.js script to check ghosting status of a Craigslist post

craigslist.org.js

var MONTH_NAMES = [
  "Jan",
  "Feb",
  "Mar",
  "Apr",
  "May",
  "Jun",
  "Jul",
  "Aug",
  "Sep",
  "Oct",
  "Nov",
  "Dec"
];

var clMonthNameToInt = function (name) {
  // Most of these are guesses.
  return MONTH_NAMES.indexOf(name);
};

var intToClMonthName = function (int) {
  return MONTH_NAMES[int];
};

var nextIndexURL = function (indexURL) {
  var matcher = /index(\d{3,})\.html/,
      match;
  if (match = indexURL.match(matcher)) {
    return indexURL.replace(matcher, "index" + (parseInt(match[1])+100) + ".html");
  } else {
    return indexURL + "index100.html";
  }
};

var checkForListing = function (indexURL, postingURL, postedTime, dateSeenOnce) {
  console.log("Checking " + indexURL);
  if (!dateSeenOnce) { dateSeenOnce = false; }
  $.get(indexURL, function (content) {
    var links = $("a[href='" + postingURL + "']", content);
    var updatedTimeText = $("#messages", content).siblings("td").first().text();
    var updatedTimeMatcher = /[A-Za-z]{3},\s+(\d{1,2})\s+([A-Za-z]{3})\s+(\d{2}):(\d{2})/;
    var updatedTime, match, minUpdatedTime, matchingDates, dateString;
    if (match = updatedTimeText.match(updatedTimeMatcher)) {
      updatedTime = new Date((new Date()).getFullYear(),
                             clMonthNameToInt(match[2]),
                             match[1],
                             match[3],
                             match[4]);
    } else {
      throw "Couldn't get the time of the last index update!";
    }

    minUpdatedTime = new Date(postedTime.getFullYear(),
                              postedTime.getMonth(),
                              postedTime.getDate(),
                              postedTime.getHours(),
                              postedTime.getMinutes() + 20);

    if (updatedTime.getTime() < minUpdatedTime.getTime()) {
      $("#ghosting-status").text(" (Too soon to check ghosting)");
      title[0].style.color = 'gray';
      return;
    }

    dateString = intToClMonthName(postedTime.getMonth()) + " ";
    dateString += ((postedTime.getDate() < 10) ? "0" : "") + postedTime.getDate();
    matchingDates = $.grep($("h4", content), function (dateHeader, i) {
      return $(dateHeader).text().indexOf(dateString) >= 0;
    });

    console.log(matchingDates.length + " matching dates for " + dateString);

    if (matchingDates.length > 0) {
      links = $("a[href='" + postingURL + "']", content);

      if (links.length > 0) {
        $("#ghosting-status").text("\u2713");
        title[0].style.color = "green";
      } else {
        checkForListing(nextIndexURL(indexURL), postingURL, postedTime, true);
      }
    } else if (dateSeenOnce) {
      $("#ghosting-status").text(" (Ghosted)");
      title[0].style.color = 'red';
    } else {
      checkForListing(nextIndexURL(indexURL), postingURL, postedTime, true);
    }
  });
}

if (document.body.className === "posting") {
  var postingURL = document.location.href;
  var sectionURL = $(".bchead").children("a").last().attr("href");
  var title = $("h2").first();

  var postedTimeText = $("h2").siblings("hr").first()[0].nextSibling.data;
  var postedTimeMatcher = /(\d{4})-(\d{2})-(\d{2}),\s+(\d{1,2}):(\d{1,2})(PM|AM)/;
  var postedTime, match, hour;

  title.append("<span id='ghosting-status' style='color:black;font-style:italic;text-decoration:none;'/>");

  if (match = postedTimeText.match(postedTimeMatcher)) {
    hour = parseInt(match[4]);
    postedTime = new Date(match[1],
                          parseInt(match[2])-1,
                          match[3],
                          hour + ((match[6] === "PM" && hour !== 12) ? 12 : 0),
                          match[5]);
  } else {
    throw "Couldn't get the time of posting!";
  }

  checkForListing(sectionURL, postingURL, postedTime);
}