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 atexit.register(print, "Bye")
  20
  21 # available commands
  22 def helpcmd(c):
  23         print("Available commands: %s" % ", ".join(sorted(longcommands.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.send(cmd.encode())
  38                 data = s.recv(4)
  39                 s.close()
  40                 print("...done")
  41                 if data != b'1':
  42                         print("Received unexpected answer %s" % str(data))
  43         return run
  44
  45 def exitcmd(c):
  46         sys.exit(0)
  47
  48 commands = {
  49         'exit': exitcmd,
  50         'help': helpcmd,
  51         'open': sendcmd(tuerSock, 'open'),
  52         'close': sendcmd(tuerSock, 'close'),
  53         'buzz': sendcmd(tuerSock, 'buzz'),
  54 }
  55
  56 # command convenience shortcuts
  57 def filterCommonPrefix (strings, length):
  58         # ignores duplicates in the string list "strings"
  59         toremove=[]
  60         for a in strings:
  61                 for b in strings:
  62                         if a != b:
  63                                 if a[:length] == b[:length]:
  64                                         toremove.append(a)
  65                                         toremove.append(b)
  66         ret = list(strings) # copy
  67         for x in toremove:
  68                 try:
  69                         ret.remove(x)
  70                 except ValueError:
  71                         pass
  72         return ret
  73
  74 def shortcutify (dic):
  75         maxlen = 0
  76         for x in dic.keys():
  77                 if len(x) > maxlen:
  78                         maxlen = len(x)
  79         for i in range(maxlen):
  80                 shortable = filterCommonPrefix (dic.keys(), i)
  81                 for x in shortable:
  82                         dic[x[:i]] = dic[x]
  83         return dic # only for convenience, as dic is passed by reference
  84
  85 longcommands = commands.copy()
  86 shortcutify (commands)
  87
  88
  89 # input loop
  90 print("Welcome to tyshell. Use help to see what you can do.")
  91 while True:
  92         try:
  93                 command = input("$ ")
  94         except EOFError:
  95                 print()
  96                 break
  97         command = shlex.split(command)
  98         if not len(command): continue
  99         # execute command
 100         if command[0] in commands:
 101                 try:
 102                         commands[command[0]](command)
 103                 except Exception as e:
 104                         print("Error while executing %s: %s" % (command[0], str(e)))
 105         else:
 106                 print("Command %s not found. Use help." % command[0])
 107