--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/hide_blockquote/hide_blockquote.js	Thu Jan 04 15:50:29 2018 -0500
@@ -0,0 +1,63 @@
+/**
+ * Hide Blockquotes plugin script
+ *
+ * @licstart  The following is the entire license notice for the
+ * JavaScript code in this file.
+ *
+ * Copyright (c) 2012-2014, The Roundcube Dev Team
+ *
+ * The JavaScript code in this page is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * @licend  The above is the entire license notice
+ * for the JavaScript code in this file.
+ */
+
+if (window.rcmail)
+  rcmail.addEventListener('init', function() { hide_blockquote(); });
+
+function hide_blockquote()
+{
+  var limit = rcmail.env.blockquote_limit;
+
+  if (limit <= 0)
+    return;
+
+  $('div.message-part div.pre > blockquote', $('#messagebody')).each(function() {
+    var div, link, q = $(this),
+      text = $.trim(q.text()),
+      res = text.split(/\n/);
+
+    if (res.length <= limit) {
+      // there can be also a block with very long wrapped line
+      // assume line height = 15px
+      if (q.height() <= limit * 15)
+        return;
+    }
+
+    div = $('<blockquote class="blockquote-header">')
+      .css({'white-space': 'nowrap', overflow: 'hidden', position: 'relative'})
+      .text(res[0]);
+
+    link = $('<span class="blockquote-link"></span>')
+      .css({position: 'absolute', 'z-Index': 2})
+      .text(rcmail.get_label('hide_blockquote.show'))
+      .data('parent', div)
+      .click(function() {
+        var t = $(this), parent = t.data('parent'), visible = parent.is(':visible');
+
+        t.text(rcmail.get_label(visible ? 'hide' : 'show', 'hide_blockquote'))
+          .detach().appendTo(visible ? q : parent);
+
+        parent[visible ? 'hide' : 'show']();
+        q[visible ? 'show' : 'hide']();
+      });
+
+    link.appendTo(div);
+
+    // Modify blockquote
+    q.hide().css({position: 'relative'}).before(div);
+  });
+}