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#!/usr/bin/python
# This file is in the public domain.
"""
Expand Jinja2 templates based on JSON input.
First command-line argument must be the JSON input.
The tool reads the template from stdin and writes
the expanded output to stdout.
@author Christian Grothoff
"""
import sys
import json
import jinja2
from jinja2 import BaseLoader
class StdinLoader(BaseLoader):
def __init__ (self):
self.path = '-'
def get_source(self, environment, template):
source = sys.stdin.read().decode('utf-8')
return source, self.path, lambda: false
jsonFile = open (sys.argv[1], 'r')
jsonData = json.load(jsonFile)
jinjaEnv = jinja2.Environment(loader=StdinLoader(),
lstrip_blocks=True,
trim_blocks=True,
undefined=jinja2.StrictUndefined,
autoescape=False)
tmpl = jinjaEnv.get_template('stdin');
print(tmpl.render(data = jsonData))
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