Initial DD keycode migration (#18643)

* Initial DD keycode migration

* Sort magic keycodes

lib/python/qmk/keycodes.py

@@ -0,0 +1,57 @@
+from pathlib import Path
+
+from qmk.json_schema import deep_update, json_load, validate
+
+CONSTANTS_PATH = Path('data/constants/keycodes/')
+
+
+def _validate(spec):
+    # first throw it to the jsonschema
+    validate(spec, 'qmk.keycodes.v1')
+
+    # no duplicate keycodes
+    keycodes = []
+    for value in spec['keycodes'].values():
+        keycodes.append(value['key'])
+        keycodes.extend(value.get('aliases', []))
+    duplicates = set([x for x in keycodes if keycodes.count(x) > 1])
+    if duplicates:
+        raise ValueError(f'Keycode spec contains duplicate keycodes! ({",".join(duplicates)})')
+
+
+def load_spec(version):
+    """Build keycode data from the requested spec file
+    """
+    if version == 'latest':
+        version = list_versions()[0]
+
+    file = CONSTANTS_PATH / f'keycodes_{version}.hjson'
+    if not file.exists():
+        raise ValueError(f'Requested keycode spec ({version}) is invalid!')
+
+    # Load base
+    spec = json_load(file)
+
+    # Merge in fragments
+    fragments = CONSTANTS_PATH.glob(f'keycodes_{version}_*.hjson')
+    for file in fragments:
+        deep_update(spec, json_load(file))
+
+    # Sort?
+    spec['keycodes'] = dict(sorted(spec['keycodes'].items()))
+
+    # Validate?
+    _validate(spec)
+
+    return spec
+
+
+def list_versions():
+    """Return available versions - sorted newest first
+    """
+    ret = []
+    for file in CONSTANTS_PATH.glob('keycodes_[0-9].[0-9].[0-9].hjson'):
+        ret.append(file.stem.split('_')[1])
+
+    ret.sort(reverse=True)
+    return ret