Call fetch/download metadata from GUI plugin

During develop LubimyCzytac [Metadata Source Plugin] in config I allow to download number of pages and save to comment and/or as identifier "lcpages" (abbreviation from "LubimyCzytac pages").

Now I prepared auxiliary plugin named "LCpages" [GUI plugin].
Plugin move number of pages value from "lcpages" identifier to custom column (for example "#pages"). This option works as intended and rapidly.

Code:

Spoiler:

Code:

    def action_lcpages(self):

        if not self.is_library_selected:

            return error_dialog(self.gui, _('No selected book'),

                    _('No book selected for move LCpages to custom column'), show=True)

            return



        rows = self.gui.library_view.selectionModel().selectedRows()

        if not rows or len(rows) == 0 :

            return error_dialog(self.gui, _('No selected book'),

                    _('No book selected for move LCpages to custom column'), show=True)

        book_ids = self.gui.library_view.get_selected_ids()



        any_valid, colforpages = self._get_column_validity(cfg.KEY_PAGES_CUSTOM_COLUMN)

        if not any_valid:

            if not question_dialog(self.gui, _('Configure plugin'), '<p>'+

                _('You must specify custom columns first. Do you want to configure this now?'),

                show_copy_button=False):

                return

            self.show_configuration()

            return



        col_pag = colforpages



        overwrite_pages = self._is_overwrite_pages(cfg.OVERWRITE_PAGES)



        self.dzialaj_lcpages(book_ids, col_pag, overwrite_pages)



    def dzialaj_lcpages(self, book_ids, col_pag, overwrite_pages):



        dbA = self.gui.current_db



        db = self.gui.current_db.new_api



        id_aux = {}



        for id in book_ids:



            identifiers = dbA.get_identifiers(id, index_is_id=True)

            id_aux[id] = identifiers.get('lcpages', None)



            mi = dbA.get_metadata(id, index_is_id=True, get_cover=False)

            pagesval = mi.get(col_pag)



            if id_aux[id]:

               if pagesval is not None:

                   if overwrite_pages:

                       db.set_field(col_pag, {id:id_aux[id]})

               else:

                   db.set_field(col_pag, {id:id_aux[id]})



               #Delete unnecessary identifier  lcpages

               deleteid = dbA.set_identifier(id,'lcpages', '')



               self.gui.iactions['Edit Metadata'].refresh_gui(book_ids, covers_changed=False)

I would like to start fetch/download metadata from LubimyCzytac source (by LubimyCzytac plugin of course),
and next run standard primary function (move value from identifier to custom column).

I can call "Edit Metadata" window:

Code:

    def edycjametadanych(self):

        from calibre.library import db

        from calibre.gui2.metadata.single import edit_metadata

        db = db()

        row_list = list(range(len(db.data)))

        edit_metadata(db, row_list, 0)

I can call "LubimyCzytac" config:

Code:

    def _configure_lubimyczytac(self):

        from calibre.customize.ui import initialized_plugins

        for plugin in initialized_plugins():

            if plugin.name == 'LubimyCzytac':



                if not plugin.is_customizable():

                    return info_dialog(self, _('Plugin not customizable'),

                        _('Plugin: %s does not need customization')%plugin.name, show=True)

                from calibre.customize import InterfaceActionBase

                if isinstance(plugin, InterfaceActionBase) and not getattr(plugin,

                        'actual_iaction_plugin_loaded', False):

                    return error_dialog(self, _('Must restart'),

                            _('You must restart calibre before you can'

                                ' configure the <b>%s</b> plugin')%plugin.name, show=True)

                plugin.do_user_config(self.parent())

Unfortunately, I can not call the fetch/download metadata by using LubimyCzytac plugin. I've read various threads about calling plugins from other plugins. I was trying for many hours - without success.

Is possible call fetch/download metadata from GUI plugin and next run other functions?

Code:

My plan:

1. Download metadata

2. Move value from ID to custom column

3. Delete ID

I would also like to check whether LubimyCzytac is enabled as a source of metadata.

Does my concept make sense?

PS. Count Pages plugin supporting LubimyCzytac (thx davidfor) is OK, but I want to test my own solution only for speed fill custom column once downloaded value.

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