command: Implement spawn-tagmask

river/Output.zig

@@ -73,6 +73,9 @@ layout: []const u8,
 /// Determines where new views will be attached to the view stack.
 attach_mode: AttachMode = .top,
 
+/// Bitmask that whitelists tags for newly spawned views
+spawn_tagmask: u32 = std.math.maxInt(u32),
+
 /// List of status tracking objects relaying changes to this output to clients.
 status_trackers: std.SinglyLinkedList(OutputStatus) = .{},
 

river/Server.zig

@@ -177,7 +177,7 @@ fn handleNewXdgSurface(listener: *wl.Listener(*wlr.XdgSurface), xdg_surface: *wl
         xdg_surface.resource.postNoMemory();
         return;
     };
-    node.view.init(output, output.current.tags, xdg_surface);
+    node.view.init(output, getNewViewTags(output), xdg_surface);
 }
 
 /// This event is raised when the layer_shell recieves a new surface from a client.
@@ -247,5 +247,10 @@ fn handleNewXwaylandSurface(listener: *wl.Listener(*wlr.XwaylandSurface), wlr_xw
     // The View will add itself to the output's view stack on map
     const output = self.input_manager.defaultSeat().focused_output;
     const node = util.gpa.create(ViewStack(View).Node) catch return;
-    node.view.init(output, output.current.tags, wlr_xwayland_surface);
+    node.view.init(output, getNewViewTags(output), wlr_xwayland_surface);
+}
+
+fn getNewViewTags(output: *Output) u32 {
+    const tags = output.current.tags & output.spawn_tagmask;
+    return if (tags != 0) tags else output.current.tags;
 }

river/command.zig

@@ -71,6 +71,7 @@ const str_to_impl_fn = [_]struct {
     .{ .name = "set-view-tags",          .impl = @import("command/tags.zig").setViewTags },
     .{ .name = "snap",                   .impl = @import("command/move.zig").snap },
     .{ .name = "spawn",                  .impl = @import("command/spawn.zig").spawn },
+    .{ .name = "spawn-tagmask",          .impl = @import("command/tags.zig").spawnTagmask },
     .{ .name = "swap",                   .impl = @import("command/swap.zig").swap},
     .{ .name = "toggle-float",           .impl = @import("command/toggle_float.zig").toggleFloat },
     .{ .name = "toggle-focused-tags",    .impl = @import("command/tags.zig").toggleFocusedTags },

river/command/tags.zig

@@ -36,6 +36,17 @@ pub fn setFocusedTags(
     }
 }
 
+/// Set the spawn tagmask
+pub fn spawnTagmask(
+    allocator: *std.mem.Allocator,
+    seat: *Seat,
+    args: []const []const u8,
+    out: *?[]const u8,
+) Error!void {
+    const tags = try parseTags(allocator, args, out);
+    seat.focused_output.spawn_tagmask = tags;
+}
+
 /// Set the tags of the focused view.
 pub fn setViewTags(
     allocator: *std.mem.Allocator,