add menu to exec script

menu.lua

@@ -0,0 +1,94 @@
+MainMenu = {}
+
+local function getSizeOfScreen()
+    local x, y = term.getSize()
+    return x, y
+end
+
+local function initMenu()
+    -- do a menu for computer craft
+    local menuItems = {
+        { name = "Get Method", action = function() shell.run("getMethodsPeripheral") end },
+        { name = "Settings",   action = function() print("Opening settings...") end },
+        { name = "Exit",       action = function() print("Exiting...") end }
+    }
+    -- put the item in MainMenu
+    for _, item in ipairs(menuItems) do
+        table.insert(MainMenu, item)
+    end
+end
+
+
+local function displayMenu()
+    local selected = 1
+    local function drawTitle()
+        local x, y = getSizeOfScreen()
+        local title = " Main Menu "
+        term.setTextColor(colors.yellow)
+        local decorator = '='
+        term.write(string.rep(decorator, math.floor((x - #title) / 2)))
+        term.setCursorPos(math.floor((x - #title) / 2) + 1, 1)
+        print(title)
+        term.setCursorPos(math.floor((x + #title) / 2) + 1, 1)
+        term.write(string.rep(decorator, math.ceil((x - #title) / 2)))
+        term.setTextColor(colors.white)
+        term.write(string.rep(decorator, x))
+    end
+
+    local function drawMenuItems(selected)
+        for i, item in ipairs(MainMenu) do
+            term.setCursorPos(1, i + 2)
+            if i == selected then
+                term.setTextColor(colors.yellow)
+            else
+                term.setTextColor(colors.white)
+            end
+            -- put the item in the center and add [ ] before item
+            local itemText = string.format("[%s] %s", i == selected and ">" or " ", item.name)
+            local x, _ = getSizeOfScreen()
+            local padding = math.max(0, (x - #itemText) / 2)
+            term.write(string.rep(" ", padding) .. itemText)
+            term.setCursorPos(1, i + 2)
+            term.write(string.rep(" ", x - padding - #itemText))
+            term.setCursorPos(1, i + 2)
+            term.setTextColor(colors.white)
+        end
+    end
+
+    local function handleKey(selected)
+        local event, key = os.pullEvent("key")
+        if key == keys.up then
+            selected = selected - 1
+            if selected < 1 then selected = #MainMenu end
+        elseif key == keys.down then
+            selected = selected + 1
+            if selected > #MainMenu then selected = 1 end
+        elseif key == keys.enter then
+            term.setTextColor(colors.white)
+            term.clear()
+            term.setCursorPos(1, 1)
+            MainMenu[selected].action()
+            return selected, true
+        end
+        return selected, false
+    end
+
+    while true do
+        term.clear()
+        term.setCursorPos(1, 1)
+        drawTitle()
+        term.setTextColor(colors.white)
+        term.setCursorPos(1, 3)
+        drawMenuItems(selected)
+        selected, done = handleKey(selected)
+        if done then break end
+    end
+    term.setTextColor(colors.white)
+end
+
+function Main()
+    initMenu()
+    displayMenu()
+end
+
+Main()