added a script to check for warnings

Signed-off-by: sarfaraz siddiqui <sarfarazsiddiqui199@gmail.com>

.github/workflows/standard_library_tests_and_examples.yml

@@ -99,12 +99,14 @@ jobs:
       
       - name: Validate documentation strings
         run: |
-          mojo doc -warn-missing-doc-strings -o /dev/null stdlib/src/
+          mojo doc -warn-missing-doc-strings -o /dev/null stdlib/src/ > warnings.txt 2>&1
+          ./check-file-is-empty.py warnings.txt
           if [ $? -ne 0 ]; then
             echo "::error::Documentation string validation failed. Please fix the issues and try again."
             exit 1
           fi
 
+
       - name: Run standard library tests and examples
         run: |
           ./stdlib/scripts/run-tests.sh

stdlib/scripts/check-file-is-empty.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+# ===----------------------------------------------------------------------=== #
+# Copyright (c) 2024, Modular Inc. All rights reserved.
+#
+# Licensed under the Apache License v2.0 with LLVM Exceptions:
+# https://llvm.org/LICENSE.txt
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ===----------------------------------------------------------------------=== #
+
+import argparse
+import os
+import sys
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description=(
+            "Exits successfully if the file at the given path is empty or does"
+            " not exist. Otherwise, prints the file's contents, then exits"
+            " unsuccessfully."
+        )
+    )
+    parser.add_argument("path")
+    args = parser.parse_args()
+
+    if not os.path.exists(args.path):
+        return
+
+    with open(args.path, "r") as f:
+        content = f.read().strip()
+        if content:
+            print(
+                f"error: '{args.path}' is not empty:\n{content}",
+                file=sys.stderr,
+            )
+            exit(1)
+
+
+if __name__ == "__main__":
+    main()