Squashed commit of the following:

commit bd23a7da105d635414643dfcedd9c8f710d565b8
Author: Evan Prodromou <evan@e14n.com>
Date:   Sat Jun 29 07:49:03 2013 -0400

    Make the after flag work correctly

commit 5c5845a2f866f0bbffedd8e2e5d1f512f87d5329
Author: Evan Prodromou <evan@e14n.com>
Date:   Sat Jun 29 06:14:43 2013 -0400

    Add an 'after' flag for backup script

lib/useractivitystream.php

@@ -42,11 +42,12 @@ class UserActivityStream extends AtomUserNoticeFeed
      *                           Raw output mode will attempt to stream, keeping less
      *                           data in memory but will leave $this->activities incomplete.
      */
-    function __construct($user, $indent = true, $outputMode = UserActivityStream::OUTPUT_STRING)
+    function __construct($user, $indent = true, $outputMode = UserActivityStream::OUTPUT_STRING, $after = null)
     {
         parent::__construct($user, null, $indent);
 
         $this->outputMode = $outputMode;
+
         if ($this->outputMode == self::OUTPUT_STRING) {
             // String buffering? Grab all the notices now.
             $notices = $this->getNotices();
@@ -65,6 +66,8 @@ class UserActivityStream extends AtomUserNoticeFeed
             throw new Exception('Invalid outputMode provided to ' . __METHOD__);
         }
 
+        $this->after = $after;
+
         // Assume that everything but notices is feasible
         // to pull at once and work with in memory...
 
@@ -123,7 +126,7 @@ class UserActivityStream extends AtomUserNoticeFeed
                     $notices = $this->getNoticesBetween($start, $end);
                     foreach ($notices as $noticeAct) {
                         try {
-                            $nact = $noticeAct->asActivity();
+                            $nact = $noticeAct->asActivity($this->user);
                             if ($format == Feed::ATOM) {
                                 $nact->outputTo($this, false, false);
                             } else {
@@ -172,10 +175,14 @@ class UserActivityStream extends AtomUserNoticeFeed
         if ($this->outputMode == self::OUTPUT_RAW) {
             // Grab anything after the last pre-sorted activity.
             try {
+                if (!empty($this->after)) {
+                    $notices = $this->getNoticesBetween($this->after, $end);
+                } else {
                     $notices = $this->getNoticesBetween(0, $end);
+                }
                 foreach ($notices as $noticeAct) {
                     try {
-                        $nact = $noticeAct->asActivity();
+                        $nact = $noticeAct->asActivity($this->user);
                         if ($format == Feed::ATOM) {
                             $nact->outputTo($this, false, false);
                         } else {
@@ -195,6 +202,7 @@ class UserActivityStream extends AtomUserNoticeFeed
             }
         }
 
+        if (empty($this->after) || strtotime($this->user->created) > $this->after) {
             // We always add the registration activity at the end, even if
             // they have older activities (from restored backups) in their stream.
 
@@ -214,6 +222,7 @@ class UserActivityStream extends AtomUserNoticeFeed
                 continue;
             }
         }
+    }
 
     function compareObject($a, $b)
     {
@@ -231,6 +240,10 @@ class UserActivityStream extends AtomUserNoticeFeed
 
         $sub->subscriber = $this->user->id;
 
+        if (!empty($this->after)) {
+            $sub->whereAdd("created > '" . common_sql_date($this->after) . "'");
+        }
+
         if ($sub->find()) {
             while ($sub->fetch()) {
                 if ($sub->subscribed != $this->user->id) {
@@ -250,6 +263,10 @@ class UserActivityStream extends AtomUserNoticeFeed
 
         $sub->subscribed = $this->user->id;
 
+        if (!empty($this->after)) {
+            $sub->whereAdd("created > '" . common_sql_date($this->after) . "'");
+        }
+
         if ($sub->find()) {
             while ($sub->fetch()) {
                 if ($sub->subscriber != $this->user->id) {
@@ -269,6 +286,10 @@ class UserActivityStream extends AtomUserNoticeFeed
 
         $fave->user_id = $this->user->id;
 
+        if (!empty($this->after)) {
+            $fave->whereAdd("modified > '" . common_sql_date($this->after) . "'");
+        }
+
         if ($fave->find()) {
             while ($fave->fetch()) {
                 $faves[] = clone($fave);
@@ -292,6 +313,17 @@ class UserActivityStream extends AtomUserNoticeFeed
 
         $notice->profile_id = $this->user->id;
 
+        // Only stuff after $this->after
+
+        if (!empty($this->after)) {
+            if ($start) {
+                $start = max($start, $this->after);
+            }
+            if ($end) {
+                $end = max($end, $this->after);
+            }
+        }
+
         if ($start) {
             $tsstart = common_sql_date($start);
             $notice->whereAdd("created >= '$tsstart'");
@@ -314,8 +346,12 @@ class UserActivityStream extends AtomUserNoticeFeed
 
     function getNotices()
     {
+        if (!empty($this->after)) {
+            return $this->getNoticesBetween($this->after);
+        } else {
             return $this->getNoticesBetween();
         }
+    }
 
     function getGroups()
     {
@@ -325,6 +361,10 @@ class UserActivityStream extends AtomUserNoticeFeed
 
         $gm->profile_id = $this->user->id;
 
+        if (!empty($this->after)) {
+            $gm->whereAdd("created > '" . common_sql_date($this->after) . "'");
+        }
+
         if ($gm->find()) {
             while ($gm->fetch()) {
                 $groups[] = clone($gm);
@@ -338,14 +378,31 @@ class UserActivityStream extends AtomUserNoticeFeed
     {
         $msgMap = Memcached_DataObject::listGet('Message', 'to_profile', array($this->user->id));
 
-        return $msgMap[$this->user->id];
+        $messages = $msgMap[$this->user->id];
+
+        if (!empty($this->after)) {
+            $messages = array_filter($messages, array($this, 'createdAfter'));
+        }
+
+        return $messages;
     }
 
     function getMessagesFrom()
     {
         $msgMap = Memcached_DataObject::listGet('Message', 'from_profile', array($this->user->id));
 
-        return $msgMap[$this->user->id];
+        $messages = $msgMap[$this->user->id];
+
+        if (!empty($this->after)) {
+            $messages = array_filter($messages, array($this, 'createdAfter'));
+        }
+
+        return $messages;
+    }
+
+    function createdAfter($item) {
+        $created = strtotime((empty($item->created)) ? $item->modified : $item->created);
+        return ($created >= $this->after);
     }
 
     function writeJSON($handle)

scripts/backupuser.php

@@ -19,8 +19,8 @@
 
 define('INSTALLDIR', realpath(dirname(__FILE__) . '/..'));
 
-$shortoptions = 'i:n:f:j';
+$shortoptions = 'i:n:f:a:j';
-$longoptions = array('id=', 'nickname=', 'file=', 'json');
+$longoptions = array('id=', 'nickname=', 'file=', 'after=', 'json');
 
 $helptext = <<<END_OF_EXPORTACTIVITYSTREAM_HELP
 exportactivitystream.php [options]
@@ -29,6 +29,7 @@ Export a StatusNet user history to a file
   -i --id       ID of user to export
   -n --nickname nickname of the user to export
   -j --json     Output JSON (default Atom)
+  -a --after    Only activities after the given date
 
 END_OF_EXPORTACTIVITYSTREAM_HELP;
 
@@ -36,7 +37,13 @@ require_once INSTALLDIR.'/scripts/commandline.inc';
 
 try {
     $user = getUser();
+    if (have_option('a', 'after')) {
+        $afterStr = get_option_value('a', 'after');
+        $after = strtotime($afterStr);
+        $actstr = new UserActivityStream($user, true, UserActivityStream::OUTPUT_RAW, $after);
+    } else {
         $actstr = new UserActivityStream($user, true, UserActivityStream::OUTPUT_RAW);
+    }
     if (have_option('j', 'json')) {
         $actstr->writeJSON(STDOUT);
     } else {