From e4e6d6053c512d647c70007599539d14116af92b Mon Sep 17 00:00:00 2001
From: Charles Haley <cbhaley@i.wont.say.com>
Date: Mon, 12 Apr 2021 17:12:39 +0100
Subject: [PATCH] Enhancement #1923365: Tag browser: Delete identifiers in
 context menu.

---
 src/calibre/gui2/tag_browser/ui.py   | 30 +++++++++++++++++++++++++++-
 src/calibre/gui2/tag_browser/view.py | 22 ++++++++++++++++++++
 2 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/tag_browser/ui.py b/src/calibre/gui2/tag_browser/ui.py
index dd2626b96b..77fb7418eb 100644
--- a/src/calibre/gui2/tag_browser/ui.py
+++ b/src/calibre/gui2/tag_browser/ui.py
@@ -6,7 +6,7 @@ __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
-import textwrap
+import copy, textwrap
 from functools import partial
 
 from qt.core import (
@@ -87,6 +87,7 @@ class TagBrowserMixin(object):  # {{{
         self.tags_view.restriction_error.connect(self.do_restriction_error,
                                                  type=Qt.ConnectionType.QueuedConnection)
         self.tags_view.tag_item_delete.connect(self.do_tag_item_delete)
+        self.tags_view.tag_identifier_delete.connect(self.delete_identifier)
         self.tags_view.apply_tag_to_selected.connect(self.apply_tag_to_selected)
         self.populate_tb_manage_menu(db)
         self.tags_view.model().user_categories_edited.connect(self.user_categories_edited,
@@ -380,6 +381,33 @@ class TagBrowserMixin(object):  # {{{
             self.library_view.model().refresh_ids(set(changes), current_row=self.library_view.currentIndex().row())
             self.tags_view.recount_with_position_based_index()
 
+    def delete_identifier(self, name, in_vl):
+        d = self.current_db.new_api
+        changed = False
+        books_to_use = self.tags_view.model().get_book_ids_to_use() if in_vl else d.all_book_ids()
+        ids = d.all_field_for('identifiers', books_to_use)
+        new_ids = {}
+        for id_ in ids:
+            for identifier_type in ids[id_]:
+                if identifier_type == name:
+                    new_ids[id_] = copy.copy(ids[id_])
+                    new_ids[id_].pop(name)
+                    changed = True
+        if changed:
+            if in_vl:
+                msg = _('The identifier %s will be deleted from books in the '
+                        'current virtual library. Are you sure?')%name
+            else:
+                msg= _('The identifier %s will be deleted from all books. Are you sure?')%name
+            if not question_dialog(self,
+                title=_('Delete identifier'),
+                msg= msg,
+                skip_dialog_name='tag_browser_delete_identifiers',
+                skip_dialog_msg=_('Show this confirmation again')):
+                return
+            d.set_field('identifiers', new_ids)
+            self.tags_view.recount_with_position_based_index()
+
     def edit_enum_values(self, parent, db, key):
         from calibre.gui2.dialogs.enum_values_edit import EnumValuesEdit
         d = EnumValuesEdit(parent, db, key)
diff --git a/src/calibre/gui2/tag_browser/view.py b/src/calibre/gui2/tag_browser/view.py
index 43b54d542c..e95b9f4c81 100644
--- a/src/calibre/gui2/tag_browser/view.py
+++ b/src/calibre/gui2/tag_browser/view.py
@@ -174,6 +174,7 @@ class TagsView(QTreeView):  # {{{
     drag_drop_finished      = pyqtSignal(object)
     restriction_error       = pyqtSignal()
     tag_item_delete         = pyqtSignal(object, object, object, object, object)
+    tag_identifier_delete   = pyqtSignal(object, object)
     apply_tag_to_selected   = pyqtSignal(object, object, object)
     edit_enum_values        = pyqtSignal(object, object, object)
 
@@ -530,6 +531,12 @@ class TagsView(QTreeView):  # {{{
                 self.tag_item_delete.emit(key, id_, tag.original_name,
                                           None, children)
                 return
+            if action == 'delete_identifier':
+                self.tag_identifier_delete.emit(index.tag.name, False)
+                return
+            if action == 'delete_identifier_in_vl':
+                self.tag_identifier_delete.emit(index.tag.name, True)
+                return
             if action == 'open_editor':
                 self.tags_list_edit.emit(category, key, is_first_letter)
                 return
@@ -766,6 +773,21 @@ class TagsView(QTreeView):  # {{{
                                 _('Delete Saved search %s')%display_name(tag),
                                 partial(self.context_menu_handler,
                                         action='delete_search', key=tag.original_name))
+                    elif key == 'identifiers':
+                        if self.model().get_in_vl():
+                            self.context_menu.addAction(self.delete_icon,
+                                    _('Delete %s in Virtual Library')%display_name(tag),
+                                    partial(self.context_menu_handler,
+                                            action='delete_identifier_in_vl',
+                                            key=key, index=tag_item))
+                        else:
+                            self.context_menu.addAction(self.delete_icon,
+                                    _('Delete %s')%display_name(tag),
+                                    partial(self.context_menu_handler,
+                                            action='delete_identifier',
+                                            key=key, index=tag_item))
+
+
                     if key.startswith('@') and not item.is_gst:
                         self.context_menu.addAction(self.user_category_icon,
                             _('Remove %(item)s from category %(cat)s')%