Add a Mac as the third system, beside Wayland and X11

Dikte already chose its clipboard programs once instead of in every
function; macOS joins that table rather than adding a branch to each one.
A Mac copies through pbcopy and presses Cmd+V straight into CoreGraphics,
records through AVFoundation, and asks Carbon for its global shortcuts.

The three tables are paste.Desktop, audio.Sound, and the pair of
predicates in hotkey.py. Each reads sys.platform inside the chooser, so a
test can stand somewhere else: 697 of the 737 tests now run on any
machine, the Wayland and X11 halves included, and the suite passes whole
whichever system it is run on.

Two things a Mac does not have needed saying rather than pretending:
there is no shortcut registry to install into, so Settings offers no
Install button and the listener is the mechanism instead of a fallback;
and nothing is offered as the sound the speakers are playing, so a
meeting needs BlackHole or Loopback and says so. The KDE-only labels
around them were already wrong on GNOME, and now name whichever desktop
is there.

Co-authored-by: firat <[email protected]>

tests/test_config.py

@@ -14,6 +14,7 @@ from unittest import mock
 import api
 import config as cfg
 import i18n
+import paste
 from tests.support import DikteTest
 
 
@@ -422,6 +423,39 @@ class Defaults(unittest.TestCase):
                 with self.subTest(prompt=f"{name}_{suffix}"):
                     self.assertTrue(getattr(cfg, f"{name}_{suffix}").strip())
 
+    def test_the_paste_key_is_the_one_this_desktop_pastes_with(self):
+        """cmd+v on a Mac, and it must be one paste.py can actually press."""
+        self.assertEqual(cfg.DEFAULTS["paste_shortcut"],
+                         paste.desktop().shortcuts[0])
+
+
+class Directories(unittest.TestCase):
+    """Where the settings and the recordings are kept, per system."""
+
+    def test_linux_keeps_them_apart_and_follows_xdg(self):
+        with mock.patch.dict(os.environ, {"XDG_CONFIG_HOME": "/c",
+                                          "XDG_DATA_HOME": "/d"}):
+            config_dir, data_dir = cfg._directories("linux")
+        self.assertEqual(str(config_dir), "/c/dikte")
+        self.assertEqual(str(data_dir), "/d/dikte")
+
+    def test_linux_without_the_variables_set(self):
+        with mock.patch.dict(os.environ, {}, clear=True):
+            config_dir, data_dir = cfg._directories("linux")
+        self.assertTrue(str(config_dir).endswith("/.config/dikte"))
+        self.assertTrue(str(data_dir).endswith("/.local/share/dikte"))
+
+    def test_a_mac_keeps_both_in_application_support(self):
+        config_dir, data_dir = cfg._directories("darwin")
+        self.assertEqual(config_dir, data_dir)
+        self.assertTrue(str(config_dir).endswith("/Library/Application Support/Dikte"))
+
+    def test_a_mac_does_not_read_the_xdg_variables(self):
+        """A Mac with them set from some other tool still stores in one place."""
+        with mock.patch.dict(os.environ, {"XDG_CONFIG_HOME": "/c"}):
+            config_dir, _ = cfg._directories("darwin")
+        self.assertNotIn("/c", str(config_dir))
+
 
 if __name__ == "__main__":
     unittest.main()