1 files changed, 27 insertions, 0 deletions
diff --git a/src/command/focus_output.zig b/src/command/focus_output.zig
new file mode 100644
index 0000000..368bb96
--- /dev/null
+++ b/src/command/focus_output.zig
@@ -0,0 +1,27 @@
+const c = @import("../c.zig");
+const std = @import("std");
+
+const Arg = @import("../command.zig").Arg;
+const Output = @import("../output.zig").Output;
+const Seat = @import("../seat.zig").Seat;
+
+/// Focus either the next or the previous output, depending on the bool passed.
+/// Does nothing if there is only one output.
+pub fn focusOutput(seat: *Seat, arg: Arg) void {
+    const direction = arg.direction;
+    const root = &seat.input_manager.server.root;
+    // If the noop output is focused, there are no other outputs to switch to
+    if (seat.focused_output == &root.noop_output) {
+        std.debug.assert(root.outputs.len == 0);
+        return;
+    }
+
+    // Focus the next/prev output in the list if there is one, else wrap
+    const focused_node = @fieldParentPtr(std.TailQueue(Output).Node, "data", seat.focused_output);
+    seat.focused_output = switch (direction) {
+        .Next => if (focused_node.next) |node| &node.data else &root.outputs.first.?.data,
+        .Prev => if (focused_node.prev) |node| &node.data else &root.outputs.last.?.data,
+    };
+
+    seat.focus(null);
+}