108 lines
2.4 KiB
PHP
108 lines
2.4 KiB
PHP
<?php declare(strict_types=1);
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namespace Aviat\Kilo;
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use FFI;
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use FFI\CData;
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use Aviat\Kilo\Enum\C;
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/**
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* An implicit singleton wrapper around terminal settings to simplify enabling/disabling raw mode
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*/
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class Termios {
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private CData $originalTermios;
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private function __construct()
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{
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$ffi = get_ffi();
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$termios = $ffi->new('struct termios');
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if ($termios === NULL)
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{
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throw new TermiosException('Failed to create termios struct');
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}
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$termiosAddr = FFI::addr($termios);
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$res = $ffi->tcgetattr(C::STDIN_FILENO, $termiosAddr);
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if ($res === -1)
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{
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throw new TermiosException('Failed to get existing terminal settings');
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}
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$this->originalTermios = $termios;
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}
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/**
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* Put the current terminal into raw input mode
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*
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* Returns TRUE if successful. Will return NULL if run more than once, as
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* raw mode is pretty binary...there's no point in reapplying raw mode!
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*
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* @return bool|null
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*/
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public static function enableRawMode(): ?bool
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{
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static $run = FALSE;
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// Don't run this more than once!
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if ($run === TRUE)
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{
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return NULL;
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}
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$run = TRUE;
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$instance = self::getInstance();
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// Make sure to restore normal mode on exit/die/crash
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register_shutdown_function([static::class, 'disableRawMode']);
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$termios = clone $instance->originalTermios;
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$termios->c_iflag &= ~(C::BRKINT | C::ICRNL | C::INPCK | C::ISTRIP | C::IXON);
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$termios->c_oflag &= ~(C::OPOST);
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$termios->c_cflag |= (C::CS8);
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$termios->c_lflag &= ~( C::ECHO | C::ICANON | C::IEXTEN | C::ISIG );
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$termios->c_cc[C::VMIN] = 0;
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$termios->c_cc[C::VTIME] = 1;
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// Turn on raw mode
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$res = get_ffi()->tcsetattr(C::STDIN_FILENO, C::TCSAFLUSH, FFI::addr($termios));
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return $res !== -1;
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}
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/**
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* Restores terminal settings that were changed when going into raw mode.
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*
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* Returns TRUE if settings are applied successfully. If raw mode was not
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* enabled, this will output a line of escape codes and a new line.
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*
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* @return bool
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*/
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public static function disableRawMode(): bool
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{
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$instance = self::getInstance();
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// Cleanup
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write_stdout(ANSI::CLEAR_SCREEN);
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write_stdout(ANSI::RESET_CURSOR);
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write_stdout("\n"); // New line, please
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$res = get_ffi()->tcsetattr(C::STDIN_FILENO, C::TCSAFLUSH, FFI::addr($instance->originalTermios));
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return $res !== -1;
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}
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private static function getInstance(): self
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{
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static $instance;
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if ($instance === NULL)
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{
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$instance = new self();
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}
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return $instance;
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}
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} |