GUI: Convert, check for NoSupportedInputFormats.

src/calibre/gui2/tools.py

@@ -11,11 +11,13 @@ from PyQt4.Qt import QDialog
 
 from calibre.ptempfile import PersistentTemporaryFile
 from calibre.gui2.convert import load_specifics
+from calibre.gui2.convert.single import NoSupportedInputFormats
 from calibre.gui2.convert.single import Config as SingleConfig
 
 def convert_single_ebook(parent, db, row_ids, auto_conversion=False):
     changed = False
     jobs = []
+    bad = []
     
     total = len(row_ids)
     if total == 0:
@@ -25,6 +27,7 @@ def convert_single_ebook(parent, db, row_ids, auto_conversion=False):
     for i, row_id in enumerate(row_ids):
         temp_files = []
 
+        try:
             d = SingleConfig(parent, db, row_id)
             
             if auto_conversion:
@@ -52,6 +55,17 @@ def convert_single_ebook(parent, db, row_ids, auto_conversion=False):
                 jobs.append(('ebook-convert', args, desc, d.output_format.upper(), row_id, temp_files))
 
                 changed = True
+        except NoSupportedInputFormats:
+            bad.append(row_id)
+
+    if bad != []:
+        res = []
+        for id in bad:
+            title = db.title(id, True)
+            res.append('<li>%s</li>'%title)
+
+        msg = _('<p>Could not convert %d of %d books, because no suitable source format was found.<ul>%s</ul>')%(len(res), total, '\n'.join(res))
+        warning_dialog(parent, _('Could not convert some books'), msg).exec_()
 
     return jobs, changed