Show Git Info in PHP

           <?php
 namespace App;
 
 use Carbon\Carbon;
 
 class Version
 {
     public readonly ?string $commit;
 
     public readonly ?string $commit_short;
 
     public readonly ?string $tag;
 
     public readonly ?Carbon $date;
 
     protected static array $instances = [];
     
     public function __construct(?string $commit = null, ?string $tag = null, ?Carbon $date = null)
     {
         $this->commit = $commit ?? static::getCurrentGitCommitHash();
         $this->commit_short = substr($this->commit, 0, 7);
         $this->tag = $this->tag();
         $this->date = $this->date();
     }
 
     public static function make(?string $commit = null, ?string $tag = null, ?Carbon $date = null): self
     {
         if(! isset(static::$instances[$commit])) {
             static::$instances[$commit] = new static($commit);
         }
 
         return static::$instances[$commit];
     }
 
     public function toArray(): array
     {
         return [
             'commit' => $this->commit,
             'commit_short' => $this->commit_short,
             'tag' => $this->tag,
             'label' => $this->label(),
             'date' => $this->date,
         ];
     }
 
     protected function hasTag(): bool
     {
         return $this->tag !== null;
     }
 
     protected function label(): string
     {
         if(! $this->hasTag()) {
             return $this->commit_short;
         }
 
         return str_starts_with($this->tag, 'v')
             ? "{$this->tag} ({$this->commit_short})"
             : "v{$this->tag} ({$this->commit_short})";
     }
 
     protected static function getCurrentGitCommitHash(): ?string
     {
         $path = base_path('.git/');
     
         if (! file_exists($path)) {
             return null;
         }
     
         $head = trim(substr(file_get_contents($path . 'HEAD'), 4));
     
         $hash = trim(file_get_contents(sprintf($path . $head)));
     
         return $hash;
     }
 
     protected function tag(): ?string
     {
         $tag = exec('git tag --contains ' . $this->commit);
 
         return $tag === '' ? null : $tag;
     }
 
     public function date(): ?Carbon
     {
         $date = exec('git show -s --format=%ci ' . $this->commit);
         
         return $date === '' ? null : Carbon::parse($date);
     }
 }