add mechanisms for finding and pinging maintainers

lib/python/qmk/maintainers.py

@@ -0,0 +1,22 @@
+from pathlib import Path
+
+from qmk.json_schema import json_load
+
+
+def maintainers(file):
+    """Yields maintainers for a file.
+    """
+    maintainers = 'qmk'
+    file_dir = file if file.is_dir() else file.parent
+
+    cur_path = Path('.')
+
+    for path_part in file_dir.parts:
+        cur_path = cur_path / path_part
+        info_file = cur_path / 'info.json'
+        if info_file.exists():
+            new_info_data = json_load(info_file)
+            maintainers = new_info_data.get('maintainer', maintainers)
+
+    for maintainer in maintainers.replace(',', ' ').split():
+        yield 'qmk/collaborators' if maintainer == 'qmk' else maintainer