Add wireviz_kroki wrapper

wireviz_kroki.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import sys
+import argparse
+import wireviz.wireviz as wv
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description=
+"""Wireviz Kroki wrapper.
+Reads YAML data from stdin and writes output to stdout.
+Errors and messages from WireViz are printed to stderr.""")   
+    
+    output_formats = ["svg", "png", "harness"]
+
+    parser.add_argument("--format", type=str, required=True, choices=output_formats, 
+                        help=f"Supported output formats.")
+    parser.add_argument("output", type=str, choices=["-"], help="'-' for stdout")
+    args = parser.parse_args()
+    
+    try:
+        data = wv.parse(inp = sys.stdin.read(), return_types=args.format)
+        if not args.output == "-":
+            raise ValueError("Only stdout output is supported")
+
+        if isinstance(data, str):
+            sys.stdout.write(data)
+        elif isinstance(data, bytes):
+            sys.stdout.buffer.write(data)
+        else:
+            raise ValueError("Unsupported data format")
+
+    except Exception as e:
+        sys.stderr.write(str(e))