{utf8::codepoint(CharIterator{c}, Sentinel{})};
};
auto parse_mask = [](int mask) {
Key::Modifiers mod = Key::Modifiers::None;
if (mask & 1)
mod |= Key::Modifiers::Shift;
if (mask & 2)
mod |= Key::Modifiers::Alt;
if (mask & 4)
mod |= Key::Modifiers::Control;
return mod;
};
auto parse_csi = [this, &convert, &parse_mask]() -> Optional<Key> {
auto next_char = [] { return get_char().value_or((unsigned char)0xff); };
int params[16] = {};
auto c = next_char();
char private_mode = 0;
if (c == '?' or c == '<' or c == '=' or c == '>')
{
private_mode = c;
c = next_char();
}
for (int count = 0; count < 16 and c >= 0x30 && c <= 0x3f; c = next_char())
{
if (isdigit(c))
params[count] = params[count] * 10 + c - '0';
else if (c == ';')
++count;
else
return {};
}
if (c != '$' and (c < 0x40 or c > 0x7e))
return {};
auto mouse_button = [this](Key::Modifiers mod, Key::MouseButton button, Codepoint coord, bool release) {
auto mask = 1 << (int)button;
if (not release)
{
mod |= (m_mouse_state & mask) ? Key::Modifiers::MousePos : Key::Modifiers::MousePress;
m_mouse_state |= mask;
}
else
{
mod |= Key::Modifiers::MouseRelease;
m_mouse_state &= ~mask;
}
return Key{mod | Key::to_modifier(button), coord};
};
auto mouse_scroll = [this](Key::Modifiers mod, bool down) -> Key {
return {mod | Key::Modifiers::Scroll,
(Codepoint)((down ? 1 : -1) * m_wheel_scroll_amount)};
};
auto masked_key = [&](Codepoint key) {
int mask = std::max(params[1] - 1, 0);
Key::Modifiers modifiers = parse_mask(mask);
if (is_basic_alpha(key) and (modifiers & Key::Modifiers::Shift))
{
modifiers &= ~Key::Modifiers::Shift;
key = to_upper(key);
}
return Key{modifiers, key};
};
switch (c)
{
case '$':
switch (params[0])
{
case 23: case 24:
return Key{Key::Modifiers::Shift, Key::F11 + params[0] - 23}; // rxvt style
}
return {};
case 'A': return masked_key(Key::Up);
case 'B': return masked_key(Key::Down);
case 'C': return masked_key(Key::Right);
case 'D': return masked_key(Key::Left);
case 'E': return masked_key('5'); // Numeric keypad 5
case 'F': return masked_key(Key::End); // PC/xterm style
case 'H': return masked_key(Key::Home); // PC/xterm style
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case 'P': return masked_key(Key::F1);
case 'Q': return masked_key(Key::F2);
case 'R': return masked_key(Key::F3);
case 'S': return masked_key(Key::F4);
case '~':
switch (params[0])
{
case 1: return masked_key(Key::Home); // VT220/tmux style
case 2: return masked_key(Key::Insert);
case 3: return masked_key(Key::Delete);
case 4: return masked_key(Key::End); // VT220/tmux style
case 5: return masked_key(Key::PageUp);
case 6: return masked_key(Key::PageDown);
case 7: return masked_key(Key::Home); // rxvt style
case 8: return masked_key(Key::End); // rxvt style
case 11: case 12: case 13: case 14: case 15:
return masked_key(Key::F1 + params[0] - 11);
case 17: case 18: case 19: case 20: case 21:
return masked_key(Key::F6 + params[0] - 17);
case 23: case 24:
return masked_key(Key::F11 + params[0] - 23);
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case 25: case 26:
return Key{Key::Modifiers::Shift, Key::F3 + params[0] - 25}; // rxvt style
case 28: case 29:
return Key{Key::Modifiers::Shift, Key::F5 + params[0] - 28}; // rxvt style
case 31: case 32:
return Key{Key::Modifiers::Shift, Key::F7 + params[0] - 31}; // rxvt style
case 33: case 34:
return Key{Key::Modifiers::Shift, Key::F9 + params[0] - 33}; // rxvt style
}
return {};
case 'u':
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return masked_key(convert(static_cast<Codepoint>(params[0])));
case 'Z': return shift(Key::Tab);
case 'I': return {Key::FocusIn};
case 'O': return {Key::FocusOut};
case 'M': case 'm':
const bool sgr = private_mode == '<';
if (not sgr and c != 'M')
return {};
const Codepoint b = sgr ? params[0] : next_char() - 32;
const int x = (sgr ? params[1] : next_char() - 32) - 1;
const int y = (sgr ? params[2] : next_char() - 32) - 1;
auto coord = encode_coord({y - content_line_offset(), x});
Key::Modifiers mod = parse_mask((b >> 2) & 0x7);
switch (const int code = b & 0x43; code)
{
case 0: case 1: case 2:
return mouse_button(mod, Key::MouseButton{code}, coord, c == 'm');
case 3:
if (sgr)
return {};
else if (int guess = ffs(m_mouse_state) - 1; 0 <= guess and guess < 3)
return mouse_button(mod, Key::MouseButton{guess}, coord, true);
break;
case 64: return mouse_scroll(mod, false);
case 65: return mouse_scroll(mod, true);
}
return Key{Key::Modifiers::MousePos, coord};
}
return {};
};
auto parse_ss3 = [&parse_mask]() -> Optional<Key> {
int raw_mask = 0;
char code = '0';
do {
raw_mask = raw_mask * 10 + (code - '0');
code = get_char().value_or((unsigned char)0xff);
} while (code >= '0' and code <= '9');
Key::Modifiers mod = parse_mask(std::max(raw_mask - 1, 0));
switch (code)
{
case ' ': return Key{mod, ' '};
case 'A': return Key{mod, Key::Up};
case 'B': return Key{mod, Key::Down};
case 'C': return Key{mod, Key::Right};
case 'D': return Key{mod, Key::Left};
case 'F': return Key{mod, Key::End};
case 'H': return Key{mod, Key::Home};
case 'I': return Key{mod, Key::Tab};
case 'M': return Key{mod, Key::Return};
case 'P': return Key{mod, Key::F1};
case 'Q': return Key{mod, Key::F2};
case 'R': return Key{mod, Key::F3};
case 'S': return Key{mod, Key::F4};
case 'X': return Key{mod, '='};
case 'j': return Key{mod, '*'};
case 'k': return Key{mod, '+'};
case 'l': return Key{mod, ','};
case 'm': return Key{mod, '-'};
case 'n': return Key{mod, '.'};
case 'o': return Key{mod, '/'};
case 'p': return Key{mod, '0'};
case 'q': return Key{mod, '1'};
case 'r': return Key{mod, '2'};
case 's': return Key{mod, '3'};
case 't': return Key{mod, '4'};
case 'u': return Key{mod, '5'};
case 'v': return Key{mod, '6'};
case 'w': return Key{mod, '7'};
case 'x': return Key{mod, '8'};
case 'y': return Key{mod, '9'};
default: return {};
}
};
if (*c != 27)
return parse_key(*c);
if (auto next = get_char())
{
if (*next == '[') // potential CSI
return parse_csi().value_or(alt('['));
if (*next == 'O') // potential SS3
return parse_ss3().value_or(alt('O'));
return alt(parse_key(*next));
}
return Key{Key::Escape};
}
template<typename T>
T div_round_up(T a, T b)
{
return (a - T(1)) / b + T(1);
}
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void TerminalUI::draw_menu()
{
// menu show may have not created the window if it did not fit.
// so be tolerant.
if (not m_menu)
return;
const int item_count = (int)m_menu.items.size();
if (m_menu.columns == 0)
{
const auto win_width = m_menu.size.column - 4;
kak_assert(m_menu.size.line == 1);
ColumnCount pos = 0;
m_menu.move_cursor({0, 0});
m_menu.draw(DisplayAtom(m_menu.first_item > 0 ? "< " : " "), m_menu.bg);
int i = m_menu.first_item;
for (; i < item_count and pos < win_width; ++i)
{
const DisplayLine& item = m_menu.items[i];
const ColumnCount item_width = item.length();
auto& face = i == m_menu.selected_item ? m_menu.fg : m_menu.bg;
m_menu.draw(item.atoms(), face);
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if (pos + item_width < win_width)
m_menu.draw(DisplayAtom(" "), m_menu.bg);
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else
{
m_menu.move_cursor({0, win_width+2});
m_menu.draw(DisplayAtom(""), m_menu.bg);
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}
pos += item_width + 1;
}
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m_menu.move_cursor({0, win_width+3});
m_menu.draw(DisplayAtom(i == item_count ? " " : ">"), m_menu.bg);
m_dirty = true;
return;
}
const LineCount menu_lines = div_round_up(item_count, m_menu.columns);
const LineCount win_height = m_menu.size.line;
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kak_assert(win_height <= menu_lines);
const ColumnCount column_width = (m_menu.size.column - 1) / m_menu.columns;
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const LineCount mark_height = min(div_round_up(sq(win_height), menu_lines),
win_height);
const int menu_cols = div_round_up(item_count, (int)m_menu.size.line);
const int first_col = m_menu.first_item / (int)m_menu.size.line;
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const LineCount mark_line = (win_height - mark_height) * first_col / max(1, menu_cols - m_menu.columns);
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for (auto line = 0_line; line < win_height; ++line)
{
for (int col = 0; col < m_menu.columns; ++col)
{
m_menu.move_cursor({line, col * column_width});
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int item_idx = (first_col + col) * (int)m_menu.size.line + (int)line;
auto& face = item_idx < item_count and item_idx == m_menu.selected_item ? m_menu.fg : m_menu.bg;
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auto atoms = item_idx < item_count ? m_menu.items[item_idx].atoms() : ConstArrayView<DisplayAtom>{};
m_menu.draw(atoms, face);
}
const bool is_mark = line >= mark_line and line < mark_line + mark_height;
m_menu.move_cursor({line, m_menu.size.column - 1});
m_menu.draw(DisplayAtom(is_mark ? "" : ""), m_menu.bg);
}
m_dirty = true;
}
static LineCount height_limit(MenuStyle style)
{
switch (style)
{
case MenuStyle::Inline: return 10_line;
case MenuStyle::Prompt: return 10_line;
case MenuStyle::Search: return 3_line;
}
kak_assert(false);
return 0_line;
}
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void TerminalUI::menu_show(ConstArrayView<DisplayLine> items,
DisplayCoord anchor, Face fg, Face bg,
MenuStyle style)
{
if (m_menu)
{
m_menu.destroy();
m_dirty = true;
}
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m_menu.fg = fg;
m_menu.bg = bg;
m_menu.style = style;
m_menu.anchor = anchor;
if (m_dimensions.column <= 2)
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return;
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const int item_count = items.size();
m_menu.items.clear(); // make sure it is empty
m_menu.items.reserve(item_count);
const auto longest = accumulate(items | transform(&DisplayLine::length),
1_col, [](auto&& lhs, auto&& rhs) { return std::max(lhs, rhs); });
const ColumnCount max_width = m_dimensions.column - 1;
const bool is_inline = style == MenuStyle::Inline;
const bool is_search = style == MenuStyle::Search;
m_menu.columns = is_search ? 0 : (is_inline ? 1 : max((int)(max_width / (longest+1)), 1));
const LineCount max_height = min(height_limit(style), max(anchor.line, m_dimensions.line - anchor.line - 1));
const LineCount height = is_search ?
1 : (min<LineCount>(max_height, div_round_up(item_count, m_menu.columns)));
const ColumnCount maxlen = (m_menu.columns > 1 and item_count > 1) ?
max_width / m_menu.columns - 1 : max_width;
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for (auto& item : items)
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{
m_menu.items.push_back(item);
m_menu.items.back().trim(0, maxlen);
kak_assert(m_menu.items.back().length() <= maxlen);
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}
if (is_inline)
anchor.line += content_line_offset();
LineCount line = anchor.line + 1;
ColumnCount column = std::max(0_col, std::min(anchor.column, m_dimensions.column - longest - 1));
if (is_search)
{
line = m_status_on_top ? 0_line : m_dimensions.line;
column = m_dimensions.column / 2;
}
else if (not is_inline)
line = m_status_on_top ? 1_line : m_dimensions.line - height;
else if (line + height > m_dimensions.line)
line = anchor.line - height;
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const auto width = is_search ? m_dimensions.column - m_dimensions.column / 2
: (is_inline ? min(longest+1, m_dimensions.column)
: m_dimensions.column);
m_menu.create({line, column}, {height, width});
m_menu.selected_item = item_count;
m_menu.first_item = 0;
draw_menu();
if (m_info)
info_show(m_info.title, m_info.content,
m_info.anchor, m_info.face, m_info.style);
}
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void TerminalUI::menu_select(int selected)
{
const int item_count = m_menu.items.size();
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if (selected < 0 or selected >= item_count)
{
m_menu.selected_item = -1;
m_menu.first_item = 0;
}
else if (m_menu.columns == 0) // Do not columnize
{
m_menu.selected_item = selected;
const ColumnCount width = m_menu.size.column - 3;
int first = 0;
ColumnCount item_col = 0;
for (int i = 0; i <= selected; ++i)
{
const ColumnCount item_width = m_menu.items[i].length() + 1;
if (item_col + item_width > width)
{
first = i;
item_col = item_width;
}
else
item_col += item_width;
}
m_menu.first_item = first;
}
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else
{
m_menu.selected_item = selected;
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const int menu_cols = div_round_up(item_count, (int)m_menu.size.line);
const int first_col = m_menu.first_item / (int)m_menu.size.line;
const int selected_col = m_menu.selected_item / (int)m_menu.size.line;
if (selected_col < first_col)
m_menu.first_item = selected_col * (int)m_menu.size.line;
if (selected_col >= first_col + m_menu.columns)
m_menu.first_item = min(selected_col, menu_cols - m_menu.columns) * (int)m_menu.size.line;
}
draw_menu();
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}
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void TerminalUI::menu_hide()
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{
if (not m_menu)
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return;
m_menu.items.clear();
m_menu.destroy();
m_dirty = true;
// Recompute info as it does not have to avoid the menu anymore
if (m_info)
info_show(m_info.title, m_info.content, m_info.anchor, m_info.face, m_info.style);
}
static DisplayCoord compute_pos(DisplayCoord anchor, DisplayCoord size,
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TerminalUI::Rect rect, TerminalUI::Rect to_avoid,
bool prefer_above)
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{
DisplayCoord pos;
if (prefer_above)
{
pos = anchor - DisplayCoord{size.line};
if (pos.line < 0)
prefer_above = false;
}
auto rect_end = rect.pos + rect.size;
if (not prefer_above)
{
pos = anchor + DisplayCoord{1_line};
if (pos.line + size.line >= rect_end.line)
pos.line = max(rect.pos.line, anchor.line - size.line);
}
if (pos.column + size.column >= rect_end.column)
pos.column = max(rect.pos.column, rect_end.column - size.column);
if (to_avoid.size != DisplayCoord{})
{
DisplayCoord to_avoid_end = to_avoid.pos + to_avoid.size;
DisplayCoord end = pos + size;
// check intersection
if (not (end.line < to_avoid.pos.line or end.column < to_avoid.pos.column or
pos.line > to_avoid_end.line or pos.column > to_avoid_end.column))
{
pos.line = min(to_avoid.pos.line, anchor.line) - size.line;
// if above does not work, try below
if (pos.line < 0)
pos.line = max(to_avoid_end.line, anchor.line);
}
}
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return pos;
}
static DisplayLineList wrap_lines(const DisplayLineList& lines, ColumnCount max_width)
{
DisplayLineList result;
for (auto line : lines)
{
ColumnCount column = 0;
for (auto it = line.begin(); it != line.end(); )
{
auto length = it->length();
column += length;
if (column > max_width)
{
auto content = it->content().substr(0, length - (column - max_width));
auto pos = find_if(content | reverse(), [](char c) { return not is_word(c); });
if (pos != content.rend())
content = {content.begin(), pos.base()};
if (not content.empty())
it = ++line.split(it, content.column_length());
result.push_back(AtomList(std::make_move_iterator(line.begin()),
std::make_move_iterator(it)));
it = line.erase(line.begin(), it);
column = 0;
}
else
++it;
}
result.push_back(std::move(line));
}
return result;
}
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void TerminalUI::info_show(const DisplayLine& title, const DisplayLineList& content,
DisplayCoord anchor, Face face, InfoStyle style)
{
info_hide();
m_info.title = title;
m_info.content = content;
m_info.anchor = anchor;
m_info.face = face;
m_info.style = style;
const bool framed = style == InfoStyle::Prompt or style == InfoStyle::Modal;
const bool assisted = style == InfoStyle::Prompt and m_assistant.size() != 0;
DisplayCoord max_size = m_dimensions;
if (style == InfoStyle::MenuDoc)
max_size.column = std::max(m_dimensions.column - (m_menu.pos.column + m_menu.size.column),
m_menu.pos.column);
else if (style != InfoStyle::Modal)
max_size.line -= m_menu.size.line;
const auto max_content_width = max_size.column - (framed ? 4 : 2) - (assisted ? m_assistant[0].column_length() : 0);
if (max_content_width <= 0)
return;
auto compute_size = [](const DisplayLineList& lines) -> DisplayCoord {
return {(int)lines.size(), accumulate(lines, 0_col, [](ColumnCount c, const DisplayLine& l) { return std::max(c, l.length()); })};
};
DisplayCoord content_size = compute_size(content);
const bool wrap = content_size.column > max_content_width;
DisplayLineList wrapped_content;
if (wrap)
{
wrapped_content = wrap_lines(content, max_content_width);
content_size = compute_size(wrapped_content);
}
const auto& lines = wrap ? wrapped_content : content;
DisplayCoord size{content_size.line, std::max(content_size.column, title.length() + (framed ? 2 : 0))};
if (framed)
size += {2, 4};
if (assisted)
size = {std::max(LineCount{(int)m_assistant.size()-1}, size.line), size.column + m_assistant[0].column_length()};
size = {std::min(max_size.line, size.line), std::min(max_size.column, size.column)};
if ((framed and size.line < 3) or size.line <= 0)
return;
const Rect rect = {content_line_offset(), m_dimensions};
if (style == InfoStyle::Prompt)
{
anchor = DisplayCoord{m_status_on_top ? 0 : m_dimensions.line, m_dimensions.column-1};
anchor = compute_pos(anchor, size, rect, m_menu, style == InfoStyle::InlineAbove);
}
else if (style == InfoStyle::Modal)
{
auto half = [](const DisplayCoord& c) { return DisplayCoord{c.line / 2, c.column / 2}; };
anchor = rect.pos + half(rect.size) - half(size);
}
else if (style == InfoStyle::MenuDoc)
{
const auto right_max_width = m_dimensions.column - (m_menu.pos.column + m_menu.size.column);
const auto left_max_width = m_menu.pos.column;
anchor.line = m_menu.pos.line;
if (size.column <= right_max_width or right_max_width >= left_max_width)
anchor.column = m_menu.pos.column + m_menu.size.column;
else
anchor.column = m_menu.pos.column - size.column;
}
else
{
anchor = compute_pos(anchor, size, rect, m_menu, style == InfoStyle::InlineAbove);
anchor.line += content_line_offset();
}
m_info.create(anchor, size);
auto draw_atoms = [&](auto&&... args) {
auto draw = overload(
[&](String str) { m_info.draw(DisplayAtom{std::move(str)}, face); },
[&](const DisplayLine& atoms) { m_info.draw(atoms.atoms(), face); });
(draw(args), ...);
};
for (auto line = 0_line; line < size.line; ++line)
{
constexpr Codepoint dash{L''};
constexpr Codepoint dotted_dash{L''};
m_info.move_cursor(line);
if (assisted)
{
const auto assistant_top_margin = (size.line - m_assistant.size()+1) / 2;
StringView assistant_line = (line >= assistant_top_margin) ?
m_assistant[(int)min(line - assistant_top_margin, LineCount{(int)m_assistant.size()}-1)]
: m_assistant[(int)m_assistant.size()-1];
draw_atoms(assistant_line.str());
}
if (not framed)
draw_atoms(lines[(int)line]);
else if (line == 0)
{
if (title.atoms().empty() or content_size.column < 2)
draw_atoms("╭─" + String{dash, content_size.column} + "─╮");
else
{
auto trimmed_title = title;
trimmed_title.trim(0, content_size.column - 2);
auto dash_count = content_size.column - trimmed_title.length() - 2;
String left{dash, dash_count / 2};
String right{dash, dash_count - dash_count / 2};
draw_atoms("╭─" + left + "", trimmed_title, "" + right +"─╮");
}
}
else if (line < size.line - 1 and line <= lines.size())
{
auto info_line = lines[(int)line - 1];
const bool trimmed = info_line.trim(0, content_size.column);
const ColumnCount padding = content_size.column - info_line.length();
draw_atoms("", info_line, String{' ', padding} + (trimmed ? "…│" : ""));
}
else if (line == std::min<LineCount>((int)lines.size() + 1, size.line - 1))
draw_atoms("╰─" + String(line > lines.size() ? dash : dotted_dash, content_size.column) + "─╯");
}
m_dirty = true;
}
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void TerminalUI::info_hide()
{
if (not m_info)
return;
m_info.destroy();
m_dirty = true;
}
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void TerminalUI::set_on_key(OnKeyCallback callback)
{
m_on_key = std::move(callback);
EventManager::instance().force_signal(0);
}
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DisplayCoord TerminalUI::dimensions()
{
return m_dimensions;
}
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LineCount TerminalUI::content_line_offset() const
{
return m_status_on_top ? 1 : 0;
}
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void TerminalUI::set_resize_pending()
{
m_resize_pending = true;
EventManager::instance().force_signal(0);
}
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void TerminalUI::setup_terminal()
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{
// enable alternative screen buffer
fputs("\033[?1049h", stdout);
// enable focus notify
fputs("\033[?1004h", stdout);
// request CSI u style key reporting
fputs("\033[>4;1m", stdout);
// save the current window title
fputs("\033[22t", stdout);
// hide cursor
fputs("\033[?25l", stdout);
// set application keypad mode, so the keypad keys send unique codes
fputs("\033=", stdout);
fflush(stdout);
}
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void TerminalUI::restore_terminal()
{
fputs("\033>", stdout);
fputs("\033[?25h", stdout);
fputs("\033[23t", stdout);
fputs("\033[>4;0m", stdout);
fputs("\033[?1004l", stdout);
fputs("\033[?1049l", stdout);
// set the terminal output back to default colours and style
fputs("\033[m", stdout);
fflush(stdout);
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}
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void TerminalUI::enable_mouse(bool enabled)
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{
if (enabled == m_mouse_enabled)
return;
m_mouse_enabled = enabled;
if (enabled)
{
// force SGR mode
fputs("\033[?1006h", stdout);
// enable mouse
fputs("\033[?1000h", stdout);
// force enable report mouse position
fputs("\033[?1002h", stdout);
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}
else
{
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fputs("\033[?1002l", stdout);
fputs("\033[?1000l", stdout);
fputs("\033[?1006l", stdout);
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}
fflush(stdout);
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}
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void TerminalUI::set_ui_options(const Options& options)
{
{
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auto it = options.find("terminal_assistant"_sv);
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if (it == options.end() or it->value == "clippy")
m_assistant = assistant_clippy;
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else if (it->value == "cat")
m_assistant = assistant_cat;
else if (it->value == "dilbert")
m_assistant = assistant_dilbert;
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else if (it->value == "none" or it->value == "off")
m_assistant = ConstArrayView<StringView>{};
}
{
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auto it = options.find("terminal_status_on_top"_sv);
m_status_on_top = it != options.end() and
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(it->value == "yes" or it->value == "true");
}
{
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auto it = options.find("terminal_set_title"_sv);
m_set_title = it == options.end() or
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(it->value == "yes" or it->value == "true");
}
{
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auto it = options.find("terminal_shift_function_key"_sv);
m_shift_function_key = it != options.end() ?
str_to_int_ifp(it->value).value_or(default_shift_function_key)
: default_shift_function_key;
}
{
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auto enable_mouse_it = options.find("terminal_enable_mouse"_sv);
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enable_mouse(enable_mouse_it == options.end() or
enable_mouse_it->value == "yes" or
enable_mouse_it->value == "true");
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auto wheel_up_it = options.find("terminal_wheel_up_button"_sv);
m_wheel_up_button = wheel_up_it != options.end() ?
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str_to_int_ifp(wheel_up_it->value).value_or(4) : 4;
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auto wheel_down_it = options.find("terminal_wheel_down_button"_sv);
m_wheel_down_button = wheel_down_it != options.end() ?
str_to_int_ifp(wheel_down_it->value).value_or(5) : 5;
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auto wheel_scroll_amount_it = options.find("terminal_wheel_scroll_amount"_sv);
m_wheel_scroll_amount = wheel_scroll_amount_it != options.end() ?
str_to_int_ifp(wheel_scroll_amount_it->value).value_or(3) : 3;
}
{
auto it = options.find("ncurses_padding_char"_sv);
if (it == options.end())
// Defaults to tilde.
m_padding_char = DisplayAtom("~");
else if (it->value.column_length() < 1)
// Do not allow empty string, use space instead.
m_padding_char = DisplayAtom(" ");
else
m_padding_char = DisplayAtom(it->value);
}
{
auto it = options.find("ncurses_padding_fill"_sv);
m_padding_fill = it != options.end() and
(it->value == "yes" or it->value == "true");
}
}
}