composer/plugin/docker4drupal#33 Better handling of git ignore

BaseHandler.php

@@ -47,6 +47,11 @@ abstract class BaseHandler implements BaseHandlerInterface {
    */
   protected $drupalCorePackage;
 
+  /**
+   * @var string[]
+   */
+  protected $ignoredGitPatterns;
+
   /**
    * Handler constructor.
    *
@@ -129,4 +134,25 @@ abstract class BaseHandler implements BaseHandlerInterface {
     passthru(escapeshellcmd('git -c "user.email=composer@lakedrops.com" ' . $command));
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function gitIgnore($pattern) {
+    if ($this->ignoredGitPatterns === NULL) {
+      if (file_exists('.gitignore')) {
+        $this->ignoredGitPatterns = explode(PHP_EOL, file_get_contents('.gitignore'));
+      }
+      else {
+        $this->ignoredGitPatterns = [];
+      }
+    }
+
+    if (\in_array($pattern, $this->ignoredGitPatterns, TRUE)) {
+      return;
+    }
+
+    $this->ignoredGitPatterns[] = $pattern;
+    $this->git('ignore ' . $pattern);
+  }
+
 }

BaseHandlerInterface.php

@@ -66,4 +66,12 @@ interface BaseHandlerInterface {
    */
   public function git($command);
 
+  /**
+   * Add the given pattern to gitignore if necessary.
+   *
+   * @param string $pattern
+   *   The pattern which should be ignored.
+   */
+  public function gitIgnore($pattern);
+
 }