This is a nl2br (newline to <BR>) filter, adapted from the Jinja2 example here:
http://jinja.pocoo.org/2/documentation/api#custom-filters
import re
from jinja2 import evalcontextfilter, Markup, escape
_paragraph_re = re.compile(r'(?:\r\n|\r|\n){2,}')
app = Flask(__name__)
@app.template_filter()
@evalcontextfilter
def nl2br(eval_ctx, value):
result = u'\n\n'.join(u'<p>%s</p>' % p.replace('\n', '<br>\n') \
for p in _paragraph_re.split(escape(value)))
if eval_ctx.autoescape:
result = Markup(result)
return result
This snippet by Dan Jacob can be used freely for anything you like. Consider it public domain.