Select text using specified font.sketchplugin

var doc = doc || context.document,
    selection = selection || context.selection

var font_name = [doc askForUserInput:"Font name starts with:" initialValue:"OpenSans"]

function check_layer(layer){
  var klass = [layer className]
  //log("Checking layer " + layer + " of klass: " + klass)
  if (klass == "MSTextLayer") {
    // This log here will show you all the fonts you use in your document
    log("Found text layer w/font: " + [layer fontPostscriptName])
    // This checks if the fontPostscriptName starts with font_name, so you'll catch OpenSans-Bold too, for example
	if ([layer fontPostscriptName].lastIndexOf(font_name, 0) === 0) {
      log("  Selected!")
      [layer select:true byExpandingSelection:true]
    }
  }
  if ( klass == "MSPage" || klass == "MSLayerGroup" || klass == "MSArtboardGroup" ){
    var sublayers = [layer layers]
    //log("This is a group/artboard/page with " + [sublayers count] + " sublayers")
    for(var i=0; i < [sublayers count]; i++) {
      var sublayer = [sublayers objectAtIndex:i]
      check_layer(sublayer);
    }
  }
}

log("################################################################")

// Use selection, if any
if(selection && [selection count]){
  for (var i = 0; i < [selection count]; i++) {
    check_layer([selection objectAtIndex:i])
  }
} else {
  // Otherwise, loop trough pages, artboards & layers
  var pages = [doc pages]
  for (var i = 0; i < [pages count]; i++) {
    var current_page = [pages objectAtIndex:i],
        artboards = [current_page artboards]
    [current_page deselectAllLayers]
    if ([artboards count]) {
      //log("Traversing artboards")
      for (var i = 0; i < [artboards count]; i++) {
        var artboard = [artboards objectAtIndex:i]
        check_layer(artboard)
      }
    } else {
      //log("Page has no artboards")
      check_layer(current_page)
    }
  }
}