attach-mode: implement after <N>

river/Output.zig

@@ -36,6 +36,7 @@ const LockSurface = @import("LockSurface.zig");
 const OutputStatus = @import("OutputStatus.zig");
 const SceneNodeData = @import("SceneNodeData.zig");
 const View = @import("View.zig");
+const AttachMode = @import("Config.zig").AttachMode;
 
 const log = std.log.scoped(.output);
 
@@ -166,6 +167,8 @@ current: struct {
 /// Remembered version of tags (from last run)
 previous_tags: u32 = 1 << 0,
 
+attach_mode: ?AttachMode = null,
+
 /// List of all layouts
 layouts: std.TailQueue(Layout) = .{},
 
@@ -608,3 +611,7 @@ pub fn handleLayoutNamespaceChange(self: *Self) void {
 pub fn layoutNamespace(self: Self) []const u8 {
     return self.layout_namespace orelse server.config.default_layout_namespace;
 }
+
+pub fn attachMode(self: Self) AttachMode {
+    return self.attach_mode orelse server.config.default_attach_mode;
+}