Don't overwrite externally changed msg file

If cli actions are used to change the commit message file the
after action did overwrite those changes with the "original"
commit message again making sure that all changes were lost.

Now the afterAction only overwrites the msg file with the message
object if a php action was executed.

Author: sebastianfeldmann

src/Runner/Hook/PrepareCommitMsg.php

@@ -14,6 +14,7 @@
 use CaptainHook\App\Config;
 use CaptainHook\App\Hooks;
 use CaptainHook\App\Runner\Hook;
+use CaptainHook\App\Runner\Util;
 use RuntimeException;
 use SebastianFeldmann\Git;
 
@@ -35,30 +36,30 @@ class PrepareCommitMsg extends Hook
     protected $hook = Hooks::PREPARE_COMMIT_MSG;
 
     /**
-     * @var string
+     * @var string|null
      */
-    private $commentChar;
+    private ?string $commentChar;
 
     /**
      * Path to commit message file
      *
      * @var string
      */
-    private $file;
+    private string $file;
 
     /**
      * Commit mode, empty or [message|template|merge|squash|commit]
      *
      * @var string
      */
-    private $mode;
+    private string $mode;
 
     /**
      * Commit hash if mode is commit during -c or --amend
      *
      * @var string
      */
-    private $hash;
+    private string $hash;
 
     /**
      * Fetch the original hook arguments and message related config settings
@@ -99,7 +100,11 @@ public function beforeAction(Config\Action $action): void
      */
     public function afterAction(Config\Action $action): void
     {
-        file_put_contents($this->file, $this->repository->getCommitMsg()->getRawContent());
+        // only write the commit message to disk if a php action was executed
+        // and potentially changed the message object
+        if (Util::getExecType($action->getAction()) !== 'cli') {
+            file_put_contents($this->file, $this->repository->getCommitMsg()->getRawContent());
+        }
         parent::afterAction($action);
     }
 }