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# This file is part of ranger, the console file manager.
# License: GNU GPL version 3, see the file "AUTHORS" for details.
from __future__ import (absolute_import, division, print_function)
import sys
import curses
from ranger.gui.color import get_color
from ranger.core.shared import SettingsAware
REVERSE_ADDCH_ARGS = sys.version[0:5] == '3.4.0'
def _fix_surrogates(args):
return [isinstance(arg, str) and arg.encode('utf-8', 'surrogateescape')
.decode('utf-8', 'replace') or arg for arg in args]
class CursesShortcuts(SettingsAware):
"""This class defines shortcuts to facilitate operations with curses.
color(*keys) -- sets the color associated with the keys from
the current colorscheme.
color_at(y, x, wid, *keys) -- sets the color at the given position
color_reset() -- resets the color to the default
addstr(*args) -- failsafe version of self.win.addstr(*args)
"""
def __init__(self):
self.win = None
def addstr(self, *args):
y, x = self.win.getyx()
try:
self.win.addstr(*args)
except (curses.error, TypeError, ValueError):
# a TypeError changed to ValueError from version 3.5 onwards
# https://bugs.python.org/issue22215
if len(args) > 1:
self.win.move(y, x)
try:
self.win.addstr(*_fix_surrogates(args))
except (curses.error, UnicodeError, ValueError, TypeError):
pass
def addnstr(self, *args):
y, x = self.win.getyx()
try:
self.win.addnstr(*args)
except (curses.error, TypeError, ValueError, TypeError):
if len(args) > 2:
self.win.move(y, x)
try:
self.win.addnstr(*_fix_surrogates(args))
except (curses.error, UnicodeError, ValueError, TypeError):
pass
def addch(self, *args):
if REVERSE_ADDCH_ARGS and len(args) >= 3:
args = [args[1], args[0]] + list(args[2:])
try:
self.win.addch(*args)
except (curses.error, TypeError):
pass
def color(self, *keys):
"""Change the colors from now on."""
attr = self.settings.colorscheme.get_attr(*keys)
try:
self.win.attrset(attr)
except curses.error:
pass
def color_at(self, y, x, wid, *keys):
"""Change the colors at the specified position"""
attr = self.settings.colorscheme.get_attr(*keys)
try:
self.win.chgat(y, x, wid, attr)
except curses.error:
pass
def set_fg_bg_attr(self, fg, bg, attr):
try:
self.win.attrset(curses.color_pair(get_color(fg, bg)) | attr)
except curses.error:
pass
def color_reset(self):
"""Change the colors to the default colors"""
CursesShortcuts.color(self, 'reset')
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