display

Layout and Rendering TUI library
git clone git://git.dimitrijedobrota.com/display.git
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commit f025ceaf680e36c28cef477714c94ee94e52f48f
parent a218da041827f634ceb1315a75c8547320388d0c
author Dimitrije Dobrota < mail@dimitrijedobrota.com >
date Sat, 1 Feb 2025 21:27:43 +0100

Enter and exit raw mode

Diffstat:
M example/example.cpp | ++ -
M include/display/display.hpp | +++++ ----
M source/display.cpp | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ----

3 files changed, 76 insertions(+), 9 deletions(-)

diff --git a/ example/example.cpp b/ example/example.cpp

@@ -6,7 +6,8 @@ int main()

{
display::start();

(void)std::getchar();
while (true) {
}

display::stop();

diff --git a/ include/display/display.hpp b/ include/display/display.hpp

@@ -1,11 +1,12 @@

#pragma once

#include "display/display_export.hpp"

namespace display
{

void start();
void stop();
using exit_f = void();

void exit();
void start(exit_f f_exit = exit);
void stop(bool force = false);

} // namespace display

diff --git a/ source/display.cpp b/ source/display.cpp

@@ -1,20 +1,85 @@

#include <iostream>
#include <stdexcept>

#include "display/display.hpp"

#include <alec/alec.hpp>
#include <termios.h>
#include <unistd.h>

namespace
{

template<const char* Val>
inline void write()
{
::write(STDIN_FILENO, Val, sizeof(Val));
}

} // namespace

namespace display
{

void start()
static int start_count = 0; // NOLINT
static struct termios orig_termios; // NOLINT

void exit()
{
std::cout << alec::abuf_enable_v << alec::cursor_hide_v;
stop(/* force= */ true);
}

void stop()
void start(exit_f f_exit)
{
std::cout << alec::abuf_disable_v;
if (start_count++ > 0) {
// already started
return;
}

if (isatty(STDIN_FILENO) == 0) {
throw std::runtime_error("STDIN_FILENO is not associated with a terminal");
}

if (atexit(f_exit) != 0) {
throw std::runtime_error("Can't register new exit function");
}

if (tcgetattr(STDIN_FILENO, &orig_termios) == -1) {
throw std::runtime_error("Can't read termios");
}

struct termios raw = orig_termios;

// NOLINTBEGIN
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
raw.c_oflag &= ~(OPOST);
raw.c_cflag |= (CS8);
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN); // | ISIG
raw.c_cc[VMIN] = 0;
raw.c_cc[VTIME] = 1;
// NOLINTEND

/* put terminal in raw mode after flushing */
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) < 0) {
throw std::runtime_error("Can't write termios");
}

write<alec::abuf_enable_v>();
write<alec::cursor_hide_v>();
}

void stop(bool force)
{
if (!force && --start_count > 0) {
// still need to keep open
return;
}

if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) < 0) {
throw std::runtime_error("Can't write termios");
}

write<alec::cursor_show_v>();
}

} // namespace display