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from ranger.shared import SettingsAware
import _curses
class CursesShortcuts(SettingsAware):
"""
This class defines shortcuts to faciliate 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 addstr(self, *args):
try:
self.win.addstr(*args)
except (_curses.error, TypeError):
pass
def addnstr(self, *args):
try:
self.win.addnstr(*args)
except (_curses.error, TypeError):
pass
def color(self, keylist = None, *keys):
"""Change the colors from now on."""
keys = combine(keylist, keys)
attr = self.settings.colorscheme.get_attr(*keys)
try:
self.win.attrset(attr)
except _curses.error:
pass
def color_at(self, y, x, wid, keylist = None, *keys):
"""Change the colors at the specified position"""
keys = combine(keylist, keys)
attr = self.settings.colorscheme.get_attr(*keys)
try:
self.win.chgat(y, x, wid, attr)
except _curses.error:
pass
def color_reset(self):
"""Change the colors to the default colors"""
CursesShortcuts.color(self, 'reset')
def combine(seq, tup):
"""Add seq and tup. Ensures that the result is a tuple."""
try:
if isinstance(seq, str): raise TypeError
return tuple(tuple(seq) + tup)
except TypeError:
try:
return tuple((seq, ) + tup)
except:
return ()
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