import os, os.path

import settings

"""
    Miscellaneous utilities
"""

def isImage (fname) :
    """
        Is the given filename likely to be an image file?
    """

    fname = fname.lower()
    base, ext = os.path.splitext(fname)
    ext = ext.lstrip('.')

    return ext in settings.IMAGE_EXTS

def readFile (path) :
    fo = open(path, 'r')
    data = fo.read()
    fo.close()

    return data

def fuzzyDecode (bytes) :
    try :
        return bytes.decode('utf8')
    except UnicodeDecodeError :
        return bytes.decode('latin1', 'replace')

def readTitleDescr (path) :
    """
        Read a title.txt or <imgname>.txt file
    """

    if os.path.exists(path) :
        content = readFile(path)

        if '---' in content :
            title, descr = content.split('---', 1)
        else :
            title, descr = content, ''
        
        title, descr = fuzzyDecode(title), fuzzyDecode(descr)

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

    return u"", u""

def url (*parts, **kwargs) :
    abs = kwargs.pop('abs', False)
    up = kwargs.pop('up', 0)
    trailing = kwargs.pop('trailing', False)
    
    return '/'.join(([""]*int(abs)) + ([".."]*up) + list(parts) + ([""]*int(trailing)))

url_join = url

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

def strip_path (path) :
    return path.lstrip('.').lstrip('/')

def mtime (path) :
    try :
        return os.stat(path).st_mtime
    except OSError :
        # no such file or directory
        return None