Migrate from setup.py to pyproject.toml (#440)

* Converted setup.py to pyproject.toml

* Modern package infrastructure as recommended by py docs

trustgraph-cli/trustgraph/cli/get_flow_class.py

@@ -0,0 +1,54 @@
+"""
+Outputs a flow class definition in JSON format.
+"""
+
+import argparse
+import os
+import tabulate
+from trustgraph.api import Api
+import json
+
+default_url = os.getenv("TRUSTGRAPH_URL", 'http://localhost:8088/')
+
+def get_flow_class(url, class_name):
+
+    api = Api(url).flow()
+
+    cls = api.get_class(class_name)
+
+    print(json.dumps(cls, indent=4))
+
+def main():
+
+    parser = argparse.ArgumentParser(
+        prog='tg-get-flow-class',
+        description=__doc__,
+    )
+
+    parser.add_argument(
+        '-u', '--api-url',
+        default=default_url,
+        help=f'API URL (default: {default_url})',
+    )
+
+    parser.add_argument(
+        '-n', '--class-name',
+        required=True,
+        help=f'Flow class name',
+    )
+
+    args = parser.parse_args()
+
+    try:
+
+        get_flow_class(
+            url=args.api_url,
+            class_name=args.class_name,
+        )
+
+    except Exception as e:
+
+        print("Exception:", e, flush=True)
+
+if __name__ == "__main__":
+    main()