Add version numbers; make app title configurable

src/VersionHelper.php

@@ -0,0 +1,42 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin;
+
+class VersionHelper
+{
+    private string $version;
+
+    public function __construct()
+    {
+        $version = $this->loadFromVersionFile();
+        if (!empty($version)) {
+            $this->version = $version;
+        } elseif ($this->inDevelopmentMode()) {
+            $this->version = '[dev version]';
+        } else {
+            $this->version = '[undefined version]';
+        }
+    }
+
+    public function getAppVersion(): string
+    {
+        return $this->version;
+    }
+
+    private function loadFromVersionFile(): ?string
+    {
+        $versionFilePath = __DIR__ . '/../VERSION';
+
+        if (file_exists($versionFilePath)) {
+            $fileContent = file($versionFilePath);
+            return $fileContent[0] ?? null;
+        }
+        return null;
+    }
+
+    private function inDevelopmentMode(): bool
+    {
+        return getenv('APP_ENV') === 'development';
+    }
+}