feat(formatter): added support for symphony forms

closes #476

src/djlint/settings.py

@@ -537,13 +537,15 @@ def __init__(
                 ("""
             + self.indent_template_tags
             + r"""
-            )"""
+            ) | \{{-?[ ]*?form_start
+            """
         )
 
         self.template_unindent: str = r"""
                 (?:
                   (?:\{\{\/)
                 | (?:\{%-?[ ]*?end(?!comment))
+                | (?:\{{-?[ ]*?form_end)
               )
             """
 

tests/test_twig/test_symfony.py

@@ -0,0 +1,39 @@
+"""Test twig symfony form tags.
+
+poetry run pytest tests/test_twig/test_symfony.py
+"""
+import pytest
+
+from src.djlint.reformat import formatter
+from tests.conftest import printer
+
+test_data = [
+    pytest.param(
+        (
+            "{{ form_start(form) }}\n"
+            "        {{ form_widget(form) }}\n"
+            "\n"
+            '        <button type="submit" class="btn btn-primary">\n'
+            '            <i class="fa fa-save" aria-hidden="true"></i> {{ \'action.save\'|trans }}\n'
+            "        </button>\n"
+            "    {{ form_end(form) }}"
+        ),
+        (
+            "{{ form_start(form) }}\n"
+            "    {{ form_widget(form) }}\n"
+            '    <button type="submit" class="btn btn-primary">\n'
+            '        <i class="fa fa-save" aria-hidden="true"></i> {{ \'action.save\'|trans }}\n'
+            "    </button>\n"
+            "{{ form_end(form) }}\n"
+        ),
+        id="comments",
+    ),
+]
+
+
+@pytest.mark.parametrize(("source", "expected"), test_data)
+def test_base(source, expected, nunjucks_config):
+    output = formatter(nunjucks_config, source)
+
+    printer(expected, source, output)
+    assert expected == output