"""curses.wrapper

Contains one function, wrapper(), which runs another function which

should be the rest of your curses-based application.  If the

application raises an exception, wrapper() will restore the terminal

to a sane state so you can read the resulting traceback.

"""

import curses

def wrapper(func, *args, **kwds):

    """Wrapper function that initializes curses and calls another function,

    restoring normal keyboard/screen behavior on error.

    The callable object 'func' is then passed the main window 'stdscr'

    as its first argument, followed by any other arguments passed to

    wrapper().

    """

    res = None

    try:

        # Initialize curses

        stdscr=curses.initscr()

        # Turn off echoing of keys, and enter cbreak mode,

        # where no buffering is performed on keyboard input

        curses.noecho()

        curses.cbreak()

        # In keypad mode, escape sequences for special keys

        # (like the cursor keys) will be interpreted and

        # a special value like curses.KEY_LEFT will be returned

        stdscr.keypad(1)

        # Start color, too.  Harmless if the terminal doesn't have

        # color; user can test with has_color() later on.  The try/catch

        # works around a minor bit of over-conscientiousness in the curses

        # module -- the error return from C start_color() is ignorable.

        try:

            curses.start_color()

        except:

            pass

        return func(stdscr, *args, **kwds)

    finally:

        # Set everything back to normal

        stdscr.keypad(0)

        curses.echo()

        curses.nocbreak()

        curses.endwin()