Added config validator and tests for it

pre_commit/clientlib/validate_config.py

@@ -0,0 +1,72 @@
+
+from __future__ import print_function
+
+import argparse
+
+import pre_commit.constants as C
+from pre_commit.clientlib.validate_base import get_validator
+
+
+class InvalidConfigError(ValueError): pass
+
+
+CONFIG_JSON_SCHEMA = {
+    'type': 'array',
+    'minItems': 1,
+    'items': {
+        'type': 'object',
+        'properties': {
+            'repo': {'type': 'string'},
+            'sha': {'type': 'string'},
+            'hooks': {
+                'type': 'array',
+                'minItems': 1,
+                'items': {
+                    'type': 'object',
+                    'properties': {
+                        'id': {'type': 'string'},
+                        'files': {'type': 'string'},
+                        'args': {
+                            'type': 'array',
+                            'minItems': 1,
+                            'items': {'type': 'string'},
+                        },
+                    },
+                    'required': ['id', 'files'],
+                }
+            }
+        },
+        'required': ['repo', 'sha', 'hooks'],
+    }
+}
+
+
+validate_manifest = get_validator(
+    C.CONFIG_FILE,
+    CONFIG_JSON_SCHEMA,
+    InvalidConfigError,
+)
+
+
+def run(argv):
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        'filename',
+        nargs='?', default=None,
+        help='Config filename.  Defaults to {0} at root of git repo'.format(
+            C.CONFIG_FILE,
+        )
+    )
+    args = parser.parse_args(argv)
+
+    try:
+        validate_manifest(args.filename)
+    except InvalidConfigError as e:
+        print(e.args[0])
+        # If we have more than one exception argument print the stringified
+        # version
+        if len(e.args) > 1:
+            print(str(e.args[1]))
+        return 1
+
+    return 0