#!/usr/bin/env python

"""
doctest runner for simpypi tests
"""

import doctest
import os
import shutil
import sys
import tempfile
import virtualenv
from optparse import OptionParser

def create_virtualenv(path):
    """create a virtualenv and return the path to the python interpreter therein"""
    virtualenv.create_environment(path)
    for python in (('bin', 'python'), ('Scripts', 'python.exe')):
        python = os.path.join(path, *python)
        if os.path.exists(python):
            return python
    raise Exception("Python binary not found in %s" % path)

def run_tests(raise_on_error=False, report_first=False):

    # add results here
    results = {}

    # doctest arguments
    directory = os.path.dirname(os.path.abspath(__file__))
    extraglobs = {'here': directory, 'create_virtualenv': create_virtualenv}
    doctest_args = dict(extraglobs=extraglobs, raise_on_error=raise_on_error)
    if report_first:
        doctest_args['optionflags'] = doctest.REPORT_ONLY_FIRST_FAILURE

    # gather tests
    tests =  [ test for test in os.listdir(directory)
               if test.endswith('.txt') ]

    # run the tests
    for test in tests:

        # make a temporary directory
        tmpdir = tempfile.mkdtemp()
        doctest_args['extraglobs']['directory'] = tmpdir

        try:
            results[test] = doctest.testfile(test, **doctest_args)
        except doctest.DocTestFailure, failure:
            raise
        except doctest.UnexpectedException, failure:
            raise failure.exc_info[0], failure.exc_info[1], failure.exc_info[2]
        finally:
            if os.path.exists(tmpdir):
                shutil.rmtree(tmpdir)

    return results

def main(args=sys.argv[1:]):

    # parse command line args
    parser = OptionParser(description=__doc__)
    parser.add_option('--raise', dest='raise_on_error',
                      default=False, action='store_true',
                      help="raise on first error")
    parser.add_option('--report-first', dest='report_first',
                      default=False, action='store_true',
                      help="report the first error only (all tests will still run)")
    options, args = parser.parse_args(args)

    # run the tests
    results = run_tests(**options.__dict__)
    if sum([i.failed for i in results.values()]):
        sys.exit(1) # error

if __name__ == '__main__':
    main()