fix: remove no-op self-assignment 'fromcall = fromcall' in USMetarPlugin (#272)

In the else-branch of USMetarPlugin.process(), 'fromcall = fromcall'
is a self-assignment that does nothing.  It was likely a leftover from
an edit that intended to reassign fromcall but forgot to write the RHS.
Remove the dead line.  The variable is still used correctly on the next
line (get_aprs_fi call).

Closes #253

ChangeLog.md

@@ -8,6 +8,8 @@ Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 
 ##### Bug Fixes
 
+- Fix USMetarPlugin.process() self-assignment no-op 'fromcall = fromcall' [`44ff252`](https://github.com/craigerl/aprsd/commit/44ff252)
+
 - Add reset() to @singleton decorator; update tests to use ClassName.reset() instead of ClassName.instance = None [`ef19aaa`](https://github.com/craigerl/aprsd/commit/ef19aaa)
 
 - Fix PacketTrack.keys/items/values — return list snapshots instead of live dict views outside the lock [`088436e`](https://github.com/craigerl/aprsd/commit/088436e)

aprsd/plugins/weather.py

@@ -121,8 +121,6 @@ class USMetarPlugin(plugin.APRSDRegexCommandPluginBase, plugin.APRSFIKEYMixin):
             return reply
         else:
             # if no second argument, search for calling station
-            fromcall = fromcall
-
             api_key = CONF.aprs_fi.apiKey
 
             try:

tests/plugins/test_weather.py

@@ -202,3 +202,26 @@ class TestUSMetarPlugin(test_plugin.TestPlugin):
         packet = fake.fake_packet(message='metar')
         actual = wx.filter(packet)
         self.assertEqual(expected, actual)
+
+    @mock.patch('aprsd.plugins.weather.plugin_utils.get_aprs_fi')
+    def test_process_no_station_arg_uses_fromcall(self, mock_aprs_fi):
+        """USMetarPlugin.process() must use packet.from_call when no station arg given.
+
+        Previously the else-branch contained the no-op 'fromcall = fromcall' which
+        was dead code.  This test verifies that fromcall is still passed correctly
+        to get_aprs_fi after that line was removed.
+        """
+        mock_aprs_fi.side_effect = Exception('aprs.fi down')
+
+        CONF.aprs_fi.apiKey = 'abc123'
+        CONF.callsign = fake.FAKE_TO_CALLSIGN
+        wx = weather_plugin.USMetarPlugin()
+        wx.enabled = True
+
+        # A message with no second word: regex will not match → else-branch
+        packet = fake.fake_packet(message='metar')
+        result = wx.filter(packet)
+
+        # Should call get_aprs_fi with the packet's from_call
+        mock_aprs_fi.assert_called_once_with('abc123', fake.FAKE_FROM_CALLSIGN)
+        self.assertIn('Failed', result)