better math and usage check change

README.md

@@ -1,6 +1,9 @@
 # minetest-toolranks
 Minetest tool ranks mod
 
+## Original mod by lisacvuk
+https://github.com/lisacvuk/minetest-toolranks
+
 Tool gains levels for digging nodes. Higher level tools take longer to
 wear out.
 

init.lua

@@ -19,18 +19,18 @@ end
 
 function toolranks.get_level(uses)
 
-	if uses < 200 then
-		return 1
-	elseif uses < 400 then
-		return 2
-	elseif uses < 1000 then
-		return 3
-	elseif uses < 2000 then
-		return 4
-	elseif uses < 3200 then
-		return 5
-	else
+	if uses >= 3200 then
 		return 6
+	elseif uses >= 2000 then
+		return 5
+	elseif uses >= 1000 then
+		return 4
+	elseif uses >= 400 then
+		return 3
+	elseif uses >= 200 then
+		return 2
+	else
+		return 1
 	end
 end
 
@@ -94,7 +94,7 @@ function toolranks.new_afteruse(itemstack, user, node, digparams)
 
 	-- Set wear level
 	if level > 1 then
-		wear = digparams.wear / (1 + level / 4)
+		wear = digparams.wear * 4 / (4 + level)
 	end
 
 	itemstack:add_wear(wear)

license.txt

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2018
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.