twitter_screenshot.js

// Takes a screenshot from a given Tweet.
// Usage: phantomjs twitter_screenshot.js https://twitter.com/Snowden/status/777557723118440448

var system = require("system"),
    args   = system.args;

var url = args[1];

if (!url) {
  console.log("Please provide the URL to a Tweet.");
  phantom.exit(1);
}


var resourceWait  = 300,
    maxRenderWait = 8000;

var page  = require("webpage").create(),
    count = 0,
    renderTimeout;

page.viewportSize = { width: 1280, height: 1200 };

function getTweetDimensions() {
  return page.evaluate(function() {
    var tweet  = $(".permalink-tweet-container"),
        offset = tweet.offset();

    return {
      top:    offset.top     + 5,
      left:   offset.left    + 5,
      width:  tweet.width()  - 10,
      height: tweet.height() - 10
    }
  });
}

function getFilename() {
  var split = url.split("/"),
      user  = split[3],
      id    = split[5];

  return user + "_" + id + ".png";
}

function screenshot() {
  var filename = getFilename();

  page.clipRect = getTweetDimensions();
  page.render(filename);

  console.log("Screenshot saved to " + filename);

  phantom.exit();
}

page.onResourceRequested = function(req) {
  count += 1;
  clearTimeout(renderTimeout);
};

page.onResourceReceived = function(res) {
  if (!res.stage || res.stage === "end") {
    count -= 1;

    if (count === 0) {
      renderTimeout = setTimeout(function() {
        console.log("All resources loaded.");
        screenshot();
      }, resourceWait);
    }
  }
};

console.log("Loading " + url);

page.open(url, function(status) {
  if (status !== "success") {
    console.log("Unable to load url. Status: " + status);
    phantom.exit(1);
  } else {
    console.log("Waiting for resources to load.");

    setTimeout(function() {
      console.log("Timeout. Not all resources could be loaded.");
      screenshot();
    }, maxRenderWait);
  }
});