Use correct direction for RTL content

src-ui/src/app/components/document-detail/document-detail.component.html

@@ -91,7 +91,7 @@
                     <a ngbNavLink i18n>Content</a>
                     <ng-template ngbNavContent>
                         <div class="mb-3">
-                            <textarea class="form-control" id="content" rows="20" formControlName='content'></textarea>
+                            <textarea class="form-control" id="content" rows="20" formControlName='content' [class.rtl]="isRTL"></textarea>
                         </div>
                     </ng-template>
                 </li>

src-ui/src/app/components/document-detail/document-detail.component.scss

@@ -28,3 +28,7 @@
   left: 30%;
   right: 30%;
 }
+
+textarea.rtl {
+  direction: rtl;
+}

src-ui/src/app/components/document-detail/document-detail.component.ts

@@ -135,6 +135,13 @@ export class DocumentDetailComponent
       : this.metadata?.original_mime_type
   }
 
+  get isRTL() {
+    if (!this.metadata || !this.metadata.lang) return false
+    else {
+      return ['ar', 'he', 'fe'].includes(this.metadata.lang)
+    }
+  }
+
   ngOnInit(): void {
     this.documentForm.valueChanges
       .pipe(takeUntil(this.unsubscribeNotifier))

src-ui/src/app/data/paperless-document-metadata.ts

@@ -10,4 +10,6 @@ export interface PaperlessDocumentMetadata {
   original_filename?: string
 
   has_archive_version?: boolean
+
+  lang?: string
 }

src/documents/views.py

@@ -29,6 +29,7 @@ from django.views.decorators.cache import cache_control
 from django.views.generic import TemplateView
 from django_filters.rest_framework import DjangoFilterBackend
 from documents.tasks import consume_file
+from langdetect import detect
 from packaging import version as packaging_version
 from paperless import version
 from paperless.db import GnuPG
@@ -325,6 +326,13 @@ class DocumentViewSet(
             "original_filename": doc.original_filename,
         }
 
+        lang = "en"
+        try:
+            lang = detect(doc.content)
+        except Exception:
+            pass
+        meta["lang"] = lang
+
         if doc.has_archive_version:
             meta["archive_size"] = self.get_filesize(doc.archive_path)
             meta["archive_metadata"] = self.get_metadata(