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#!/usr/bin/env python3
# File: logout-manager-ncurses
# License: MIT
# Author: adamlamers, bgstack15
# Startdate: 2020-03-09 17:06
# Title: ncurses based logout manager
# Usage:
# logout-manager-ncurses
# Reference:
# https://docs.python.org/3/howto/curses.html
# ripped straight from http://adamlamers.com/post/FTPD9KNRA8CT
# https://stackoverflow.com/questions/3061/calling-a-function-of-a-module-by-using-its-name-a-string/12025554#12025554
# https://robinislam.me/blog/reading-environment-variables-in-python/
# Improve:
# Dependencies:
# dep-devuan: python3-dotenv
# Documentation:
# Improvements for CursesMenu class over origin:
# accepts number key inputs
# accepts enabled attribute
# add "zeroindex" bool
import curses, os, sys
from distro import linux_distribution
from dotenv import load_dotenv
# all this to load the libpath
try:
defaultdir="/etc/sysconfig"
thisplatform = linux_distribution()[0].lower()
if 'debian' in thisplatform or 'devuan' in thisplatform:
defaultdir="/etc/default"
# load_dotenv keeps existing environment variables as higher precedent
load_dotenv(os.path.join(defaultdir,"logout-manager"))
except:
pass
if 'LOGOUT_MANAGER_LIBPATH' in os.environ:
for i in os.environ['LOGOUT_MANAGER_LIBPATH'].split(":"):
sys.path.append(i)
sys.path.append("/usr/share/logout-manager")
import lmlib
class CursesMenu(object):
INIT = {'type' : 'init'}
def __init__(self, menu_options):
self.screen = curses.initscr()
self.menu_options = menu_options
self.selected_option = 0
self._previously_selected_option = None
self.running = True
self._zero_offset = 1
try:
self._zero_offset = 0 if bool(self.menu_options['zeroindex']) else 1
except:
pass
#init curses and curses input
curses.noecho()
curses.cbreak()
curses.start_color()
curses.curs_set(0) #Hide cursor
self.screen.keypad(1)
#set up color pair for highlighted option
curses.init_pair(1, curses.COLOR_BLACK, curses.COLOR_WHITE)
self.hilite_color = curses.color_pair(1)
self.normal_color = curses.A_NORMAL
def prompt_selection(self, parent=None):
if parent is None:
lastoption = "Cancel"
else:
lastoption = "Return to previous menu ({})".format(parent['title'])
option_count = len(self.menu_options['options'])
input_key = None
ENTER_KEY = ord('\n')
NUM_KEYS = [ord(str(i)) for i in range(self._zero_offset,option_count+1+self._zero_offset)]
done = False
while not done:
if self.selected_option != self._previously_selected_option:
self._previously_selected_option = self.selected_option
self.screen.border(0)
self._draw_title()
for option in range(option_count):
if self.selected_option == option:
self._draw_option(option, self.hilite_color)
else:
self._draw_option(option, self.normal_color)
if self.selected_option == option_count:
self.screen.addstr(4 + option_count, 4, "{:2} - {}".format(option_count+self._zero_offset,
lastoption), self.hilite_color)
else:
self.screen.addstr(4 + option_count, 4, "{:2} - {}".format(option_count+self._zero_offset,
lastoption), self.normal_color)
max_y, max_x = self.screen.getmaxyx()
if input_key is not None:
self.screen.addstr(max_y-3, max_x - 5, "{:3}".format(self.selected_option+self._zero_offset))
self.screen.refresh()
input_key = self.screen.getch()
down_keys = [curses.KEY_DOWN, ord('j')]
up_keys = [curses.KEY_UP, ord('k')]
exit_keys = [ord('q')]
if input_key in down_keys:
if self.selected_option < option_count:
self.selected_option += 1
else:
self.selected_option = 0
if input_key in up_keys:
if self.selected_option > 0:
self.selected_option -= 1
else:
self.selected_option = option_count
if input_key in exit_keys:
self.selected_option = option_count #auto select exit and return
break
if input_key == ENTER_KEY or input_key in NUM_KEYS:
if input_key in NUM_KEYS:
self.selected_option=int(chr(input_key))-self._zero_offset
done = True
try:
done = self.menu_options['options'][self.selected_option]['enabled']
except:
pass
return self.selected_option
def _draw_option(self, option_number, style):
thistext = self.menu_options['options'][option_number]['title']
try:
if self.menu_options['options'][option_number]['enabled'] == False: thistext += " (disabled)"
except:
pass
self.screen.addstr(4 + option_number,
4,
"{:2} - {}".format(option_number+self._zero_offset, thistext),
style)
def _draw_title(self):
self.screen.addstr(2, 2, self.menu_options['title'], curses.A_STANDOUT)
self.screen.addstr(3, 2, self.menu_options['subtitle'], curses.A_BOLD)
def display(self):
selected_option = self.prompt_selection()
i, _ = self.screen.getmaxyx()
curses.endwin()
#os.system('clear')
if selected_option < len(self.menu_options['options']):
selected_opt = self.menu_options['options'][selected_option]
return selected_opt
else:
self.running = False
return {'title' : 'Cancel', 'type' : 'exitmenu'}
# load configs
config = lmlib.Initialize_config(os.environ['LOGOUT_MANAGER_CONF'])
actions = lmlib.Actions
# MAIN LOOP
menu = {
'title' : 'Logout Manager',
'type' : 'menu',
'subtitle' : 'Use arrows or number keys',
'zeroindex' : False,
'options' : [
{'title': 'Lock', 'type': 'action', 'action': 'lock'},
{'title': 'Logout', 'type': 'action', 'action': 'logout'},
{'title': 'Hibernate', 'type': 'action', 'action': 'hibernate', 'enabled': config.can_hibernate},
{'title': 'Shutdown', 'type': 'action', 'action': 'shutdown'},
{'title': 'Reboot', 'type': 'action', 'action': 'reboot'}
]
}
m = CursesMenu(menu)
selected_action = m.display()
if selected_action['type'] == 'exitmenu':
print("Cancel any logout action.")
elif selected_action['type'] == 'command':
os.system(selected_action['command'])
elif selected_action['type'] == 'action':
#a = selected_action['action']:
func = getattr(globals()['actions'],selected_action['action'])
func(config)
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