Trash bin: Add a button to clear the bin. Fixes #2017232 [Enhancement…

… Request: One-click 'empty recycle bin'](https://bugs.launchpad.net/calibre/+bug/2017232)

src/calibre/db/backend.py

@@ -1984,6 +1984,12 @@ def read_backup(self, path):
     def trash_dir(self):
         return os.path.abspath(os.path.join(self.library_path, TRASH_DIR_NAME))
 
+    def clear_trash_dir(self):
+        tdir = self.trash_dir
+        if os.path.exists(tdir):
+            self.rmtree(tdir)
+            self.ensure_trash_dir()
+
     def ensure_trash_dir(self):
         tdir = self.trash_dir
         os.makedirs(os.path.join(tdir, 'b'), exist_ok=True)

src/calibre/db/cache.py

@@ -2676,6 +2676,10 @@ def close(self):
     def is_closed(self):
         return self.backend.is_closed
 
+    @write_api
+    def clear_trash_bin(self):
+        self.backend.clear_trash_dir()
+
     @read_api
     def list_trash_entries(self):
         books, formats = self.backend.list_trash_entries()

src/calibre/gui2/trash.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 # License: GPLv3 Copyright: 2023, Kovid Goyal <kovid at kovidgoyal.net>
 
-
 import time
 import traceback
 from operator import attrgetter
@@ -15,6 +14,7 @@
 from calibre import fit_image
 from calibre.db.backend import DEFAULT_TRASH_EXPIRY_TIME_SECONDS, TrashEntry
 from calibre.gui2 import error_dialog
+from calibre.gui2.dialogs.confirm_delete import confirm
 from calibre.gui2.widgets import BusyCursor
 from calibre.gui2.widgets2 import Dialog
 
@@ -145,6 +145,7 @@ def setup_ui(self):
         la.setBuddy(ad)
         l.addLayout(h)
 
+        h = QHBoxLayout()
         l.addWidget(self.bb)
         self.restore_button = b = self.bb.addButton(_('&Restore selected'), QDialogButtonBox.ButtonRole.ActionRole)
         b.clicked.connect(self.restore_selected)
@@ -153,6 +154,18 @@ def setup_ui(self):
         b.setToolTip(_('Remove the selected entries from the trash bin, thereby deleting them permanently'))
         b.setIcon(QIcon.ic('edit-clear.png'))
         b.clicked.connect(self.delete_selected)
+        self.clear_button = b = self.bb.addButton(_('&Clear'), QDialogButtonBox.ButtonRole.ResetRole)
+        b.clicked.connect(self.clear_all)
+        b.setIcon(QIcon.ic('dialog_warning.png'))
+        self.update_titles()
+        self.bb.button(QDialogButtonBox.StandardButton.Close).setFocus(Qt.FocusReason.OtherFocusReason)
+
+    def clear_all(self):
+        if not confirm('<p>'+_('All books and formats will be <b>permanently deleted</b>! Are you sure?'), 'clear_trash_bin', self):
+            return
+        self.db.clear_trash_bin()
+        self.books.clear()
+        self.formats.clear()
         self.update_titles()
 
     def update_titles(self):