util.py

#!/usr/bin/env python
#-*- coding: utf-8 -*-
"""
utility functions and classes
"""
import codecs
import csv
import datetime


# from https://gist.github.com/nzjrs/207624
def humanize_date_difference(now, otherdate=None, offset=None):
    if otherdate:
        dt = otherdate - now
        offset = dt.seconds + (dt.days * 60 * 60 * 24)
    if offset:
        delta_s = offset % 60
        offset /= 60
        delta_m = offset % 60
        offset /= 60
        delta_h = offset % 24
        offset /= 24
        delta_d = offset
    else:
        raise ValueError("Must supply otherdate or offset (from now)")

    if delta_d > 1:
        if delta_d > 6:
            date = now + datetime.timedelta(days=-delta_d, hours=-delta_h,
                                            minutes=-delta_m)
            return date.strftime('%A, %Y %B %m, %H:%I')
        else:
            wday = now + datetime.timedelta(days=-delta_d)
            return wday.strftime('%A')
    if delta_d == 1:
        return "Yesterday"
    if delta_h > 0:
        return "%dh%dm ago" % (delta_h, delta_m)
    if delta_m > 0:
        return "%dm%ds ago" % (delta_m, delta_s)
    else:
        return "%ds ago" % delta_s


# from https://gist.github.com/eightysteele/1174811
class UTF8Recoder:
    """
    Iterator that reads an encoded stream and reencodes the input to UTF-8.
    """

    def __init__(self, f, encoding):
        self.reader = codecs.getreader(encoding)(f)

    def __iter__(self):
        return self

    def next(self):
        n = self.reader.next()
        n = n.encode("utf-8")
        return n


# from https://gist.github.com/eightysteele/1174811
class UnicodeDictReader:
    """
    A CSV reader which will iterate over lines in the CSV file "f",
    which is encoded in the given encoding.
    """

    def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
        f = UTF8Recoder(f, encoding)
        self.reader = csv.reader(f, dialect=dialect, **kwds)
        self.header = self.reader.next()

    def next(self):
        row = self.reader.next()
        vals = [unicode(s, "utf-8") for s in row]
        return dict((self.header[x], vals[x]) for x in range(len(self.header)))

    def __iter__(self):
        return self