apprt/embedded: do not depend on macOS APIs on non-macOS

src/input/KeymapNoop.zig

@@ -0,0 +1,38 @@
+//! A noop implementation of the keymap interface so that the embedded
+//! library can compile on non-macOS platforms.
+const KeymapNoop = @This();
+
+const Mods = @import("key.zig").Mods;
+
+pub const State = struct {};
+pub const Translation = struct {
+    text: []const u8,
+    composing: bool,
+};
+
+pub fn init() !KeymapNoop {
+    return .{};
+}
+
+pub fn deinit(self: *const KeymapNoop) void {
+    _ = self;
+}
+
+pub fn reload(self: *KeymapNoop) !void {
+    _ = self;
+}
+
+pub fn translate(
+    self: *const KeymapNoop,
+    out: []u8,
+    state: *State,
+    code: u16,
+    mods: Mods,
+) !Translation {
+    _ = self;
+    _ = out;
+    _ = state;
+    _ = code;
+    _ = mods;
+    return .{ .text = "", .composing = false };
+}