fix and re-add facebook share button

templates/bibrec.html

@@ -106,7 +106,10 @@ ${site_top()}
 	  <div id="social" class="noprint">
 	    <ul>
 	      <li>
-		${tw_share    (os.canonical_url, os.twit)}
+		     ${tw_share(os.canonical_url, os.twit)}
+	      </li>
+	      <li>
+		     ${fb_share(os.canonical_url)}
 	      </li>
 	      <li>
 		<a onclick="printpage()" title="Print this page"><span class="icon icon_print" /></a>

templates/social-functions.html

@@ -10,48 +10,40 @@
   <?python
     from six.moves import urllib
 
-    def p (params):
-        return urllib.parse.urlencode (params).replace ('+', '%20')
+    def p(params):
+        return urllib.parse.urlencode(params).replace('+', '%20')
   ?>
 
 
-  <py:def function="fb_share(url, title, description, picture)">
+  <py:def function="fb_share(url)">
     <?python
       params = {
-	  'link': url,
-	  'app_id': cherrypy.config['facebook_app_id'],
-	  'name': title,
-	  'description': description,
-	  'redirect_uri': 'https://www.gutenberg.org/fb_redirect.html',
+	    'u': url,
 	  }
-      if picture is not None:
-          params['picture'] = picture
     ?>
-    <div class="social-button fb-share-button" i18n:comment="Share on Facebook.">
-      <a href="https://www.facebook.com/dialog/feed?${p (params)}"
+    <div class="social-button fb-share-button">
+      <a href="https://www.facebook.com/sharer.php?${p(params)}"
 	 title="Share on Facebook"
-	 onclick="open_share_popup(this.href, this.target, 1024, 560)" target="_fb_share_popup">
+	 onclick="open_share_popup(this.href, this.target, 640, 320)"
+	 target="_top">
 	<span class="icon icon_facebook" />
       </a>
     </div>
   </py:def>
 
-
-
   <py:def function="tw_share(url, text)">
     <!-- tweet without javascript -->
     <?python
       params = {
 	  'url': url,
-	  'text': text.encode ('utf-8'),
+	  'text': text.encode('utf-8'),
 	  'count': 'none',
 	  'lang': os.twitter_lang,
 	  'related': "gutenberg_new:Project Gutenberg New Books"
 	  }
     ?>
     <div class="social-button twitter-share-button">
-      <!--! https://dev.twitter.com/docs/tweet-button -->
-      <a href="https://twitter.com/share?${p (params)}"
+      <a href="https://twitter.com/share?${p(params)}"
 	 title="Share on Twitter"
 	 onclick="open_share_popup(this.href, this.target, 640, 320)"
 	 target="_top">