#
# This is a stub module that imports the real 'readline.so' under the
# hood, unless sys.stdout is not a tty, in which case stub functions
# are installed and 'readline.so' is not imported at all.  This is
# a workaround for issues caused by 'import readline' writing a few
# control characters to stdout even if it is not a tty -- at least
# this occurs in some configurations.
#

import os, sys

__all__ = ['add_history',
           'clear_history',
           'get_begidx',
           'get_completer',
           'get_completer_delims',
           'get_current_history_length',
           'get_endidx',
           'get_history_item',
           'get_history_length',
           'get_line_buffer',
           'insert_text',
           'parse_and_bind',
           'read_history_file',
           'read_init_file',
           'redisplay',
           'remove_history_item',
           'replace_history_item',
           'set_completer',
           'set_completer_delims',
           'set_history_length',
           'set_pre_input_hook',
           'set_startup_hook',
           'write_history_file']

if os.isatty(1):
    #sofile = (sys.exec_prefix +
    #    '/lib/python%d.%d/lib-dynload/readline.so' % sys.version_info[:2])
    for _path in sys.path:
        sofile = os.path.join(_path, 'readline.so')
        if os.path.exists(sofile):
            import imp
            _mod = imp.load_module('readline', None, sofile, ('.so', 'rb', imp.C_EXTENSION))
            break
    else:
        # cannot locate the original readline.so!
        # Maybe running on top of pypy.  Let's use pypy/lib/pyrepl/readline.
        from pypy.lib.pyrepl import readline as _mod
    globals().update(_mod.__dict__)
else:
    def _readline_stub(*args, **kwds):
        pass
    for _name in __all__:
        globals()[_name] = _readline_stub