Add integration scaffolding script (#26777)

* Add integration scaffolding script

* Make easier to develop

* Update py.test -> pytest

script/scaffold/gather_info.py

@@ -0,0 +1,79 @@
+"""Gather info for scaffolding."""
+from homeassistant.util import slugify
+
+from .const import COMPONENT_DIR
+from .model import Info
+from .error import ExitApp
+
+
+CHECK_EMPTY = ["Cannot be empty", lambda value: value]
+
+
+FIELDS = {
+    "domain": {
+        "prompt": "What is the domain?",
+        "validators": [
+            CHECK_EMPTY,
+            [
+                "Domains cannot contain spaces or special characters.",
+                lambda value: value == slugify(value),
+            ],
+            [
+                "There already is an integration with this domain.",
+                lambda value: not (COMPONENT_DIR / value).exists(),
+            ],
+        ],
+    },
+    "name": {
+        "prompt": "What is the name of your integration?",
+        "validators": [CHECK_EMPTY],
+    },
+    "codeowner": {
+        "prompt": "What is your GitHub handle?",
+        "validators": [
+            CHECK_EMPTY,
+            [
+                'GitHub handles need to start with an "@"',
+                lambda value: value.startswith("@"),
+            ],
+        ],
+    },
+    "requirement": {
+        "prompt": "What PyPI package and version do you depend on? Leave blank for none.",
+        "validators": [
+            ["Versions should be pinned using '=='.", lambda value: "==" in value]
+        ],
+    },
+}
+
+
+def gather_info() -> Info:
+    """Gather info from user."""
+    answers = {}
+
+    for key, info in FIELDS.items():
+        hint = None
+        while key not in answers:
+            if hint is not None:
+                print()
+                print(f"Error: {hint}")
+
+            try:
+                print()
+                value = input(info["prompt"] + "\n> ")
+            except (KeyboardInterrupt, EOFError):
+                raise ExitApp("Interrupted!", 1)
+
+            value = value.strip()
+            hint = None
+
+            for validator_hint, validator in info["validators"]:
+                if not validator(value):
+                    hint = validator_hint
+                    break
+
+            if hint is None:
+                answers[key] = value
+
+    print()
+    return Info(**answers)