Added option for default settings.

.gitignore

@@ -127,3 +127,6 @@ dmypy.json
 
 # Pyre type checker
 .pyre/
+
+# PyCharm
+.idea/

src/django_nh3/forms.py

@@ -7,6 +7,8 @@
 from django import forms
 from django.utils.safestring import mark_safe
 
+from src.django_nh3.utils import get_nh3_update_options
+
 
 class Nh3Field(forms.CharField):
     """nh3 form field"""
@@ -15,27 +17,27 @@ class Nh3Field(forms.CharField):
 
     def __init__(
         self,
-        attributes: dict[str, set[str]] = {},
+        attributes: dict[str, set[str]] | None = None,
         attribute_filter: Callable[[str, str, str], str] | None = None,
-        clean_content_tags: set[str] = set(),
+        clean_content_tags: set[str] | None = None,
         empty_value: Any | None = None,
         link_rel: str = "",
         strip_comments: bool = False,
-        tags: set[str] = set(),
+        tags: set[str] | None = None,
         *args: Any,
         **kwargs: dict[Any, Any],
     ):
         super().__init__(*args, **kwargs)
 
         self.empty_value = empty_value
-        self.nh3_options = {
-            "attributes": attributes,
-            "attribute_filter": attribute_filter,
-            "clean_content_tags": clean_content_tags,
-            "link_rel": link_rel,
-            "strip_comments": strip_comments,
-            "tags": tags,
-        }
+        self.nh3_options = get_nh3_update_options(
+            attributes=attributes,
+            attribute_filter=attribute_filter,
+            clean_content_tags=clean_content_tags,
+            link_rel=link_rel,
+            strip_comments=strip_comments,
+            tags=tags,
+        )
 
     def to_python(self, value: Any) -> Any:
         """

src/django_nh3/models.py

@@ -11,30 +11,31 @@
 from django.utils.safestring import mark_safe
 
 from . import forms
+from .utils import get_nh3_update_options
 
 
 class Nh3Field(models.TextField):
     def __init__(
         self,
-        attributes: dict[str, set[str]] = {},
+        attributes: dict[str, set[str]] | None = None,
         attribute_filter: Callable[[str, str, str], str] | None = None,
-        clean_content_tags: set[str] = set(),
+        clean_content_tags: set[str] | None = None,
         link_rel: str = "",
         strip_comments: bool = False,
-        tags: set[str] = set(),
+        tags: set[str] | None = None,
         *args: Any,
         **kwargs: Any,
     ) -> None:
         super().__init__(*args, **kwargs)
 
-        self.nh3_options = {
-            "attributes": attributes,
-            "attribute_filter": attribute_filter,
-            "clean_content_tags": clean_content_tags,
-            "link_rel": link_rel,
-            "strip_comments": strip_comments,
-            "tags": tags,
-        }
+        self.nh3_options = get_nh3_update_options(
+            attributes=attributes,
+            attribute_filter=attribute_filter,
+            clean_content_tags=clean_content_tags,
+            link_rel=link_rel,
+            strip_comments=strip_comments,
+            tags=tags,
+        )
 
     def formfield(
         self, form_class: FormField = forms.Nh3Field, **kwargs: Any

src/django_nh3/utils.py

@@ -1,4 +1,5 @@
 import logging
+from collections.abc import Callable
 from typing import Any
 
 from django.conf import settings
@@ -48,3 +49,34 @@ def get_nh3_default_options() -> dict[str, Any]:
             nh3_args[kwarg] = attr
 
     return nh3_args
+
+
+def get_nh3_update_options(
+    attributes: dict[str, set[str]] | None = None,
+    attribute_filter: Callable[[str, str, str], str] | None = None,
+    clean_content_tags: set[str] | None = None,
+    link_rel: str = "",
+    strip_comments: bool = False,
+    tags: set[str] | None = None,
+) -> dict[str, Any]:
+    _attributes = attributes or getattr(settings, "NH3_ALLOWED_ATTRIBUTES", {})
+    _attribute_filter = attribute_filter or getattr(
+        settings, "NH3_ALLOWED_ATTRIBUTES_FILTER", None
+    )
+    _clean_content_tags = (
+        clean_content_tags or getattr(settings, "NH3_CLEAN_CONTENT_TAGS", None) or set()
+    )
+    _link_rel = link_rel or getattr(settings, "NH3_CLEAN_CONTENT_TAGS", "")
+    _strip_comments = strip_comments or getattr(settings, "NH3_STRIP_COMMENTS", False)
+    _tags = tags or getattr(settings, "NH3_ALLOWED_TAGS", None) or set()
+
+    nh3_args = {
+        "attributes": {tag: set(attributes) for tag, attributes in _attributes.items()},
+        "attribute_filter": _attribute_filter,
+        "clean_content_tags": set(_clean_content_tags),
+        "link_rel": _link_rel,
+        "strip_comments": _strip_comments,
+        "tags": set(_tags),
+    }
+
+    return nh3_args