refresh_modules.py: avoid the eval() call

gouttelette/cmd/refresh_modules.py

@@ -1294,7 +1294,6 @@ def main():
     if not generator:
         raise Exception("gouttelette.yaml is missing generator value")
 
-    generator_coll = re.sub("(.*)_code_generator", r"\1", generator["name"])
     parser = argparse.ArgumentParser(
         description=f"Build the {generator['name']} modules."
     )
@@ -1320,8 +1319,12 @@ def main():
             help="location where to store the collected schemas (default: ./gouttelette/api_specifications/amazon_cloud)",
         )
     args = parser.parse_args()
-    func = "generate_" + generator_coll + "(args)"
-    eval(func)
+
+    func = {
+        "vmware_rest_code_generator": generate_vmware_rest,
+        "amazon_cloud_code_generator": generate_amazon_cloud,
+    }[generator["name"]]
+    func(args)
 
     info = VersionInfo(generator["name"])
     dev_md = args.target_dir / "dev.md"