Added initial version from zip.

init.lua

@@ -0,0 +1,87 @@
+hacktool={}
+
+hacktool.gui=function(itemstack, user, pointed_thing)
+	if pointed_thing.type~="object" then return end
+	local player=pointed_thing.ref
+	if player:is_player()==false then return end
+	hacktool.tmp={}
+	hacktool.tmp=player
+	local inv=player:get_inventory()
+	local gui="size[8,4]"
+	local x=0
+	local y=0
+
+	for i=1,32,1 do
+		gui=gui .."item_image_button[" .. x ..",".. y.. ";1,1;".. inv:get_stack("main",i):get_name() ..";inv" .. i ..";\n\n\b\b\b" .. inv:get_stack("main",i):get_count() .."]"
+		x=x+1
+		if x>=8 then
+			x=0
+			y=y+1
+		end
+	end
+	minetest.after((0.1), function(gui)
+		return minetest.show_formspec(user:get_player_name(), "invhack.form",gui)
+	end, gui)
+end
+
+minetest.register_privilege("invhack", {
+	description = "Let you hack players inventory",
+	give_to_singleplayer= true,
+})
+
+
+
+minetest.register_on_player_receive_fields(function(player, form, pressed)
+	if form=="invhack.form" then
+		local name=player:get_player_name()
+		local n=0
+
+		if pressed.quit then
+			if hacktool.tmp then hacktool.tmp=nil end
+			return
+		end
+
+		if not minetest.check_player_privs(name, {invhack=true}) then
+			minetest.chat_send_player(name, "Missing privilege: invhack")
+			return
+		end
+
+		if hacktool.tmp==nil or hacktool.tmp:is_player()~=true then
+			hacktool.tmp=nil
+			minetest.chat_send_player(name, "The tempoary variable is empty or the player offline")
+			return
+		end
+
+		for i=1,32,1 do
+			n=i
+			if pressed["inv" .. i] then break end
+		end
+		if pressed["inv" .. n] then 
+			local pinv=hacktool.tmp:get_inventory()
+			local uinv=player:get_inventory()
+			local stack=pinv:get_stack("main",n)
+			local n2=0
+			local f=true
+			for i=1,32,1 do
+				n2=i
+				if uinv:get_stack("main",i):get_count()==0 then f=false break end
+			end
+			if f then minetest.chat_send_player(name, "Error: Your inventory is full") return end
+			uinv:set_stack("main",n2,stack)
+			pinv:set_stack("main",n,nil)
+		end
+	end
+end)
+
+
+
+minetest.register_tool("invhack:tool", {
+	description = "Inventory hack tool",
+	range = 15,
+	inventory_image = "hacktool_inv.png",
+	groups = {not_in_creative_inventory=1},
+	on_use = function(itemstack, user, pointed_thing)
+		hacktool.gui(itemstack, user, pointed_thing)
+	return itemstack
+	end,
+})

readme.txt

@@ -0,0 +1,8 @@
+Licenses: CC0
+
+See https://forum.minetest.net/viewtopic.php?t=12440
+
+See and or take items from players main inventory.
+The invhack privilege requires to take items.
+
+Tool: invhack:tool