smuuf/primi

<?php

declare(strict_types=1);

namespace Smuuf\Primi\Drivers;

use \Smuuf\StrictObject;
use \Smuuf\Primi\Cli\Term;

class TerminalIoDriver implements StdIoDriverInterface {

    use StrictObject;

    private ?string $buffer = null;

    private function bufferInput(?string $buffer): void {
        $this->buffer = (string) $buffer;
    }

    public function input(string $prompt): string {

        // Using a bit more complex logic instead of just calling readline().
        // That's because with readline() any multiline entries browsed for via
        // the readline history (up arrow) wouldn't be returned in full for
        // some reason (only its last line).

        // Register callback that will be called for every entered line
        // (that is, after the user presses enter).
        \readline_callback_handler_install($prompt, [$this, 'bufferInput']);

        while (\true) {

            // Wait for a single character input.
            \readline_callback_read_char();

            // After the user presses enter, buffer will be (even empty) string,
            // so at that point we know we got the full input we want to return.
            if ($this->buffer !== \null) {
                break;
            }

        }

        \readline_callback_handler_remove();
        $buffer = $this->buffer;
        $this->buffer = \null;

        return $buffer;

    }

    public function stdout(string ...$text): void {
        echo \implode('', $text);
    }

    public function stderr(string ...$text): void {
        Term::stderr(\implode('', $text));
    }

}