Add an Author mapper tool to manipulate author names in the existing library. Accessible via Preferences->Toolbars

src/calibre/customize/builtins.py

@@ -907,6 +907,12 @@ class ActionTagMapper(InterfaceActionBase):
     description = _('Filter/transform the tags for books in the library')
 
 
+class ActionAuthorMapper(InterfaceActionBase):
+    name = 'Author Mapper'
+    actual_plugin = 'calibre.gui2.actions.author_mapper:AuthorMapAction'
+    description = _('Transform the authors for books in the library')
+
+
 class ActionTemplateTester(InterfaceActionBase):
     name = 'Template Tester'
     actual_plugin = 'calibre.gui2.actions.show_template_tester:ShowTemplateTesterAction'
@@ -1076,7 +1082,7 @@ plugins += [ActionAdd, ActionFetchAnnotations, ActionGenerateCatalog,
         ActionAddToLibrary, ActionEditCollections, ActionMatchBooks, ActionChooseLibrary,
         ActionCopyToLibrary, ActionTweakEpub, ActionUnpackBook, ActionNextMatch, ActionStore,
         ActionPluginUpdater, ActionPickRandom, ActionEditToC, ActionSortBy,
-        ActionMarkBooks, ActionEmbed, ActionTemplateTester, ActionTagMapper,
+        ActionMarkBooks, ActionEmbed, ActionTemplateTester, ActionTagMapper, ActionAuthorMapper,
         ActionVirtualLibrary]
 
 # }}}

src/calibre/ebooks/metadata/author_mapper.py

@@ -6,6 +6,7 @@ from __future__ import absolute_import, division, print_function, unicode_litera
 
 import re
 from collections import deque
+from future_builtins import map
 
 from calibre.utils.icu import capitalize, lower, upper
 

src/calibre/gui2/actions/author_mapper.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python2
+# vim:fileencoding=utf-8
+# License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
+
+from __future__ import (unicode_literals, division, absolute_import,
+                        print_function)
+from future_builtins import map
+
+from calibre.gui2 import gprefs
+from calibre.gui2.actions import InterfaceAction
+
+
+class AuthorMapAction(InterfaceAction):
+
+    name = 'Author Mapper'
+    action_spec = (_('Author mapper'), 'user_profile.png', _('Transform the authors for books in the library'), None)
+    action_type = 'current'
+
+    def genesis(self):
+        self.qaction.triggered.connect(self.start_map)
+
+    def start_map(self):
+        rows = self.gui.library_view.selectionModel().selectedRows()
+        selected = True
+        if not rows or len(rows) < 2:
+            selected = False
+            rows = xrange(self.gui.library_view.model().rowCount(None))
+        ids = set(map(self.gui.library_view.model().id, rows))
+        self.do_map(ids, selected)
+
+    def do_map(self, book_ids, selected):
+        from calibre.ebooks.metadata.author_mapper import map_authors, compile_rules
+        from calibre.gui2.author_mapper import RulesDialog
+        from calibre.gui2.device import BusyCursor
+        d = RulesDialog(self.gui)
+        d.setWindowTitle(ngettext(
+            'Map authors for one book in the library',
+            'Map authors for {} books in the library', len(book_ids)).format(len(book_ids)))
+        d.rules = gprefs.get('library-author-mapper-ruleset', ())
+        txt = ngettext(
+            'The changes will be applied to the <b>selected book</b>',
+            'The changes will be applied to the <b>{} selected books</b>', len(book_ids)) if selected else ngettext(
+            'The changes will be applied to <b>one book in the library</b>',
+            'The changes will be applied to <b>{} books in the library</b>', len(book_ids))
+        d.edit_widget.msg_label.setText(d.edit_widget.msg_label.text() + '<p>' + txt.format(len(book_ids)))
+        if d.exec_() != d.Accepted:
+            return
+        with BusyCursor():
+            rules = d.rules
+            gprefs.set('library-author-mapper-ruleset', rules)
+            rules = compile_rules(rules)
+            db = self.gui.current_db.new_api
+            author_map = db.all_field_for('authors', book_ids)
+            changed_author_map = {}
+            changed_author_sort_map = {}
+            for book_id, authors in author_map.iteritems():
+                authors = list(authors)
+                new_authors = map_authors(authors, rules)
+                if authors != new_authors:
+                    changed_author_map[book_id] = new_authors
+                    changed_author_sort_map[book_id] = db.author_sort_from_authors(new_authors)
+            if changed_author_map:
+                db.set_field('authors', changed_author_map)
+                db.set_field('author_sort', changed_author_sort_map)
+                self.gui.library_view.model().refresh_ids(tuple(changed_author_map), current_row=self.gui.library_view.currentIndex().row())