# HG changeset patch
# User Jacob Dawid <jacob.dawid@gmail.com>
# Date 1343669234 -7200
# Node ID 48ae6a7c69c12ee316fb2fe69f8e702fa1a27c0b
# Parent  6889217b9d786c5347ad55e9a76bbb6b629fd950
Integrated texinfo browser from QtOctave.

* documentation-dockwidget.cc: Added new dock widget for the documentation.
* documentation-dockwidget.h: Added new dock widget for the documentation.
* bookmark.png: New icon file.
* question.png: New icon file.
* star.png: New icon file.
* stop.png: New icon file.
* zoom-in.png: New icon file.
* zoom-out.png: New icon file.
* parser.cc: Added file from QtOctave, refactored code.
* parser.h: Added file from QtOctave, refactored code.
* webinfo.cc: Added file from QtOctave, refactored code.
* webinfo.h: Added file from QtOctave, refactored code.
* main-window.cc: Added menu entries to handle documentation and integrated new documentation dock widget.
* main-window.h: Including header for documentation dock widget and added member variable.
* resource.qrc: Added icon entries for new icon files.
* src.pro: Added file entries for new file added to the project.

diff --git a/gui/src/documentation-dockwidget.cc b/gui/src/documentation-dockwidget.cc
new file mode 100644
--- /dev/null
+++ b/gui/src/documentation-dockwidget.cc
@@ -0,0 +1,45 @@
+/* OctaveGUI - A graphical user interface for Octave
+ * Copyright (C) 2011 Jacob Dawid (jacob.dawid@googlemail.com)
+ *
+ * This program 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "documentation-dockwidget.h"
+
+documentation_dock_widget::documentation_dock_widget (QWidget *parent)
+  : QDockWidget (parent)
+{
+  setObjectName ("DocumentationDockWidget");
+  setWindowTitle (tr ("Documentation"));
+
+  connect (this, SIGNAL (visibilityChanged (bool)),
+           this, SLOT (handle_visibility_changed (bool)));
+
+  _webinfo = new webinfo (this);
+  setWidget (_webinfo);
+}
+
+void
+documentation_dock_widget::handle_visibility_changed (bool visible)
+{
+  if (visible)
+    emit active_changed (true);
+}
+
+void
+documentation_dock_widget::closeEvent (QCloseEvent *event)
+{
+  emit active_changed (false);
+  QDockWidget::closeEvent (event);
+}
diff --git a/gui/src/documentation-dockwidget.h b/gui/src/documentation-dockwidget.h
new file mode 100644
--- /dev/null
+++ b/gui/src/documentation-dockwidget.h
@@ -0,0 +1,45 @@
+/* OctaveGUI - A graphical user interface for Octave
+ * Copyright (C) 2011 Jacob Dawid (jacob.dawid@googlemail.com)
+ *
+ * This program 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DOCUMENTATIONDOCKWIDGET_H
+#define DOCUMENTATIONDOCKWIDGET_H
+
+#include <QDockWidget>
+#include "webinfo.h"
+
+class documentation_dock_widget : public QDockWidget
+{
+  Q_OBJECT
+public:
+  documentation_dock_widget (QWidget *parent = 0);
+
+public slots:
+  /** Slot to steer changing visibility from outside. */
+  void handle_visibility_changed (bool visible);
+
+signals:
+  /** Custom signal that tells if a user has clicked away that dock widget. */
+  void active_changed (bool active);
+
+protected:
+  void closeEvent (QCloseEvent *event);
+
+private:
+  webinfo *_webinfo;
+};
+
+#endif // DOCUMENTATIONDOCKWIDGET_H
diff --git a/gui/src/icons/bookmark.png b/gui/src/icons/bookmark.png
new file mode 100644
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diff --git a/gui/src/icons/question.png b/gui/src/icons/question.png
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diff --git a/gui/src/icons/star.png b/gui/src/icons/star.png
new file mode 100644
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diff --git a/gui/src/icons/zoom-out.png b/gui/src/icons/zoom-out.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..b56a0bb79fc0403afca890a53945c9feba7a2092
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diff --git a/gui/src/main-window.cc b/gui/src/main-window.cc
--- a/gui/src/main-window.cc
+++ b/gui/src/main-window.cc
@@ -310,6 +310,19 @@
 }
 
 void
+main_window::focus_documentation ()
+{
+  if (!_documentation_dock_widget->isVisible ())
+    {
+      _documentation_dock_widget->setVisible (true);
+    }
+
+  _documentation_dock_widget->setFocus ();
+  _documentation_dock_widget->activateWindow ();
+  _documentation_dock_widget->raise ();
+}
+
+void
 main_window::handle_entered_debug_mode ()
 {
   setWindowTitle ("Octave (Debugging)");
@@ -429,6 +442,8 @@
   _history_dock_widget->setStatusTip (tr ("Browse and search the command history."));
   _files_dock_widget        = new files_dock_widget (this);
   _files_dock_widget->setStatusTip (tr ("Browse your files."));
+  _documentation_dock_widget= new documentation_dock_widget (this);
+  _documentation_dock_widget->setStatusTip (tr ("See the documentation for help."));
   _status_bar               = new QStatusBar (this);
 
   _current_directory_combo_box = new QComboBox (this);
@@ -639,6 +654,11 @@
   show_editor_action->setCheckable (true);
   show_editor_action->setShortcut (Qt::ControlModifier + Qt::ShiftModifier
                                    + Qt::Key_4);
+
+  QAction * show_documentation_action = window_menu->addAction (tr ("Show Documentation"));
+  show_documentation_action->setCheckable (true);
+  show_documentation_action->setShortcut (Qt::ControlModifier + Qt::ShiftModifier
+                                   + Qt::Key_5);
   window_menu->addSeparator ();
 
   QAction * command_window_action
@@ -661,6 +681,10 @@
     = window_menu->addAction (tr ("Editor"));
   editor_action->setShortcut (Qt::ControlModifier + Qt::Key_4);
 
+  QAction * documentation_action
+    = window_menu->addAction (tr ("Documentation"));
+  documentation_action->setShortcut (Qt::ControlModifier + Qt::Key_5);
+
   window_menu->addSeparator ();
   QAction * reset_windows_action
     = window_menu->addAction (tr ("Reset Windows"));
@@ -733,6 +757,10 @@
            _file_editor,                SLOT   (setVisible (bool)));
   connect (_file_editor,                SIGNAL (active_changed (bool)),
            show_editor_action,          SLOT   (setChecked (bool)));
+  connect (show_documentation_action,   SIGNAL (toggled (bool)),
+           _documentation_dock_widget,  SLOT   (setVisible (bool)));
+  connect (_documentation_dock_widget,  SIGNAL (active_changed (bool)),
+           show_documentation_action,   SLOT   (setChecked (bool)));
 
   connect (command_window_action,       SIGNAL (triggered ()),
            this,                        SLOT (focus_command_window ()));
@@ -744,6 +772,8 @@
            this,                        SLOT (focus_current_directory ()));
   connect (editor_action,               SIGNAL (triggered ()),
            this,                        SLOT (focus_editor ()));
+  connect (documentation_action,        SIGNAL (triggered ()),
+           this,                        SLOT (focus_documentation ()));
 
   connect (reset_windows_action,        SIGNAL (triggered ()),
            this,                        SLOT   (reset_windows ()));
@@ -796,6 +826,7 @@
   addDockWidget (Qt::RightDockWidgetArea, _files_dock_widget);
   addDockWidget (Qt::RightDockWidgetArea, _file_editor);
   addDockWidget (Qt::BottomDockWidgetArea, _terminal_dock_widget);
+  addDockWidget (Qt::RightDockWidgetArea, _documentation_dock_widget);
   setStatusBar (_status_bar);
   read_settings ();
 
diff --git a/gui/src/main-window.h b/gui/src/main-window.h
--- a/gui/src/main-window.h
+++ b/gui/src/main-window.h
@@ -44,6 +44,7 @@
 #include "history-dockwidget.h"
 #include "files-dockwidget.h"
 #include "terminal-dockwidget.h"
+#include "documentation-dockwidget.h"
 #include "octave-qt-event-listener.h"
 #include "octave-event-observer.h"
 
@@ -104,6 +105,7 @@
   void focus_current_directory ();
   void focus_workspace ();
   void focus_editor ();
+  void focus_documentation ();
 
   void handle_entered_debug_mode ();
   void handle_quit_debug_mode ();
@@ -137,6 +139,7 @@
   history_dock_widget *     _history_dock_widget;
   files_dock_widget *       _files_dock_widget;
   terminal_dock_widget *    _terminal_dock_widget;
+  documentation_dock_widget*_documentation_dock_widget;
 
   // Toolbars.
   QStatusBar *              _status_bar;
diff --git a/gui/src/qtinfo/parser.cc b/gui/src/qtinfo/parser.cc
new file mode 100644
--- /dev/null
+++ b/gui/src/qtinfo/parser.cc
@@ -0,0 +1,578 @@
+/* Copyright (C) 2009 P.L. Lucas
+ * Copyright (C) 2012 Jacob Dawid <jacob.dawid@gmail.com>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "parser.h"
+#include <QFileInfo>
+#include <QDir>
+#include <QFile>
+#include <QUrl>
+#include <QRegExp>
+#include <QProcess>
+#include <QBuffer>
+
+parser::parser(QObject *parent)
+  : QObject(parent)
+{
+  _compressors_map.insert ("bz2",  "bzip2 -dc \"%1\"");
+  _compressors_map.insert ("gz",   "gzip -dc \"%1\"");
+  _compressors_map.insert ("lzma", "lzma -dc \"%1\"");
+  _compressors_map.insert ("xz",   "xz -dc \"%1\"");
+  _compressors_map.insert ("Z",    "gunzip -c \"%1\"");
+}
+
+void
+parser::set_info_path (QString infoPath)
+{
+  this->_info_path = infoPath;
+
+  _info_files.clear ();
+
+  QFileInfo info (infoPath);
+
+  QString path = info.absolutePath ();
+  QString fileName = info.fileName ();
+
+  QDir infoDir (path);
+  QStringList filter;
+  filter.append (fileName + "*");
+
+  _info_files = infoDir.entryInfoList (filter, QDir::Files);
+  parse_info_map ();
+}
+
+QString
+parser::get_info_path ()
+{
+  return _info_path;
+}
+
+QIODevice *
+parser::open_file (QFileInfo & file_info)
+{
+  QIODevice *iodevice=NULL;
+  if ( _compressors_map.contains(file_info.suffix ()))
+    {
+      QProcess gzip;
+      gzip.start (_compressors_map.value (file_info.suffix ()).arg (file_info.absoluteFilePath ()));
+
+      if (!gzip.waitForFinished ())
+        return NULL;
+
+      QByteArray result = gzip.readAll ();
+
+      QBuffer *io = new QBuffer (this);
+      io->setData (result);
+
+      if (!io->open (QIODevice::ReadOnly | QIODevice::Text))
+        return NULL;
+
+      iodevice = io;
+    }
+  else
+    {
+      QFile *io = new QFile (file_info.absoluteFilePath ());
+      if (!io->open (QIODevice::ReadOnly | QIODevice::Text))
+        return NULL;
+      iodevice = io;
+    }
+
+  return iodevice;
+}
+
+int
+parser::is_ref (QString node)
+{
+  if (_ref_map.contains (node))
+    {
+      node_position ref = _ref_map [node];
+
+      return ref.pos-_node_map [ref._node_name].pos;
+    }
+  return -1;
+}
+
+QString
+parser::search_node (QString node)
+{
+  QFileInfo file_info;
+  QString ref;
+
+  if (_ref_map.contains (node))
+    {
+      ref = node;
+      node = _ref_map [ref]._node_name;
+    }
+
+  if (_node_map.contains (node))
+    {
+      int pos = _node_map [node].pos;
+      int realPos;
+
+      real_position (pos, file_info, realPos);
+
+      QIODevice *io = open_file (file_info);
+      if (io == NULL)
+        {
+          return QString ();
+        }
+
+      seek (io, realPos);
+
+      QString text = get_next_node (io);
+      if (!text.isEmpty())
+        {
+          return text;
+        }
+
+      io->close ();
+      delete io;
+    }
+
+  return QString ();
+}
+
+QString
+parser::search_node (QString node, QIODevice *io)
+{
+  while (!io->atEnd ())
+    {
+      QString text = get_next_node (io);
+      if(node == get_node_name (text))
+        {
+          return text;
+        }
+    }
+
+  return QString ();
+}
+
+QString
+parser::get_next_node (QIODevice *io)
+{
+  QString text;
+  while (!io->atEnd ())
+    {
+      QByteArray line = io->readLine ();
+      if (line.at(0) == 31)
+        {
+          break;
+        }
+      else
+        {
+          text.append (line);
+        }
+    }
+  return text;
+}
+
+static QString
+get_first_line (QString text)
+{
+  int n = text.indexOf ("\n");
+
+  if (n < 0)
+    {
+      return QString ();
+    }
+
+  QString first_line = text.left (n);
+  return first_line;
+}
+
+static QString
+parser_node (QString text, QString node_name)
+{
+  QString firstLine = get_first_line (text);
+  QStringList nodes = firstLine.split (",");
+  for (int i = 0;i < nodes.size (); i++)
+    {
+      QString node = nodes.at (i).trimmed ();
+
+      if (node.startsWith (node_name))
+        {
+          return node.remove (0, node_name.size ()).trimmed ();
+        }
+    }
+  return QString ();
+}
+
+QString
+parser::get_node_name (QString text)
+{
+  return parser_node (text, "Node:");
+}
+
+QString
+parser::get_node_up (QString text)
+{
+  return parser_node (text, "Up:");
+}
+
+QString
+parser::get_node_next (QString text)
+{
+  return parser_node (text, "Next:");
+}
+
+QString
+parser::get_node_prev (QString text)
+{
+  return parser_node (text, "Prev:");
+}
+
+static void
+replace_links (QString &text)
+{
+  QRegExp re ("(\\*[N|n]ote|\n\\*)([ |\n]+)([^:]+):([^:\\.,]*)([:,\\.])");
+  int i = 0, f;
+
+  while ( (i = re.indexIn (text,i)) != -1)
+    {
+      QString type     = re.cap (1);
+      QString note     = re.cap (3);
+      QString url_link = re.cap (4);
+      QString link     = re.cap (4);
+
+      if (url_link.isEmpty ())
+        {
+          url_link = note;
+        }
+
+      url_link = url_link.trimmed ();
+      url_link.replace ("\n"," ");
+      url_link.replace (QRegExp ("  +")," ");
+      url_link.replace ("<b>","");
+      url_link.replace ("</b>","");
+      url_link = QUrl::toPercentEncoding (url_link, "", "'");
+
+      QString href;
+      if (type=="\n*")
+        {
+          href="\n<img src=':/actions/icons/bookmark.png'/>";
+        }
+      else
+        {
+          href="<img src=':/actions/icons/bookmark.png'/>";
+        }
+      href += re.cap (2) + "<a href='" + url_link + "'>" + note + ":" + link + re.cap (5) + "</a>";
+      f = re.matchedLength ();
+      text.replace (i,f,href);
+      i += href.size ();
+    }
+}
+
+static void
+replace_colons (QString &text)
+{
+  QRegExp re ("`([^']+)'");
+  int i = 0, f;
+  while ( (i = re.indexIn (text, i)) != -1)
+    {
+      QString t = re.cap (1);
+      QString bold = "<b>`" + t + "</b>'";
+
+      f = re.matchedLength ();
+      text.replace (i,f,bold);
+      i += bold.size ();
+    }
+}
+
+static void
+info_to_html (QString &text)
+{
+  text.replace ("&", "&amp;");
+  text.replace ("<", "&lt;");
+  text.replace (">", "&gt;");
+
+  text.replace ("\n* Menu:", "\n<b>Menu:</b>");
+  text.replace ("*See also:*", "<b>See also:</b>");
+  replace_colons (text);
+  replace_links (text);
+}
+
+QString
+parser::node_text_to_html (QString text, int anchorPos, QString anchor)
+{
+  QString nodeName = get_node_name (text);
+  QString nodeUp   = get_node_up (text);
+  QString nodeNext = get_node_next (text);
+  QString nodePrev = get_node_prev (text);
+
+  if (anchorPos > -1)
+    {
+      QString text1 = text.left (anchorPos);
+      QString text2 = text.mid (anchorPos);
+
+      int n = text1.indexOf ("\n");
+      text1.remove (0, n);
+
+      info_to_html (text1);
+      info_to_html (text2);
+
+      text = text1 + "<a name='" + anchor + "' /><img src=':/actions/icons/stop.png'>" + text2;
+    }
+  else
+    {
+      int n = text.indexOf ("\n");
+      text.remove (0, n);
+      info_to_html (text);
+    }
+
+  QString navigationLinks = QString (
+        "<img src=':/actions/icons/arrow_right.png'/> <b>Section:</b> %1<br>"
+        "<b>Previous Section:</b> <a href='%2'>%3</a><br>"
+        "<b>Next Section:</b> <a href='%4'>%5</a><br>"
+        "<b>Up:</b> <a href='%6'>%7</a><br>\n"
+        )
+      .arg (nodeName)
+      .arg (QString (QUrl::toPercentEncoding (nodePrev, "", "'")))
+      .arg (nodePrev)
+      .arg (QString (QUrl::toPercentEncoding (nodeNext, "", "'")))
+      .arg (nodeNext)
+      .arg (QString (QUrl::toPercentEncoding (nodeUp, "", "'")))
+      .arg (nodeUp);
+
+
+  text.prepend ("<hr>\n<pre>");
+  text.append ("</pre>\n<hr><hr>\n");
+  text.prepend (navigationLinks);
+  text.append (navigationLinks);
+  text.prepend ("<html><body>\n");
+  text.append ("</body></html>\n");
+  return text;
+}
+
+void
+parser::parse_info_map ()
+{
+  QRegExp re ("(Node|Ref): ([^\\0177]+)\\0177(\\d+)\n");
+  QRegExp re_files ("([^:]+): (\\d+)\n");
+  int foundCount = 0;
+
+  for(int i = 0; i < _info_files.size (); i++)
+    {
+      QFileInfo fileInfo = _info_files.at (i);
+
+      QIODevice *io = open_file (fileInfo);
+      if (io == NULL)
+        {
+          continue;
+        }
+
+      QString nodeText;
+      while (! (nodeText=get_next_node (io)).isEmpty () && foundCount < 2)
+        {
+          QString first_line = get_first_line (nodeText);
+          if (first_line.startsWith ("Tag") )
+            {
+              foundCount++;
+              int pos = 0;
+              QString last_node;
+
+              while ((pos = re.indexIn (nodeText, pos)) != -1) {
+                  QString type = re.cap (1);
+                  QString node = re.cap (2);
+                  int index = re.cap (3).toInt ();
+
+                  if (type == "Node")
+                    {
+                      node_map_item item;
+                      item.pos = index;
+                      _node_map [node] = item;
+                      last_node = node;
+                    }
+                  else if (type == "Ref")
+                    {
+                      node_position item;
+                      item._node_name = last_node;
+                      item.pos = index;
+                      _ref_map [node] = item;
+                    }
+                  pos += re.matchedLength ();
+                }
+              break;
+            }
+          else if (first_line.startsWith ("Indirect:"))
+            {
+              foundCount++;
+              int pos = 0;
+
+              while ( (pos = re_files.indexIn (nodeText, pos)) != -1) {
+                  QString fileCap = re_files.cap (1).trimmed ();
+                  int index = re_files.cap (2).toInt ();
+
+                  info_file_item item;
+                  for (int j = 0;j < _info_files.size (); j++)
+                    {
+                      QFileInfo info = _info_files.at (j);
+                      if (info.fileName ().startsWith (fileCap))
+                        {
+                          item.file_info = info;
+                          break;
+                        }
+                    }
+                  item.real_size = index;
+                  _info_file_real_size_list.append (item);
+                  pos += re_files.matchedLength ();
+                }
+
+            }
+        }
+      io->close ();
+      delete io;
+    }
+}
+
+void
+parser::real_position (int pos, QFileInfo & file_info, int & real_pos)
+{
+  int header = -1, sum = 0;
+  for (int i = 0; i < _info_file_real_size_list.size (); i++)
+    {
+      info_file_item item = _info_file_real_size_list.at (i);
+      if (header == -1)
+        {
+          file_info = item.file_info;
+          header = item.real_size;
+        }
+
+      if (pos < item.real_size)
+        {
+          break;
+        }
+
+      file_info = item.file_info;
+      sum = item.real_size;
+    }
+  real_pos = pos - sum + header + 2;
+}
+
+void
+parser::seek (QIODevice *io, int pos)
+{
+  char ch;
+  while (!io->atEnd () && pos > 0)
+    {
+      io->getChar (&ch);
+      pos--;
+    }
+}
+
+static void
+replace (QString &text, QRegExp re, QString after)
+{
+  int pos = 0;
+
+  while ( (pos = re.indexIn (text, pos)) != -1)
+    {
+      QString cap = text.mid (pos,re.matchedLength ());
+      QString a (after);
+      a = a.arg (cap);
+      text.remove (pos, re.matchedLength ());
+      text.insert (pos, a);
+      pos += a.size ();
+    }
+}
+
+QString
+parser::global_search (QString text, int max_founds)
+{
+  QString results;
+  QStringList words = text.split (" ",QString::SkipEmptyParts);
+
+  QString re_program ("(" + words.at (0));
+  for (int i = 1; i < words.size (); i++)
+    {
+      re_program += "|" + words.at (i);
+    }
+  re_program += ")";
+
+  QRegExp re (re_program, Qt::CaseInsensitive);
+
+  results.append ("<html><body>\n<h1>Search results</h1>\n<b>Results for:</b> ");
+  results.append (text);
+  results.append ("<br>\n");
+
+  for (int i = 0; i < _info_files.size (); i++)
+    {
+      QFileInfo file_info = _info_files.at (i);
+      QIODevice *io = open_file (file_info);
+      if (io == NULL)
+        {
+          continue;
+        }
+
+      QString node_text;
+      while ( !(node_text = get_next_node (io)).isEmpty ())
+        {
+          QString firstLine = get_first_line (node_text);
+          QString node = get_node_name (node_text);
+          if (node.isEmpty ())
+            {
+              continue;
+            }
+
+          int n = node_text.indexOf ("\n");
+          node_text.remove (0, n);
+
+          int pos = 0;
+          int founds = 0;
+
+          for (; founds < words.size () && node_text.indexOf (words.at (founds)) >= 0; founds++)
+            { }
+
+          if (founds<words.size ())
+            {
+              continue;
+            }
+          founds = 0;
+
+          while ( (pos = re.indexIn (node_text, pos)) != -1 && founds < max_founds)
+            {
+              int line_start, line_end;
+              line_start = node_text.lastIndexOf ("\n", pos);
+              line_end = node_text.indexOf ("\n", pos);
+              QString line = node_text.mid (line_start, line_end - line_start).trimmed ();
+
+              if (founds == 0)
+                {
+                  results.append(
+                        "<br>\n<img src=':/actions/icons/bookmark.png'> <a href='"
+                        + QString(QUrl::toPercentEncoding(node,"","'")) +
+                        "'>");
+                  results.append (node);
+                  results.append ("</a><br>\n");
+                }
+
+              replace (line, re, "<i>%1</i>");
+              results.append (line);
+              results.append ("<br>\n");
+
+              founds++;
+
+              pos += re.matchedLength ();
+            }
+        }
+      io->close ();
+      delete io;
+    }
+
+  results.append ("</body></html>");
+  return results;
+}
diff --git a/gui/src/qtinfo/parser.h b/gui/src/qtinfo/parser.h
new file mode 100644
--- /dev/null
+++ b/gui/src/qtinfo/parser.h
@@ -0,0 +1,111 @@
+/* Copyright (C) 2009 P.L. Lucas
+ * Copyright (C) 2012 Jacob Dawid <jacob.dawid@gmail.com>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <QStringList>
+#include <QIODevice>
+#include <QFileInfoList>
+#include <QHash>
+
+/**
+ * \class parser
+ * This class gets nodes and searchs inside of `info files'.
+ * <p>Each info file has nodes. Every node has the documentation.
+ * Info files contains a map with position of each node.</p>
+ * <p>What is position?
+ * There is a simple answer:
+ * If you make a queue with info files, position will be the number of bytes
+ * from begining to node position.</p>
+ * <p>
+ * But is not so easy. There is headers, and qtinfo must not take these headers into account.
+ * </p>
+ * <p>
+ * This class also translates info files to html.
+ * </p>
+ */
+class parser
+    : public QObject
+{
+  Q_OBJECT
+
+public:
+  parser (QObject *parent = 0);
+  void set_info_path (QString _info_path);
+  QString get_info_path ();
+  QString search_node (QString node);
+  QString global_search (QString text, int maxFounds);
+
+  /** Checks if this node is reference. If node is reference, it will be returned its position
+    * in text, else  it will be returned -1.
+    */
+  int is_ref (QString node);
+
+  /**Translates text of node to Html. If anchorPos is not -1, then anchor is inserted in that
+    * position.
+    */
+  QString node_text_to_html (QString text, int anchorPos=-1, QString anchor=QString());
+
+private:
+  struct node_position
+  {
+    QString _node_name;
+    int pos;
+  };
+
+  struct node_map_item
+  {
+    int pos;
+  };
+
+  struct info_file_item
+  {
+    QFileInfo file_info;
+    int real_size;
+  };
+
+  QString search_node (QString node, QIODevice * io);
+  QString get_next_node (QIODevice * io);
+  QString get_node_name (QString text);
+  QString get_node_up (QString text);
+  QString get_node_next (QString text);
+  QString get_node_prev (QString text);
+
+  /** Parses info files and gets map of node positions.*/
+  void parse_info_map();
+
+  /** Open info files and uncompress them. */
+  QIODevice *open_file(QFileInfo & fileInfo);
+
+  /** Calculates real position of nodes.
+    * \param pos position from info file.
+    * \param fileInfo returns file what contains that position.
+    * \param realPos returns real position inside of fileInfo.
+    */
+  void real_position (int pos, QFileInfo & file_info, int & real_pos);
+
+  /** Seeks to position pos. */
+  void seek (QIODevice *io, int pos);
+
+
+  QString                       _info_path;
+  QFileInfoList                 _info_files;
+  QHash<QString, node_map_item> _node_map;
+  QHash<QString, node_position> _ref_map;
+  QList<info_file_item>         _info_file_real_size_list;
+  QHash<QString, QString>       _compressors_map;
+};
diff --git a/gui/src/qtinfo/webinfo.cc b/gui/src/qtinfo/webinfo.cc
new file mode 100644
--- /dev/null
+++ b/gui/src/qtinfo/webinfo.cc
@@ -0,0 +1,209 @@
+/* Copyright (C) 2009 P.L. Lucas
+ * Copyright (C) 2012 Jacob Dawid <jacob.dawid@gmail.com>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "webinfo.h"
+#include <QVBoxLayout>
+#include <QHBoxLayout>
+
+
+webinfo::webinfo (QWidget *parent)
+  :QWidget (parent)
+{
+  _font_web = font ();
+
+  QVBoxLayout *layout = new QVBoxLayout ();
+  setLayout (layout);
+
+  QHBoxLayout *hboxLayout = new QHBoxLayout ();
+  layout->addLayout (hboxLayout);
+
+  _close_tab_button = new QPushButton (this);
+  _close_tab_button->setSizePolicy (QSizePolicy::Fixed,QSizePolicy::Preferred);
+  _close_tab_button->setIcon (QIcon (":/actions/icons/stop.png"));
+  hboxLayout->addWidget (_close_tab_button);
+
+  _tab_bar = new QTabBar (this);
+  _tab_bar->setSizePolicy (QSizePolicy::Preferred,QSizePolicy::Preferred);
+  _tab_bar->setExpanding (false);
+  hboxLayout->addWidget (_tab_bar);
+
+  _zoom_in_button = new QToolButton (this);
+  _zoom_in_button->setSizePolicy (QSizePolicy::Fixed,QSizePolicy::Preferred);
+  _zoom_in_button->setIcon (QIcon (":/actions/icons/zoom-in.png"));
+  hboxLayout->addWidget (_zoom_in_button);
+
+  _zoom_out_button = new QToolButton (this);
+  _zoom_out_button->setSizePolicy (QSizePolicy::Fixed,QSizePolicy::Preferred);
+  _zoom_out_button->setIcon (QIcon (":/actions/icons/zoom-out.png"));
+  hboxLayout->addWidget (_zoom_out_button);
+
+  _stacked_widget = new QStackedWidget (this);
+  layout->addWidget (_stacked_widget);
+
+  hboxLayout = new QHBoxLayout ();
+  layout->addLayout (hboxLayout);
+
+  _search_line_edit = new QLineEdit(this);
+  _search_line_edit->setPlaceholderText (tr ("Type here and press \'Return\' to search"));
+  hboxLayout->addWidget (_search_line_edit);
+
+  _search_check_box = new QCheckBox (tr ("Global search"));
+  hboxLayout->addWidget (_search_check_box);
+
+  connect (_close_tab_button, SIGNAL (clicked ()), this, SLOT (close_tab ()));
+  connect (_tab_bar, SIGNAL (currentChanged (int)), this, SLOT (current_tab_changed (int)));
+  connect (_zoom_in_button, SIGNAL (clicked ()), this, SLOT (zoom_in ()));
+  connect (_zoom_out_button, SIGNAL (clicked ()), this, SLOT (zoom_out ()));
+  connect (_search_line_edit, SIGNAL (returnPressed ()), this, SLOT (search ()));
+
+  resize (500, 300);
+
+  set_info_path ("../../doc/interpreter/octave.info");
+}
+
+void
+webinfo::set_info_path (QString info_path)
+{
+  _parser.set_info_path (info_path);
+  load_node ("Top");
+}
+
+void
+webinfo::load_node (QString node_name)
+{
+  //Check if node has been already opened.
+  for (int i = 0;i < _tab_bar->count (); i++)
+    {
+      if (node_name == _tab_bar->tabText (i))
+        {
+          _tab_bar->setCurrentIndex (i);
+          return;
+        }
+    }
+
+  QString text = _parser.search_node (node_name);
+  int i = _parser.is_ref (node_name);
+  _text_browser = addNewTab (node_name);
+  _text_browser->setHtml (_parser.node_text_to_html (text, i - 1, "anchor"));
+
+  if (i != -1)
+    {
+      _text_browser->scrollToAnchor ("anchor");
+    }
+}
+
+void
+webinfo::link_clicked (const QUrl & link)
+{
+  QString node = link.toString ();
+  load_node (node);
+}
+
+void
+webinfo::current_tab_changed (int index)
+{
+  QVariant data = _tab_bar->tabData (index);
+  _text_browser = (QTextBrowser*) (data.value<void*> ());
+
+  _stacked_widget->setCurrentIndex (_stacked_widget->indexOf (_text_browser));
+
+  if (_text_browser->font () != _font_web)
+    {
+      _text_browser->setFont (_font_web);
+    }
+}
+
+QTextBrowser *
+webinfo::addNewTab(QString name)
+{
+  _text_browser = new QTextBrowser (this);
+  _text_browser->setOpenLinks (false);
+  _text_browser->show ();
+
+  connect (_text_browser, SIGNAL (anchorClicked (const QUrl &)), this, SLOT (link_clicked (const QUrl &)) );
+  disconnect(_tab_bar, SIGNAL (currentChanged(int)), this, SLOT (current_tab_changed (int)));
+
+  int ns = _stacked_widget->addWidget (_text_browser);
+  _stacked_widget->setCurrentIndex (ns);
+
+  int nt = _tab_bar->addTab (name);
+  _tab_bar->setCurrentIndex (nt);
+  QVariant data;
+  data.setValue ( (void*)_text_browser);
+  _tab_bar->setTabData (nt, data);
+
+  connect (_tab_bar, SIGNAL (currentChanged (int)), this, SLOT (current_tab_changed (int)));
+
+  if (_text_browser->font () != _font_web)
+    {
+      _text_browser->setFont (_font_web);
+    }
+  return _text_browser;
+}
+
+void
+webinfo::close_tab ()
+{
+  int index = _tab_bar->currentIndex ();
+  if (_tab_bar->tabText (index) != "Top")
+    closeTab (index);
+}
+
+void
+webinfo::closeTab (int index)
+{
+  QVariant data = _tab_bar->tabData (index);
+  QWidget *w = (QWidget*) (data.value<void*> ());
+  _stacked_widget->removeWidget (w);
+  delete w;
+
+  _tab_bar->removeTab (index);
+}
+
+void
+webinfo::search ()
+{
+  if (_search_check_box->isChecked ())
+    {
+      // Global search
+      QString results = _parser.global_search (_search_line_edit->text (), 5);
+      _text_browser=addNewTab ("Results for: " + _search_line_edit->text ());
+      _text_browser->setHtml (results);
+    }
+  else
+    {
+      // Local search
+      _text_browser->find (_search_line_edit->text ());
+    }
+}
+
+void
+webinfo::zoom_in ()
+{
+  _font_web.setPointSize (_font_web.pointSize() + 1);
+  _text_browser->setFont (_font_web);
+}
+
+void
+webinfo::zoom_out ()
+{
+  _font_web.setPointSize (_font_web.pointSize() - 1);
+  _text_browser->setFont (_font_web);
+}
+
diff --git a/gui/src/qtinfo/webinfo.h b/gui/src/qtinfo/webinfo.h
new file mode 100644
--- /dev/null
+++ b/gui/src/qtinfo/webinfo.h
@@ -0,0 +1,60 @@
+/* Copyright (C) 2009 P.L. Lucas
+ * Copyright (C) 2012 Jacob Dawid <jacob.dawid@gmail.com>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <QTextBrowser>
+#include "parser.h"
+#include <QStackedWidget>
+#include <QTabBar>
+#include <QPushButton>
+#include <QLineEdit>
+#include <QCheckBox>
+#include <QToolButton>
+
+class webinfo : public QWidget
+{
+  Q_OBJECT
+public:
+  webinfo (QWidget *parent = 0);
+  void set_info_path (QString info_path);
+  void load_node (QString node_name);
+
+public slots:
+  void link_clicked (const QUrl &link);
+  void current_tab_changed (int index);
+  void close_tab ();
+  void search ();
+  void zoom_in ();
+  void zoom_out ();
+
+private:
+  QTextBrowser        *_text_browser;
+  QTabBar             *_tab_bar;
+  QStackedWidget      *_stacked_widget;
+  QPushButton         *_close_tab_button;
+  QLineEdit           *_search_line_edit;
+  QCheckBox           *_search_check_box;
+  QToolButton         *_zoom_in_button;
+  QToolButton         *_zoom_out_button;
+
+  parser              _parser;
+  QFont               _font_web;
+
+  QTextBrowser *addNewTab (QString name);
+  void closeTab(int index);
+};
diff --git a/gui/src/resource.qrc b/gui/src/resource.qrc
--- a/gui/src/resource.qrc
+++ b/gui/src/resource.qrc
@@ -15,5 +15,11 @@
         <file>icons/filesaveas.png</file>
         <file>icons/redled.png</file>
         <file>icons/arrow_right.png</file>
+        <file>icons/bookmark.png</file>
+        <file>icons/question.png</file>
+        <file>icons/star.png</file>
+        <file>icons/stop.png</file>
+        <file>icons/zoom-in.png</file>
+        <file>icons/zoom-out.png</file>
     </qresource>
 </RCC>
diff --git a/gui/src/src.pro b/gui/src/src.pro
--- a/gui/src/src.pro
+++ b/gui/src/src.pro
@@ -44,6 +44,7 @@
 INCLUDEPATH         += . \
                        octave-adapter \
                        m-editor \
+                       qtinfo \
                        ../qterminal/libqterminal \
                        /usr/include/qt4 \
                        ../.. \
@@ -83,6 +84,8 @@
     m-editor/lexer-octave-gui.cc \
     m-editor/file-editor.cc \
     m-editor/file-editor-tab.cc \
+    qtinfo/parser.cc \
+    qtinfo/webinfo.cc \
     main-window.cc \
     workspace-view.cc \
     history-dockwidget.cc \
@@ -93,7 +96,8 @@
     welcome-wizard.cc \
     workspace-model.cc \
     terminal-dockwidget.cc \
-    octave-qt-event-listener.cc
+    octave-qt-event-listener.cc \
+    documentation-dockwidget.cc
 
 HEADERS += \
     octave-adapter/octave-link.h \
@@ -105,6 +109,8 @@
     m-editor/file-editor.h \
     m-editor/file-editor-interface.h \
     m-editor/file-editor-tab.h \
+    qtinfo/parser.h \
+    qtinfo/webinfo.h \
     symbol-information.h \
     main-window.h \
     workspace-view.h \
@@ -115,7 +121,8 @@
     welcome-wizard.h \
     workspace-model.h \
     terminal-dockwidget.h \
-    octave-qt-event-listener.h
+    octave-qt-event-listener.h \
+    documentation-dockwidget.h
 
 FORMS += \
     settings-dialog.ui \