60 lines
1.6 KiB
Python
Executable File
60 lines
1.6 KiB
Python
Executable File
#! /usr/bin/env python
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"""
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replace variables in a template with specific variables
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"""
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import logging
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import yaml
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def parse_arguments():
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from argparse import ArgumentParser, FileType
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arg_parser = ArgumentParser()
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arg_parser.add_argument("--template", "-t", type=FileType("r"))
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arg_parser.add_argument(
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"--input", "-i", type=FileType("r"), help="yaml format template parameter"
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)
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arg_parser.add_argument(
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"--output", "-o", type=FileType("w"), help="filled in template", default="-"
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)
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return arg_parser.parse_args()
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def inject(template, variables):
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import re
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variable_regex = re.compile("\$([a-zA-Z\_]+)")
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variables_in_template = variable_regex.findall(template)
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# we need to be able to fill in every variable
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assert (v in variables for v in variables_in_template)
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if not all(v in variables_in_template for v in variables):
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logging.warn(
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f"There are unused variables: {filter(lambda v: v not in variables_in_template, [v for v in variables])}"
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)
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filled_template = template
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for variable, value in variables.items():
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filled_template = filled_template.replace(f"${variable}", value)
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return filled_template
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if __name__ == "__main__":
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argv = parse_arguments()
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with argv.input as yaml_stream:
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variables = yaml.safe_load(yaml_stream)
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with argv.template as string_stream:
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template = string_stream.read()
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with argv.output as output_stream:
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output_stream.write(
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inject(template, variables)
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)
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output_stream.close()
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