import sys, re

def parse_env(path):
    pairs = []
    with open(path) as f:
        for line in f:
            line = line.strip()
            if not line or line.startswith('#') or '=' not in line:
                continue
            k, _, v = line.partition('=')
            k = k.strip(); v = v.strip()
            if (v.startswith("'") and v.endswith("'")) or \
               (v.startswith('"') and v.endswith('"')):
                v = v[1:-1]
            pairs.append((k, v))
    return pairs

def merge_envs(base_path, override_path):
    """Merge two env files. Keys in override_path win over base_path."""
    base = dict(parse_env(base_path))
    override = dict(parse_env(override_path))
    merged = {**base, **override}
    return list(merged.items())

mode = sys.argv[1]
if mode == 'export':
    for k, v in parse_env(sys.argv[2]):
        print('export {}={}'.format(k, repr(v)))
elif mode == 'export_merged':
    # export_merged <global.env> <stack.env>
    for k, v in merge_envs(sys.argv[2], sys.argv[3]):
        print('export {}={}'.format(k, repr(v)))
elif mode == 'vars':
    print(' '.join('$' + k for k, v in parse_env(sys.argv[2])))
elif mode == 'vars_merged':
    # vars_merged <global.env> <stack.env>
    print(' '.join('$' + k for k, v in merge_envs(sys.argv[2], sys.argv[3])))
elif mode == 'strip':
    t = sys.stdin.read()
    t = re.sub(r'[ \t]*env_file:[ \t]*\n([ \t]+-[^\n]*\n)+', '', t)
    sys.stdout.write(t)