Expose call objects on DBus

This exports call objects on the session bus:

 $ gdbus monitor --session -d sm.puri.Calls
 …
 /sm/puri/Calls: org.freedesktop.DBus.ObjectManager.InterfacesAdded (objectpath '/sm/puri/Calls/Call/1', {'sm.puri.Calls.Call': {'Inbound': <false>, 'State': <uint32 0>, 'Id': <''>, 'Party': <''>}})
 /sm/puri/Calls/Call/1: org.freedesktop.DBus.Properties.PropertiesChanged ('sm.puri.Calls.Call', {'Id': <'0987654321'>, 'Inbound': <true>, 'State': <uint32 5>}, @as [])
 /sm/puri/Calls: org.freedesktop.DBus.ObjectManager.InterfacesRemoved (objectpath '/sm/puri/Calls/Call/1', ['sm.puri.Calls.Call'])
 $ gdbus call --session --dest sm.puri.Calls --object-path /sm/puri/Calls/Call/1 --method sm.puri.Calls.Call.Hangup

Currenty hangup and accept methods are implemented as well as exposing
the current call state.

src/dbus/meson.build

@@ -1,14 +1,9 @@
 generated_dbus_sources = []
 
 # DBus server protocols
-generated_dbus_sources += gnome.gdbus_codegen('calls-dbus',
-                'sm.puri.Calls.xml',
-                docbook: 'calls',
-                interface_prefix: 'sm.puri',
-                namespace: 'CallsDBus')
-
 generated_dbus_sources += gnome.gdbus_codegen('calls-call-dbus',
                 'sm.puri.Calls.Call.xml',
                 docbook: 'calls',
                 interface_prefix: 'sm.puri',
-                namespace: 'CallsCallDBus')
+                object_manager: true,
+                namespace: 'CallsDBus')

src/dbus/sm.puri.Calls.Call.xml

@@ -20,17 +20,20 @@
 -->
 
 <node>
+
   <interface name="sm.puri.Calls.Call">
-    <method name="AcceptCall"/>
-    <method name="EndCall"/>
-    <method name="HoldCall"/>
-    <method name="UnholdCall"/>
-    <method name="SendDtmf">
-      <arg direction="in" type="s" name="tones"/>
-    </method>
-    <property name="CallParty" type="as" access="read"/>
-    <property name="CallIsConference" type="b" access="read"/>
-    <property name="CallState" type="u" access="read"/>
-    <property name="Origin" type="s" access="read"/>
+    <method name="Accept"/>
+    <method name="Hangup"/>
+    <property name="Inbound" type="b" access="read"/>
+    <property name="State" type="u" access="read"/>
+    <property name="Id" type="s" access="read">
+      <doc:doc>
+        <doc:description>
+          <doc:para>The Id identifying the call, e.g. a phone number</doc:para>
+        </doc:description>
+      </doc:doc>
+    </property>
+    <property name="Party" type="s" access="read"/>
   </interface>
+
 </node>

src/dbus/sm.puri.Calls.xml

@@ -1,53 +0,0 @@
-<!DOCTYPE node PUBLIC
-        "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
-        "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
-
-<!--
-        Copyright (C) 2021 Purism SPC
-
-        This library 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 library 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 library; if not, see <http://www.gnu.org/licenses/>.
--->
-
-<node>
-  <interface name="sm.puri.Calls">
-    <method name="Dial">
-      <arg type="s" direction="in" name="number"/>
-      <arg type="b" direction="out" name="success"/>
-    </method>
-    <method name="GetCalls">
-      <arg type="ao" direction="out" name="calls">
-      <doc:doc>
-        <doc:summary>an array of ongoing calls</doc:summary>
-      </doc:doc>
-    </arg>
-    <doc:doc>
-      <doc:description>
-        <doc:para>This gets a list of all <doc:ref type="interface" to="sm.puri.Calls.Call">Calls</doc:ref>
-        that are currently ongoing.</doc:para>
-        <doc:para>Each Call is an D-Bus object path for the object that implements the
-        <doc:ref type="interface" to="sm.puri.Calls.Call">Call</doc:ref> interface.</doc:para>
-      </doc:description>
-    </doc:doc>
-  </method>
-    <property name="HasOngoingCall" type="b" access="read"/>
-    <signal name="CallAdded">
-      <arg name="id" type="u"/>
-      <arg name="parameters" type="a{sv}"/>
-    </signal>
-    <signal name="CallRemoved">
-      <arg name="id" type="u"/>
-      <arg name="parameters" type="a{sv}"/>
-    </signal>
-  </interface>
-</node>