6 files changed, 475 insertions, 290 deletions

@@ -1,18 +1,15 @@
 cmake_minimum_required (VERSION 3.1)
 project (difference)
 
-set(CMAKE_BUILD_TYPE Debug)
-
 add_subdirectory(vendor/libtwittercpp)
 add_subdirectory(vendor/verbly)
 add_subdirectory(vendor/yaml-cpp EXCLUDE_FROM_ALL)
 
 find_package(PkgConfig)
-pkg_check_modules(sqlite3 sqlite3 REQUIRED)
 pkg_check_modules(GraphicsMagick GraphicsMagick++ REQUIRED)
 
-include_directories(vendor/libtwittercpp/src vendor/libtwittercpp/vendor/curlcpp/include ${sqlite3_INCLUDE_DIR} vendor/verbly/lib ${GraphicsMagick_INCLUDE_DIRS} vendor/yaml-cpp/include)
-add_executable(difference difference.cpp)
+include_directories(vendor/libtwittercpp/src vendor/libtwittercpp/vendor/curlcpp/include vendor/verbly/lib ${GraphicsMagick_INCLUDE_DIRS} vendor/yaml-cpp/include)
+add_executable(difference difference.cpp main.cpp)
 set_property(TARGET difference PROPERTY CXX_STANDARD 11)
 set_property(TARGET difference PROPERTY CXX_STANDARD_REQUIRED ON)
-target_link_libraries(difference verbly ${sqlite3_LIBRARIES} yaml-cpp twitter++ ${GraphicsMagick_LIBRARIES})
+target_link_libraries(difference verbly yaml-cpp twitter++ ${GraphicsMagick_LIBRARIES})
@@ -1,344 +1,439 @@
-#include <verbly.h>
-#include <twitter.h>
+#include "difference.h"
 #include <curl_easy.h>
 #include <curl_header.h>
-#include <list>
-#include <set>
 #include <vector>
-#include <algorithm>
-#include <Magick++.h>
 #include <iostream>
 #include <yaml-cpp/yaml.h>
 #include <chrono>
 #include <thread>
-#include <random>
+#include <deque>
 
-std::string capitalize(std::string input)
+difference::difference(
+  std::string configFile,
+  std::mt19937& rng) :
+    rng_(rng)
 {
-  std::string result;
-  bool capnext = true;
-  
-  for (auto ch : input)
+  // Load the config file.
+  YAML::Node config = YAML::LoadFile(configFile);
+
+  // Set up the Twitter client.
+  twitter::auth auth;
+  auth.setConsumerKey(config["consumer_key"].as<std::string>());
+  auth.setConsumerSecret(config["consumer_secret"].as<std::string>());
+  auth.setAccessKey(config["access_key"].as<std::string>());
+  auth.setAccessSecret(config["access_secret"].as<std::string>());
+
+  client_ = std::unique_ptr<twitter::client>(new twitter::client(auth));
+
+  // Set up the verbly database.
+  database_ = std::unique_ptr<verbly::database>(
+    new verbly::database(config["verbly_datafile"].as<std::string>()));
+
+  fontfile_ = "@" + config["font"].as<std::string>();
+}
+
+void difference::run() const
+{
+  for (;;)
   {
-    if (capnext)
+    std::cout << "Generating tweet..." << std::endl;
+
+    try
     {
-      result += toupper(ch);
-      capnext = false;
-    } else {
-      result += ch;
+      // Find a noun to use as the pictured item.
+      std::cout << "Choosing pictured noun..." << std::endl;
+
+      verbly::word pictured = getPicturedNoun();
+
+      std::cout << "Noun: " << pictured.getBaseForm().getText() << std::endl;
+
+      // Choose two pictures of that noun.
+      std::cout << "Finding an image..." << std::endl;
+
+      Magick::Image image1;
+      Magick::Image image2;
+      std::tie(image1, image2) = getImagesForNoun(pictured);
+
+      // Choose two opposite words.
+      std::cout << "Choosing two opposite words..." << std::endl;
+
+      verbly::word word1;
+      verbly::word word2;
+      std::tie(word1, word2) = getOppositeIdentifiers();
+
+      // Compose the images and words.
+      std::cout << "Composing image..." << std::endl;
+
+      Magick::Image image = composeImage(
+        std::move(image1),
+        word1,
+        std::move(image2),
+        word2);
+
+      // Generate the tweet text.
+      std::cout << "Generating text..." << std::endl;
+
+      std::string text = generateTweetText(std::move(word1), std::move(word2));
+
+      std::cout << "Tweet text: " << text << std::endl;
+
+      // Send the tweet.
+      std::cout << "Sending tweet..." << std::endl;
+
+      sendTweet(std::move(text), std::move(image));
+
+      std::cout << "Tweeted!" << std::endl;
+
+      // Wait.
+      std::this_thread::sleep_for(std::chrono::hours(1));
+    } catch (const could_not_get_images& ex)
+    {
+      std::cout << ex.what() << std::endl;
+    } catch (const Magick::ErrorImage& ex)
+    {
+      std::cout << "Image error: " << ex.what() << std::endl;
+    } catch (const Magick::ErrorCorruptImage& ex)
+    {
+      std::cout << "Corrupt image: " << ex.what() << std::endl;
+    } catch (const twitter::twitter_error& ex)
+    {
+      std::cout << "Twitter error: " << ex.what() << std::endl;
+
+      std::this_thread::sleep_for(std::chrono::hours(1));
     }
-    
-    if ((ch == ' ') || (ch == '-'))
+
+    std::cout << std::endl;
+  }
+}
+
+verbly::word difference::getPicturedNoun() const
+{
+  verbly::filter whitelist =
+    (verbly::notion::wnid == 109287968)    // Geological formations
+    || (verbly::notion::wnid == 109208496) // Asterisms (collections of stars)
+    || (verbly::notion::wnid == 109239740) // Celestial bodies
+    || (verbly::notion::wnid == 109277686) // Exterrestrial objects (comets and meteroids)
+    || (verbly::notion::wnid == 109403211) // Radiators (supposedly natural radiators but actually these are just pictures of radiators)
+    || (verbly::notion::wnid == 109416076) // Rocks
+    || (verbly::notion::wnid == 105442131) // Chromosomes
+    || (verbly::notion::wnid == 100324978) // Tightrope walking
+    || (verbly::notion::wnid == 100326094) // Rock climbing
+    || (verbly::notion::wnid == 100433458) // Contact sports
+    || (verbly::notion::wnid == 100433802) // Gymnastics
+    || (verbly::notion::wnid == 100439826) // Track and field
+    || (verbly::notion::wnid == 100440747) // Skiing
+    || (verbly::notion::wnid == 100441824) // Water sport
+    || (verbly::notion::wnid == 100445351) // Rowing
+    || (verbly::notion::wnid == 100446980) // Archery
+      // TODO: add more sports
+    || (verbly::notion::wnid == 100021939) // Artifacts
+    || (verbly::notion::wnid == 101471682) // Vertebrates
+      ;
+
+  verbly::filter blacklist =
+    (verbly::notion::wnid == 106883725) // swastika
+    || (verbly::notion::wnid == 104416901) // tetraskele
+    || (verbly::notion::wnid == 102512053) // fish
+    || (verbly::notion::wnid == 103575691) // instrument of execution
+    || (verbly::notion::wnid == 103829563) // noose
+      ;
+
+  verbly::query<verbly::word> pictureQuery = database_->words(
+    (verbly::notion::fullHypernyms %= whitelist)
+    && !(verbly::notion::fullHypernyms %= blacklist)
+    && (verbly::notion::partOfSpeech == verbly::part_of_speech::noun)
+    && (verbly::notion::numOfImages >= 2));
+
+  verbly::word pictured = pictureQuery.first();
+
+  return pictured;
+}
+
+std::pair<Magick::Image, Magick::Image>
+  difference::getImagesForNoun(verbly::word pictured) const
+{
+  int backoff = 0;
+
+  std::cout << "Getting URLs..." << std::endl;
+
+  std::string lstdata;
+  while (lstdata.empty())
+  {
+    std::ostringstream lstbuf;
+    curl::curl_ios<std::ostringstream> lstios(lstbuf);
+    curl::curl_easy lsthandle(lstios);
+    std::string lsturl = pictured.getNotion().getImageNetUrl();
+    lsthandle.add<CURLOPT_URL>(lsturl.c_str());
+
+    try
+    {
+      lsthandle.perform();
+    } catch (const curl::curl_easy_exception& e)
+    {
+      e.print_traceback();
+
+      backoff++;
+      std::cout << "Waiting for " << backoff << " seconds..." << std::endl;
+
+      std::this_thread::sleep_for(std::chrono::seconds(backoff));
+
+      continue;
+    }
+
+    backoff = 0;
+
+    if (lsthandle.get_info<CURLINFO_RESPONSE_CODE>().get() != 200)
     {
-      capnext = true;
+      throw could_not_get_images();
     }
+
+    std::cout << "Got URLs." << std::endl;
+    lstdata = lstbuf.str();
+  }
+
+  std::vector<std::string> lstvec = verbly::split<std::vector<std::string>>(lstdata, "\r\n");
+  if (lstvec.size() < 2)
+  {
+    throw could_not_get_images();
   }
-  
-  return result;
+
+  std::shuffle(std::begin(lstvec), std::end(lstvec), rng_);
+
+  std::deque<std::string> urls;
+  for (std::string& url : lstvec)
+  {
+    urls.push_back(url);
+  }
+
+  Magick::Image image1;
+  bool success = false;
+  while (!urls.empty())
+  {
+    std::string url = urls.front();
+    urls.pop_front();
+
+    try
+    {
+      image1 = getImageAtUrl(url);
+
+      success = true;
+      break;
+    } catch (const could_not_get_images& ex)
+    {
+      // Just try the next one.
+    }
+  }
+
+  if (!success)
+  {
+    throw could_not_get_images();
+  }
+
+  Magick::Image image2;
+  success = false;
+  while (!urls.empty())
+  {
+    std::string url = urls.front();
+    urls.pop_front();
+
+    try
+    {
+      image2 = getImageAtUrl(url);
+
+      success = true;
+      break;
+    } catch (const could_not_get_images& ex)
+    {
+      // Just try the next one.
+    }
+  }
+
+  if (!success)
+  {
+    throw could_not_get_images();
+  }
+
+  return {std::move(image1), std::move(image2)};
 }
 
-bool downloadImage(std::string url, curl::curl_header headers, Magick::Blob& img, Magick::Image& pic)
+Magick::Image difference::getImageAtUrl(std::string url) const
 {
   // willyfogg.com is a thumbnail generator known to return 200 even if the target image no longer exists
   if (url.find("willyfogg.com/thumb.php") != std::string::npos)
   {
-    return false;
+    throw could_not_get_images();
   }
-  
+
+  // Accept string from Google Chrome
+  std::string accept = "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
+  curl::curl_header headers;
+  headers.add(accept);
+
   std::ostringstream imgbuf;
   curl::curl_ios<std::ostringstream> imgios(imgbuf);
   curl::curl_easy imghandle(imgios);
-  
+
   imghandle.add<CURLOPT_HTTPHEADER>(headers.get());
   imghandle.add<CURLOPT_URL>(url.c_str());
   imghandle.add<CURLOPT_CONNECTTIMEOUT>(30);
-  
-  try {
+
+  try
+  {
     imghandle.perform();
   } catch (curl::curl_easy_exception error) {
     error.print_traceback();
-  
-    return false;
+
+    throw could_not_get_images();
   }
 
   if (imghandle.get_info<CURLINFO_RESPONSE_CODE>().get() != 200)
   {
-    return false;
+    throw could_not_get_images();
   }
-  
+
   std::string content_type = imghandle.get_info<CURLINFO_CONTENT_TYPE>().get();
   if (content_type.substr(0, 6) != "image/")
   {
-    return false;
+    throw could_not_get_images();
   }
-  
+
   std::string imgstr = imgbuf.str();
-  img = Magick::Blob(imgstr.c_str(), imgstr.length());
-  pic.read(img);
-  if (pic.rows() == 0)
+  Magick::Blob img(imgstr.c_str(), imgstr.length());
+  Magick::Image pic;
+
+  try
+  {
+    pic.read(img);
+
+    if ((pic.rows() > 0) && (pic.columns() >= 800))
+    {
+      std::cout << url << std::endl;
+    }
+  } catch (const Magick::ErrorOption& e)
   {
-    return false;
+    // Occurs when the the data downloaded from the server is malformed
+    std::cout << "Magick: " << e.what() << std::endl;
+
+    throw could_not_get_images();
   }
-  
-  std::cout << url << std::endl;
-  
-  return true;
+
+  return pic;
 }
 
-int main(int argc, char** argv)
+std::pair<verbly::word, verbly::word> difference::getOppositeIdentifiers() const
 {
-  Magick::InitializeMagick(nullptr);
+  verbly::part_of_speech pos;
 
-  if (argc != 2)
+  if (std::bernoulli_distribution(1.0/2.0)(rng_))
   {
-    std::cout << "usage: difference [configfile]" << std::endl;
-    return -1;
+    pos = verbly::part_of_speech::noun;
+  } else {
+    pos = verbly::part_of_speech::adjective;
   }
 
-  std::string configfile(argv[1]);
-  YAML::Node config = YAML::LoadFile(configfile);
+  verbly::word w1 = database_->words(
+    (verbly::notion::partOfSpeech == pos)
+    && (verbly::word::antonyms)).first();
 
-  int delay = 60 * 60;
-  
-  twitter::auth auth;
-  auth.setConsumerKey(config["consumer_key"].as<std::string>());
-  auth.setConsumerSecret(config["consumer_secret"].as<std::string>());
-  auth.setAccessKey(config["access_key"].as<std::string>());
-  auth.setAccessSecret(config["access_secret"].as<std::string>());
-  
-  twitter::client client(auth);
-  
-  std::random_device random_device;
-  std::mt19937 random_engine{random_device()};
-  
-  std::string fontfile = "@" + config["font"].as<std::string>();
-
-  verbly::data database(config["verbly_datafile"].as<std::string>());
-  
-  auto whitelist = database.nouns();
-  whitelist.with_wnid(111530512); // Crops (plants)
-  whitelist.with_wnid(111536087); // Ornamental (plants)
-  whitelist.with_wnid(111536230); // Pot plants
-  whitelist.with_wnid(113083023); // Houseplants
-  whitelist.with_wnid(113083306); // Garden plants
-  whitelist.with_wnid(113083586); // Vascular plants (includes flowers)
-  whitelist.with_wnid(109287968); // Geological formations
-  whitelist.with_wnid(109208496); // Asterisms (collections of stars)
-  whitelist.with_wnid(109239740); // Celestial bodies
-  whitelist.with_wnid(109277686); // Exterrestrial objects (comets and meteroids)
-  whitelist.with_wnid(109403211); // Radiators (supposedly natural radiators but actually these are just pictures of radiators)
-  whitelist.with_wnid(109416076); // Rocks
-  whitelist.with_wnid(105442131); // Chromosomes
-  whitelist.with_wnid(100324978); // Tightrope walking
-  whitelist.with_wnid(100326094); // Rock climbing
-  whitelist.with_wnid(100433458); // Contact sports
-  whitelist.with_wnid(100433802); // Gymnastics
-  whitelist.with_wnid(100439826); // Track and field
-  whitelist.with_wnid(100440747); // Skiing
-  whitelist.with_wnid(100441824); // Water sport
-  whitelist.with_wnid(100445351); // Rowing
-  whitelist.with_wnid(100446980); // Archery
-  // TODO: add more sports
-  whitelist.with_wnid(100021939); // Artifacts
-  whitelist.with_wnid(101471682); // Vertebrates
-  
-  auto whitedata = whitelist.run();
-  std::set<int> wnids;
-  verbly::filter<verbly::noun> whitefilter;
-  whitefilter.set_orlogic(true);
-  for (auto wd : whitedata)
+  verbly::word w2 = database_->words(
+    (verbly::notion::partOfSpeech == pos)
+    && (verbly::word::antonyms %= w1)).first();
+
+  return {std::move(w1), std::move(w2)};
+}
+
+Magick::Image difference::composeImage(
+  Magick::Image image1,
+  verbly::word word1,
+  Magick::Image image2,
+  verbly::word word2) const
+{
+  if (image1.columns() < 320)
   {
-    if (wnids.count(wd.wnid()) == 0)
-    {
-      whitefilter << wd;
-      wnids.insert(wd.wnid());
-    }
+    image1.zoom(Magick::Geometry(320, image1.rows() * 320 / image1.columns(), 0, 0));
   }
-  
-  // Accept string from Google Chrome
-  std::string accept = "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
-  curl::curl_header headers;
-  headers.add(accept);
-  
-  std::cout << "Started!" << std::endl;
+
+  if (image2.columns() < 320)
+  {
+    image2.zoom(Magick::Geometry(320, image2.rows() * 320 / image2.columns(), 0, 0));
+  }
+
+  int width = std::min(image1.columns(), image2.columns());
+  int height = std::min(image1.rows(), image2.rows());
+  Magick::Geometry geo1(width, height, image1.columns()/2 - width/2, image1.rows()/2 - height/2);
+  Magick::Geometry geo2(width, height, image2.columns()/2 - width/2, image2.rows()/2 - height/2);
+  image1.crop(geo1);
+  image2.crop(geo2);
+
+  Magick::Image composite(Magick::Geometry(width*2, height, 0, 0), "white");
+  composite.draw(Magick::DrawableCompositeImage(0, 0, image1));
+  composite.draw(Magick::DrawableCompositeImage(width, 0, image2));
+  composite.font(fontfile_);
+
+  std::string ant1 = word1.getBaseForm().getText();
+  std::string ant2 = word2.getBaseForm().getText();
+
+  double fontsize = 72;
   for (;;)
   {
-    try
-    {
-      std::cout << "Generating noun..." << std::endl;
-      verbly::noun pictured = database.nouns().full_hyponym_of(whitefilter).at_least_n_images(2).random().limit(1).run().front();
-      std::cout << "Noun: " << pictured.singular_form() << std::endl;
-      std::cout << "Getting URLs..." << std::endl;
-      std::ostringstream lstbuf;
-      curl::curl_ios<std::ostringstream> lstios(lstbuf);
-      curl::curl_easy lsthandle(lstios);
-      std::string lsturl = pictured.imagenet_url();
-      lsthandle.add<CURLOPT_URL>(lsturl.c_str());
-      lsthandle.perform();
-    
-      if (lsthandle.get_info<CURLINFO_RESPONSE_CODE>().get() != 200)
-      {
-        std::cout << "Could not get URLs" << std::endl;
-        continue;
-      }
-    
-      std::cout << "Got URLs." << std::endl;
-      std::string lstdata = lstbuf.str();
-      auto lstlist = verbly::split<std::list<std::string>>(lstdata, "\r\n");
-      std::set<std::string> lstset;
-      for (auto url : lstlist)
-      {
-        lstset.insert(url);
-      }
-    
-      if (lstset.size() < 2)
-      {
-        continue;
-      }
-    
-      std::vector<std::string> lstvec;
-      for (auto url : lstset)
-      {
-        lstvec.push_back(url);
-      }
-    
-      std::shuffle(std::begin(lstvec), std::end(lstvec), random_engine);
-    
-      Magick::Blob img1;
-      Magick::Image pic1;
-      bool success = false;
-      int curind = 0;
-      for (; curind < lstvec.size(); curind++)
-      {
-        if (downloadImage(lstvec[curind], headers, img1, pic1))
-        {
-          success = true;
-          break;
-        }
-      }
-    
-      if (!success)
-      {
-        continue;
-      }
-    
-      success = false;
-      Magick::Blob img2;
-      Magick::Image pic2;
-      for (curind++; curind < lstvec.size(); curind++)
-      {
-        if (downloadImage(lstvec[curind], headers, img2, pic2))
-        {
-          success = true;
-          break;
-        }
-      }
-    
-      if (!success)
-      {
-        continue;
-      }
-    
-      std::string ant1, ant2;
-      std::uniform_int_distribution<int> coinflip(0, 1);
-      if (coinflip(random_engine)==0)
-      {
-        verbly::noun n1 = database.nouns().has_antonyms().random().limit(1).run().front();
-        verbly::noun n2 = n1.antonyms().random().limit(1).run().front();
-        ant1 = n1.singular_form();
-        ant2 = n2.singular_form();
-      } else {
-        verbly::adjective a1 = database.adjectives().has_antonyms().random().limit(1).run().front();
-        verbly::adjective a2 = a1.antonyms().random().limit(1).run().front();
-        ant1 = a1.base_form();
-        ant2 = a2.base_form();
-      }
-    
-      if (pic1.columns() < 320)
-      {
-        pic1.zoom(Magick::Geometry(320, pic1.rows() * 320 / pic1.columns(), 0, 0));
-      }
-    
-      if (pic2.columns() < 320)
-      {
-        pic2.zoom(Magick::Geometry(320, pic2.rows() * 320 / pic2.columns(), 0, 0));
-      }
-    
-      int width = std::min(pic1.columns(), pic2.columns());
-      int height = std::min(pic1.rows(), pic2.rows());
-      Magick::Geometry geo1(width, height, pic1.columns()/2 - width/2, pic1.rows()/2 - height/2);
-      Magick::Geometry geo2(width, height, pic2.columns()/2 - width/2, pic2.rows()/2 - height/2);
-      pic1.crop(geo1);
-      pic2.crop(geo2);
-    
-      Magick::Image composite(Magick::Geometry(width*2, height, 0, 0), "white");
-      composite.draw(Magick::DrawableCompositeImage(0, 0, pic1));
-      composite.draw(Magick::DrawableCompositeImage(width, 0, pic2));
-      composite.font(fontfile);
-    
-      double fontsize = 72;
-      for (;;)
-      {
-        composite.fontPointsize(fontsize);
-      
-        Magick::TypeMetric metric;
-        composite.fontTypeMetrics(ant1, &metric);
-        if (metric.textWidth() > 300)
-        {
-          fontsize -= 0.5;
-          continue;
-        }
-      
-        composite.fontTypeMetrics(ant2, &metric);
-        if (metric.textWidth() > 300)
-        {
-          fontsize -= 0.5;
-          continue;
-        }
-      
-        break;
-      }
-    
-      Magick::TypeMetric metric;
-      composite.fontTypeMetrics(ant1, &metric);
-      std::uniform_int_distribution<int> rowdist(20, (int)(composite.rows() - 19 - metric.textHeight()));
-      int y = rowdist(random_engine);
-      y = composite.rows() - y;
-      int x1 = (width - 40 - metric.textWidth())/2+20;
-      composite.fontTypeMetrics(ant2, &metric);
-      int x2 = (width - 40 - metric.textWidth())/2+20+width;
-      composite.strokeColor("white");
-      composite.strokeWidth(2);
-      composite.antiAlias(false);
-      composite.draw(Magick::DrawableText(x1, y, ant1));
-      composite.draw(Magick::DrawableText(x2, y, ant2));
-    
-      composite.magick("png");
-    
-      Magick::Blob outputimg;
-      composite.write(&outputimg);
-    
-      std::cout << "Generated image!" << std::endl << "Tweeting..." << std::endl;
-    
-      std::stringstream msg;
-      msg << capitalize(ant1);
-      msg << " vs. ";
-      msg << capitalize(ant2);
-
-      long media_id = client.uploadMedia("image/png", (const char*) outputimg.data(), outputimg.length());
-      client.updateStatus(msg.str(), {media_id});
-
-      std::cout << "Done!" << std::endl << "Waiting..." << std::endl << std::endl;
-    } catch (const curl::curl_easy_exception& error)
+    composite.fontPointsize(fontsize);
+
+    Magick::TypeMetric metric;
+    composite.fontTypeMetrics(ant1, &metric);
+    if (metric.textWidth() > 300)
     {
-      error.print_traceback();
-    } catch (const twitter::twitter_error& e)
+      fontsize -= 0.5;
+      continue;
+    }
+
+    composite.fontTypeMetrics(ant2, &metric);
+    if (metric.textWidth() > 300)
     {
-      std::cout << "Twitter error: " << e.what() << std::endl;
+      fontsize -= 0.5;
+      continue;
     }
-    
-    std::this_thread::sleep_for(std::chrono::seconds(delay));
+
+    break;
   }
-  
-  return 0;
+
+  Magick::TypeMetric metric;
+  composite.fontTypeMetrics(ant1, &metric);
+  std::uniform_int_distribution<int> rowdist(20, (int)(composite.rows() - 19 - metric.textHeight()));
+  int y = rowdist(rng_);
+  y = composite.rows() - y;
+  int x1 = (width - 40 - metric.textWidth())/2+20;
+  composite.fontTypeMetrics(ant2, &metric);
+  int x2 = (width - 40 - metric.textWidth())/2+20+width;
+  composite.strokeColor("white");
+  composite.strokeWidth(2);
+  composite.antiAlias(false);
+  composite.draw(Magick::DrawableText(x1, y, ant1));
+  composite.draw(Magick::DrawableText(x2, y, ant2));
+
+  composite.magick("png");
+
+  return composite;
+}
+
+std::string difference::generateTweetText(
+  verbly::word word1,
+  verbly::word word2) const
+{
+  verbly::token result {
+    verbly::token::capitalize(verbly::token::casing::capitalize, word1),
+    "vs.",
+    verbly::token::capitalize(verbly::token::casing::capitalize, word2)
+  };
+
+  return result.compile();
+}
+
+void difference::sendTweet(std::string text, Magick::Image image) const
+{
+  Magick::Blob outputBlob;
+  image.magick("png");
+  image.write(&outputBlob);
+
+  long media_id = client_->uploadMedia("image/png", (const char*) outputBlob.data(), outputBlob.length());
+  client_->updateStatus(std::move(text), {media_id});
 }
@@ -0,0 +1,58 @@
+#ifndef DIFFERENCE_H_081276A3
+#define DIFFERENCE_H_081276A3
+
+#include <random>
+#include <string>
+#include <Magick++.h>
+#include <utility>
+#include <verbly.h>
+#include <stdexcept>
+#include <twitter.h>
+#include <memory>
+
+class difference {
+public:
+
+  difference(
+    std::string configFile,
+    std::mt19937& rng);
+
+  void run() const;
+
+private:
+
+  verbly::word getPicturedNoun() const;
+
+  std::pair<Magick::Image, Magick::Image>
+    getImagesForNoun(verbly::word pictured) const;
+
+  Magick::Image getImageAtUrl(std::string url) const;
+
+  std::pair<verbly::word, verbly::word> getOppositeIdentifiers() const;
+
+  Magick::Image composeImage(
+    Magick::Image image1,
+    verbly::word word1,
+    Magick::Image image2,
+    verbly::word word2) const;
+
+  std::string generateTweetText(verbly::word word1, verbly::word word2) const;
+
+  void sendTweet(std::string text, Magick::Image image) const;
+
+  class could_not_get_images : public std::runtime_error {
+  public:
+
+    could_not_get_images() : std::runtime_error("Could not get images for noun")
+    {
+    }
+  };
+
+  std::mt19937& rng_;
+  std::unique_ptr<verbly::database> database_;
+  std::unique_ptr<twitter::client> client_;
+  std::string fontfile_;
+
+};
+
+#endif /* end of include guard: DIFFERENCE_H_081276A3 */
@@ -0,0 +1,35 @@
+#include "difference.h"
+
+int main(int argc, char** argv)
+{
+  Magick::InitializeMagick(nullptr);
+
+  std::random_device randomDevice;
+  std::mt19937 rng(randomDevice());
+
+  if (argc != 2)
+  {
+    std::cout << "usage: difference [configfile]" << std::endl;
+    return -1;
+  }
+
+  std::string configfile(argv[1]);
+
+  try
+  {
+    difference bot(configfile, rng);
+
+    try
+    {
+      bot.run();
+    } catch (const std::exception& ex)
+    {
+      std::cout << "Error running bot: " << ex.what() << std::endl;
+    }
+  } catch (const std::exception& ex)
+  {
+    std::cout << "Error initializing bot: " << ex.what() << std::endl;
+  }
+
+  return 0;
+}
-Subproject d90a1e74c77ba67f25a812609fd49d479bc464d
+Subproject df906121dd862c0f704e44f28ee079158c431c4
-Subproject 1f898f3bd66c29672275c2c884b17ba662ced62
+Subproject 59eab842de02b2b2ba8bf53e2214b558457e635