feat(subprocess): Stub out composable mixins

Author: tony

libvcs/_internal/subprocess.py

@@ -350,3 +350,38 @@ def run(
             timeout=timeout,
             check=check,
         )
+
+
+#
+# Composable mixins
+#
+
+
+class TeeStdoutMixin:
+    def stdout_callback(self, *args, **kwargs):
+        raise NotImplementedError
+
+    def get_stdout_callback(self):
+        return self.stdout_callback
+
+
+class TeeStderrMixin:
+    def stderr_callback(self, *args, **kwargs):
+        raise NotImplementedError
+
+    def get_stderr_callback(self):
+        return self.stderr_callback
+
+
+class CaptureStdoutMixin:
+    """Logs all stdout
+
+    Compatible with TeeStdout. Makes it possible to stream output and look back.
+    """
+
+
+class CaptureStderrMixin:
+    """Logs all stderr
+
+    Compatible with TeeStderr. Makes it possible to stream output and look back.
+    """