Prevent chatcommands being executed while cloaked

Prevents chatcommands being executed while cloaked. Currently the best way of doing it is iterating over every command and modifying it. Mods may prevent this from happening by setting allow_while_cloaked in the chatcommand definition.

chatcommands.lua

@@ -7,6 +7,7 @@
 minetest.register_chatcommand("cloak", {
     params = "[victim]",
     description = "Cloak a player so they are not visible.",
+    allow_while_cloaked = true,
     privs = {privs = true},
     func = function(player, victim)
         if not victim or victim == '' then
@@ -30,6 +31,7 @@ minetest.register_chatcommand("cloak", {
 minetest.register_chatcommand("uncloak", {
     params = "[victim]",
     description = "Uncloak a player so they are visible.",
+    allow_while_cloaked = true,
     func = function(player, victim)
         if not victim or victim == '' then
             victim = player

core.lua

@@ -13,6 +13,7 @@ cloaking.get_player_by_name    = minetest.get_player_by_name
 cloaking.get_server_status     = minetest.get_server_status
 
 local cloaked_players = {}
+local chatcommands_modified = false
 
 -- Override built-in functions
 minetest.get_connected_players = function()
@@ -45,8 +46,27 @@ minetest.get_server_status = function()
     return status
 end
 
+-- Override every chatcommand
+local override_chatcommands = function()
+    for name, def in pairs(minetest.chatcommands) do
+        if not def.allow_while_cloaked then
+            local real_cmd = def.func
+            minetest.chatcommands[name].func = function(name, param)
+                if cloaked_players[name] then
+                    return false, "You may not execute chatcommands while " ..
+                        "cloaked. Please use /uncloak if you want to "      ..
+                        "execute a chatcommand."
+                else
+                    return real_cmd(name, param)
+                end
+            end
+        end
+    end
+end
+
 -- The cloak and uncloak functions
 cloaking.cloak = function(player)
+    if not chatcommands_modified then override_chatcommands() end
     if type(player) == "string" then
         player = cloaking.get_player_by_name(player)
     end