#!/usr/bin/env python3

import argparse
import macresources

def parse_align(x):
    msg = "%r is not 'word', 'longword' or whole number" % x

    if x.lower() == 'word':
        return 2
    elif x.lower() == 'longword':
        return 4

    try:
        y = int(x)
    except ValueError:
        raise argparse.ArgumentTypeError(msg)

    if y < 1:
        raise argparse.ArgumentTypeError(msg)

    return y

parser = argparse.ArgumentParser(description='''
    Compile legacy Mac resources from a subset of the Rez language. Only
    data blocks and $"<hex>" lines are supported. No attempt is made to
    output to the native Mac resource fork, but this can be worked
    around by appending `/..namedfork/rsrc' to the name of an existing
    output file.
''')

parser.add_argument('rezFile', nargs='+', help='resource description files')
parser.add_argument('-o', metavar='outputFile', default='Rez.out', help='default: Rez.out')
parser.add_argument('-align', metavar='word | longword | n', action='store', type=parse_align, default=1)
parser.add_argument('-useDF', action='store_true', help='ignored: data fork is always used')
parser.add_argument('-fakehdr', action='store_true', help='accept fake-header resource')

args = parser.parse_args()

resources = []
for in_path in args.rezFile:
    with open(in_path, 'rb') as f:
        resources.extend(macresources.parse_rez_code(f.read(), fake_header_rsrc=args.fakehdr))

with open(args.o, 'wb') as f:
    f.write(macresources.make_file(resources, align=args.align, fake_header_rsrc=args.fakehdr))