mirror of
https://github.com/python/cpython.git
synced 2024-11-22 05:26:10 +01:00
6ae254aaa0
Tools such as ruff can ignore "imported but unused" warnings if a line ends with "# noqa: F401". It avoids the temptation to remove an import which is used effectively.
102 lines
3.3 KiB
Python
102 lines
3.3 KiB
Python
"""curses
|
|
|
|
The main package for curses support for Python. Normally used by importing
|
|
the package, and perhaps a particular module inside it.
|
|
|
|
import curses
|
|
from curses import textpad
|
|
curses.initscr()
|
|
...
|
|
|
|
"""
|
|
|
|
from _curses import *
|
|
import os as _os
|
|
import 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_key
|
|
except NameError:
|
|
from .has_key import has_key # noqa: F401
|
|
|
|
# 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()
|