Add custom operators (Part 1)

src/common.lua

@@ -103,7 +103,7 @@ local function search(data)
 						temp[item] = true
 					end
 
-					j = j + 1
+					j++
 				end
 			end
 		else
@@ -122,7 +122,7 @@ local function search(data)
 		end
 
 		if to_add then
-			c = c + 1
+			c++
 			filtered_list[c] = item
 		end
 	end
@@ -150,7 +150,7 @@ local function table_merge(t1, t2, hash)
 		local c = #t1
 
 		for i = 1, #t2 do
-			c = c + 1
+			c++
 			t1[c] = t2[i]
 		end
 	end
@@ -176,7 +176,7 @@ local function array_diff(t1, t2)
 	for i = 1, #t1 do
 		local v = t1[i]
 		if hash[v] then
-			c = c + 1
+			c++
 			diff[c] = v
 		end
 	end
@@ -377,7 +377,7 @@ local function craft_stack(player, data, craft_rcp)
 				if item == _name and remaining > 0 then
 					local c = min(remaining, _count)
 					items[item] = c
-					remaining = remaining - c
+					remaining -= c
 				end
 
 				if remaining == 0 then break end
@@ -398,7 +398,7 @@ local function craft_stack(player, data, craft_rcp)
 		local c = min(stackmax, leftover)
 		local stack = ItemStack(fmt("%s %s", stackname, c))
 		get_stack(player, stack)
-		leftover = leftover - stackmax
+		leftover -= stackmax
 	end
 end
 
@@ -414,7 +414,7 @@ local function safe_teleport(player, pos)
 	player:add_velocity(vec_mul(vel, -1))
 
 	local p = vec_new(pos)
-	      p.y = p.y + 0.25
+	      p.y += 0.25
 
 	player:set_pos(p)
 end
@@ -486,7 +486,7 @@ local function compress_items(list, start_i)
 				insert(special, stack)
 			else
 				hash[name] = hash[name] or 0
-				hash[name] = hash[name] + count
+				hash[name] += count
 			end
 		end
 	end
@@ -498,7 +498,7 @@ local function compress_items(list, start_i)
 
 		for _ = 1, iter do
 			insert(new_inv, ItemStack(fmt("%s %u", name, min(stackmax, leftover))))
-			leftover = leftover - stackmax
+			leftover -= stackmax
 		end
 	end