apps/nekos/helpers/setup.lua

return function(a,u)
  local helper = { App = a, Conns = {}, User = u, Structure = {
    { Name = "Username", Filter = "[^(%a| )]" },
    { Name = "Password", Replacer = "*", Passthrough = function(s) return md5:hash(s) end }
  } }
  function helper:connect(e,c,t) self.Conns[#self.Conns+1]=self.App:connect(e,c,t or self) end
  function helper:destroy() self.User:save() for i,conn in ipairs(self.Conns) do self.App:disconnect(conn) end end
  function helper:build()
    self.Struct = { Value = nil, Index = 0 }
    self.Input = { Value = "", Index = 0, Line = 1 }
    self.User()
    self:connect("char",self.handleInput)
    self:connect("paste",self.handleInput)
    self:connect("key",self.handleKeyPressed)
    self:connect("timer",self.handleTimer)
    self.Timer = os.startTimer(0.25)
    self:nextStruct()
  end

  function helper:nextStruct()
    self.Struct.Index = self.Struct.Index + 1
    self.Struct.Value = self.Structure[self.Struct.Index]
    return self.Struct
  end

  function helper:draw()
    term.setCursorPos(1,self.Input.Line)
    term.clearLine()
    term.write(self.Struct.Value.Name.." > ")
    local x,_ = term.getCursorPos()
    local r = self.Struct.Value.Replacer
    term.write(r and string.gsub(self.Input.Value,".",r) or self.Input.Value)
    term.setCursorPos(x+self.Input.Index,self.Input.Line)
  end

  function helper:handleTimer(c)
    if c ~= self.Timer then return end
    shell.switchTab(1)
    self.Timer = os.startTimer(0.25)
  end

  function helper:handleInput(c)
    if not c then return
    elseif type(c) == "number" then
      local p = self.Input.Index + c
      self.Input.Value = string.sub(self.Input.Value,1,p-1)..string.sub(self.Input.Value,p+1,-1)
      if c <= 0 then self:moveCursor(c-1) end
    else
      self.Input.Value = string.sub(self.Input.Value,1,self.Input.Index)..c..string.sub(self.Input.Value,self.Input.Index+1,-1)
      self:moveCursor(string.len(c))
    end
  end

  function helper:processInput()
    self.Input.Index = 0
    local w,h = term.getSize()
    if self.Input.Index + 1 > h then
      term.scroll(h - self.Input.Line)
      self.Input.Line = self.Input.Line-1
    end
    self:draw()
    term.setCursorBlink(false)
    term.setCursorPos(1,self.Input.Line+1)
    term.clearLine()
    local f = self.Struct.Value.Filter
    if f then
      local m = string.match(self.Input.Value, f)
      if m then
        print("Invalid character '"..m.."' found.")
        return
      end
    end
    local p = self.Struct.Value.Passthrough
    self.User[self.Struct.Value.Name] = p and p(self.Input.Value) or self.Input.Value
    self.Input.Value = ""
    _,self.Input.Line = term.getCursorPos()
    term.setCursorBlink(true)
    if self.Struct.Index >= #self.Structure then return self.App:activate("login") end
    self:nextStruct()
  end

  function helper:moveCursor(c)
    self.Input.Index = self.Input.Index + c
    local l = string.len(self.Input.Value)
    if self.Input.Index < 0 then self.Input.Index = 0
    elseif self.Input.Index > l then self.Input.Index = l
    end
  end

  function helper:handleKeyPressed(key, held)
    if key == keys.backspace then self:handleInput(0)
    elseif key == keys.delete then self:handleInput(1)
    elseif not held then
      if key == keys.enter then self:processInput()
      elseif key == keys.left then self:moveCursor(-1)
      elseif key == keys.right then self:moveCursor(1)
      end
    end
  end

  return helper
end