var xeditor = require("gulp-xml-editor");

/*
  edit XML document by using user specific object
*/
gulp.src("./manifest.xml")
  .pipe(xeditor([
    {path: '//name', text: 'new names'},
    {path: '//version', attr: {'major': '2'}}
  ]))
  .pipe(gulp.dest("./dest"));

/*
  edit XML document by using user specific object using a namespace
*/
gulp.src("./manifest.xml")
  .pipe(xeditor([
    {path: '//xmlns:name', text: 'new names'},
    {path: '//xmlns:version', attr: {'major': '2'}}
  ], 'http://www.w3.org/ns/widgets'))
  .pipe(gulp.dest("./dest"));


/*
  edit XML document by using user specific function
*/
gulp.src("./manifest.xml")
  .pipe(xeditor(function(xml, xmljs) {

    // 'xml' is libxmljs Document object.
    xml.get('//key[./text()="Version"]').nextElement().text('2.0.0');

    // 'xmljs' is libxmljs object. you can call any libxmljs function.
    var child = new xmljs.Element(xml, 'note');
    child.text('some text');
    xml.get('//description').addChild(child);

    // must return libxmljs Document object.
    return xml;
  }))
  .pipe(gulp.dest("./dest"));

// to modify(or add) the text of the element
{path: 'xpath to the element', text: 'new text value'}

// to modify(or add) a attribute of the element
{path: 'xpath to the element', attr: {'attrName': 'attrValue'}}

// to modify(or add) some attributes of the element
{path: 'xpath to the element', attrs: [
  {'attrName1': 'attrValue1'},
  {'attrName2': 'attrValue2'}
]}