add bazelisk command

Author: ohmayr

.generator/cli.py

@@ -17,6 +17,7 @@
 import logging
 import os
 import sys
+import subprocess
 
 logger = logging.getLogger()
 
@@ -37,14 +38,40 @@ def handle_configure(dry_run=False):
 
 def handle_generate(dry_run=False):
 
-    # Read a generate-request.json file
     if not dry_run:
+        
+        # Read generate-request.json file
         try:
             request_data = _read_json_file(f"{LIBRARIAN_DIR}/{GENERATE_REQUEST_FILE}")
         except Exception as e:
             logger.error(f"failed to read {LIBRARIAN_DIR}/{GENERATE_REQUEST_FILE}: {e}")
             sys.exit(1)
 
+        library_id = request_data.get("id")
+        if not library_id:
+            logger.error("Request file is missing required 'id' field.")
+            sys.exit(1)
+
+        for api in request_data.get("apis", []):
+            api_path = api.get("path")
+            if api_path:
+                try:
+                    query = f'filter("-py$", kind("rule", //{api_path}/...:*))'
+                    command = ["bazelisk", "query", query]
+                    result = subprocess.run(
+                        command, capture_output=True, text=True, check=True
+                    )
+
+                    bazel_rule = result.stdout.strip()
+                    if not bazel_rule:
+                        logger.error("Bazel query returned an empty result.")
+                        sys.exit(1)
+
+                    logger.info(f"Found Bazel rule: {bazel_rule}")
+                except Exception as e:
+                    logger.error(f"Bazelisk query failed: {e}")
+                    sys.exit(1)
+
         logger.info(json.dumps(request_data, indent=2))
 
     # TODO(https://github.com/googleapis/librarian/issues/448): Implement generate command.

.generator/test_cli.py

@@ -17,7 +17,7 @@
 import json
 import logging
 
-from unittest.mock import mock_open
+from unittest.mock import mock_open, MagicMock
 
 from cli import (
     _read_json_file,
@@ -59,16 +59,30 @@ def test_handle_generate_dry_run():
     handle_generate(dry_run=True)
 
 
-def test_handle_generate_success(caplog, mock_generate_request_file):
+def test_handle_generate_success(caplog, mock_generate_request_file, mocker):
     """
     Tests the successful execution path of handle_generate.
     """
     caplog.set_level(logging.INFO)
 
+    mock_query_result = MagicMock(
+        stdout="//google/cloud/language/v1:google-cloud-language-v1-py\n",
+        returncode=0
+    )
+
+    mock_subprocess = mocker.patch(
+        "cli.subprocess.run",
+        side_effect=[mock_query_result]
+    )
+
+
     handle_generate(dry_run=False)
 
+    #captured = capsys.readouterr()
     assert "google-cloud-language" in caplog.text
+    assert "Found Bazel rule: //google/cloud/language/v1:google-cloud-language-v1-py" in caplog.text
     assert "'generate' command executed." in caplog.text
+    assert mock_subprocess.call_count == 1
 
 
 def test_handle_build_dry_run():