Replace Font.sketchplugin

// Change font
// This plugin changes the font family of the selected text layers (or all the text layers in the document, if there's no selection)

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

var font_name = [doc askForUserInput:"Font name:" initialValue:"Arial"]

function check_layer(layer){
  var klass = [layer className]
  // log("Checking layer " + layer + " of klass: " + klass)
  if (klass == "MSTextLayer") {
    // log("Found text layer!")
    var font = NSFont.fontWithName_size(font_name, layer.fontSize())
    layer.setFont(font)
    layer.syncTextStyleAttributes()
    layer.adjustFrameToFit()
  }
  if ( klass == "MSPage" || klass == "MSLayerGroup" || klass == "MSArtboardGroup" || klass == "MSSymbolMaster" || klass == "MSSymbolInstance"){
    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]
    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)
    }
    // Also traverse layers not on an artboard:
    var layers = current_page.layers()
    for (var l=0; l < [layers count]; l++) {
      var currentLayer = [layers objectAtIndex:l]
      check_layer(currentLayer)
    }
  }
}