intial setup for passing arbitrary data to hooks

runtime/share/mezzaluna/init.lua

@@ -51,7 +51,8 @@ end
 -- })
 
 mez.hook.add_hook("ViewMapPre", {
-  callback = function()
+  callback = function(a)
+    print(a)
     print("hello world")
   end
 })

src/types/events.zig

@@ -41,12 +41,12 @@ pub fn put(self: *Events, key: []const u8, hook: *const Hook) !void {
 // TODO: figure out deletion
 // pub fn del(self: *Events, key: ???) !void {}
 
-pub fn exec(self: *Events, event: []const u8) void {
+pub fn exec(self: *Events, event: []const u8, args: anytype) void {
   if (self.events.get(event)) |e| {
     var node = e.first;
     while (node) |n| : (node = n.next) {
       const data: *Node = @fieldParentPtr("node", n);
-      data.hook.callback();
+      data.hook.callback(args);
 
       // FIXME: not sure why but for some reason our ll doesn't seem to want to
       // admit that there's nothing after the first node.

src/types/hook.zig

@@ -17,7 +17,13 @@ options: struct {
   lua_cb_ref_idx: i32,
 },
 
-pub fn callback(self: *const Hook) void {
+pub fn callback(self: *const Hook, args: anytype) void {
+  const ArgsType = @TypeOf(args);
+  const args_type_info = @typeInfo(ArgsType);
+  if (args_type_info != .@"struct") {
+    @compileError("expected tuple or struct argument, found " ++ @typeName(ArgsType));
+  }
+
   const t = Lua.state.rawGetIndex(zlua.registry_index, self.options.lua_cb_ref_idx);
   if (t != zlua.LuaType.function) {
     std.log.err("Failed to call hook, it doesn't have a callback.", .{});
@@ -25,8 +31,19 @@ pub fn callback(self: *const Hook) void {
     return;
   }
 
+  var i: u8 = 0;
+  inline for (args, 0..) |field, k| {
+    // std.log.debug("{any}", .{field});
+
+    // oh dear god I hope this works
+    std.log.debug("sldkjf {any}", .{field});
+    try Lua.state.pushAny(field);
+    i = k;
+  }
+
   // TODO: we need to send some data along with the callback, this data will
   // change based on the event which the user is hooking into
-  Lua.state.call(.{ .args = 0, .results = 0 });
+  Lua.state.protectedCall(.{ .args = i, .results = 0 }) catch {
+  };
   Lua.state.pop(-1);
 }

src/view.zig

@@ -100,7 +100,7 @@ fn handleMap(listener: *wl.Listener(void)) void {
   const view: *View = @fieldParentPtr("map", listener);
   std.log.debug("Mapping view '{s}'", .{view.xdg_toplevel.title orelse "(unnamed)"});
 
-  server.events.exec("ViewMapPre");
+  server.events.exec("ViewMapPre", .{view.id});
 
   view.xdg_toplevel.events.request_fullscreen.add(&view.request_fullscreen);
   view.xdg_toplevel.events.request_move.add(&view.request_move);
@@ -124,7 +124,7 @@ fn handleMap(listener: *wl.Listener(void)) void {
 
   view.mapped = true;
 
-  server.events.exec("ViewMapPost");
+  server.events.exec("ViewMapPost", .{});
 }
 
 fn handleUnmap(listener: *wl.Listener(void)) void {