Add callback parameter for core.emerge_area()

builtin/game/chatcommands.lua

@@ -436,6 +436,31 @@ core.register_chatcommand("set", {
 	end,
 })
 
+local function emergeblocks_callback(pos, action, num_calls_remaining, ctx)
+	if ctx.total_blocks == 0 then
+		ctx.total_blocks   = num_calls_remaining + 1
+		ctx.current_blocks = 0
+	end
+	ctx.current_blocks = ctx.current_blocks + 1
+
+	if ctx.current_blocks == ctx.total_blocks then
+		core.chat_send_player(ctx.requestor_name,
+			string.format("Finished emerging %d blocks in %.2fms.",
+			ctx.total_blocks, (os.clock() - ctx.start_time) * 1000))
+	end
+end
+
+local function emergeblocks_progress_update(ctx)
+	if ctx.current_blocks ~= ctx.total_blocks then
+		core.chat_send_player(ctx.requestor_name,
+			string.format("emergeblocks update: %d/%d blocks emerged (%.1f%%)",
+			ctx.current_blocks, ctx.total_blocks,
+			(ctx.current_blocks / ctx.total_blocks) * 100))
+
+		core.after(2, emergeblocks_progress_update, ctx)
+	end
+end
+
 core.register_chatcommand("emergeblocks", {
 	params = "(here [radius]) | (<pos1> <pos2>)",
 	description = "starts loading (or generating, if inexistent) map blocks "
@@ -447,7 +472,16 @@ core.register_chatcommand("emergeblocks", {
 			return false, p2
 		end
 
-		core.emerge_area(p1, p2)
+		local context = {
+			current_blocks = 0,
+			total_blocks   = 0,
+			start_time     = os.clock(),
+			requestor_name = name
+		}
+
+		core.emerge_area(p1, p2, emergeblocks_callback, context)
+		core.after(2, emergeblocks_progress_update, context)
+
 		return true, "Started emerge of area ranging from " ..
 			core.pos_to_string(p1, 1) .. " to " .. core.pos_to_string(p2, 1)
 	end,

builtin/game/constants.lua

@@ -0,0 +1,12 @@
+-- Minetest: builtin/constants.lua
+
+--
+-- Constants values for use with the Lua API
+--
+
+-- Block emerge status constants (for use with core.emerge_area)
+core.EMERGE_CANCELLED   = 0
+core.EMERGE_ERRORED     = 1
+core.EMERGE_FROM_MEMORY = 2
+core.EMERGE_FROM_DISK   = 3
+core.EMERGE_GENERATED   = 4

builtin/game/init.lua

@@ -5,6 +5,7 @@ local gamepath = scriptpath.."game"..DIR_DELIM
 
 dofile(commonpath.."vector.lua")
 
+dofile(gamepath.."constants.lua")
 dofile(gamepath.."item.lua")
 dofile(gamepath.."register.lua")
 
@@ -25,4 +26,3 @@ dofile(gamepath.."features.lua")
 dofile(gamepath.."voxelarea.lua")
 dofile(gamepath.."forceloading.lua")
 dofile(gamepath.."statbars.lua")
-