$(document).ready(function() {
  $.get("/ja/about/archives/atom.xml", feedLoadedCallback);
});

  function feedLoadedCallback(data) {
    var html = "";
    var count = 0;
    $(data).find("entry").each(function() {
      if (count > 5) {
        return;
      }
      var title = $(this).find("title").text();
      var date = formatDate($(this).find("published").text());
      var link = $(this).find("link").attr("href");
      html += '<div class="entry';
      if (count%2 == 0) {
        html += " bg";
      }
      html += '">';
      html += '<a href="' + link + '">';
      html += title
      html += '</a>';
      html += '<span class="date">';
      html += date;
      html += '</span>';
      html += '</div>';
      count ++;
    });
    $("#topicsSummary").html(html);
  }

  function formatDate(str) {
    var y = str.substring(0, 4);
    var m = removePrefixZero(str.substring(5, 7));
    var d = removePrefixZero(str.substring(8, 10));
    return y + "年" + m + "月" + d + "日";
  }

  function removePrefixZero(str) {
    if (str.indexOf("0") == 0) {
      return str.substring(1);
    }
    return str;
  }