tyshell

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