added ui where you can suppress searching for the djvutxt utility

(if it is not available the pure python txt extractor is used as fallback
anyway)

src/calibre/ebooks/djvu/input.py

@@ -18,18 +18,24 @@ class DJVUInput(InputFormatPlugin):
     author      = 'Anthon van der Neut'
     description = 'Convert OCR-ed DJVU files (.djvu) to HTML'
     file_types  = set(['djvu'])
-    output_encoding = None
+    #output_encoding = None
 
-    recommendations = set(
+    options = set([
-    #    [('page_breaks_before', '/', OptionRecommendation.MED)]
+        OptionRecommendation(name='use_djvutxt', recommended_value=True,
-    )
+            help=_('try to use the djvutxt program and fall back to pure python implementation if it fails or is not available')),
+    ])
+
+    #recommendations = set(
+     #   [('try djvutxt', '/', OptionRecommendation.MED)]
+    #)
 
 
     def convert(self, stream, options, file_ext, log, accelerators):
         stdout = StringIO()
         ppdjvu = True
+        log.debug('options: %d' % (options.use_djvutxt))
         # using djvutxt is MUCH faster, should make it an option
-        if False and os.path.exists('/usr/bin/djvutxt'):
+        if options.use_djvutxt and os.path.exists('/usr/bin/djvutxt'):
             from calibre.ptempfile import PersistentTemporaryFile
             try:
                 fp = PersistentTemporaryFile(suffix='.djvu', prefix='calibre')

src/calibre/gui2/convert/__init__.py

@@ -56,6 +56,7 @@ class Widget(QWidget):
         self._icon = QIcon(self.ICON)
         for name in self._options:
             if not hasattr(self, 'opt_'+name):
+                print dir(self)
                 raise Exception('Option %s missing in %s'%(name,
                     self.__class__.__name__))
             self.connect_gui_obj(getattr(self, 'opt_'+name))

src/calibre/gui2/convert/djvu_input.py

@@ -0,0 +1,22 @@
+# coding: utf-8
+
+__license__   = 'GPL v3'
+__copyright__ = '2011, Anthon van der Neut <A.van.der.Neut@ruamel.eu>'
+
+
+from calibre.gui2.convert.djvu_input_ui import Ui_Form
+from calibre.gui2.convert import Widget, QDoubleSpinBox
+
+class PluginWidget(Widget, Ui_Form):
+
+    TITLE = _('DJVU Input')
+    HELP = _('Options specific to')+' DJVU '+_('input')
+    COMMIT_NAME = 'djvu_input'
+    ICON = I('mimetypes/djvu.png')
+
+    def __init__(self, parent, get_option, get_help, db=None, book_id=None):
+        Widget.__init__(self, parent,
+            ['use_djvutxt', ])
+        self.db, self.book_id = db, book_id
+        self.initialize_options(get_option, get_help, db, book_id)
+

src/calibre/gui2/convert/djvu_input.ui

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Form</class>
+ <widget class="QWidget" name="Form">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="1" column="0">
+    <widget class="QCheckBox" name="opt_use_djvutxt">
+     <property name="text">
+      <string>Use &amp;djvutxt</string>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>