// mcpp.platform.terminal — terminal capability detection.

//

// Provides:

// is_tty() — whether stdout is a terminal

// terminal_cols() — terminal width in columns

module;

#include <cstdio>

#include <cstdlib>

#ifdef __unix__

#include <unistd.h>

#include <sys/ioctl.h>

#endif

export module mcpp.platform.terminal;

import std;

export namespace mcpp::platform::terminal {

// Returns true if stdout is connected to a terminal (TTY).

bool is_tty();

// Returns the terminal width in columns. Tries TIOCGWINSZ on Unix,

// falls back to $COLUMNS, then defaults to 80.

std::size_t cols();

} // namespace mcpp::platform::terminal

namespace mcpp::platform::terminal {

bool is_tty() {

#ifdef __unix__

return ::isatty(::fileno(stdout)) != 0;

#else

return false;

#endif

}

std::size_t cols() {

#ifdef __unix__

struct winsize w{};

if (::ioctl(::fileno(stdout), TIOCGWINSZ, &w) == 0 && w.ws_col > 0)

return w.ws_col;

#endif

if (auto* e = std::getenv("COLUMNS"); e && *e) {

try { auto n = std::stoul(e); if (n > 0) return n; } catch (...) {}

}

return 80;

}

} // namespace mcpp::platform::terminal