provide a title that's kindle-safe

core/models.py

@@ -9,6 +9,7 @@ import random
 import urllib
 import urllib2
 from urlparse import urlparse
+import unicodedata
 
 from ckeditor.fields import RichTextField
 from datetime import timedelta, datetime
@@ -1186,6 +1187,21 @@ class Work(models.Model):
         elif self.authors().count()>2:
             return "%s et al." % self.authors()[0].name
         return ''
+    
+    def kindle_safe_title(self):
+        safe = u''
+        nkfd_form = unicodedata.normalize('NFKD', self.title) #unaccent accented letters
+        for c in nkfd_form:
+            ccat = unicodedata.category(c)
+            #print ccat
+            if ccat.startswith('L') or  ccat.startswith('N'): # only letters and numbers
+                if ord(c) > 127:
+                    safe = safe + '#' #a non latin script letter or number
+                else:
+                    safe = safe + c
+            elif not unicodedata.combining(c): #not accents (combining forms)
+                safe = safe + '_' #punctuation
+        return safe
 
     def last_campaign(self):
         # stash away the last campaign to prevent repeated lookups

frontend/views.py

@@ -3185,7 +3185,7 @@ def send_to_kindle(request, work_id, javascript='0'):
     if acq:
         ebook_url = acq.get_mobi_url()
         ebook_format = 'mobi'
-        title = acq.work.title
+        title = acq.work.kindle_safe_title()
     else:
         non_google_ebooks = work.ebooks().exclude(provider='Google Books')
         try:
@@ -3201,8 +3201,7 @@ def send_to_kindle(request, work_id, javascript='0'):
         ebook_url = ebook.url
         ebook_format = ebook.format
         logger.info('ebook: {0}, user_ip: {1}'.format(work_id, request.META['REMOTE_ADDR']))
-        title = ebook.edition.title
-    title = title.replace(' ', '_')
+        title = ebook.edition.work.kindle_safe_title()
     context['ebook_url']=ebook_url
     context['ebook_format']=ebook_format