function generateFolderTree() {

  try {

    // THIS IS THE TARGET SPREADSHEET NAME
    var ssName = "treeview";


    var ss = SpreadsheetApp.create(ssName);

    // If you want a tree of any sub folder

    var sheet = ss.getActiveSheet();
    // If you want to search from the top (root) folder
    //var parentFolder = DriveApp.getFoldersByName("Itembase Development").next();
    var parentFolder = DriveApp.getRootFolder();

    var parents = new Array();
    parents.push(parentFolder.getName());
    sheet.appendRow([parentFolder.getName(), parentFolder.getUrl()]);
    getChildFolders(parentFolder, parents, sheet);

  } catch (e) {

    Logger.log(e.toString());

  }

}


function getChildFolders(parent, parents, sheet) {

  var childFolders = parent.getFolders();

  while (childFolders.hasNext()) {

    var childFolder = childFolders.next();

    Logger.log("Folder Name: " + childFolder.getName());
    Logger.log("Folder URL:  " + childFolder.getUrl());

    // Recursive call for any sub-folders
    var subtree = new Array();
    for(var g = 0; g < parents.length; g++){
      subtree.push(parents[g]);
    }
    subtree.push(childFolder.getName());
    listFolderContents(childFolder, subtree, sheet);
    getChildFolders(childFolder, subtree, sheet);

  }

}


// replace your-folder below with the folder for which you want a listing
function listFolderContents(childFolder, subtree, sheet) {
  var files = childFolder.getFiles();

  var file;
  var name;
  var link;
  var row;
  while(files.hasNext()) {
    file = files.next();
    name = file.getName();
    link = file.getUrl();
    var row = new Array();
    var dirs = "";
    for(var g = 0; g < subtree.length; g++){
      dirs = dirs + " -> " + subtree[g];
    }
    row.push(dirs);
    row.push(name);
    row.push(link);
    Logger.log("Row: " + row);
    sheet.appendRow( row );
  }
};