refactor: Remove django-taggit and replace it with a local tags setup

archivebox/core/forms.py

@@ -3,6 +3,7 @@ __package__ = 'archivebox.core'
 from django import forms
 
 from ..util import URL_REGEX
+from .utils_taggit import edit_string_for_tags, parse_tags
 
 CHOICES = (
     ('0', 'depth = 0 (archive just these URLs)'),
@@ -12,3 +13,44 @@ CHOICES = (
 class AddLinkForm(forms.Form):
     url = forms.RegexField(label="URLs (one per line)", regex=URL_REGEX, min_length='6', strip=True, widget=forms.Textarea, required=True)
     depth = forms.ChoiceField(label="Archive depth", choices=CHOICES, widget=forms.RadioSelect, initial='0')
+
+
+class TagWidgetMixin:
+    def format_value(self, value):
+        if value is not None and not isinstance(value, str):
+            value = edit_string_for_tags(value)
+        return super().format_value(value)
+
+class TagWidget(TagWidgetMixin, forms.TextInput):
+    pass
+
+class TagField(forms.CharField):
+    widget = TagWidget
+
+    def clean(self, value):
+        value = super().clean(value)
+        try:
+            return parse_tags(value)
+        except ValueError:
+            raise forms.ValidationError(
+                "Please provide a comma-separated list of tags."
+            )
+
+    def has_changed(self, initial_value, data_value):
+        # Always return False if the field is disabled since self.bound_data
+        # always uses the initial value in this case.
+        if self.disabled:
+            return False
+
+        try:
+            data_value = self.clean(data_value)
+        except forms.ValidationError:
+            pass
+
+        if initial_value is None:
+            initial_value = []
+
+        initial_value = [tag.name for tag in initial_value]
+        initial_value.sort()
+
+        return initial_value != data_value