Fix type issues

varats/varats/tools/driver_feature.py

@@ -107,7 +107,7 @@ def __prompt_location(
     feature_name: str,
     commit_hash: FullCommitHash,
     old_location: tp.Optional[Location] = None
-) -> tp.Optional[Location]:
+) -> Location:
     parse_location: tp.Callable[[str], tp.Optional[Location]]
     if old_location is not None:
         parse_location = partial(
@@ -116,22 +116,26 @@ def __prompt_location(
     else:
         parse_location = Location.parse_string
 
-    return click.prompt(
-        f"Enter location for feature {feature_name} @ {commit_hash.short_hash}",
-        value_proc=parse_location
+    return tp.cast(
+        Location,
+        click.prompt(
+            f"Enter location for feature {feature_name} @ {commit_hash.short_hash}",
+            value_proc=parse_location
+        )
     )
 
 
 def __get_location_content(commit: Commit,
                            location: Location) -> tp.Optional[str]:
     assert location.start_line == location.end_line, \
         "Multiline locations are not supported yet."
-    lines = tp.cast(Blob, commit.tree[location.file]).data.splitlines()
+    lines: tp.List[bytes] = tp.cast(Blob, commit.tree[location.file
+                                                     ]).data.splitlines()
 
     if len(lines) < location.start_line:
         return None
 
-    line = lines[location.start_line - 1].decode("utf-8")
+    line: str = lines[location.start_line - 1].decode("utf-8")
 
     if len(line) <= location.end_col:
         return None
@@ -157,7 +161,7 @@ def main() -> None:
     required=False
 )
 def __annotate(
-    project: str, revision: tp.Optional[str], outfile: tp.IO
+    project: str, revision: tp.Optional[str], outfile: tp.TextIO
 ) -> None:
     initialize_cli_tool()
 
@@ -187,9 +191,9 @@ def __annotate(
         last_annotations[feature_name] = FeatureAnnotation(
             feature_name, location, commit_hash
         )
-        last_annotation_targets[feature_name] = __get_location_content(
-            first_commit, location
-        )
+        target = __get_location_content(first_commit, location)
+        assert target is not None, "Target must not be None"
+        last_annotation_targets[feature_name] = target
         tracked_features[feature_name] = []
         LOG.debug(
             f"Tracking {feature_name} @ {location}: {last_annotation_targets[feature_name]}"
@@ -221,9 +225,9 @@ def __annotate(
                 last_annotations[feature] = FeatureAnnotation(
                     feature, new_location, commit_hash
                 )
-                last_annotation_targets[feature] = __get_location_content(
-                    commit, new_location
-                )
+                new_target = __get_location_content(commit, new_location)
+                assert new_target is not None, "Target must not be None"
+                last_annotation_targets[feature] = new_target
                 LOG.debug(
                     f"Tracking {feature} @ {new_location}: {last_annotation_targets[feature]}"
                 )