<?php
  if (has_category('chapters')) {
    $romans = get_the_terms($post->ID, 'roman');
    foreach( $romans as $roman ) {
      echo "<a href= '" . esc_url( get_category_link( $roman->term_id ) ) . "' class='btn-small btn-primary'><i class='fa fa-book'></i> " . $roman->name . "</a>";
    }
  } else {
    $categories = get_the_category();
    foreach( $categories as $category ) {
      echo "<a href= '" . esc_url( get_category_link( $category->term_id ) ) . "' class='btn-small btn-primary'><i class='fa fa-folder'></i> " . $category->cat_name . "</a>";
    }
  }
  $tags = get_the_tags();
  if ($tags) {
    foreach( $tags as $tag ) {
      echo "<a href= '" . esc_url( get_tag_link( $tag->term_id ) ) . "' class='btn-small btn-secondary'><i class='fa fa-tag'></i> " . $tag->name . "</a> ";
    }
  }
?>