added support for relative changes in position

yaqd_watchdog/_watchdog.py

@@ -25,7 +25,7 @@ def check(self) -> float:
             self._remaining = self.timeout
             self._last = time.time()
         else:
-            self._remaining = max(0, self.timeout + (self._last - time.time()))
+            self._remaining = max(0.0, self.timeout + (self._last - time.time()))
         return self._remaining
 
 
@@ -101,6 +101,20 @@ def trigger(self, checks: dict):
             pass
 
 
+@dataclass
+class SetRelativeAction:
+    host: str
+    port: int
+    distance: float
+
+    def trigger(self, checks: dict):
+        try:
+            c = yaqc.Client(host=self.host, port=self.port)
+            c.set_relative(self.distance)
+        except:
+            pass
+
+
 @dataclass
 class SetIdentifierAction:
     host: str

yaqd_watchdog/watchdog.toml

@@ -42,6 +42,13 @@ fields = [{"name"="host", "type"="string", "default"="localhost"},
           {"name"="port", "type"="int"},
           {"name"="position", "type"="float"}]
 
+[[types]]
+type = "record"
+name = "set_relative"
+fields = [{"name"="host", "type"="string", "default"="localhost"},
+          {"name"="port", "type"="int"},
+          {"name"="distance", "type"="float"}]
+
 [[types]]
 type = "record"
 name = "set_identifier"
@@ -71,6 +78,11 @@ type = "map"
 values = "set_position"
 default = {}
 
+[config.set_relative_actions]
+type = "map"
+values = "set_relative"
+default = {}
+
 [config.set_identifier_actions]
 type = "map"
 values = "set_identifier"