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__init__.py3.3 KB · 102 lines
"""curses The main package for curses support for Python.  Normally used by importingthe package, and perhaps a particular module inside it.    import curses   from curses import textpad   curses.initscr()   ... """ from _curses import *import os as _osimport sys as _sys # Some constants, most notably the ACS_* ones, are only added to the C# _curses module's dictionary after initscr() is called.  (Some# versions of SGI's curses don't define values for those constants# until initscr() has been called.)  This wrapper function calls the# underlying C initscr(), and then copies the constants from the# _curses module to the curses package's dictionary.  Don't do 'from# curses import *' if you'll be needing the ACS_* constants. def initscr():    import _curses, curses    # we call setupterm() here because it raises an error    # instead of calling exit() in error cases.    setupterm(term=_os.environ.get("TERM", "unknown"),              fd=_sys.__stdout__.fileno())    stdscr = _curses.initscr()    for key, value in _curses.__dict__.items():        if key[0:4] == 'ACS_' or key in ('LINES', 'COLS'):            setattr(curses, key, value)     return stdscr # This is a similar wrapper for start_color(), which adds the COLORS and# COLOR_PAIRS variables which are only available after start_color() is# called. def start_color():    import _curses, curses    retval = _curses.start_color()    if hasattr(_curses, 'COLORS'):        curses.COLORS = _curses.COLORS    if hasattr(_curses, 'COLOR_PAIRS'):        curses.COLOR_PAIRS = _curses.COLOR_PAIRS    return retval # Import Python has_key() implementation if _curses doesn't contain has_key() try:    has_keyexcept NameError:    from .has_key import has_key # Wrapper for the entire curses-based application.  Runs a 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. 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().    """     try:        # Initialize curses        stdscr = initscr()         # Turn off echoing of keys, and enter cbreak mode,        # where no buffering is performed on keyboard input        noecho()        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:            start_color()        except:            pass         return func(stdscr, *args, **kwds)    finally:        # Set everything back to normal        if 'stdscr' in locals():            stdscr.keypad(0)            echo()            nocbreak()            endwin()