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kakoune/src/ncurses.cc

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C++
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#include "ncurses.hh"
#include "display_buffer.hh"
#include "event_manager.hh"
#include "register_manager.hh"
#include "utf8_iterator.hh"
#include <map>
#include <ncurses.h>
#include <signal.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <fcntl.h>
namespace Kakoune
{
struct NCursesWin : WINDOW {};
static void set_attribute(int attribute, bool on)
{
if (on)
attron(attribute);
else
attroff(attribute);
}
static bool operator<(const Color& lhs, const Color& rhs)
{
if (lhs.color == rhs.color and lhs.color == Colors::RGB)
return lhs.r == rhs.r ? (lhs.g == rhs.g ? lhs.b < rhs.b
: lhs.g < rhs.g)
: lhs.r < rhs.r;
return lhs.color < rhs.color;
}
static int nc_color(const Color& color)
{
static std::map<Color, int> colors = {
{ Colors::Default, -1 },
{ Colors::Black, COLOR_BLACK },
{ Colors::Red, COLOR_RED },
{ Colors::Green, COLOR_GREEN },
{ Colors::Yellow, COLOR_YELLOW },
{ Colors::Blue, COLOR_BLUE },
{ Colors::Magenta, COLOR_MAGENTA },
{ Colors::Cyan, COLOR_CYAN },
{ Colors::White, COLOR_WHITE },
};
static int next_color = 8;
auto it = colors.find(color);
if (it != colors.end())
return it->second;
else if (can_change_color() and COLORS > 8)
{
kak_assert(color.color == Colors::RGB);
if (next_color > COLORS)
next_color = 8;
init_color(next_color,
color.r * 1000 / 255,
color.g * 1000 / 255,
color.b * 1000 / 255);
colors[color] = next_color;
return next_color++;
}
else
{
kak_assert(color.color == Colors::RGB);
// project to closest color.
struct BuiltinColor { int id; unsigned char r, g, b; };
static constexpr BuiltinColor builtins[] = {
{ COLOR_BLACK, 0, 0, 0 },
{ COLOR_RED, 255, 0, 0 },
{ COLOR_GREEN, 0, 255, 0 },
{ COLOR_YELLOW, 255, 255, 0 },
{ COLOR_BLUE, 0, 0, 255 },
{ COLOR_MAGENTA, 255, 0, 255 },
{ COLOR_CYAN, 0, 255, 255 },
{ COLOR_WHITE, 255, 255, 255 }
};
auto sq = [](int x) { return x * x; };
int lowestDist = INT_MAX;
int closestCol = -1;
for (auto& col : builtins)
{
int dist = sq(color.r - col.r) + sq(color.g - col.g) + sq(color.b - col.b);
if (dist < lowestDist)
{
lowestDist = dist;
closestCol = col.id;
}
}
return closestCol;
}
}
static int get_color_pair(const ColorPair& colors)
{
static std::map<ColorPair, int> colorpairs;
static int next_pair = 1;
auto it = colorpairs.find(colors);
if (it != colorpairs.end())
return it->second;
else
{
init_pair(next_pair, nc_color(colors.first), nc_color(colors.second));
colorpairs[colors] = next_pair;
return next_pair++;
}
}
static void set_color(WINDOW* window, const ColorPair colors)
{
static int current_pair = -1;
if (current_pair != -1)
wattroff(window, COLOR_PAIR(current_pair));
if (colors.first != Colors::Default or colors.second != Colors::Default)
{
current_pair = get_color_pair(colors);
wattron(window, COLOR_PAIR(current_pair));
}
}
void on_term_resize(int)
{
ungetch(KEY_RESIZE);
EventManager::instance().force_signal(0);
}
void on_sigint(int)
{
ungetch(CTRL('c'));
EventManager::instance().force_signal(0);
}
NCursesUI::NCursesUI()
: m_stdin_watcher{0, [this](FDWatcher&){ if (m_input_callback) m_input_callback(); }},
m_status_line{-1}
{
initscr();
cbreak();
noecho();
nonl();
intrflush(stdscr, false);
keypad(stdscr, true);
curs_set(0);
start_color();
use_default_colors();
ESCDELAY=25;
signal(SIGWINCH, on_term_resize);
signal(SIGINT, on_sigint);
update_dimensions();
}
NCursesUI::~NCursesUI()
{
endwin();
signal(SIGWINCH, SIG_DFL);
signal(SIGINT, SIG_DFL);
}
void NCursesUI::redraw()
{
wnoutrefresh(stdscr);
if (m_menu_win)
{
redrawwin(m_menu_win);
wnoutrefresh(m_menu_win);
}
if (m_info_win)
{
redrawwin(m_info_win);
wnoutrefresh(m_info_win);
}
doupdate();
}
using Utf8Policy = utf8::InvalidBytePolicy::Pass;
using Utf8Iterator = utf8::utf8_iterator<String::const_iterator, Utf8Policy>;
void addutf8str(WINDOW* win, Utf8Iterator begin, Utf8Iterator end)
{
waddstr(win, std::string(begin.base(), end.base()).c_str());
}
static DisplayCoord window_size(WINDOW* win)
{
DisplayCoord size;
getmaxyx(win, (int&)size.line, (int&)size.column);
return size;
}
static DisplayCoord window_pos(WINDOW* win)
{
DisplayCoord pos;
getbegyx(win, (int&)pos.line, (int&)pos.column);
return pos;
}
void NCursesUI::update_dimensions()
{
m_dimensions = window_size(stdscr);
--m_dimensions.line;
}
void NCursesUI::draw_line(const DisplayLine& line, CharCount col_index) const
{
for (const DisplayAtom& atom : line)
{
set_attribute(A_UNDERLINE, atom.attribute & Underline);
set_attribute(A_REVERSE, atom.attribute & Reverse);
set_attribute(A_BLINK, atom.attribute & Blink);
set_attribute(A_BOLD, atom.attribute & Bold);
set_color(stdscr, atom.colors);
String content = atom.content.content();
if (content[content.length()-1] == '\n' and
content.char_length() - 1 < m_dimensions.column - col_index)
{
addutf8str(stdscr, Utf8Iterator(content.begin()), Utf8Iterator(content.end())-1);
addch(' ');
}
else
{
Utf8Iterator begin(content.begin()), end(content.end());
if (end - begin > m_dimensions.column - col_index)
end = begin + (m_dimensions.column - col_index);
addutf8str(stdscr, begin, end);
col_index += end - begin;
}
}
}
void NCursesUI::draw(const DisplayBuffer& display_buffer,
const DisplayLine& mode_line)
{
LineCount line_index = 0;
for (const DisplayLine& line : display_buffer.lines())
{
wmove(stdscr, (int)line_index, 0);
wclrtoeol(stdscr);
draw_line(line, 0);
++line_index;
}
set_attribute(A_UNDERLINE, 0);
set_attribute(A_REVERSE, 0);
set_attribute(A_BLINK, 0);
set_attribute(A_BOLD, 0);
set_color(stdscr, { Colors::Blue, Colors::Default });
for (;line_index < m_dimensions.line; ++line_index)
{
move((int)line_index, 0);
clrtoeol();
addch('~');
}
move((int)m_dimensions.line, 0);
clrtoeol();
draw_line(m_status_line, 0);
CharCount status_len = mode_line.length();
// only draw mode_line if it does not overlap one status line
if (m_dimensions.column - m_status_line.length() > status_len + 1)
{
CharCount col = m_dimensions.column - status_len;
move((int)m_dimensions.line, (int)col);
draw_line(mode_line, col);
}
const char* tsl = tigetstr((char*)"tsl");
const char* fsl = tigetstr((char*)"fsl");
if (tsl != 0 and (ptrdiff_t)tsl != -1 and fsl != 0 and (ptrdiff_t)fsl != -1)
{
String title;
for (auto& atom : mode_line)
title += atom.content.content();
title += " - Kakoune";
printf("%s%s%s", tsl, title.c_str(), fsl);
}
redraw();
}
bool NCursesUI::is_key_available()
{
timeout(0);
const int c = getch();
if (c != ERR)
ungetch(c);
timeout(-1);
return c != ERR;
}
Key NCursesUI::get_key()
{
const int c = getch();
if (c > 0 and c < 27)
{
if (c == CTRL('l'))
redrawwin(stdscr);
return {Key::Modifiers::Control, Codepoint(c) - 1 + 'a'};
}
else if (c == 27)
{
timeout(0);
const Codepoint new_c = getch();
timeout(-1);
if (new_c != ERR)
return {Key::Modifiers::Alt, new_c};
else
return Key::Escape;
}
else if (c == KEY_RESIZE)
{
int fd = open("/dev/tty", O_RDWR);
winsize ws;
if (fd != -1 and ioctl(fd, TIOCGWINSZ, (void*)&ws) == 0)
{
close(fd);
resizeterm(ws.ws_row, ws.ws_col);
update_dimensions();
}
return Key::Invalid;
}
else switch (c)
{
case KEY_BACKSPACE: case 127: return Key::Backspace;
case KEY_UP: return Key::Up;
case KEY_DOWN: return Key::Down;
case KEY_LEFT: return Key::Left;
case KEY_RIGHT: return Key::Right;
case KEY_PPAGE: return Key::PageUp;
case KEY_NPAGE: return Key::PageDown;
case KEY_HOME: return Key::Home;
case KEY_END: return Key::End;
case KEY_BTAB: return Key::BackTab;
}
if (c >= 0 and c < 256)
{
ungetch(c);
struct getch_iterator
{
int operator*() { return getch(); }
getch_iterator& operator++() { return *this; }
getch_iterator& operator++(int) { return *this; }
};
return utf8::codepoint(getch_iterator{});
}
return Key::Invalid;
}
void NCursesUI::print_status(const DisplayLine& status)
{
m_status_line = status;
move((int)m_dimensions.line, 0);
clrtoeol();
draw_line(status, 0);
redraw();
}
void NCursesUI::draw_menu()
{
kak_assert(m_menu_win);
auto menu_fg = get_color_pair(m_menu_fg);
auto menu_bg = get_color_pair(m_menu_bg);
auto scroll_fg = get_color_pair({ Colors::White, Colors::White });
auto scroll_bg = get_color_pair(m_menu_bg);
wattron(m_menu_win, COLOR_PAIR(menu_bg));
wbkgdset(m_menu_win, COLOR_PAIR(menu_bg));
DisplayCoord menu_size = window_size(m_menu_win);
CharCount column_width = (menu_size.column - 1) / m_menu_columns;
LineCount mark_line = (menu_size.line * m_selected_choice) / (int)m_choices.size();
for (auto line = 0_line; line < menu_size.line; ++line)
{
wmove(m_menu_win, (int)line, 0);
for (int col = 0; col < m_menu_columns; ++col)
{
int choice_idx = (int)(m_menu_top_line + line) * m_menu_columns + col;
if (choice_idx >= m_choices.size())
break;
if (choice_idx == m_selected_choice)
wattron(m_menu_win, COLOR_PAIR(menu_fg));
auto& choice = m_choices[choice_idx];
auto begin = choice.cbegin();
auto end = utf8::advance(begin, choice.cend(), column_width);
addutf8str(m_menu_win, begin, end);
for (auto pad = column_width - utf8::distance(begin, end); pad > 0; --pad)
waddch(m_menu_win, ' ');
wattron(m_menu_win, COLOR_PAIR(menu_bg));
}
wclrtoeol(m_menu_win);
wmove(m_menu_win, (int)line, (int)menu_size.column - 1);
wattron(m_menu_win, COLOR_PAIR(line == mark_line ? scroll_fg : scroll_bg));
waddch(m_menu_win, ' ');
wattron(m_menu_win, COLOR_PAIR(menu_bg));
}
redraw();
}
void NCursesUI::menu_show(const memoryview<String>& choices,
DisplayCoord anchor, ColorPair fg, ColorPair bg,
MenuStyle style)
{
kak_assert(m_menu_win == nullptr);
kak_assert(m_choices.empty());
m_menu_fg = fg;
m_menu_bg = bg;
DisplayCoord maxsize = window_size(stdscr);
maxsize.column -= anchor.column;
if (maxsize.column <= 2)
return;
m_choices.reserve(choices.size());
CharCount longest = 0;
const CharCount maxlen = std::min((int)maxsize.column-2, 200);
for (auto& choice : choices)
{
m_choices.push_back(choice.substr(0_char, maxlen));
longest = std::max(longest, m_choices.back().char_length());
}
longest += 1;
m_menu_columns = (style == MenuStyle::Prompt) ? (int)((maxsize.column -1) / longest) : 1;
int lines = std::min(10, (int)ceilf((float)m_choices.size()/m_menu_columns));
DisplayCoord pos = { anchor.line+1, anchor.column };
if (pos.line + lines >= maxsize.line)
pos.line = anchor.line - lines;
DisplayCoord size = { lines, style == MenuStyle::Prompt ? maxsize.column : longest };
m_selected_choice = 0;
m_menu_top_line = 0;
m_menu_win = (NCursesWin*)newwin((int)size.line, (int)size.column,
(int)pos.line, (int)pos.column);
draw_menu();
}
void NCursesUI::menu_select(int selected)
{
if (selected < 0 or selected >= m_choices.size())
{
m_selected_choice = -1;
m_menu_top_line = 0;
}
else
{
m_selected_choice = selected;
LineCount selected_line = m_selected_choice / m_menu_columns;
DisplayCoord menu_size = window_size(m_menu_win);
if (selected_line < m_menu_top_line)
m_menu_top_line = selected_line;
if (selected_line >= m_menu_top_line + menu_size.line)
m_menu_top_line = selected_line;
}
draw_menu();
}
void NCursesUI::menu_hide()
{
if (not m_menu_win)
return;
m_choices.clear();
wredrawln(stdscr, (int)window_pos(m_menu_win).line, (int)window_size(m_menu_win).line);
delwin(m_menu_win);
m_menu_win = nullptr;
redraw();
}
static DisplayCoord compute_needed_size(const String& str)
{
DisplayCoord res{1,0};
CharCount line_len = 0;
for (Utf8Iterator begin{str.begin()}, end{str.end()}; begin != end; ++begin)
{
if (*begin == '\n')
{
// ignore last '\n', no need to show an empty line
if (begin+1 == end)
break;
res.column = std::max(res.column, line_len);
line_len = 0;
++res.line;
}
else
{
++line_len;
res.column = std::max(res.column, line_len);
}
}
return res;
}
static DisplayCoord compute_pos(const DisplayCoord& anchor,
const DisplayCoord& size,
WINDOW* opt_window_to_avoid = nullptr)
{
DisplayCoord scrsize = window_size(stdscr);
DisplayCoord pos = { anchor.line+1, anchor.column };
if (pos.line + size.line >= scrsize.line)
pos.line = std::max(0_line, anchor.line - size.line);
if (pos.column + size.column >= scrsize.column)
pos.column = std::max(0_char, anchor.column - size.column+1);
if (opt_window_to_avoid)
{
DisplayCoord winbeg = window_pos(opt_window_to_avoid);
DisplayCoord winend = winbeg + window_size(opt_window_to_avoid);
DisplayCoord end = pos + size;
// check intersection
if (not (end.line < winbeg.line or end.column < winbeg.column or
pos.line > winend.line or pos.column > winend.column))
{
pos.line = std::min(winbeg.line, anchor.line) - size.line;
// if above does not work, try below
if (pos.line < 0)
pos.line = std::max(winend.line, anchor.line);
}
}
return pos;
}
void NCursesUI::info_show(const String& content, DisplayCoord anchor,
ColorPair colors, MenuStyle style)
{
kak_assert(m_info_win == nullptr);
DisplayCoord size = compute_needed_size(content);
if (style == MenuStyle::Prompt)
size.column = window_size(stdscr).column - anchor.column;
DisplayCoord pos = compute_pos(anchor, size, m_menu_win);
m_info_win = (NCursesWin*)newwin((int)size.line, (int)size.column,
(int)pos.line, (int)pos.column);
wbkgd(m_info_win, COLOR_PAIR(get_color_pair(colors)));
int line = 0;
auto it = content.begin(), end = content.end();
while (true)
{
wmove(m_info_win, line++, 0);
auto eol = std::find_if(it, end, [](char c) { return c == '\n'; });
addutf8str(m_info_win, Utf8Iterator(it), Utf8Iterator(eol));
if (eol == end)
break;
it = eol + 1;
}
redraw();
}
void NCursesUI::info_hide()
{
if (not m_info_win)
return;
wredrawln(stdscr, (int)window_pos(m_info_win).line, (int)window_size(m_info_win).line);
delwin(m_info_win);
m_info_win = nullptr;
redraw();
}
DisplayCoord NCursesUI::dimensions()
{
return m_dimensions;
}
void NCursesUI::set_input_callback(InputCallback callback)
{
m_input_callback = std::move(callback);
}
void NCursesUI::abort()
{
endwin();
}
}
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