Working POC scrolling filterable gearman top replacement

gearman_ptop.php

<?php
function _log($msg) {
    file_put_contents('/tmp/log', $msg.PHP_EOL, FILE_APPEND);
}
function getStatus(&$widths, $filter = '') {
    $filter = strtolower($filter);
    _log('Getting status');
    $gearmanStatus = explode("\n",`gearadmin --status`);
    $statusLines = [];
    foreach ($gearmanStatus as $job) {
        if (strpos($job, "\t") === false) {
            continue;
        }
        $splitJob = [];
        list($splitJob['name'], $splitJob['queued'], $splitJob['active'], $splitJob['available']) = explode("\t", trim($job));
        if (strpos(strtolower($splitJob['name']), $filter) === false) {
            continue;
        }
        $statusLines[] = $splitJob;
        foreach ($widths as $columnName => $width) {
            $newWidth = strlen($splitJob[$columnName]);
            if ($newWidth > $width) {
                $widths[$columnName] = $newWidth;
            }
        }
    }
    return $statusLines;
}
termbox_init();
termbox_set_input_mode(TB_INPUT_ESC);

$position = 0;
$ev = null;
$height = termbox_height();
while (true) {
    $widths = [
        'name' => 0,
        'queued' => 5,
        'active' => 5,
        'available' => 5,
    ];
    $filter = '';
    if (isset($argv[1])) {
        $filter = $argv[1];
    }
    $gearmanStatus = getStatus($widths, $filter);
    $totalWidth = array_sum($widths) + 3;
    if ($totalWidth > termbox_width()) {
        unset($widths['name']);
        $widths['name'] = termbox_width() - 3 - array_sum($widths);
    }
    if (isset($ev)) {
        _log('Got event:');
        ob_start();
        var_dump($ev);
        _log(ob_get_clean());
        if ($ev['type'] == TB_EVENT_KEY) {
            $key = termbox_utf8_unicode_to_char($ev['ch']);
            $scrolledToBottom = count($gearmanStatus) <= ($position + termbox_height() + 1);
            $scrolledToTop = $position > 0;
            if ($ev['key'] == TB_KEY_ARROW_UP && $scrolledToTop) {
                $position--;
               _log('Moving up, position is '.$position);
            }elseif ($ev['key'] == TB_KEY_ARROW_DOWN && !$scrolledToBottom) {
                $position++;
               _log('Moving down, position is '.$position);
            }elseif (strtolower($key) == 'q') {
                _log('Exiting');
                break;
            }else{
               _log('Keypressed: '.termbox_utf8_unicode_to_char($ev['ch']));
            }
         } elseif ($ev['type'] == TB_EVENT_RESIZE) {
             $hDiff = $ev['h'] - $height;
             $height = $ev['h'];
             if ($scrolledToBottom) {
                 $position -= $hDiff;
             }
             _log('Height diff: '.str_pad($hDiff, 4));
         }
    }
    termbox_clear();
    $y = 0;
    foreach ($gearmanStatus as $job) {
        $printY = $y - $position;
        if ($printY > termbox_height()) {
            break;
        }
        if ($printY < 0) {
            $y++;
            continue;
        }
        $x = 0;
        termbox_print(str_pad($job['name'], $widths['name']), $x, $printY, TB_DEFAULT, TB_DEFAULT);
        $x += $widths['name'];
        termbox_print(' '.str_pad($job['queued'], $widths['queued']), $x, $printY, TB_DEFAULT, TB_DEFAULT);
        $x += $widths['queued'];
        termbox_print(' '.str_pad($job['active'], $widths['active']), $x, $printY, TB_DEFAULT, TB_DEFAULT);
        $x += $widths['active'];
        termbox_print(' '.str_pad($job['available'], $widths['available']), $x, $printY, TB_DEFAULT, TB_DEFAULT);
        $y++;
    }
    termbox_present();
    $ev = termbox_peek_event(1000);
}
termbox_shutdown();

Requires https://github.com/nsf/termbox, https://github.com/adsr/termbox-php and for adsr/termbox-php#4 to be merged