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"""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 sys, curses
def wrapper(func, *rest):
"""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
res = apply(func, (stdscr,) + rest)
except:
# In the event of an error, restore the terminal
# to a sane state.
stdscr.keypad(0)
curses.echo()
curses.nocbreak()
curses.endwin()
# Pass the exception upwards
(exc_type, exc_value, exc_traceback) = sys.exc_info()
raise exc_type, exc_value, exc_traceback
else:
# Set everything back to normal
stdscr.keypad(0)
curses.echo()
curses.nocbreak()
curses.endwin() # Terminate curses
return res
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