import filetensor
import nnet_ops

from lookup_list import LookupList



import subprocess as _subprocess
import imp as _imp
def __src_version__():
    """Return compact identifier of module code.

    @return: compact identifier of module code.
    @rtype: string

    @note: This function tries to establish that the source files and the repo
    are syncronized.  It raises an Exception if there are un-tracked '.py'
    files, or if there are un-committed modifications.  This implementation uses
    "hg id" to establish this.  The code returned by "hg id" is not affected by
    hg pull, but pulling might remove the " tip" string which might have
    appeared.  This implementation ignores the  " tip" information, and only
    uses the code.

    @note: This implementation is assumes that the import directory is under
    version control by mercurial.

    """
    #print 'name:', __name__
    location = _imp.find_module(__name__)[1]
    #print 'location:', location

    status = _subprocess.Popen(('hg','st'),cwd=location,stdout=_subprocess.PIPE).communicate()[0]
    #status_codes = [line[0] for line in  if line and line[0] != '?']
    for line in status.split('\n'):
        if not line: continue
        if line[0] != '?':
            raise Exception('Uncommitted modification to "%s" in %s (%s)'
                    %(line[2:], __name__,location))
        if line[0] == '?' and line[-3:] == '.py':
            raise Exception('Untracked file "%s" in %s (%s)'
                    %(line[2:], __name__, location))

    hg_id = _subprocess.Popen(('hg','id'),cwd=location,stdout=_subprocess.PIPE).communicate()[0]

    #This asserts my understanding of hg id return values
    # There is mention in the doc that it might return two parent hash codes
    # but I've never seen it, and I dont' know what it means or how it is
    # formatted.
    tokens = hg_id.split(' ')
    assert len(tokens) <= 2
    assert len(tokens) >= 1
    assert tokens[0][-1] != '+' # the trailing + indicates uncommitted changes
    if len(tokens) == 2:
        assert tokens[1] == 'tip\n'

    return tokens[0]