[ocrfeeder/master-wip: 2/5] Warn when no OCR engines are found on startup

[Joaquim Manuel Pereira Rocha <jrocha src gnome org>]

commit 94790fe131d787b8ddbf39a370b1cc1d917d5580
Author: Joaquim Rocha <me joaquimrocha com>
Date:   Wed Jul 30 23:56:35 2014 +0200

    Warn when no OCR engines are found on startup

 src/ocrfeeder/studio/studioBuilder.py |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)
---
diff --git a/src/ocrfeeder/studio/studioBuilder.py b/src/ocrfeeder/studio/studioBuilder.py
index 0baaf59..7198068 100644
--- a/src/ocrfeeder/studio/studioBuilder.py
+++ b/src/ocrfeeder/studio/studioBuilder.py
@@ -156,6 +156,9 @@ class Studio:
 
         self._last_images_dir = ''
 
+        if not self.ocr_engines:
+            self.warnNoOCREngines()
+
     def run(self):
         Gdk.threads_init()
         Gtk.main()
@@ -381,6 +384,26 @@ class Studio:
             self.source_images_controler.updateOcrEngines(ocr_engines)
         ocr_dialog.destroy()
 
+    def warnNoOCREngines(self):
+        lib.debug('No OCR engines found')
+        dialog = Gtk.MessageDialog(self.main_window.window,
+                                   Gtk.DialogFlags.MODAL |
+                                   Gtk.DialogFlags.DESTROY_WITH_PARENT,
+                                   Gtk.MessageType.INFO)
+        dialog.set_title(_('No OCR engines available'))
+        dialog.set_markup(_('No OCR engines were found in the system.\n'
+                            'Please make sure you have OCR engines installed '
+                            'and available.'))
+        dialog.add_buttons(_('_Ignore'),
+                           Gtk.ResponseType.CANCEL,
+                           _('_Open OCR Engines Manager Dialog'),
+                           Gtk.ResponseType.OK)
+
+        response = dialog.run()
+        dialog.destroy()
+        if response == Gtk.ResponseType.OK:
+            self.ocrEngines()
+
     def enginesTool(self, widget = None):
         pass