Added CLI interface for ad-hoc validation

Author: venthur

README.md

@@ -17,6 +17,12 @@ OpenAPI Spec Validator is a Python library that validates OpenAPI Specs against
 
 ## Usage
 
+Command Line Interface:
+
+```bash
+$ openapi_spec_validator some.yaml
+```
+
 Validate spec:
 
 ```python

openapi_spec_validator/__main__.py

@@ -0,0 +1,36 @@
+import logging
+import optparse
+import os
+import sys
+
+from openapi_spec_validator import validate_spec_url
+from openapi_spec_validator.exceptions import ValidationError
+
+logger = logging.getLogger(__name__)
+logging.basicConfig(
+    format='%(asctime)s %(levelname)s %(name)s %(message)s',
+    level=logging.WARNING
+)
+
+
+def main():
+    usage = 'Usage: %prog filename'
+    parser = optparse.OptionParser(usage)
+    (options, args) = parser.parse_args()
+    if len(args) != 1:
+        parser.error('You must provide a filename to validate')
+    filename = args[0]
+    filename = os.path.abspath(filename)
+    try:
+        validate_spec_url('file://'+filename)
+    except ValidationError as e:
+        print(e)
+        sys.exit(1)
+    except Exception as e:
+        print(e)
+        sys.exit(2)
+    else:
+        print('OK')
+
+if __name__ == '__main__':
+    main()

setup.py

@@ -67,6 +67,11 @@ def run_tests(self):
         ],
     },
     include_package_data=True,
+    entry_points={
+        'console_scripts': [
+            'openapi-spec-validator = openapi_spec_validator.__main__:main'
+        ]
+    },
     install_requires=read_requirements('requirements.txt'),
     tests_require=read_requirements('requirements_dev.txt'),
     cmdclass={'test': PyTest},