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#!/usr/bin/python3
# This file is in the public domain.
"""Expand Jinja2 templates based on JSON input.
The tool then reads the template from stdin and writes the expanded
output to stdout.
TODO: proper installation, man page, error handling, --help option.
@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()
return source, self.path, lambda: false
jsonFile1 = open (sys.argv[1], 'r')
jsonData1 = json.load(jsonFile1)
jinjaEnv = jinja2.Environment(loader=StdinLoader(),
lstrip_blocks=True,
trim_blocks=True,
undefined=jinja2.StrictUndefined,
autoescape=False)
tmpl = jinjaEnv.get_template('stdin');
try:
print(tmpl.render(data = jsonData1))
except jinja2.TemplateSyntaxError as error:
print("Template syntax error: {error.message} on line {error.lineno}.".format(error=error))
exit(1)
except jinja2.UndefinedError as error:
print("Template undefined error: {error.message}.".format(error=error))
exit(1)
except TypeError as error:
print("Template type error: {0}.".format(error.args[0]))
exit(1)
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