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import urllib

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from formatbytes import formatbytes

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from datetime import datetime

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def iter_is_first (seq) :

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    flag = True

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    for item in seq :

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        yield item, flag

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        flag = False

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def url_for_page (page) :

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    assert page >= 0

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    if page > 0 :

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        return  'index_%d.html' % page

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    else :

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        return 'index.html'

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def tag_for_img (page, img) :

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    return """<a href="%s"><img src="%s" /></a>""" % (page, img)

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def format_filesize (size) :

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    return formatbytes(size, forcekb=False, largestonly=True, kiloname='KiB', meganame='MiB', bytename='B', nospace=False)

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def format_timestamp (ts) :

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    return datetime.fromtimestamp(ts).strftime("%Y-%m-%d %H:%M:%S")

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def format_imgsize (size) :

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    return "%dx%d" % size