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     @property
  74     def was_merged(self):
  75         "Check if we have gallery size recorded"
  76         return self.dest_size is not None
  77
  78     def merge(self):
  79         if not self.dest:
  80             return self.src
  81         if not self.src:
  82             return self.dest
  83
  84         files = listdir(self.path(self.dest))
  85         files.sort()
  86         self.dest_size = len(files)
  87         files_other = listdir(self.path(self.src))
  88         files_other.sort()
  89         self.src_size = len(files_other)
  90
  91         if files and files_other:
  92             print "compare %s with %s" % (files[-1], files_other[0])
  93             if filecmp.cmp(
  94                     join(self.path(self.dest), files[-1]),
  95                     join(self.path(self.src), files_other[0]),
  96                     False
  97                     ):
  98                 files_other.pop(0)
  99                 self.num_deleted = 1
 100
 101         prefixes = {}
 102         renamed_files = {}
 103         renamed_files_other = {}
 104         last_pfx = -1
 105
 106         # check if all elements of my files have a prefix
 107         files_prefixed = True
 108         for f in files:
 109             p = self.get_prefix(f)
 110             if p:
 111                 if p > last_pfx: last_pfx = p
 112             else:
 113                 files_prefixed = False
 114                 break
 115
 116         # if not, add a 0 prefix to them
 117         if not files_prefixed:
 118             prefixes[0] = 0
 119             for f in files:
 120                 renamed_files[f] = self.set_prefix(f, 0, True)
 121
 122         # two cases here - either all are prefixed or not.
 123         files_other_prefixed = True
 124         for f in files_other:
 125             pfx = self.get_prefix(f)
 126             if pfx is not None:
 127                 if not pfx in prefixes:
 128                     last_pfx += 1
 129                     prefixes[pfx] = last_pfx
 130                 renamed_files_other[f] = self.set_prefix(f, prefixes[pfx])
 131             else:
 132                 # ops, not all files here were prefixed.
 133                 files_other_prefixed = False
 134                 break
 135
 136         # just set a 1- prefix to all of them
 137         if not files_other_prefixed:
 138             for f in files_other:
 139                 renamed_files_other[f] = self.set_prefix(f, 1, True)
 140
 141         # finally, move / rename files.
 142         for frm, to in renamed_files.items():
 143             move(join(self.path(self.dest), frm),
 144                         join(self.path(self.dest), to))
 145         for frm, to in renamed_files_other.items():
 146             move(join(self.path(self.src), frm),
 147                         join(self.path(self.dest), to))
 148
 149         rmtree(join(self.path(self.src)))
 150         return self.dest