Add MessagingMenu plugin

Makefile.am

@@ -60,7 +60,9 @@ plugin_DATA = \
 	plugins/plugin-installer.py \
 	plugins/plugin-installer.plugin \
 	plugins/trayicon.py \
-	plugins/trayicon.plugin
+	plugins/trayicon.plugin \
+	plugins/messagingmenu.py \
+	plugins/messagingmenu.plugin
 
 gsettings_SCHEMAS = net.sf.liferea.gschema.xml
 @INTLTOOL_XML_NOMERGE_RULE@

plugins/messagingmenu.plugin

@@ -0,0 +1,8 @@
+[Plugin]
+Module=messagingmenu
+Loader=python3
+Icon=indicator-messages
+Name=Unity MessagingMenu integration
+Description=Shows new feed entries in the Unity MessagingMenu
+Authors=Tasos Sahanidis <[email protected]>
+Copyright=Copyright (C) 2023 Tasos Sahanidis

plugins/messagingmenu.py

@@ -0,0 +1,138 @@
+"""
+MessagingMenu Plugin
+
+Copyright (C) 2023 Tasos Sahanidis <[email protected]>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
+import gettext
+import html
+import gi
+gi.require_version("Gtk", "3.0")
+gi.require_version("GLib", "2.0")
+gi.require_version("MessagingMenu", "1.0")
+
+from gi.repository import GObject, Gtk, Gio, MessagingMenu, Liferea
+
+_ = lambda x: x
+try:
+    t = gettext.translation("liferea")
+except FileNotFoundError:
+    pass
+else:
+    _ = t.gettext
+
+class MessagingMenuPlugin(GObject.Object, Liferea.ShellActivatable):
+    __gtype_name__ = "MessagingMenuPlugin"
+
+    object = GObject.property(type=GObject.Object)
+    shell = GObject.property(type=Liferea.Shell)
+    mmapp = None
+    window = None
+    treeview = None
+    model = None
+    delete_signal_id = None
+    new_only = False
+    sources = []
+
+    def _source_activated(self, app, source_id):
+        # Clear all sources and re-add them because it's the only way to preserve the order...
+        for path in self.sources:
+            app.remove_source(path)
+
+        # This needs to be done because _on_node_changed() re-adds the entries
+        sources_copy = list(self.sources)
+        self.sources.clear()
+        for path in sources_copy:
+            path_iter = self.model.get_iter_from_string(path)
+            self._on_node_changed(self.model, path, path_iter, app)
+
+        # Show (if hidden) and focus window
+        self.window.present()
+
+        # Set selection to correct item based on source_id
+        selection = self.treeview.get_selection()
+        source_id_path = Gtk.TreePath.new_from_string(source_id)
+        selection.select_path(source_id_path)
+
+    def _on_node_changed(self, model, path, iter, mmapp):
+        # path is TreePath when called from "row-changed"
+        path = str(path)
+
+        # If the node has children, ignore it as we need to flatten the tree
+        if model.iter_has_child(iter):
+            return
+
+        # Slightly hacky, but certain GThemedIcons are used only for non-feed entries, so ignore them
+        node_icon = model.get_value(iter, 1)
+        if isinstance(node_icon, Gio.ThemedIcon):
+            if any("folder-saved-search" in n for n in node_icon.get_names()):
+                return
+            # FIXME: The icon is broken otherwise (default rss icon)
+            node_icon = None
+
+        node_unread = model.get_value(iter, 3)
+
+        # Remove sources that have 0 unread nodes
+        source_exists = mmapp.has_source(path)
+        if node_unread == 0:
+            #print("zero")
+            if source_exists:
+                mmapp.remove_source(path)
+                self.sources.remove(path)
+        elif source_exists:
+            #print("exists")
+            # Update source count if already exists
+            mmapp.set_source_count(path, node_unread)
+        else:
+            #print("new")
+            # Add new source
+            # WARNING: Python 3.4+
+            node_text = html.unescape(model.get_value(iter, 0))
+            print(node_text)
+            mmapp.append_source_with_count(path, node_icon, node_text, node_unread)
+            self.sources.append(path)
+
+    def minimize_on_close(self, widget, event):
+        self.window.hide()
+        return True
+
+    def do_activate(self):
+        self.mmapp = MessagingMenu.App(desktop_id = "net.sourceforge.liferea.desktop")
+        self.mmapp.register()
+        self.mmapp.connect("activate-source", self._source_activated)
+
+        # Get GtkTreeStore and connect signals
+        self.treeview = self.shell.lookup("feedlist")
+        self.model = self.treeview.get_model()
+        self.model.connect("row-changed", self._on_node_changed, self.mmapp)
+
+        # Update MessagingMenu on first start
+        if not self.new_only:
+            self.model.foreach(self._on_node_changed, self.mmapp)
+
+        # Hide on close
+        self.window = self.shell.get_window()
+        self.delete_signal_id = GObject.signal_lookup("delete_event", Gtk.Window)
+        GObject.signal_handlers_block_matched(self.window, GObject.SignalMatchType.ID | GObject.SignalMatchType.DATA, self.delete_signal_id, 0, None, None, None)
+        self.window.connect("delete_event", self.minimize_on_close)
+
+    def do_deactivate(self):
+        self.mmapp.unregister()
+        self.mmapp = None
+
+        # Undo hide on close
+        self.window.disconnect_by_func(self.minimize_on_close)
+        GObject.signal_handlers_unblock_matched (self.window, GObject.SignalMatchType.ID | GObject.SignalMatchType.DATA, self.delete_signal_id, 0, None, None, None)