Librarian in regular requirements.

[redakcja.git] / apps / catalogue / helpers.py

diff --git a/apps/catalogue/helpers.py b/apps/catalogue/helpers.py
index df64ade..d340b46 100644 (file)
--- a/apps/catalogue/helpers.py
+++ b/apps/catalogue/helpers.py
@@ -1,5 +1,11 @@
 from datetime import date
 from functools import wraps
+from os.path import join
+from os import listdir, stat
+from shutil import move, rmtree
+from django.conf import settings
+import re
+import filecmp
 
 from django.db.models import Count
 
@@ -36,3 +42,107 @@ def parse_isodate(isodate):
         return date(*[int(p) for p in isodate.split('-')])
     except (AttributeError, TypeError, ValueError):
         raise ValueError("Not a date in ISO format.")
+
+
+class GalleryMerger(object):
+    def __init__(self, dest_gallery, src_gallery):
+        self.dest = dest_gallery
+        self.src = src_gallery
+        self.dest_size = None
+        self.src_size = None
+        self.num_deleted = 0
+
+    @staticmethod
+    def path(gallery):
+        return join(settings.MEDIA_ROOT, settings.IMAGE_DIR, gallery)
+
+    @staticmethod
+    def get_prefix(name):
+        m = re.match(r"^([0-9])-", name)
+        if m:
+            return int(m.groups()[0])
+        return None
+
+    @staticmethod
+    def set_prefix(name, prefix, always=False):
+        m = not always and re.match(r"^([0-9])-", name)
+        return "%1d-%s" % (prefix, m and name[2:] or name)
+
+    @property
+    def was_merged(self):
+        "Check if we have gallery size recorded"
+        return self.dest_size is not None
+
+    def merge(self):
+        if not self.dest:
+            return self.src
+        if not self.src:
+            return self.dest
+
+        files = listdir(self.path(self.dest))
+        files.sort()
+        self.dest_size = len(files)
+        files_other = listdir(self.path(self.src))
+        files_other.sort()
+        self.src_size = len(files_other)
+
+        if files and files_other:
+            print "compare %s with %s" % (files[-1], files_other[0])
+            if filecmp.cmp(
+                    join(self.path(self.dest), files[-1]),
+                    join(self.path(self.src), files_other[0]),
+                    False
+                    ):
+                files_other.pop(0)
+                self.num_deleted = 1
+
+        prefixes = {}
+        renamed_files = {}
+        renamed_files_other = {}
+        last_pfx = -1
+
+        # check if all elements of my files have a prefix
+        files_prefixed = True
+        for f in files:
+            p = self.get_prefix(f)
+            if p:
+                if p > last_pfx: last_pfx = p
+            else:
+                files_prefixed = False
+                break
+
+        # if not, add a 0 prefix to them
+        if not files_prefixed:
+            prefixes[0] = 0
+            for f in files:
+                renamed_files[f] = self.set_prefix(f, 0, True)
+
+        # two cases here - either all are prefixed or not.
+        files_other_prefixed = True
+        for f in files_other:
+            pfx = self.get_prefix(f)
+            if pfx is not None:
+                if not pfx in prefixes:
+                    last_pfx += 1
+                    prefixes[pfx] = last_pfx
+                renamed_files_other[f] = self.set_prefix(f, prefixes[pfx])
+            else:
+                # ops, not all files here were prefixed.
+                files_other_prefixed = False
+                break
+
+        # just set a 1- prefix to all of them
+        if not files_other_prefixed:
+            for f in files_other:
+                renamed_files_other[f] = self.set_prefix(f, 1, True)
+
+        # finally, move / rename files.
+        for frm, to in renamed_files.items():
+            move(join(self.path(self.dest), frm),
+                        join(self.path(self.dest), to))
+        for frm, to in renamed_files_other.items():
+            move(join(self.path(self.src), frm),
+                        join(self.path(self.dest), to))            
+
+        rmtree(join(self.path(self.src)))
+        return self.dest