apps/catalogue/helpers.py

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