Use conductor via context manager

PFERD/conductor.py

@@ -1,6 +1,7 @@
 import asyncio
 from contextlib import asynccontextmanager, contextmanager
-from typing import AsyncIterator, Iterator, List, Optional
+from types import TracebackType
+from typing import AsyncIterator, Iterator, List, Optional, Type
 
 import rich
 from rich.progress import Progress, TaskID
@@ -22,24 +23,30 @@ class TerminalConductor:
         self._progress = Progress()
         self._lines: List[str] = []
 
-    def _start(self) -> None:
+    async def _start(self) -> None:
+        async with self._lock:
             for line in self._lines:
                 rich.print(line)
             self._lines = []
 
             self._progress.start()
 
-    def _stop(self) -> None:
+    async def _stop(self) -> None:
+        async with self._lock:
             self._progress.stop()
             self._stopped = True
 
-    async def start(self) -> None:
-        async with self._lock:
-            self._start()
+    async def __aenter__(self) -> None:
+        await self._start()
 
-    async def stop(self) -> None:
-        async with self._lock:
-            self._stop()
+    async def __aexit__(
+            self,
+            exc_type: Optional[Type[BaseException]],
+            exc_value: Optional[BaseException],
+            traceback: Optional[TracebackType],
+    ) -> Optional[bool]:
+        await self._stop()
+        return None
 
     def print(self, line: str) -> None:
         if self._stopped:
@@ -50,11 +57,11 @@ class TerminalConductor:
     @asynccontextmanager
     async def exclusive_output(self) -> AsyncIterator[None]:
         async with self._lock:
-            self.stop()
+            self._stop()
             try:
                 yield
             finally:
-                self.start()
+                self._start()
 
     @contextmanager
     def progress_bar(

PFERD/crawler.py

@@ -63,11 +63,8 @@ class Crawler(ABC):
         return self.progress_bar(desc, total=size)
 
     async def run(self) -> None:
-        await self._conductor.start()
-        try:
+        async with self._conductor:
             await self.crawl()
-        finally:
-            await self._conductor.stop()
 
     @abstractmethod
     async def crawl(self) -> None: