Connect minimal hosts to snapshots, target workers and shared Kit editing

scripts/prepare-fixture-host.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+"""Create a fresh editable development fixture and explicit local host setup."""
+import argparse
+import json
+from pathlib import Path
+import shutil
+ROOT = Path(__file__).resolve().parent.parent
+parser = argparse.ArgumentParser(description=__doc__)
+parser.add_argument("--destination", type=Path, required=True)
+parser.add_argument("--target-java-home", type=Path, required=True)
+parser.add_argument("--mode", choices=["classpath", "modulepath"], default="classpath")
+args = parser.parse_args()
+destination = args.destination.resolve()
+shutil.copytree(ROOT / "integration-fixtures/preview" / args.mode, destination,
+                ignore=shutil.ignore_patterns("target"))
+local = destination / ".neitzel-fx-designer"
+local.mkdir()
+(local / "runtimes.json").write_text(json.dumps({"schemaVersion":"1.0","runtimes":{"java21":{"build":str(args.target_java_home.resolve()),"target":str(args.target_java_home.resolve())}}}))
+tools = [ROOT / ("designer-" + name) / "target" / ("designer-" + name + "-0.1.0-SNAPSHOT.jar")
+         for name in ("target-tools","contracts","preview-api")]
+# Properties separators in values do not need escaping; double backslashes do.
+def prop(value): return str(value).replace("\\", "\\\\")
+(local / "host.properties").write_text(
+    "configuration=../neitzel-fx-designer.json\ncontext=fixture\nsettings=runtimes.json\n"
+    + "maven=" + prop(ROOT / "mvnw") + "\ntools=" + ":".join(map(prop, tools)) + "\n")
+print(local / "host.properties")
+print(destination / "app/src/main/resources/fixture/components/Person.fxml")