feat(island): keyboard layout of the main keyboard

The flag follows whichever keyboard Hyprland marks main, looked up on every
activelayout event and every switch. wb-lang read a fixed device name and
went blank when the keyboard moved from its dongle to USB. Flags copied
from waybar-theme-udt, which goes away with waybar.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/desktop/island/Keyboard.qml b/desktop/island/Keyboard.qml
new file mode 100644
index 0000000..1cbe9bc
--- /dev/null
+++ b/desktop/island/Keyboard.qml
@@ -0,0 +1,61 @@
+// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+pragma Singleton
+
+import Quickshell
+import Quickshell.Io
+import Quickshell.Hyprland
+import QtQuick
+import "Logic.js" as Logic
+
+// The layout of whichever keyboard Hyprland marks main. Resolved per event,
+// never cached: the same keyboard is a different device over USB and over
+// its dongle, which is what broke wb-lang's hardcoded device name.
+Singleton {
+    id: root
+
+    property string keymap: ""
+    readonly property string flag: Logic.flagFor(keymap)
+
+    readonly property string mainKeyboard:
+        "hyprctl devices -j | jq -r '.keyboards[] | select(.main) | .name'"
+
+    Process {
+        id: query
+        running: true
+        command: ["sh", "-c",
+            "hyprctl devices -j | jq -r '.keyboards[] | select(.main) | .active_keymap'"]
+        stdout: StdioCollector { onStreamFinished: root.keymap = text.trim() }
+    }
+
+    Process { id: switcher }
+
+    function refresh() {
+        query.running = false;
+        query.running = true;
+    }
+
+    // dir is "next" or "prev", from the caller's own literal, never user text.
+    function cycle(dir) {
+        switcher.command = ["sh", "-c",
+            `hyprctl switchxkblayout "$(${root.mainKeyboard})" ${dir}`];
+        switcher.running = false;
+        switcher.running = true;
+    }
+
+    Connections {
+        target: Hyprland
+        function onRawEvent(event) {
+            if (event.name === "activelayout") root.refresh();
+        }
+    }
+}