[Golang] Terminal Current Directory Item List via termui

package main

import (
      "github.com/gizak/termui"
      "io/ioutil"
      "strings"
)

type ViewState struct {
      ItemSelect int
}

func addColor(str, color string) string {
      return "[" + str + "](" + color + ")"
}

func removeColor(str string) string {
      if !strings.HasPrefix(str, "[") {
              return str
      }
      if !strings.HasSuffix(str, ")") {
              return str
      }
      if !strings.Contains(str, "](") {
              return str
      }
      return strings.Split(str, "](")[0][1:]
}

func isDir(str string) bool {
      if strings.Contains(str, "fg-blue") {
              return true
      }
      return false
}

func setDirColor(str string) string {
      return addColor(str, "fg-blue")
}

func setSelectedColor(str string) string {
      colorBg := "bg-yellow"
      if isDir(str) {
              text := removeColor(str)
              return addColor(text, "fg-blue,"+colorBg)
      }
      text := removeColor(str)
      return addColor(text, colorBg)
}

func removeSelectedColor(str string) string {
      if isDir(str) {
              return setDirColor(removeColor(str))
      }
      return removeColor(str)
}

func getDirEntries(dirpath string) (entries []string) {
      files, err := ioutil.ReadDir(dirpath)
      if err != nil {
              return
      }

      entries = append(entries, setDirColor(".."))
      for _, file := range files {
              if file.IsDir() {
                      entries = append(entries, setDirColor(file.Name()))
              } else {
                      entries = append(entries, file.Name())
              }
      }
      return
}

func main() {
      err := termui.Init()
      if err != nil {
              panic(err)
      }
      defer termui.Close()

      strs := getDirEntries(".")

      ls := termui.NewList()
      ls.Items = strs
      ls.ItemFgColor = termui.ColorWhite
      ls.BorderLabel = "Directory View"
      ls.Height = 12
      ls.Width = 25
      ls.Y = 0

      vs := ViewState{
              ItemSelect: 0,
      }
      ls.Items[vs.ItemSelect] = setSelectedColor(ls.Items[vs.ItemSelect])

      termui.Render(ls)
      termui.Handle("/sys/kbd/q", func(termui.Event) {
              termui.StopLoop()
      })
      termui.Handle("/sys/kbd/<up>", func(termui.Event) {
              ls.Items[vs.ItemSelect] = removeSelectedColor(ls.Items[vs.ItemSelect])
              vs.ItemSelect--
              if vs.ItemSelect < 0 {
                      vs.ItemSelect = 0
              }
              ls.Items[vs.ItemSelect] = setSelectedColor(ls.Items[vs.ItemSelect])
              termui.Render(ls)
      })
      termui.Handle("/sys/kbd/<down>", func(termui.Event) {
              ls.Items[vs.ItemSelect] = removeSelectedColor(ls.Items[vs.ItemSelect])
              vs.ItemSelect++
              if vs.ItemSelect == len(ls.Items) {
                      vs.ItemSelect = len(ls.Items) - 1
              }
              ls.Items[vs.ItemSelect] = setSelectedColor(ls.Items[vs.ItemSelect])
              termui.Render(ls)
      })

      termui.Loop()
}