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Implement timezone heuristic hack for sony devices

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This commit is contained in:
Charles Haley 2010-07-03 19:19:12 +01:00
parent 502e80c972
commit 0c8e1e2058
1 changed files with 31 additions and 2 deletions
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33
src/calibre/devices/prs505/sony_cache.py
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@ -345,6 +345,7 @@ class XMLCache(object):
debug_print('Updating XML Cache:', i)
root = self.record_roots[i]
lpath_map = self.build_lpath_map(root)
self.timezone_for_dates = None
for book in booklist:
path = os.path.join(self.prefixes[i], *(book.lpath.split('/')))
record = lpath_map.get(book.lpath, None)
@ -458,10 +459,38 @@ class XMLCache(object):
Update the Sony database from the book. This is done if the timestamp in
the db differs from the timestamp on the file.
'''
# It seems that a Sony device can sometimes know what timezone it is in.
# In this case it appears to convert the dates to GMT when it writes
# them to the db. Unfortunately, we can't tell when it is doing this, so
# we use a horrible heuristic to tell. As we check dates, check both
# localtime and gmtime. If neither match, set the date using localtime
# and hope it is right. If one of them matches, then assume that the
# rest of the dates in that db use that timezone.
timestamp = os.path.getmtime(path)
date = strftime(timestamp)
if date != record.get('date', None):
if self.timezone_for_dates is None:
tz = time.localtime
else:
tz = self.timezone_for_dates
date = strftime(timestamp, zone=tz)
rec_date = record.get('date', None)
if date != rec_date:
if self.timezone_for_dates is None:
# We haven't yet identified a timezone. See if gmtime() matches
date = strftime(timestamp, zone=time.gmtime)
if date == rec_date:
# It did. Use gmtime for the rest of the dates.
debug_print("Using GMT TZ for dates")
self.timezone_for_dates = time.gmtime
# We now may or may not have identified a timezone. In either event,
# save the date. If gmtime matched, we are modifying it to itself,
# but that is OK for the one time it happens.
record.set('date', date)
elif self.timezone_for_dates is None:
# Dates matched. Use localtime from here on.
debug_print("Using localtime TZ for dates")
self.timezone_for_dates = tz
record.set('size', str(os.stat(path).st_size))
title = book.title if book.title else _('Unknown')
record.set('title', title)