add ability to follow group: items

api.lua

@@ -8,7 +8,7 @@ local use_cmi = minetest.global_exists("cmi")
 
 mobs = {
 	mod = "redo",
-	version = "20210310",
+	version = "20210323",
 	intllib = S,
 	invis = minetest.global_exists("invisibility") and invisibility or {}
 }
@@ -251,9 +251,17 @@ local check_for = function(look_for, look_inside)
 		for _, str in pairs(look_inside) do
 
 			if str == look_for then
-
 				return true
 			end
+
+			if str:find("group:") then
+
+				local group = str:split(":")[2]
+
+				if minetest.get_item_group(look_for, group) ~= 0 then
+					return true
+				end
+			end
 		end
 	end
 
@@ -2697,34 +2705,17 @@ function mob_class:falling(pos)
 	-- sanity check
 	if not v then return end
 
-	local fall_speed = -10 -- gravity
-
-	-- don't exceed mob fall speed
-	if v.y < self.fall_speed then
-		fall_speed = self.fall_speed
-	end
+	local fall_speed = self.fall_speed
 
 	-- in water then use liquid viscosity for float/sink speed
-	if (self.standing_in
-	and minetest.registered_nodes[self.standing_in].groups.liquid)
-	or (self.standing_on
-	and minetest.registered_nodes[self.standing_in].groups.liquid) then
+	if self.floats == 1 and self.standing_in
+	and minetest.registered_nodes[self.standing_in].groups.liquid then
 
 		local visc = min(
-				minetest.registered_nodes[self.standing_in].liquid_viscosity, 7)
+				minetest.registered_nodes[self.standing_in].liquid_viscosity, 7) + 1
 
-		if self.floats == 1 then
-
-			-- floating up
-			if visc > 0 then
-				fall_speed = max(1, v.y) / (visc + 1)
-			end
-		else
-			-- sinking down
-			if visc > 0 then
-				fall_speed = -(max(1, v.y) / (visc + 1))
-			end
-		end
+		self.object:set_velocity({x = v.x, y = 0.6, z = v.z})
+		fall_speed = -1.2 / visc
 	else
 
 		-- fall damage onto solid ground

api.txt

@@ -76,7 +76,7 @@ functions needed for the mob to work properly which contains the following:
    'floats'        when set to 1 mob will float in water, 0 has them sink.
    'follow'        mobs follow player when holding any of the items which appear
                    on this table, the same items can be fed to a mob to tame or
-                   breed e.g. {"farming:wheat", "default:apple"}
+                   breed e.g. {"farming:wheat", "default:apple", "group:fish"}
 
    'reach'               is how far the mob can attack player when standing
                          nearby, default is 3 nodes.