code: function buildUrl(value, options, file) {
    const [gist] = value.split(/[?#]/);
  
    const [inlineUsername, id] =
      gist.indexOf("/") > 0 ? gist.split("/") : [null, gist];
  
    // username can come from inline code or options
    const username = inlineUsername || options.username;
  
    // checks for a valid username
    if (username == null || username.trim().length === 0) {
      throw new Error("Missing username information");
    }
  
    // checks for a valid id
    if (id == null || id.trim().length === 0) {
      throw new Error("Missing gist id information");
    }
  
    // builds the url and completes it with the file if any
    let url = `${baseUrl}/${username}/${id}.json`;
    if (file != null) {
      url += `?file=${file}`;
    }
  
    return url;
  }
docs: Builds the gist url.
  @param {string} value the value of the inlineCode block.
  @param {PluginOptions} options the options of the plugin.
  @param {string} file the file to be loaded.
  @returns {string} the gist url.