#!/usr/bin/python3

import sys
import json

from signal import signal, SIGPIPE, SIG_DFL
from vyos.configtree import ConfigTree

signal(SIGPIPE,SIG_DFL)

config_string = None
if (len(sys.argv) == 1):
    # If no argument given, act as a pipe
    config_string = sys.stdin.read()
else:
    file_name = sys.argv[1]
    try:
        with open(file_name, 'r') as f:
            config_string = f.read()
    except OSError as e:
        print("Could not read config file {0}: {1}".format(file_name, e), file=sys.stderr)

# This script is usually called with the output of "cli-shell-api showCfg", which does not
# escape backslashes. "ConfigTree()" expects escaped backslashes when parsing a config
# string (and also prints them itself). Therefore this script would fail.
# Manually escape backslashes here to handle backslashes in any configuration strings
# properly. The alternative would be to modify the output of "cli-shell-api showCfg",
# but that may be break other things who rely on that specific output.
config_string = config_string.replace("\\", "\\\\")

try:
    config = ConfigTree(config_string)
    json_str = config.to_json()
    # Pretty print
    json_str = json.dumps(json.loads(json_str), indent=4, sort_keys=True)
except ValueError as e:
    print("Could not parse the config file: {0}".format(e), file=sys.stderr)
    sys.exit(1)

print(json_str)