From 32bcac2147ffa344fb58bcc97859b9452ee99ff8 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 30 May 2011 22:49:13 -0600
Subject: [PATCH 1/2] When deleting all formats except ..., do not delete if it
 leaves a book with no formats

---
 src/calibre/gui2/actions/delete.py | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/calibre/gui2/actions/delete.py b/src/calibre/gui2/actions/delete.py
index 718f0737b3..619a8a1031 100644
--- a/src/calibre/gui2/actions/delete.py
+++ b/src/calibre/gui2/actions/delete.py
@@ -161,9 +161,12 @@ class DeleteAction(InterfaceAction):
                 continue
             bfmts = set([x.lower() for x in bfmts.split(',')])
             rfmts = bfmts - set(fmts)
-            for fmt in rfmts:
-                self.gui.library_view.model().db.remove_format(id, fmt,
-                        index_is_id=True, notify=False)
+            if bfmts - rfmts:
+                # Do not delete if it will leave the book with no
+                # formats
+                for fmt in rfmts:
+                    self.gui.library_view.model().db.remove_format(id, fmt,
+                            index_is_id=True, notify=False)
         self.gui.library_view.model().refresh_ids(ids)
         self.gui.library_view.model().current_changed(self.gui.library_view.currentIndex(),
                 self.gui.library_view.currentIndex())

From 775c63bd39497eb7c5933b9ddaf91758e4ce20e8 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 30 May 2011 22:53:15 -0600
Subject: [PATCH 2/2] ...

---
 src/calibre/gui2/actions/delete.py         | 3 ++-
 src/calibre/gui2/dialogs/select_formats.py | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/calibre/gui2/actions/delete.py b/src/calibre/gui2/actions/delete.py
index 619a8a1031..43465512e0 100644
--- a/src/calibre/gui2/actions/delete.py
+++ b/src/calibre/gui2/actions/delete.py
@@ -152,7 +152,8 @@ class DeleteAction(InterfaceAction):
         if not ids:
             return
         fmts = self._get_selected_formats(
-            '<p>'+_('Choose formats <b>not</b> to be deleted'), ids)
+            '<p>'+_('Choose formats <b>not</b> to be deleted.<p>Note that '
+                'this will never remove all formats from a book.'), ids)
         if fmts is None:
             return
         for id in ids:
diff --git a/src/calibre/gui2/dialogs/select_formats.py b/src/calibre/gui2/dialogs/select_formats.py
index 5934c8c0f9..aea56ad196 100644
--- a/src/calibre/gui2/dialogs/select_formats.py
+++ b/src/calibre/gui2/dialogs/select_formats.py
@@ -44,7 +44,7 @@ class SelectFormats(QDialog):
         self.setLayout(self._l)
         self.setWindowTitle(_('Choose formats'))
         self._m = QLabel(msg)
-        self._m.setWordWrap = True
+        self._m.setWordWrap(True)
         self._l.addWidget(self._m)
         self.formats = Formats(fmt_list)
         self.fview = QListView(self)