import sys
import subprocess
import socket
+import pwd
+import grp
+import traceback
+from collections import namedtuple
tuerSock = "/run/tuer.sock"
pass
import atexit
atexit.register(readline.write_history_file, histfile)
-atexit.register(print, "Bye")
# available commands
def helpcmd(c):
- print("Available commands: %s" % ", ".join(sorted(longcommands.keys())))
+ if (len(c) > 1):
+ print(commands.get(c[1],(None,'Can\'t find help for command %s'%(c[1]))).helpstring)
+ else:
+ print("Available commands: %s" % ", ".join(sorted(commands.keys())))
+ print("Use 'help command' to get more information on the command 'command'")
def extcmd(cmd):
def run(c):
def sendcmd(addr, cmd):
def run(c):
- print("Running %s..." % (cmd))
+ print("206 Sending command %s..." % (cmd))
s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
s.connect(addr)
+ s.settimeout(60.0)
s.send(cmd.encode())
- data = s.recv(4)
+ data = s.recv(256)
s.close()
- print("...done")
- if data != b'1':
- print("Received unexpected answer %s" % str(data))
+ print(data.decode('utf-8'))
return run
def exitcmd(c):
- sys.exit(0)
+ print("Bye")
+ return True
-commands = {
- 'exit': exitcmd,
- 'help': helpcmd,
- 'open': sendcmd(tuerSock, 'open'),
- 'close': sendcmd(tuerSock, 'close'),
- 'buzz': sendcmd(tuerSock, 'buzz'),
-}
+def whocmd(c):
+ for n in grp.getgrnam("tuer").gr_mem:
+ p = pwd.getpwnam(n)
+ print (p.pw_name, " - ", p.pw_gecos)
-# command convenience shortcuts
-def filterCommonPrefix (strings, length):
- # ignores duplicates in the string list "strings"
- toremove=[]
- for a in strings:
- for b in strings:
- if a != b:
- if a[:length] == b[:length]:
- toremove.append(a)
- toremove.append(b)
- ret = list(strings) # copy
- for x in toremove:
- try:
- ret.remove(x)
- except ValueError:
- pass
- return ret
+def alias (cmds, aliases):
+ for newname, oldname in aliases.items():
+ cmds[newname] = cmds[oldname]
+ return cmds
-def shortcutify (dic):
- maxlen = 0
- for x in dic.keys():
- if len(x) > maxlen:
- maxlen = len(x)
- for i in range(maxlen):
- shortable = filterCommonPrefix (dic.keys(), i)
- for x in shortable:
- dic[x[:i]] = dic[x]
- return dic # only for convenience, as dic is passed by reference
+CmdEntry = namedtuple('CmdEntry','function helpstring')
-longcommands = commands.copy()
-shortcutify (commands)
+commands = alias({
+ 'exit': CmdEntry(exitcmd, 'Quits this shell'),
+ 'help': CmdEntry(helpcmd, 'Helps you getting to know the available commands'),
+ 'unlock': CmdEntry(sendcmd(tuerSock, 'unlock'), 'Will try to unlock the apartment door'),
+ 'buzz': CmdEntry(sendcmd(tuerSock, 'buzz'), 'Will buzz the buzzer for the street door'),
+ 'who': CmdEntry(whocmd, 'Shows the list of people, who are allowed to control this system'),
+},{
+ # aliases
+ 'open': 'unlock',
+})
+def complete_command(cmd):
+ '''returns a list of commands (as strings) starting with cmd'''
+ return list(filter(lambda x: x.startswith(cmd), commands.keys()))
+readline.set_completer(lambda cmd, num: (complete_command(cmd)+[None])[num]) # wrap complete_command for readline's weird completer API
+readline.parse_and_bind("tab: complete") # run completion on tab
# input loop
print("Welcome to tyshell. Use help to see what you can do.")
break
command = shlex.split(command)
if not len(command): continue
- # execute command
- if command[0] in commands:
+ # find suiting commands
+ if command[0] in commands: # needed in case a complete command is a prefix of another one
+ cmdoptions = [command[0]]
+ else:
+ cmdoptions = complete_command(command[0])
+ # check how many we found
+ if len(cmdoptions) == 0: # no commands fit prefix
+ print("Command %s not found. Use help." % command[0])
+ elif len(cmdoptions) == 1: # exactly one command fits (prefix)
try:
- commands[command[0]](command)
+ res = commands[cmdoptions[0]].function(command)
+ if res: break
except Exception as e:
print("Error while executing %s: %s" % (command[0], str(e)))
- else:
- print("Command %s not found. Use help." % command[0])
+ #print(traceback.format_exc())
+ else: # multiple commands fit the prefix
+ print("Ambiguous command prefix, please choose one of the following:")
+ print("\t", " ".join(cmdoptions))
+ # TODO: put current "command[0]" into the shell for the next command, but such that it is deletable with backspace