`Fiber` 命令行加载动画

Fiber 更加方便异步， 比 yield 更加便于理解和操作

• 代码参考

    public function run(Input $input, Output $output): void
    {
        if (strpos(PHP_VERSION, '8.1') !== 0) {
            $output->writeLine('需要 8.1 版本以上!!!');
            return;
        }

        //doSomething
        //光标隐藏/恢复
        $hideCursor = $this->hideCursor();

        $output->write("\033[s");
        $output->write('loading ');

        //加载进度
        $dotLoad = $this->dotLoader();
        $dotLoad->start(1);

        for ($i = 1; $i <= 100; $i++) { 
            # code...
            usleep(100000);
            $dotLoad->resume($i%100);
        }
        $output->writeLine('finished !!!');

        $hideCursor->resume();
    }

    /**
     * 协程加载动画
     *
     * @return \Fiber
     */
    private function dotLoader(): \Fiber
    {
        return new \Fiber(function () {
            $jump = '·';
            $load = ['.', '.', '.', '.', '.', '.', '.', '.','.'];
            echo "\033[32;1m 00% " . implode('', $load) . "\033[0m";
            while(true) {
                for ($i=0; $i < 9; $i++) {
                    $temp = $load;

                    $temp[$i] = $jump;
                    $tmpStr = "\033[32;1m {step}". implode('', $temp) . "\033[0m";
                    $step = \Fiber::suspend();
                    if ( $step === 0) {
                        break 2;
                    } 
                    echo "\033[14D";
                    echo str_replace('{step}', sprintf('%02d%% ', $step), $tmpStr);
                }
            }
            echo "\033[u\033[K";
        });
    }

    /**
     * 协程光标隐藏/恢复
     *
     * @return \Fiber
     */
    private function hideCursor(): \Fiber
    {
        $f = new \Fiber(function () {
            echo "\033[?25l";
            \Fiber::suspend();
            echo "\033[?25h";
        });
        $f->start();
        return $f;
    }