From 88b052cbea346fd29120837f5b802427bc889be2 Mon Sep 17 00:00:00 2001
From: HybridDog <3192173+HybridDog@users.noreply.github.com>
Date: Sat, 13 Mar 2021 11:18:25 +0100
Subject: Chatcommands: Show the execution time if the command takes a long
 time (#10472)

---
 builtin/game/chat.lua    | 20 ++++++++++++++++++--
 builtin/settingtypes.txt |  4 ++++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/builtin/game/chat.lua b/builtin/game/chat.lua
index e05e83a27..bf2d7851e 100644
--- a/builtin/game/chat.lua
+++ b/builtin/game/chat.lua
@@ -47,6 +47,8 @@ end
 
 core.chatcommands = core.registered_chatcommands -- BACKWARDS COMPATIBILITY
 
+local msg_time_threshold =
+	tonumber(core.settings:get("chatcommand_msg_time_threshold")) or 0.1
 core.register_on_chat_message(function(name, message)
 	if message:sub(1,1) ~= "/" then
 		return
@@ -73,7 +75,9 @@ core.register_on_chat_message(function(name, message)
 	local has_privs, missing_privs = core.check_player_privs(name, cmd_def.privs)
 	if has_privs then
 		core.set_last_run_mod(cmd_def.mod_origin)
+		local t_before = minetest.get_us_time()
 		local success, result = cmd_def.func(name, param)
+		local delay = (minetest.get_us_time() - t_before) / 1000000
 		if success == false and result == nil then
 			core.chat_send_player(name, "-!- "..S("Invalid command usage."))
 			local help_def = core.registered_chatcommands["help"]
@@ -83,8 +87,20 @@ core.register_on_chat_message(function(name, message)
 					core.chat_send_player(name, helpmsg)
 				end
 			end
-		elseif result then
-			core.chat_send_player(name, result)
+		else
+			if delay > msg_time_threshold then
+				-- Show how much time it took to execute the command
+				if result then
+					result = result ..
+						minetest.colorize("#f3d2ff", " (%.5g s)"):format(delay)
+				else
+					result = minetest.colorize("#f3d2ff",
+						"Command execution took %.5f s"):format(delay)
+				end
+			end
+			if result then
+				core.chat_send_player(name, result)
+			end
 		end
 	else
 		core.chat_send_player(name,
diff --git a/builtin/settingtypes.txt b/builtin/settingtypes.txt
index 62f1ee2d0..75efe64da 100644
--- a/builtin/settingtypes.txt
+++ b/builtin/settingtypes.txt
@@ -1136,6 +1136,10 @@ enable_rollback_recording (Rollback recording) bool false
 #    @name, @message, @timestamp (optional)
 chat_message_format (Chat message format) string <@name> @message
 
+#    If the execution of a chat command takes longer than this specified time in
+#    seconds, add the time information to the chat command message
+chatcommand_msg_time_threshold (Chat command time message threshold) float 0.1
+
 #    A message to be displayed to all clients when the server shuts down.
 kick_msg_shutdown (Shutdown message) string Server shutting down.
 
-- 
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