Add keybind to close views

src/command.zig

@@ -111,3 +111,10 @@ pub fn spawn(server: *Server, arg: Arg) void {
     const child = std.ChildProcess.init(&argv, std.heap.c_allocator) catch unreachable;
     std.ChildProcess.spawn(child) catch unreachable;
 }
+
+/// Close the focused view, if any.
+pub fn close(server: *Server, arg: Arg) void {
+    if (server.root.focused_view) |view| {
+        view.close();
+    }
+}

src/config.zig

@@ -75,5 +75,7 @@ pub const Config = struct {
 
         try self.keybinds.append(Keybind{ .keysym = c.XKB_KEY_0, .modifiers = mod, .command = command.focusTags, .arg = .{ .uint = 0xFFFFFFFF } });
         try self.keybinds.append(Keybind{ .keysym = c.XKB_KEY_0, .modifiers = mod | c.WLR_MODIFIER_SHIFT, .command = command.setFocusedViewTags, .arg = .{ .uint = 0xFFFFFFFF } });
+
+        try self.keybinds.append(Keybind{ .keysym = c.XKB_KEY_q, .modifiers = mod, .command = command.close, .arg = .{ .none = {} } });
     }
 };

src/view.zig

@@ -126,6 +126,13 @@ pub const View = struct {
         }
     }
 
+    /// Send a close event to the view's client
+    pub fn close(self: Self) void {
+        // Note: we don't call arrange() here as it will be called
+        // automatically when the view is unmapped.
+        c.wlr_xdg_toplevel_send_close(self.wlr_xdg_surface);
+    }
+
     fn handleMap(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
         // Called when the surface is mapped, or ready to display on-screen.
         const view = @fieldParentPtr(View, "listen_map", listener.?);