Parse commit log with loophp/collection

parse-commit-log.php

<?php

declare(strict_types=1);

include 'vendor/autoload.php';

use loophp\collection\Collection;
use loophp\collection\Contract\Operation\Sortable;

$commandStream = static function (string $command): Generator {
    $fh = \popen($command, 'r');

    while (false !== $line = fgets($fh)) {
        yield $line;
    }

    \fclose($fh);
};

$c = Collection::fromIterable($commandStream('git log'))
    ->compact('', "\n")
    ->map(
        static function (string $value): string {
            return trim($value);
        }
    )
    ->associate(
        static function (int $key, string $value) use (&$lastCommitId): string {
            if (strpos($value, 'commit ') === 0) {
                [, $commitId] = explode('commit ', $value, 2);

                $lastCommitId = $commitId;
            }

            return $lastCommitId;
        }
    )
    ->group()
    ->map(
        static function (array $values, string $commitId): array {
            $callbackFilter = static function ($value): bool
            {
                return 1 !== preg_match('/^commit \b[0-9a-f]{5,40}\b/', $value);
            };

            $callbackMap1 = static function($value, $key) {
                $modifiers = [
                    'Signed-off-by',
                    'Date',
                    'Author'
                ];

                $delimiter = ':';

                foreach ($modifiers as $modifier) {
                    $searchItemWithColumn = sprintf('%s%s', $modifier, $delimiter);

                    if (strpos($value, $searchItemWithColumn) === 0) {
                        [,$data] = explode($searchItemWithColumn, $value, 2);

                        return [
                            strtolower($modifier) => trim($data),
                        ];
                    }
                }

                return $value;
            };

            $callbackMap2 = static function ($value) {
                return is_string($value) ?
                    ['log' => $value] :
                    $value;
            };

            $callbackMap3 = static function ($value): string {
                return is_array($value) ?
                    implode(PHP_EOL, $value):
                    $value;
            };

            return Collection::fromIterable($values)
                ->filter($callbackFilter)
                ->map($callbackMap1)
                ->map($callbackMap2)
                ->unwrap()
                ->group()
                ->map($callbackMap3)
                ->merge(['commit' => $commitId])
                ->sort(Sortable::BY_KEYS)
                ->all();
        }
    )
    ->normalize()
    ->limit(20);

print_r($c->all());

/**
Array
(
    [0] => Array
        (
            [author] => Pol Dellaiera <[email protected]>
            [commit] => 81c7681622040f3cb4bce207e4489010f40e13c7
            [date] => Sun Aug 16 19:11:18 2020 +0200
            [log] => WIP
        )

    [1] => Array
        (
            [author] => Pol Dellaiera <[email protected]>
            [commit] => e716b854527e576d3e9f76455d0f5f8dfe20bf17
            [date] => Sun Aug 16 16:12:53 2020 +0200
            [log] => Update typing information.
        )

    ...

    [18] => Array
        (
            [author] => Pol Dellaiera <[email protected]>
            [commit] => 940fcec1d86d7296d7c87017755e0f6b09a67802
            [date] => Thu Aug 6 23:37:41 2020 +0200
            [log] => Update documentation.
        )

    [19] => Array
        (
            [author] => Pol Dellaiera <[email protected]>
            [commit] => 54d2559e2af97a33c7600ab2e8e0bae76ea7a64a
            [date] => Thu Aug 6 22:36:07 2020 +0200
            [log] => Add docker stack for building documentation locally.
        )
)
**/