Count Characters in Selection.sketchplugin

var total_chars = 0

for (var i=0; i < [selection length]; i++){
  var s = [selection objectAtIndex:i]
  try {
    total_chars += [[s stringValue] length]
  } catch (e) {
    log(e)
  }
}

[doc showMessage:"" + total_chars + " characters in selected layer" + ([selection count] > 1 ? "s" : "")]