minidlna: Minor refactor of media directory handling

Tests performed:

- Functional tests work as expected.

- Updating the media directory works newly updated media directory is show.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/modules/minidlna/__init__.py

@@ -93,3 +93,13 @@ def setup(helper, old_version=None):
     helper.call('post', actions.superuser_run, 'minidlna', ['setup'])
     if not old_version:
         helper.call('post', app.enable)
+
+
+def get_media_dir():
+    """Return the currently set media directory."""
+    return actions.superuser_run('minidlna', ['get-media-dir'])
+
+
+def set_media_dir(media_dir):
+    """Set the media directory from which files will be scanned for sharing."""
+    actions.superuser_run('minidlna', ['set-media-dir', '--dir', media_dir])

plinth/modules/minidlna/views.py

@@ -7,7 +7,7 @@ import os
 from django.contrib import messages
 from django.utils.translation import ugettext_lazy as _
 
-from plinth import actions
+from plinth.modules import minidlna
 from plinth.views import AppView
 
 from .forms import MiniDLNAServerForm
@@ -20,9 +20,7 @@ class MiniDLNAAppView(AppView):
     def get_initial(self):
         """Initial form value as found in the minidlna.conf"""
         initial = super().get_initial()
-        initial.update({
-            'media_dir': actions.superuser_run('minidlna', ['get-media-dir']),
-        })
+        initial.update({'media_dir': minidlna.get_media_dir()})
 
         return initial
 
@@ -36,9 +34,7 @@ class MiniDLNAAppView(AppView):
                 messages.error(self.request,
                                _('Specified directory does not exist.'))
             else:
-                actions.superuser_run(
-                    'minidlna',
-                    ['set-media-dir', '--dir', new_config['media_dir']])
+                minidlna.set_media_dir(new_config['media_dir'])
                 messages.success(self.request, _('Updated media directory'))
 
         return super().form_valid(form)