Wire up the backend

kittens/choose_fonts/backend.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+# License: GPLv3 Copyright: 2024, Kovid Goyal <kovid at kovidgoyal.net>
+
+import json
+import sys
+from typing import Any
+
+from kitty.fonts.common import get_variable_data_for_descriptor
+from kitty.fonts.list import create_family_groups
+
+
+def send_to_kitten(x: Any) -> None:
+    sys.stdout.buffer.write(json.dumps(x).encode())
+    sys.stdout.buffer.write(b'\n')
+    sys.stdout.buffer.flush()
+
+
+def main() -> None:
+    for line in sys.stdin.buffer:
+        cmd = json.loads(line)
+        action = cmd.get('action', '')
+        if action == 'list_monospaced_fonts':
+            send_to_kitten(create_family_groups())
+        elif action == 'read_variable_data':
+            ans = []
+            for descriptor in cmd['descriptors']:
+                ans.append(get_variable_data_for_descriptor(descriptor))
+            send_to_kitten(ans)
+        else:
+            raise SystemExit(f'Unknown action: {action}')