emailtemplate.py

import re


def format_price(p):
    return ('%.2f' % p).replace('.', ',')


def format_price_set(ps):
    return '/'.join(map(format_price, sorted(ps)))


def format_count(c):
    return ('%.2f' % c).rstrip('0').rstrip('.').replace('.', ',')


def format(template, context):
    r'''
    >>> format('Hello #TARGET#!', dict(TARGET='world'))
    'Hello world!'
    >>> format('Hello.#SKJULNUL:# Value is #V#',
    ...        dict(V='42'))
    'Hello. Value is 42'
    >>> format('Hello.#SKJULNUL:# Value is #V#\nHello again.',
    ...        dict(V='0'))
    'Hello.\nHello again.'
    >>> format('#SKJULNUL:#Values #X# #Y#',
    ...        dict(X='1', Y='2'))
    'Values 1 2'
    >>> format('#SKJULNUL:#Values #X# #Y#',
    ...        dict(X='1', Y='0'))
    ''
    '''
    pattern = r'#([A-Z][^#]*)#'
    res = re.sub(r'\r\n|\n|\r', '\n', template)

    def hide_zero(s):
        if any(context[m.group(1)].strip('0,.') == ''
               for m in re.finditer(pattern, s)):
            return ''
        else:
            return s

    res = re.sub(r'#SKJULNUL:#(.*\n?)',
                 lambda mo: hide_zero(mo.group(1)), res)
    res = re.sub(pattern, lambda mo: context[mo.group(1)], res)
    res = re.sub(r'\n\n+', '\n\n', res)
    return res