Add integration scaffolding script (#26777)

* Add integration scaffolding script

* Make easier to develop

* Update py.test -> pytest

script/scaffold/generate.py

@@ -0,0 +1,47 @@
+"""Generate an integration."""
+import json
+from pathlib import Path
+
+from .const import COMPONENT_DIR, TESTS_DIR
+from .model import Info
+
+TEMPLATE_DIR = Path(__file__).parent / "templates"
+TEMPLATE_INTEGRATION = TEMPLATE_DIR / "integration"
+TEMPLATE_TESTS = TEMPLATE_DIR / "tests"
+
+
+def generate(info: Info) -> None:
+    """Generate an integration."""
+    print(f"Generating the {info.domain} integration...")
+    integration_dir = COMPONENT_DIR / info.domain
+    test_dir = TESTS_DIR / info.domain
+
+    replaces = {
+        "NEW_DOMAIN": info.domain,
+        "NEW_NAME": info.name,
+        "NEW_CODEOWNER": info.codeowner,
+        # Special case because we need to keep the list empty if there is none.
+        '"MANIFEST_NEW_REQUIREMENT"': (
+            json.dumps(info.requirement) if info.requirement else ""
+        ),
+    }
+
+    for src_dir, target_dir in (
+        (TEMPLATE_INTEGRATION, integration_dir),
+        (TEMPLATE_TESTS, test_dir),
+    ):
+        # Guard making it for test purposes.
+        if not target_dir.exists():
+            target_dir.mkdir()
+
+        for source_file in src_dir.glob("**/*"):
+            content = source_file.read_text()
+
+            for to_search, to_replace in replaces.items():
+                content = content.replace(to_search, to_replace)
+
+            target_file = target_dir / source_file.relative_to(src_dir)
+            print(f"Writing {target_file}")
+            target_file.write_text(content)
+
+    print()