gistfile1.scala

object Menus extends MyBsMenu

trait MyBsMenu extends SnippetHelper {

  /**
    * Produces a menu UL from a group, for use with Bootstrap.
    */
  def group = {
    val menus: NodeSeq =
      for {
        group <- S.attr("group") ?~ "Group not specified"
        sitemap <- LiftRules.siteMap ?~ "Sitemap is empty"
        request <- S.request ?~ "Request is empty"
        curLoc <- request.location ?~ "Current location is empty"
      } yield ({
        val currentClass = S.attr("current_class").openOr("active")
        sitemap.locForGroup(group) flatMap { loc =>
          val nonHiddenKids = loc.menu.kids.filterNot(_.loc.hidden)
          val styles =
            if (curLoc.name == loc.name || loc.menu.kids.exists(_.loc.name == curLoc.name)) currentClass
            else ""

          if (nonHiddenKids.length == 0) {
            <li class={styles+menuCss(loc)}>{buildLink(loc)}</li>
          } else {
            val dropdown: NodeSeq = nonHiddenKids.map { kid =>
              <li>{buildLink(kid.loc)}</li>
            }

            <li class={styles + " dropdown"}>
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">{loc.linkText.openOr(Text("Empty Name"))} <b class="caret"></b></a>
              <ul class="dropdown-menu">{ dropdown }</ul>
            </li>
          }
        }
      }): NodeSeq

    "* *" #> menus
  }


  def buildLink(loc: Loc[_]): NodeSeq = {
    val linkText = loc.linkText openOr Text(loc.name)
    val locIcons = findIcons(loc)
    val iconSpan = if (locIcons.size > 0) {
      <i class={locIcons.flatMap(_.cssIconClass).mkString(" ")}></i>
    } else NodeSeq.Empty
    <a href={loc.createDefaultLink}>{iconSpan}<span>&nbsp;{linkText}</span></a>
  }

  def findIcons(loc: Loc[_]): List[LocIcon] = loc.params.filter(p => p.isInstanceOf[LocIcon]).map(_.asInstanceOf[LocIcon])

  def menuCss(loc: Loc[_]): String = {
    loc.params.filter(p => p.isInstanceOf[ItemCss]).map(_.asInstanceOf[ItemCss]).map(_.css).mkString(" ")
  }
}