refactoring

util/sort.lua

@@ -1,39 +1,16 @@
-local private, public = {}, {}
-Aux.sort = public
+local m, private, public = Aux.module'sort'
 
 public.LT = {}
 public.EQ = {}
 public.GT = {}
 
-function public.invert_order(ordering)
-    if ordering == public.LT then
-        return public.GT
-    elseif ordering == public.GT then
-        return public.LT
-    else
-        return public.EQ
-    end
-end
-
 function public.compare(a, b, desc)
     if a < b then
-        return desc and public.GT or public.LT
+        return desc and m.GT or m.LT
     elseif a > b then
-        return desc and public.LT or public.GT
+        return desc and m.LT or m.GT
     else
-        return public.EQ
-    end
-end
-
-function public.compare_from_lt(lt)
-    return function(a, b)
-        if lt(a, b) then
-            return public.LT
-        elseif lt(b, a) then
-            return public.GT
-        else
-            return public.EQ
-        end
+        return m.EQ
     end
 end