fix: 'Timer' logic

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "common"
 description = "Commonly reusable code"
-version = "0.1.19"
+version = "0.1.20"
 requires-python = ">=3.13"
 authors = [
   { name="BreakerBear", email="breakerbear@autistic.men" },

src/common/timer.py

@@ -6,17 +6,17 @@ class Timer:
         self.clear()
     
     def clear(self):
-        self.checkpoint = None
         self.accumulator = 0
+        self.checkpoint = 0
     
     def start(self):
-        seconds = floor(time())
-        self.checkpoint = seconds
+        self.accumulator = self.delta()
+        self.checkpoint = floor(time())
     
     def pause(self):
-        assert self.checkpoint is not None, "Uninitialized"
         self.accumulator = self.delta()
+        self.checkpoint = 0
     
     def delta(self):
-        assert self.checkpoint is not None, "Uninitialized"
-        return floor(time()) - self.checkpoint + self.accumulator
+        excess = floor(time()) - rhs if (rhs := self.checkpoint) else 0
+        return excess + self.accumulator