scripts/misc/iso639

#!/usr/bin/env python
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#     http://www.apache.org/licenses/LICENSE-2.0
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"""
Converts among language names and abbreviations using Python's ISO-639 module.
https://pypi.python.org/pypi/iso-639/0.4.3

You need to install the iso-639 module:

    pip install [--user] iso-639

Here is some example usage of that module:

    > from iso639 import languages as l
    > greek = l.get(part1 = 'el')
    > pprint(vars(greek))
    {'inverted': 'Greek, Modern (1453-)',
     'macro': '',
     'name': 'Modern Greek (1453-)',
     'names': [],
     'part1': 'el',
     'part2b': 'gre',
     'part2t': 'ell',
     'part3': 'ell',
     'part5': ''}
"""

import sys

if len(sys.argv) != 2:
    print "Usage: iso639 LANG"
    print "where LANG is a language name or abbreviation."
    sys.exit(1)

# Common manual mappings in order to avoid the potentially
# not present iso639 module
quickdict = {
   'English': 'en',
   'en': 'English',
   'Spanish': 'es',
   'es': 'Spanish',
   'Hebrew': 'he',
   'he': 'Hebrew',
   'German': 'de',
   'de': 'German',
   'French': 'fr',
   'fr': 'French',
   'Arabic': 'ar',
   'ar': 'Arabic',
   'Czech': 'cs',
   'cs': 'Czech',
   'Romanian': 'ro',
   'ro': 'Romanian',
}

input = sys.argv[1]

if quickdict.has_key(input):
    print quickdict[input]

else:
    # Only load this if we have to

    try:
        import iso639

        if len(input) == 2:
            lang = iso639.languages.get(part1 = input)
            print lang.name
        elif len(input) == 3:
            lang = iso639.languages.get(part3 = input)
            print lang.name
        else:
            lang = iso639.languages.get(name = input)
            print lang.part1

    except ImportError:
        sys.stderr.write('Can\'t load module iso639 ("pip install --user iso-639")\n')

    except KeyError:
        sys.stderr.write('Language not found: {}\n'.format(input))