1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
//
// lager - library for functional interactive c++ programs
// Copyright (C) 2017 Juan Pedro Bolivar Puente
//
// This file is part of lager.
//
// lager is free software: you can redistribute it and/or modify
// it under the terms of the MIT License, as detailed in the LICENSE
// file located at the root of this source code distribution,
// or here: <https://github.com/arximboldi/lager/blob/master/LICENSE>
//
#include "terminal.hpp"
#include <boost/asio/read.hpp>
#include <iostream>
using namespace std::placeholders;
using namespace std::string_literals;
namespace ncurses {
terminal::terminal(boost::asio::io_context& serv)
: win_{[] {
std::locale::global(std::locale(""));
::setlocale(LC_ALL, "");
return ::initscr();
}()}
, input_{serv, ::dup(STDIN_FILENO)}
, signal_{serv, SIGWINCH}
{
if (win_.get() != ::stdscr)
throw std::runtime_error{"error while initializing ncurses"};
::raw();
::noecho();
::keypad(stdscr, true);
::nodelay(stdscr, true);
::start_color();
::use_default_colors();
}
coord terminal::size()
{
int maxrow, maxcol;
getmaxyx(stdscr, maxrow, maxcol);
return {maxrow, maxcol};
}
void terminal::start(event_handler ev)
{
assert(!handler_);
handler_ = std::move(ev);
next_key_();
next_resize_();
}
void terminal::stop()
{
input_.cancel();
signal_.cancel();
handler_ = {};
}
void terminal::next_resize_()
{
signal_.async_wait([this](auto ec, auto) {
if (!ec) {
next_resize_();
auto ws = ::winsize{};
if (::ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1)
::perror("TIOCGWINSZ");
else {
::resizeterm(ws.ws_row, ws.ws_col);
handler_(resize_event{{ws.ws_row, ws.ws_col}});
}
}
});
}
void terminal::next_key_()
{
using namespace boost::asio;
input_.async_read_some(null_buffers(), [&](auto ec, auto) {
if (!ec) {
auto key = wint_t{};
auto res = int{};
while (ERR != (res = ::wget_wch(win_.get(), &key))) {
next_key_();
handler_(key_event{{res, key}});
}
}
});
}
void terminal::cleanup_fn::operator()(WINDOW* win) const
{
if (win) {
// consume all remaining characters from the terminal so they
// don't leak in the bash prompt after quitting, then restore
// the terminal state
auto key = wint_t{};
while (::get_wch(&key) != ERR)
;
::endwin();
}
}
} // namespace ncurses
|
