From 56e0fc69fbe3630475f886dc257c1b9fed0b6c9a Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 24 Nov 2020 21:29:55 +0530
Subject: [PATCH] Fix #1904392 [[Enhancement] Add ability to remove author by
 right clicking in the Book details
 panel](https://bugs.launchpad.net/calibre/+bug/1904392)

---
 src/calibre/gui2/actions/edit_metadata.py | 5 +++++
 src/calibre/gui2/book_details.py          | 7 ++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/actions/edit_metadata.py b/src/calibre/gui2/actions/edit_metadata.py
index d27aebb4ad..8f396c855d 100644
--- a/src/calibre/gui2/actions/edit_metadata.py
+++ b/src/calibre/gui2/actions/edit_metadata.py
@@ -884,6 +884,11 @@ class EditMetadataAction(InterfaceAction):
             identifiers = db.field_for(field, book_id)
             if identifiers.pop(value, False) is not False:
                 affected_books = db.set_field(field, {book_id:identifiers})
+        elif field == 'authors':
+            authors = db.field_for(field, book_id)
+            new_authors = [x for x in authors if x != value] or [_('Unknown')]
+            if new_authors != authors:
+                affected_books = db.set_field(field, {book_id:new_authors})
         elif fm['is_multiple']:
             item_id = db.get_item_id(field, value)
             if item_id is not None:
diff --git a/src/calibre/gui2/book_details.py b/src/calibre/gui2/book_details.py
index ac63011b36..f8b3e9023e 100644
--- a/src/calibre/gui2/book_details.py
+++ b/src/calibre/gui2/book_details.py
@@ -245,6 +245,7 @@ def add_format_entries(menu, data, book_info):
 
 
 def add_item_specific_entries(menu, data, book_info):
+    from calibre.gui2.ui import get_gui
     search_internet_added = False
     find_action = book_info.find_in_tag_browser_action
     dt = data['type']
@@ -271,8 +272,12 @@ def add_item_specific_entries(menu, data, book_info):
         if hasattr(book_info, 'search_requested'):
             menu.addAction(_('Search calibre for %s') % author,
                             lambda : book_info.search_requested('authors:"={}"'.format(author.replace('"', r'\"'))))
+            ac = book_info.remove_item_action
+            book_id = get_gui().library_view.current_id
+            ac.data = ('authors', author, book_id)
+            ac.setText(_('Remove %s from this book') % escape_for_menu(author))
+            menu.addAction(ac)
     elif dt in ('path', 'devpath'):
-        from calibre.gui2.ui import get_gui
         path = data['loc']
         ac = book_info.copy_link_action
         if isinstance(path, int):