make-modules

#!/usr/bin/env python3

import sys
import json
from hcl2.parser import hcl2

display_path = '<stdin>' if len(sys.argv) < 2 else sys.argv[1]
path = sys.stdin if len(sys.argv) < 2 else open(sys.argv[1], 'r')
data = hcl2.parse(path.read())
indent = 2
locals_block = {
    '//': ['This file was auto-generated by command:', f'$ {sys.argv[0]} {display_path}']
}

def update(d, parents=[]):
    for k, v in d.items():
        if isinstance(v, dict):
            d[k] = update(d[k], parents + [k])
        else:
            path = '.'.join(parents + [k])
            d[k] = f'${{try(var.modules.{path}, var.modules_defaults.{path})}}'
    return d

for variables in data['variable']:
    for var_name, var_value in variables.items():
        if var_name != 'modules_defaults':
            continue
        default = var_value['default']
        locals_block['locals'] = { 'modules': update(default) }

print(json.dumps(locals_block,indent=indent))