added XmlUpdater for massive XML updates
[redakcja.git] / 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