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import os, os.path

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import settings

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def isImage (fname) :

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    """

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        Is the given filename likely to be an image file?

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    """

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    fname = fname.lower()

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    base, ext = os.path.splitext(fname)

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    ext = ext.lstrip('.')

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    return ext in settings.IMAGE_EXTS

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def readFile (path) :

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    fo = open(path, 'r')

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    data = fo.read()

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    fo.close()

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    return data

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def fuzzyDecode (bytes) :

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    try :

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        return bytes.decode('utf8')

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    except UnicodeDecodeError :

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        return bytes.decode('latin1', 'replace')

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def readTitleDescr (path) :

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    """

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        Read a title.txt or <imgname>.txt file

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    """

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    if os.path.exists(path) :

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        content = readFile(path)

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        if '---' in content :

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            title, descr = content.split('---', 1)

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        else :

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            title, descr = content, ''

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        title, descr = fuzzyDecode(title), fuzzyDecode(descr)

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        return title.strip(), descr.strip()

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    return u"", u""

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def url (*parts, **kwargs) :

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    abs = kwargs.pop('abs', False)

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    up = kwargs.pop('up', 0)

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    trailing = kwargs.pop('trailing', False)

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    return '/'.join(([""]*int(abs)) + ([".."]*up) + list(parts) + ([""]*int(trailing)))

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url_join = url

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def path_join (*parts) :

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    return os.path.join(*[part for part in parts if part is not None])

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def strip_path (path) :

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    return path.lstrip('.').lstrip('/')

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def mtime (path) :

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    try :

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        return os.stat(path).st_mtime

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    except OSError :

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        # no such file or directory

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        return None

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