From 0190f9b077dcb2b8cb41c622dd91ffc1e04dacac Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Thu, 26 Jul 2012 22:06:45 +0300
Subject: Experimental-ish rollback functionality

---
 builtin/chatcommands.lua | 72 ++++++++++++++++++++++++++++++++++++++++++++++++
 builtin/privileges.lua   |  2 +-
 2 files changed, 73 insertions(+), 1 deletion(-)

(limited to 'builtin')

diff --git a/builtin/chatcommands.lua b/builtin/chatcommands.lua
index da9e6c78c..49ae8c633 100644
--- a/builtin/chatcommands.lua
+++ b/builtin/chatcommands.lua
@@ -496,3 +496,75 @@ minetest.register_chatcommand("pulverize", {
 	end,
 })
 
+-- Key = player name
+minetest.rollback_punch_callbacks = {}
+
+minetest.register_on_punchnode(function(pos, node, puncher)
+	local name = puncher:get_player_name()
+	if minetest.rollback_punch_callbacks[name] then
+		minetest.rollback_punch_callbacks[name](pos, node, puncher)
+		minetest.rollback_punch_callbacks[name] = nil
+	end
+end)
+
+minetest.register_chatcommand("rollback_check", {
+	params = "[<range>] [<seconds>]",
+	description = "check who has last touched a node or near it, "..
+			"max. <seconds> ago (default range=0, seconds=86400=24h)",
+	privs = {rollback=true},
+	func = function(name, param)
+		local range, seconds = string.match(param, "(%d+) *(%d*)")
+		range = tonumber(range) or 0
+		seconds = tonumber(seconds) or 86400
+		minetest.chat_send_player(name, "Punch a node (limits set: range="..
+				dump(range).." seconds="..dump(seconds).."s)")
+		minetest.rollback_punch_callbacks[name] = function(pos, node, puncher)
+			local name = puncher:get_player_name()
+			local actor, act_p, act_seconds =
+					minetest.rollback_get_last_node_actor(pos, range, seconds)
+			if actor == "" then
+				minetest.chat_send_player(name, "Nobody has touched the "..
+						"specified location in "..dump(seconds).." seconds")
+				return
+			end
+			local nodedesc = "this node"
+			if act_p.x ~= pos.x or act_p.y ~= pos.y or act_p.z ~= pos.z then
+				nodedesc = minetest.pos_to_string(act_p)
+			end
+			minetest.chat_send_player(name, "Last actor on "..nodedesc.." was "..
+					actor..", "..dump(act_seconds).."s ago")
+		end
+	end,
+})
+
+minetest.register_chatcommand("rollback", {
+	params = "<player name> [<seconds>] | :liquid [<seconds>]",
+	description = "revert actions of a player; default for <seconds> is 60",
+	privs = {rollback=true},
+	func = function(name, param)
+		local target_name, seconds = string.match(param, ":([^ ]+) *(%d*)")
+		if not target_name then
+			local player_name = nil;
+			player_name, seconds = string.match(param, "([^ ]+) *(%d*)")
+			if not player_name then
+				minetest.chat_send_player(name, "Invalid parameters. See /help rollback and /help rollback_check")
+				return
+			end
+			target_name = "player:"..player_name
+		end
+		seconds = tonumber(seconds) or 60
+		minetest.chat_send_player(name, "Reverting actions of "..
+				dump(target_name).." since "..dump(seconds).." seconds.")
+		local success, log = minetest.rollback_revert_actions_by(
+				target_name, seconds)
+		for _,line in ipairs(log) do
+			minetest.chat_send_player(name, line)
+		end
+		if success then
+			minetest.chat_send_player(name, "Reverting actions succeeded.")
+		else
+			minetest.chat_send_player(name, "Reverting actions FAILED.")
+		end
+	end,
+})
+
diff --git a/builtin/privileges.lua b/builtin/privileges.lua
index 6cb42c103..9ec09d7f6 100644
--- a/builtin/privileges.lua
+++ b/builtin/privileges.lua
@@ -44,5 +44,5 @@ minetest.register_privilege("fast", {
 	description = "Can walk fast using the fast_move mode",
 	give_to_singleplayer = false,
 })
-
+minetest.register_privilege("rollback", "Can use the rollback functionality")
 
-- 
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