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/*
* Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
* Copyright (C) 2026 Richard Qin
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ricochet/tui/terminal.hh"
#include <cstdlib>
#include <iostream>
#include <sys/ioctl.h>
#include <unistd.h>
namespace ricochet::tui {
Terminal::Terminal()
{
// get terminal attributes
tcgetattr( STDIN_FILENO, &original_termios_ );
struct termios raw = original_termios_;
// close echo, close canonical mode
// close terminal signals (ISIG disable Ctrl+C and Ctrl+Z, let the program handle it)
raw.c_lflag &= ~( ECHO | ICANON | ISIG );
// close software flow control (Ctrl+S, Ctrl+Q)
raw.c_iflag &= ~( IXON | ICRNL );
// apply new terminal attributes
tcsetattr( STDIN_FILENO, TCSAFLUSH, &raw );
}
Terminal::~Terminal()
{
show_cursor( true );
// RAII: restore terminal attributes when program exits
tcsetattr( STDIN_FILENO, TCSAFLUSH, &original_termios_ );
}
char Terminal::read_key() const // NOLINT(readability-convert-member-functions-to-static)
{
char c = '\0';
// read 1 byte
if ( read( STDIN_FILENO, &c, 1 ) == -1 ) {
return '\0';
}
return c;
}
void Terminal::clear_screen() const // NOLINT(readability-convert-member-functions-to-static)
{
// ANSI escape codes: \x1b[2J clear screen, \x1b[H move cursor to (1,1)
std::cout << "\x1b[2J\x1b[H";
}
std::pair<std::size_t, std::size_t> Terminal::get_size() // NOLINT(readability-convert-member-functions-to-static)
const
{
struct winsize w {};
if ( ioctl( STDOUT_FILENO, TIOCGWINSZ, &w ) == -1 ) {
return { 80, 24 };
}
return { static_cast<std::size_t>( w.ws_col ), static_cast<std::size_t>( w.ws_row ) };
}
void Terminal::move_cursor( std::size_t row, std::size_t col ) const // NOLINT
{
// ANSI: \x1b[H move to 1,1; \x1b[row;colH move to specified row and column
std::cout << "\x1b[" << row << ";" << col << "H";
}
void Terminal::show_cursor( bool visible ) const // NOLINT
{
// \x1b[?25h show cursor, \x1b[?25l hide cursor
std::cout << ( visible ? "\x1b[?25h" : "\x1b[?25l" );
}
} // namespace ricochet::tui
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