/
helpers.py
83 lines (58 loc) · 2.12 KB
/
helpers.py
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from django.utils.translation import ugettext as _
from django.template.defaulttags import CsrfTokenNode
from django.utils.encoding import smart_unicode
from django.core.urlresolvers import reverse
import jinja2
from jingo import register
@register.function
@jinja2.contextfunction
def csrf(context):
"""Equivalent of Django's ``{% crsf_token %}``."""
return jinja2.Markup(CsrfTokenNode().render(context))
@register.filter
def f(string, *args, **kwargs):
"""
Uses ``str.format`` for string interpolation.
>>> {{ "{0} arguments and {x} arguments"|f('positional', x='keyword') }}
"positional arguments and keyword arguments"
"""
string = unicode(string)
return string.format(*args, **kwargs)
@register.filter
def fe(string, *args, **kwargs):
"""Format a safe string with potentially unsafe arguments, then return a
safe string."""
string = unicode(string)
args = [jinja2.escape(smart_unicode(v)) for v in args]
for k in kwargs:
kwargs[k] = jinja2.escape(smart_unicode(kwargs[k]))
return jinja2.Markup(string.format(*args, **kwargs))
@register.filter
def nl2br(string):
"""Turn newlines into <br>."""
if not string:
return ''
return jinja2.Markup('<br>'.join(jinja2.escape(string).splitlines()))
@register.filter
def datetime(t, fmt=None):
"""Call ``datetime.strftime`` with the given format string."""
if fmt is None:
fmt = _('%B %e, %Y')
return smart_unicode(t.strftime(fmt.encode('utf-8'))) if t else u''
@register.filter
def ifeq(a, b, text):
"""Return ``text`` if ``a == b``."""
return jinja2.Markup(text if a == b else '')
@register.filter
def class_selected(a, b):
"""Return ``'class="selected"'`` if ``a == b``."""
return ifeq(a, b, 'class="selected"')
@register.filter
def field_attrs(field_inst, **kwargs):
"""Adds html attributes to django form fields"""
field_inst.field.widget.attrs.update(kwargs)
return field_inst
@register.function(override=False)
def url(viewname, *args, **kwargs):
"""Return URL using django's ``reverse()`` function."""
return reverse(viewname, args=args, kwargs=kwargs)