Renders a jinja2 template and outputs the result

jjrender.py

#!/usr/bin/env python
# Dependencies: jinja2, pyyaml, docopt
import docopt
usage = """jjrender
Renders a jinja2 template and outputs the result
Pipe the variables in yml format into stdin
Alternatively you can simply paste the tpl after starting jjrender, terminate input with Ctrl+D

Usage: jjrender TEMPLATE

Options:
  -h, --help         show this help
"""
opts = docopt.docopt(usage)

from jinja2 import Template
with open(opts['TEMPLATE'], 'r') as f:
	tpl = Template(f.read())
import sys
stdin = ''.join(sys.stdin.readlines())	
import yaml
data = yaml.safe_load(stdin)
if data is None:
	data = {}
print tpl.render(**data)