Warn user is she's importing a duplicate and ask for confirmation.

src/libprs500/gui2/__init__.py

@@ -47,6 +47,12 @@ def error_dialog(parent, title, msg):
     d.setIconPixmap(QPixmap(':/images/dialog_error.svg'))
     return d
 
+def question_dialog(parent, title, msg):
+    d = QMessageBox(QMessageBox.Question, title, msg, QMessageBox.Yes|QMessageBox.No,
+                    parent)
+    d.setIconPixmap(QPixmap(':/images/dialog_information.svg'))
+    return d
+
 def qstring_to_unicode(q):
     return unicode(q)
 

src/libprs500/gui2/images.qrc

@@ -8,6 +8,7 @@
         <file>images/convert.svg</file>
         <file>images/dialog_error.svg</file>
         <file>images/dialog_warning.svg</file>
+        <file>images/dialog_information.svg</file>
         <file>images/document_open.svg</file>
         <file>images/edit_input.svg</file>
         <file>images/forward.svg</file>

src/libprs500/gui2/library.py

@@ -130,8 +130,9 @@ class BooksModel(QAbstractTableModel):
         self.db = None
         self.reset()
         
-    def add_books(self, paths, formats, metadata, uris=[]):
+    def add_books(self, paths, formats, metadata, uris=[], add_duplicates=False):
-        self.db.add_books(paths, formats, metadata, uris)
+        return self.db.add_books(paths, formats, metadata, uris, 
+                                 add_duplicates=add_duplicates)
         
     def row_indices(self, index):
         ''' Return list indices of all cells in index.row()'''

src/libprs500/gui2/main.py

@@ -31,7 +31,7 @@ from libprs500.ebooks.lrf.any.convert_from import main as _any2lrf
 from libprs500.devices.errors import FreeSpaceError
 from libprs500.devices.interface import Device
 from libprs500.gui2 import APP_UID, warning_dialog, choose_files, error_dialog, \
-                           initialize_file_icon_provider, \
+                           initialize_file_icon_provider, question_dialog,\
                            pixmap_to_data, choose_dir, ORG_NAME, \
                            qstring_to_unicode, set_sidebar_directories
 from libprs500 import iswindows, isosx
@@ -309,7 +309,14 @@ class Main(MainWindow, Ui_MainWindow):
         
         if not to_device:
             model = self.current_view().model()
-            model.add_books(paths, formats, metadata)
+            duplicates = model.add_books(paths, formats, metadata)
+            if duplicates:
+                files = _('<p>Books with the same title as the following already exist in the database. Add them anyway?<ul>')
+                for mi in duplicates[2]:
+                    files += '<li>'+mi.title+'</li>\n'
+                d = question_dialog(self, _('Duplicates found!'), files+'</ul></p>')
+                if d.exec_() == QMessageBox.Yes:
+                    model.add_books(*duplicates, **dict(add_duplicates=True))
             model.resort()
             model.research()
         else:

src/libprs500/library/database.py

@@ -1105,17 +1105,22 @@ ALTER TABLE books ADD COLUMN isbn TEXT DEFAULT "" COLLATE NOCASE;
                               (id, usize, sqlite.Binary(data)))
         self.conn.commit()
     
-    def add_books(self, paths, formats, metadata, uris=[]):
+    def add_books(self, paths, formats, metadata, uris=[], add_duplicates=True):
         '''
         Add a book to the database. self.data and self.cache are not updated.
         '''
         formats, metadata, uris = iter(formats), iter(metadata), iter(uris)
+        duplicates = []
         for path in paths:
             mi = metadata.next()
+            format = formats.next()
             try:
                 uri = uris.next()
             except StopIteration:
                 uri = None
+            if not add_duplicates and self.conn.execute('SELECT id FROM books where title=?', (mi.title,)).fetchone():
+                duplicates.append((path, format, mi, uri))
+                continue
             series_index = 1 if mi.series_index is None else mi.series_index
             obj = self.conn.execute('INSERT INTO books(title, uri, series_index) VALUES (?, ?, ?)', 
                               (mi.title, uri, series_index))
@@ -1141,11 +1146,19 @@ ALTER TABLE books ADD COLUMN isbn TEXT DEFAULT "" COLLATE NOCASE;
             stream.seek(0, 2)
             usize = stream.tell()
             stream.seek(0)
-            format = formats.next()
+            
             self.conn.execute('INSERT INTO data(book, format, uncompressed_size, data) VALUES (?,?,?,?)',
                               (id, format, usize, sqlite.Binary(compress(stream.read()))))
             stream.close()
         self.conn.commit()
+        if duplicates:
+            paths    = tuple(duplicate[0] for duplicate in duplicates)
+            formats  = tuple(duplicate[1] for duplicate in duplicates)
+            metadata = tuple(duplicate[2] for duplicate in duplicates)
+            uris     = tuple(duplicate[3] for duplicate in duplicates)
+            return (paths, formats, metadata, uris)
+        return None
+            
         
         
     def index(self, id, cache=False):