basic fragment choosing

[wolnelektury.git] / apps / catalogue / utils.py

diff --git a/apps/catalogue/utils.py b/apps/catalogue/utils.py
index acbd778..0fdeaf8 100644 (file)
--- a/apps/catalogue/utils.py
+++ b/apps/catalogue/utils.py
@@ -19,8 +19,8 @@ from os import mkdir, path, unlink
 from errno import EEXIST, ENOENT
 from fcntl import flock, LOCK_EX
 from zipfile import ZipFile
+from traceback import print_exc
 
-from librarian import DocProvider
 from reporting.utils import read_chunks
 from celery.task import task
 import catalogue.models
@@ -60,20 +60,6 @@ class ExistingFile(UploadedFile):
         pass
 
 
-class ORMDocProvider(DocProvider):
-    """Used for getting books' children."""
-
-    def __init__(self, book):
-        self.book = book
-
-    def by_slug_and_lang(self, slug, language):
-        if slug == self.book.slug and language == self.language:
-            return open(self.book.xml_file.path)
-        else:
-            return type(self.book).objects.get(
-                    slug=slug, language=language).xml_file
-
-
 class LockFile(object):
     """
     A file lock monitor class; createas an ${objname}.lock
@@ -159,8 +145,47 @@ def async_build_pdf(book_id, customizations, file_name):
     Accepts the same args as Book.build_pdf, but with book id as first parameter
     instead of Book instance
     """
-    book = catalogue.models.Book.objects.get(id=book_id)
-    print "will gen %s" % DefaultStorage().path(file_name)
-    if not DefaultStorage().exists(file_name):
-        book.build_pdf(customizations=customizations, file_name=file_name)
-    print "done."
+    try:
+        book = catalogue.models.Book.objects.get(id=book_id)
+        print "will gen %s" % DefaultStorage().path(file_name)
+        if not DefaultStorage().exists(file_name):
+            book.build_pdf(customizations=customizations, file_name=file_name)
+        print "done."
+    except Exception, e:
+        print "Error during pdf creation: %s" % e
+        print_exc
+        raise e
+
+
+class MultiQuerySet(object):
+    def __init__(self, *args, **kwargs):
+        self.querysets = args
+        self._count = None
+    
+    def count(self):
+        if not self._count:
+            self._count = sum(len(qs) for qs in self.querysets)
+        return self._count
+    
+    def __len__(self):
+        return self.count()
+        
+    def __getitem__(self, item):
+        try:
+            indices = (offset, stop, step) = item.indices(self.count())
+        except AttributeError:
+            # it's not a slice - make it one
+            return self[item : item + 1][0]
+        items = []
+        total_len = stop - offset
+        for qs in self.querysets:
+            if len(qs) < offset:
+                offset -= len(qs)
+            else:
+                items += list(qs[offset:stop])
+                if len(items) >= total_len:
+                    return items
+                else:
+                    offset = 0
+                    stop = total_len - len(items)
+                    continue