tyshell

   1 #!/usr/bin/python3
   2 import os
   3 import readline
   4 import shlex
   5 import sys
   6 import subprocess
   7 import socket
   8 import pwd
   9
  10 tuerSock = "/run/tuer.sock"
  11
  12 # use a histfile
  13 histfile = os.path.join(os.path.expanduser("~"), ".tyshellhist")
  14 try:
  15     readline.read_history_file(histfile)
  16 except IOError:
  17     pass
  18 import atexit
  19 atexit.register(readline.write_history_file, histfile)
  20
  21 # available commands
  22 def helpcmd(c):
  23         print("Available commands: %s" % ", ".join(sorted(commands.keys())))
  24
  25 def extcmd(cmd):
  26         def run(c):
  27                 ret = subprocess.call(cmd)
  28                 if ret != 0:
  29                         print("Command returned non-zero exit statis %d" % ret)
  30         return run
  31
  32 def sendcmd(addr, cmd):
  33         def run(c):
  34                 print("Running %s..." % (cmd))
  35                 s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
  36                 s.connect(addr)
  37                 s.settimeout(10.0)
  38                 s.send(cmd.encode())
  39                 data = s.recv(4)
  40                 s.close()
  41                 print(data.decode('utf-8'))
  42         return run
  43
  44 def exitcmd(c):
  45         print("Bye")
  46         return True
  47
  48 def whocmd(c):
  49         for p in filter(lambda x:x.pw_shell=="/opt/tuer/tyshell",pwd.getpwall()):
  50                 print (p.pw_name, " - ", p.pw_gecos)
  51
  52 commands = {
  53         'exit': exitcmd,
  54         'help': helpcmd,
  55         'open': sendcmd(tuerSock, 'unlock'),
  56         'unlock': sendcmd(tuerSock, 'unlock'),
  57         'buzz': sendcmd(tuerSock, 'buzz'),
  58         'who': whocmd,
  59 }
  60
  61 def complete_command(cmd):
  62         '''returns a list of commands (as strings) starting with cmd'''
  63         return list(filter(lambda x: x.startswith(cmd), commands.keys()))
  64 readline.set_completer(lambda cmd, num: (complete_command(cmd)+[None])[num]) # wrap complete_command for readline's weird completer API
  65 readline.parse_and_bind("tab: complete") # run completion on tab
  66
  67 # input loop
  68 print("Welcome to tyshell. Use help to see what you can do.")
  69 while True:
  70         try:
  71                 command = input("$ ")
  72         except EOFError:
  73                 print()
  74                 break
  75         command = shlex.split(command)
  76         if not len(command): continue
  77         # find suiting commands
  78         if command[0] in commands: # needed in case a complete command is a prefix of another one
  79                 cmdoptions = [command[0]]
  80         else:
  81                 cmdoptions = complete_command(command[0])
  82         # check how many we found
  83         if len(cmdoptions) == 0: # no commands fit prefix
  84                 print("Command %s not found. Use help." % command[0])
  85         elif len(cmdoptions) == 1: # exactly one command fits (prefix)
  86                 try:
  87                         res = commands[cmdoptions[0]](command)
  88                         if res: break
  89                 except Exception as e:
  90                         print("Error while executing %s: %s" % (command[0], str(e)))
  91         else: # multiple commands fit the prefix
  92                 print("Ambiguous command prefix, please choose one of the following:")
  93                 print("\t", " ".join(cmdoptions))
  94                 # TODO: put current "command[0]" into the shell for the next command, but such that it is deletable with backspace
  95