Start work on giving GLFW a proper clipboard API

kitty/clipboard.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+# License: GPLv3 Copyright: 2022, Kovid Goyal <kovid at kovidgoyal.net>
+
+import io
+from typing import IO, Callable, Dict, Union
+
+from .constants import supports_primary_selection
+from .fast_data_types import GLFW_CLIPBOARD, get_boss, set_clipboard_data_types
+
+DataType = Union[bytes, 'IO[bytes]']
+
+
+class Clipboard:
+
+    def __init__(self, clipboard_type: int = GLFW_CLIPBOARD) -> None:
+        self.data: Dict[str, DataType] = {}
+        self.clipboard_type = clipboard_type
+        self.enabled = self.clipboard_type == GLFW_CLIPBOARD or supports_primary_selection
+
+    def set_text(self, x: Union[str, bytes]) -> None:
+        if self.enabled:
+            self.data.clear()
+            if isinstance(x, str):
+                x = x.encode('utf-8')
+            self.data['text/plain'] = x
+            set_clipboard_data_types(self.clipboard_type, tuple(self.data))
+
+    def get_text(self) -> str:
+        raise NotImplementedError('TODO: Implement this')
+
+    def __call__(self, mime: str) -> Callable[[], bytes]:
+        data = self.data.get(mime, b'')
+        if isinstance(data, bytes):
+            def chunker() -> bytes:
+                nonlocal data
+                assert isinstance(data, bytes)
+                ans = data
+                data = b''
+                return ans
+            return chunker
+
+        data.seek(0, 0)
+
+        def io_chunker() -> bytes:
+            assert not isinstance(data, bytes)
+            return data.read(io.DEFAULT_BUFFER_SIZE)
+        return io_chunker
+
+
+def set_clipboard_string(x: Union[str, bytes]) -> None:
+    get_boss().clipboard.set_text(x)
+
+
+def get_clipboard_string() -> str:
+    return get_boss().clipboard.get_text()
+
+
+def set_primary_selection(x: Union[str, bytes]) -> None:
+    get_boss().primary_selection.set_text(x)
+
+
+def get_primary_selection() -> str:
+    return get_boss().primary_selection.get_text()