add menu to newdesign

src/main.lua

@@ -90,10 +90,15 @@ local function newdesign()
                 end
             end
         end
+        term.setcol(colors.yellow, colors.black)
+        local _,y = term.getSize()
+        term.setCursorPos(1,y)
+        term.write("Press Ctrl for menu.")
 
         -- user input
         local event = table.pack(os.pullEvent())
-        if (event[1] == "mouse_click" or event[1] == "mouse_drag") and event[3] > 0 and event[3] <= dimensions["x"] and event[4] > 0 and event[4] <= dimensions["z"] then
+        if event[1] == "mouse_click" or event[1] == "mouse_drag" then
+            if event[3] <= dimensions["x"] and event[4] <= dimensions["z"] then
                 if event[2] == 1 then -- left button, set
                     buf[posasstring(event[3], currentfloor, event[4])] = true
                 end
@@ -102,6 +107,44 @@ local function newdesign()
                 end
             end
         end
+        if event[1] == "key" and keys.getName(event[2]) == "leftCtrl" then -- menu
+            local action = selopt({
+                "Save",
+                "Load",
+                "Exit",
+                "Change X size",
+                "Change floor amount",
+                "Change Z size"
+            }, "menu")
+            if action == 3 then return end -- exit
+            if action == 1 then -- save
+                reset()
+                write("Enter name: ")
+                local name = read()
+                local file = fs.open("designs/"..name, "w")
+                file.write(textutils.serialiseJSON({
+                    ["dimensions"] = dimensions,
+                    ["buf"] = buf
+                }))
+                file.close()
+            end
+            if action == 2 then -- load
+                reset()
+                write("Enter name: ")
+                local name = read()
+                if not fs.exists("designs/"..name) then
+                    printError("Design not found!")
+                else
+                    local file = fs.open("designs/"..name, "r")
+                    local content = file.readAll()
+                    file.close()
+                    content = textutils.unserialiseJSON(content)
+                    dimensions = content["dimensions"]
+                    buf = content["buf"]
+                end
+            end
+        end
+    end
 end
 
 while true do