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kakoune/src/ncurses.cc

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#include "ncurses.hh"
#include "window.hh"
#include "register_manager.hh"
#include <ncurses.h>
#include <map>
#define CTRL(x) x - 'a' + 1
namespace Kakoune
{
NCursesUI::NCursesUI()
{
// setlocale(LC_ALL, "");
initscr();
cbreak();
noecho();
nonl();
intrflush(stdscr, false);
keypad(stdscr, true);
curs_set(0);
start_color();
use_default_colors();
ESCDELAY=25;
}
NCursesUI::~NCursesUI()
{
endwin();
}
static void set_attribute(int attribute, bool on)
{
if (on)
attron(attribute);
else
attroff(attribute);
}
static int nc_color(Color color)
{
switch (color)
{
case Color::Black: return COLOR_BLACK;
case Color::Red: return COLOR_RED;
case Color::Green: return COLOR_GREEN;
case Color::Yellow: return COLOR_YELLOW;
case Color::Blue: return COLOR_BLUE;
case Color::Magenta: return COLOR_MAGENTA;
case Color::Cyan: return COLOR_CYAN;
case Color::White: return COLOR_WHITE;
case Color::Default:
default:
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return -1;
}
}
static void set_color(Color fg_color, Color bg_color)
{
static std::map<std::pair<Color, Color>, int> colorpairs;
static int current_pair = -1;
static int next_pair = 1;
if (current_pair != -1)
attroff(COLOR_PAIR(current_pair));
if (fg_color == Color::Default and bg_color == Color::Default)
return;
std::pair<Color, Color> colorpair(fg_color, bg_color);
auto it = colorpairs.find(colorpair);
if (it != colorpairs.end())
{
current_pair = it->second;
attron(COLOR_PAIR(it->second));
}
else
{
init_pair(next_pair, nc_color(fg_color), nc_color(bg_color));
colorpairs[colorpair] = next_pair;
current_pair = next_pair;
attron(COLOR_PAIR(next_pair));
++next_pair;
}
}
void NCursesUI::draw_window(Window& window)
{
int max_x,max_y;
getmaxyx(stdscr, max_y, max_x);
max_y -= 1;
window.set_dimensions(DisplayCoord(max_y, max_x));
window.update_display_buffer();
DisplayCoord position;
for (const DisplayAtom& atom : window.display_buffer())
{
assert(position == atom.coord());
const String content = atom.content();
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(atom.fg_color(), atom.bg_color());
auto pos = content.begin();
while (true)
{
move(position.line, position.column);
clrtoeol();
auto end = std::find(pos, content.end(), '\n');
String line(pos, end);
addstr(line.c_str());
if (end != content.end())
{
addch(' ');
position.line = position.line + 1;
position.column = 0;
pos = end + 1;
if (position.line >= max_y)
break;
}
else
{
position.column += line.length();
break;
}
}
if (position.line >= max_y)
break;
}
set_attribute(A_UNDERLINE, 0);
set_attribute(A_REVERSE, 0);
set_attribute(A_BLINK, 0);
set_attribute(A_BOLD, 0);
set_color(Color::Blue, Color::Black);
while (++position.line < max_y)
{
move(position.line, 0);
clrtoeol();
addch('~');
}
set_color(Color::Cyan, Color::Black);
String status_line = window.status_line();
static int last_status_length = 0;
move(max_y, max_x - last_status_length);
clrtoeol();
move(max_y, max_x - status_line.length());
addstr(status_line.c_str());
last_status_length = status_line.length();
}
Key NCursesUI::get_key()
{
char c = getch();
Key::Modifiers modifiers = Key::Modifiers::None;
if (c > 0 and c < 27)
{
modifiers = Key::Modifiers::Control;
c = c - 1 + 'a';
}
else if (c == 27)
{
timeout(0);
char new_c = getch();
timeout(-1);
if (new_c != ERR)
{
c = new_c;
modifiers = Key::Modifiers::Alt;
}
}
return Key(modifiers, c);
}
String NCursesUI::prompt(const String& text, Completer completer)
{
curs_set(2);
auto restore_cursor = on_scope_end([]() { curs_set(0); });
int max_x, max_y;
getmaxyx(stdscr, max_y, max_x);
move(max_y-1, 0);
addstr(text.c_str());
clrtoeol();
size_t cursor_pos = 0;
Completions completions;
int current_completion = -1;
String text_before_completion;
String result;
String saved_result;
static std::unordered_map<String, std::vector<String>> history_per_prompt;
std::vector<String>& history = history_per_prompt[text];
auto history_it = history.end();
while (true)
{
int c = getch();
switch (c)
{
case '\r':
{
std::vector<String>::iterator it;
while ((it = find(history, result)) != history.end())
history.erase(it);
history.push_back(result);
return result;
}
case KEY_UP:
if (history_it != history.begin())
{
if (history_it == history.end())
saved_result = result;
--history_it;
result = *history_it;
cursor_pos = result.length();
}
break;
case KEY_DOWN:
if (history_it != history.end())
{
++history_it;
if (history_it != history.end())
result = *history_it;
else
result = saved_result;
cursor_pos = result.length();
}
break;
case KEY_LEFT:
if (cursor_pos > 0)
--cursor_pos;
break;
case KEY_RIGHT:
if (cursor_pos < result.length())
++cursor_pos;
break;
case KEY_BACKSPACE:
if (cursor_pos != 0)
{
result = result.substr(0, cursor_pos - 1)
+ result.substr(cursor_pos, String::npos);
--cursor_pos;
}
current_completion = -1;
break;
case CTRL('r'):
{
c = getch();
String reg = RegisterManager::instance()[c].get();
current_completion = -1;
result = result.substr(0, cursor_pos) + reg + result.substr(cursor_pos, String::npos);
cursor_pos += reg.length();
}
break;
case 27:
throw prompt_aborted();
case '\t':
{
if (current_completion == -1)
{
completions = completer(result, cursor_pos);
if (completions.candidates.empty())
break;
text_before_completion = result.substr(completions.start,
completions.end - completions.start);
}
++current_completion;
String completion;
if (current_completion >= completions.candidates.size())
{
if (current_completion == completions.candidates.size() and
std::find(completions.candidates.begin(), completions.candidates.end(), text_before_completion) == completions.candidates.end())
completion = text_before_completion;
else
{
current_completion = 0;
completion = completions.candidates[0];
}
}
else
completion = completions.candidates[current_completion];
move(max_y-1, text.length());
result = result.substr(0, completions.start) + completion;
cursor_pos = completions.start + completion.length();
break;
}
default:
current_completion = -1;
result = result.substr(0, cursor_pos) + (char)c + result.substr(cursor_pos, String::npos);
++cursor_pos;
}
move(max_y - 1, text.length());
clrtoeol();
addstr(result.c_str());
move(max_y - 1, text.length() + cursor_pos);
refresh();
}
return result;
}
void NCursesUI::print_status(const String& status)
{
int x,y;
getmaxyx(stdscr, y, x);
move(y-1, 0);
clrtoeol();
addstr(status.c_str());
}
}