apps/catalogue/helpers.py

   1 from datetime import date
   2 from functools import wraps
   3 from os.path import join
   4 from os import listdir, stat
   5 from shutil import move, rmtree
   6 from django.conf import settings
   7 import re
   8 import filecmp
   9
  10 from django.db.models import Count
  11
  12
  13 def active_tab(tab):
  14     """
  15         View decorator, which puts tab info on a request.
  16     """
  17     def wrapper(f):
  18         @wraps(f)
  19         def wrapped(request, *args, **kwargs):
  20             request.catalogue_active_tab = tab
  21             return f(request, *args, **kwargs)
  22         return wrapped
  23     return wrapper
  24
  25
  26 def cached_in_field(field_name):
  27     def decorator(f):
  28         @property
  29         @wraps(f)
  30         def wrapped(self, *args, **kwargs):
  31             value = getattr(self, field_name)
  32             if value is None:
  33                 value = f(self, *args, **kwargs)
  34                 type(self)._default_manager.filter(pk=self.pk).update(**{field_name: value})
  35             return value
  36         return wrapped
  37     return decorator
  38
  39
  40 def parse_isodate(isodate):
  41     try:
  42         return date(*[int(p) for p in isodate.split('-')])
  43     except (AttributeError, TypeError, ValueError):
  44         raise ValueError("Not a date in ISO format.")
  45
  46
  47 class GalleryMerger(object):
  48     def __init__(self, dest_gallery, src_gallery):
  49         assert isinstance(dest_gallery, str)
  50         assert isinstance(src_gallery, str)
  51         self.dest = dest_gallery
  52         self.src = src_gallery
  53         self.dest_size = None
  54         self.src_size = None
  55         self.num_deleted = 0
  56
  57     @staticmethod
  58     def path(gallery):
  59         return join(settings.MEDIA_ROOT, settings.IMAGE_DIR, gallery)
  60
  61     @staticmethod
  62     def get_prefix(name):
  63         m = re.match(r"^([0-9])-", name)
  64         if m:
  65             return int(m.groups()[0])
  66         return None
  67
  68     @staticmethod
  69     def set_prefix(name, prefix, always=False):
  70         m = not always and re.match(r"^([0-9])-", name)
  71         return "%1d-%s" % (prefix, m and name[2:] or name)
  72
  73     def merge(self):
  74         if not self.dest:
  75             return self.src
  76         if not self.src:
  77             return self.dest
  78
  79         files = listdir(self.path(self.dest))
  80         self.dest_size = len(files)
  81         files_other = listdir(self.path(self.src))
  82         self.src_size = len(files_other)
  83
  84         if files and files_other:
  85             print "compare %s with %s" % (files[-1], files_other[0])
  86             if filecmp.cmp(
  87                     join(self.path(self.dest), files[-1]),
  88                     join(self.path(self.src), files_other[0]),
  89                     False
  90                     ):
  91                 files_other.pop(0)
  92                 self.num_deleted = 1
  93
  94         prefixes = {}
  95         renamed_files = {}
  96         renamed_files_other = {}
  97         last_pfx = -1
  98
  99         # check if all elements of my files have a prefix
 100         files_prefixed = True
 101         for f in files:
 102             p = self.get_prefix(f)
 103             if p:
 104                 if p > last_pfx: last_pfx = p
 105             else:
 106                 files_prefixed = False
 107                 break
 108
 109         # if not, add a 0 prefix to them
 110         if not files_prefixed:
 111             prefixes[0] = 0
 112             for f in files:
 113                 renamed_files[f] = self.set_prefix(f, 0, True)
 114
 115         # two cases here - either all are prefixed or not.
 116         files_other_prefixed = True
 117         for f in files_other:
 118             pfx = self.get_prefix(f)
 119             if pfx is not None:
 120                 if not pfx in prefixes:
 121                     last_pfx += 1
 122                     prefixes[pfx] = last_pfx
 123                 renamed_files_other[f] = self.set_prefix(f, prefixes[pfx])
 124             else:
 125                 # ops, not all files here were prefixed.
 126                 files_other_prefixed = False
 127                 break
 128
 129         # just set a 1- prefix to all of them
 130         if not files_other_prefixed:
 131             for f in files_other:
 132                 renamed_files_other[f] = self.set_prefix(f, 1, True)
 133
 134         # finally, move / rename files.
 135         from nose.tools import set_trace
 136         #        set_trace()
 137         for frm, to in renamed_files.items():
 138             move(join(self.path(self.dest), frm),
 139                         join(self.path(self.dest), to))
 140         for frm, to in renamed_files_other.items():
 141             move(join(self.path(self.src), frm),
 142                         join(self.path(self.dest), to))
 143
 144         rmtree(join(self.path(self.src)))
 145         return self.dest