- inheriting covers after parents,

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

diff --git a/apps/catalogue/utils.py b/apps/catalogue/utils.py
index 9de4eaa..1ac0ee8 100644 (file)
--- a/apps/catalogue/utils.py
+++ b/apps/catalogue/utils.py
@@ -44,6 +44,25 @@ def split_tags(tags):
     return result
 
 
+def get_dynamic_path(media, filename, ext=None, maxlen=100):
+    from slughifi import slughifi
+
+    # how to put related book's slug here?
+    if not ext:
+        # BookMedia case
+        ext = media.formats[media.type].ext
+    if media is None or not media.name:
+        name = slughifi(filename.split(".")[0])
+    else:
+        name = slughifi(media.name)
+    return 'book/%s/%s.%s' % (ext, name[:maxlen-len('book/%s/.%s' % (ext, ext))-4], ext)
+
+
+# TODO: why is this hard-coded ?
+def book_upload_path(ext=None, maxlen=100):
+    return lambda *args: get_dynamic_path(*args, ext=ext, maxlen=maxlen)
+
+
 class ExistingFile(UploadedFile):
 
     def __init__(self, path, *args, **kwargs):
@@ -74,7 +93,7 @@ class LockFile(object):
         try:
             unlink(self.lockname)
         except OSError as oe:
-            if oe.errno != oe.EEXIST:
+            if oe.errno != EEXIST:
                 raise oe
         self.lock.close()
 
@@ -257,3 +276,27 @@ def clear_custom_pdf(book):
     """
     from waiter.utils import clear_cache
     clear_cache('book/%s' % book.slug)
+
+
+class AppSettings(object):
+    """Allows specyfying custom settings for an app, with default values.
+
+    Just subclass, set some properties and instantiate with a prefix.
+    Getting a SETTING from an instance will check for prefix_SETTING
+    in project settings if set, else take the default. The value will be
+    then filtered through _more_SETTING method, if there is one.
+
+    """
+    def __init__(self, prefix):
+        self._prefix = prefix
+
+    def __getattribute__(self, name):
+        if name.startswith('_'):
+            return object.__getattribute__(self, name)
+        value = getattr(settings,
+                         "%s_%s" % (self._prefix, name),
+                         object.__getattribute__(self, name))
+        more = "_more_%s" % name
+        if hasattr(self, more):
+            value = getattr(self, more)(value)
+        return value