support borg prune --keep-within, fixes #6

src/vorta/assets/UI/archivetab.ui

@@ -196,6 +196,40 @@
      </item>
     </layout>
    </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,0,1">
+     <item>
+      <widget class="QLabel" name="label_2">
+       <property name="text">
+        <string>No matter what, keep all archives of the last:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLineEdit" name="prune_keep_within">
+       <property name="text">
+        <string/>
+       </property>
+       <property name="placeholderText">
+        <string>24H, 1d, 52w, 12m, 1y</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer_3">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
+   </item>
    <item>
     <widget class="QLabel" name="mountErrors">
      <property name="enabled">

src/vorta/borg/prune.py

@@ -34,6 +34,8 @@ class BorgPruneThread(BorgThread):
             '--keep-yearly', str(profile.prune_year),
             '--prefix', f'{platform.node()}-'
         ]
+        if profile.prune_keep_within:
+            pruning_opts += ['--keep-within', profile.prune_keep_within]
         cmd += pruning_opts
         cmd.append(f'{profile.repo.url}')
 

src/vorta/models.py

@@ -9,7 +9,7 @@ import json
 from datetime import datetime, timedelta
 from playhouse.migrate import SqliteMigrator, migrate
 
-SCHEMA_VERSION = 7
+SCHEMA_VERSION = 8
 
 db = pw.Proxy()
 
@@ -77,6 +77,7 @@ class BackupProfileModel(pw.Model):
     prune_week = pw.IntegerField(default=4)
     prune_month = pw.IntegerField(default=6)
     prune_year = pw.IntegerField(default=2)
+    prune_keep_within = pw.CharField(default='10H', null=True)
 
     def refresh(self):
         return type(self).get(self._pk_expr())
@@ -215,3 +216,9 @@ def init_db(con):
             migrator.drop_column(EventLogModel._meta.table_name, 'profile_id'),
             migrator.add_column(EventLogModel._meta.table_name, 'profile', pw.CharField(null=True))
         )
+
+    if current_schema.version < 8:
+        _apply_schema_update(
+            current_schema, 8,
+            migrator.add_column(BackupProfileModel._meta.table_name,
+                                'prune_keep_within', pw.CharField(null=True)))

src/vorta/views/archive_tab.py

@@ -40,9 +40,12 @@ class ArchiveTab(ArchiveTabBase, ArchiveTabUI, BackupProfileMixin):
         self.archiveTable.setAlternatingRowColors(True)
 
         # Populate pruning options from database
+        profile = self.profile()
         for i in self.prune_intervals:
-            getattr(self, f'prune_{i}').setValue(getattr(self.profile(), f'prune_{i}'))
+            getattr(self, f'prune_{i}').setValue(getattr(profile, f'prune_{i}'))
             getattr(self, f'prune_{i}').valueChanged.connect(self.save_prune_setting)
+        self.prune_keep_within.setText(profile.prune_keep_within)
+        self.prune_keep_within.editingFinished.connect(self.save_prune_setting)
 
         self.mountButton.clicked.connect(self.mount_action)
         self.listButton.clicked.connect(self.list_action)
@@ -198,10 +201,11 @@ class ArchiveTab(ArchiveTabBase, ArchiveTabUI, BackupProfileMixin):
             self.mountButton.clicked.connect(self.mount_action)
             self.mount_point = None
 
-    def save_prune_setting(self, new_value):
+    def save_prune_setting(self, new_value=None):
         profile = self.profile()
         for i in self.prune_intervals:
             setattr(profile, f'prune_{i}', getattr(self, f'prune_{i}').value())
+        profile.prune_keep_within = self.prune_keep_within.text()
         profile.save()
 
     def extract_action(self):