diff --git a/src/Action/Action.php b/src/Action/Action.php
index ce682b0..6db1086 100644
--- a/src/Action/Action.php
+++ b/src/Action/Action.php
@@ -45,4 +45,17 @@ private function isEnabled(ActionConfig $action): bool
     {
         return $action->getOptions()->get('enabled', true);
     }
+
+    public function getChangedFiles(Config\Action $action, Repository $repository): array
+    {
+        $excludedFiles = $action->getOptions()->get('excluded_files');
+        $extensions = $action->getOptions()->get('extensions', ['php', 'twig']);
+
+        $changedFiles = [];
+        foreach ($extensions as $extension) {
+            $changedFiles = [...$changedFiles, ...$repository->getIndexOperator()->getStagedFilesOfType($extension)];
+        }
+
+        return array_diff($changedFiles, $excludedFiles);
+    }
 }
diff --git a/src/Action/CheckForTabs.php b/src/Action/CheckForTabs.php
new file mode 100644
index 0000000..c9669c9
--- /dev/null
+++ b/src/Action/CheckForTabs.php
@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Netgen\GitHooks\Action;
+
+use CaptainHook\App\Config;
+use CaptainHook\App\Console\IO;
+use SebastianFeldmann\Git\Repository;
+use Symfony\Component\Process\Process;
+use function array_diff;
+use function implode;
+
+final class CheckForTabs extends Action
+{
+    protected const ERROR_MESSAGE = 'You have tabs in your code!';
+
+    protected function doExecute(Config $config, IO $io, Repository $repository, Config\Action $action): void
+    {
+        $files = $this->getChangedFiles($action, $repository);
+        if (empty($files)) {
+            return;
+        }
+
+        $arguments = array_merge(
+            [
+                'grep',
+                '$\t',
+            ],
+            $files
+        );
+
+        $process = new Process($arguments);
+
+        $process->run();
+        $process->wait();
+
+        if ($process->getOutput()) {
+            $io->writeError("<error>{$process->getOutput()}</error>");
+            $this->throwError($action, $io);
+        }
+    }
+}
diff --git a/src/Action/CheckForWhiteSpaceAtEOL.php b/src/Action/CheckForWhiteSpaceAtEOL.php
new file mode 100644
index 0000000..92c2458
--- /dev/null
+++ b/src/Action/CheckForWhiteSpaceAtEOL.php
@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Netgen\GitHooks\Action;
+
+use CaptainHook\App\Config;
+use CaptainHook\App\Console\IO;
+use SebastianFeldmann\Git\Repository;
+use Symfony\Component\Process\Process;
+use function array_diff;
+use function implode;
+
+final class CheckForWhiteSpaceAtEOL extends Action
+{
+    protected const ERROR_MESSAGE = 'You have white spaces at EOL!';
+
+    protected function doExecute(Config $config, IO $io, Repository $repository, Config\Action $action): void
+    {
+        $files = $this->getChangedFiles($action, $repository);
+        if (empty($files)) {
+            return;
+        }
+
+        $arguments = array_merge(
+            [
+                'grep',
+                '[[:blank:]]$',
+            ],
+            $files
+        );
+
+        $process = new Process($arguments);
+
+        $process->run();
+        $process->wait();
+
+        if ($process->getOutput()) {
+            $io->writeError("<error>{$process->getOutput()}</error>");
+            $this->throwError($action, $io);
+        }
+    }
+}