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#!/usr/bin/python
'''Convert plist from XML to OpenStep format'''
# Version: 2
# Changes:
#   * convert to Python 3 retaining some Python 2 compatibility
#   * quote strings less (thanks to Svengali)
#   * optimize handling of lists: make the 1st item special, not the last one
#   * more comments
#   * assorted cosmetic changes

import sys

# this script requires at least Python 2.6
assert sys.version_info >= (2, 6)

import re
from plistlib import readPlist  # using deprecated method to retain
                                # compatibility with Python 2

# Change these as needed.
# plist file name can also be passed as parameter on command line
FILENAME = 'shipyard.plist' # name of the plist file to be converted
NEWSUFFIX = '-ns'           # added to FILENAME to produce output file name
NONWORD = re.compile(r'\W') # if keys contain this pattern, they'll be
			    # put in quotes (the keys on the outmost
			    # level are always quoted)

def write_dict(fs, dct, lvl):
    '''Writes dictionary into plist file fs. Recursion as needed'''
    fs.write('{\n')
    for k, v in sorted(dct.items()):
        q = '"' if lvl == 0 or NONWORD.search(k) else ''
        fs.write((lvl+1)*'\t'+'{quote}{key}{quote} = '.format(
            quote=q, key=k))
        if isinstance(v, list):
            write_list(fs, v, lvl+1)
        elif isinstance(v, dict):
            write_dict(fs, v, lvl+1)
        else:
            q = '"' if isinstance(v, str) else ''
            fs.write('{quote}{val}{quote}'.format(
                quote=q,
                val=v if not isinstance(v, bool) else 'yes' if v else 'no'))
        fs.write(';\n')
    fs.write(lvl*'\t'+'}')

def write_list(fs, lst, lvl):
    '''Writes list as array into plist file fs. Recursion as needed'''
    fs.write('(')
    first = True
    for i in lst:
        if first:
            first = False
        else:
            fs.write(',')
        fs.write('\n' + (lvl+1)*'\t')
        if isinstance(i, list):
            write_list(fs, i, lvl+1)
        elif isinstance(i, dict):
            write_dict(fs, i, lvl+1)
        else:
            q = '"' if isinstance(i, str) else ''
            fs.write('{quote}{item}{quote}'.format(
                quote=q, item=i))
    fs.write('\n' + lvl*'\t' + ')')

def main(args):
    '''Main conversion routine'''
    # Either get the plist file name from command line or use the default
    filename = args[0] if args else FILENAME

    # Intentionally using deprecated API to retain compatibility with Python 2
    pl = readPlist(filename)
    level = 0

    with open(filename + NEWSUFFIX, 'w') as f:
        if isinstance(pl, list):
            write_list(f, pl, level)
        elif isinstance(pl, dict):
            write_dict(f, pl, level)
        else:
            f.write('// Parsing error!')
        f.write('\n')

if __name__ == '__main__':
    sys.exit(main(sys.argv[1:]))

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20:31:25.268 [plist.parse.failed]: Failed to parse Resources/Config/shipdata.plist as a property list.
Parse failed at line 58 (char 2205) - unexpected character (wanted ';' or '}')

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21:31:38.971 [startup.exception]: ***** Unhandled exception during startup: NSInvalidArgumentException (Tried to add nil value for key 'food' to dictionary).

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...

def write_dict(fs, dct, lvl):
...
    fs.write(lvl*'\t'+'};')    
    # added semi-colon  ^  after closing brace

def write_list(fs, lst, lvl):
...
    fs.write('\n' + lvl*'\t' + ');')    
    # added semi-colon           ^  after closing bracket

...