import os, json

path_files = 'lib/'
json_file = 'lang/en.json'
file_extension = '.dart'

files = []
keys = []

for r, d, f in os.walk(path_files):
    for file in f:
        if file_extension in file:
            files.append(os.path.join(r, file))

with open(json_file) as f:
    data = json.load(f)
    keys = data.keys()


keys_usages = {}

for single_key in keys:
    keys_usages[single_key] = 0
    for single_file in files:
        with open(single_file) as f:
            text = f.read()
            if "'{}'".format(single_key) in text or '"{}"'.format(single_key) in text:
                keys_usages[single_key] += 1

for key in keys_usages:
    if keys_usages[key] == 0:
        print("Niewykorzystany: "+key)