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"""Command line user interface."""
import cmd
import re
import threading
from authority_string_transformer import AuthorityStringTransformer
from authority_string_transformer import AuthorityStringTransformerError
from users_text_manager import UNKNOWN
from users_text_manager import UsersTextManagerError
INTRO = ''
PROMPT = '> '
class CmdUI(cmd.Cmd): # pylint: disable=R0904
"""Command line user interface.
Attributes:
_users_text_manager: An instance of UsersTextManager.
_tcp_server: An instance of TcpServer.
_shared_vim_server: An instance of SharedVimServer.
_exit_flag: Whether this UI should stop or not.
_thread: Instance of Thread.
"""
def __init__(self, users_text_manager, tcp_server, shared_vim_server):
"""Constructor.
Args:
users_text_manager: An instance of UsersTextManager.
shared_vim_server: An instance of SharedVimServer.
"""
super(CmdUI, self).__init__(INTRO)
self.prompt = PROMPT
self._users_text_manager = users_text_manager
self._tcp_server = tcp_server
self._shared_vim_server = shared_vim_server
self._stop_flag = False
self._thread = None
def do_add(self, text):
"""Adds a user, [usage] add <identity> <nickname> <authority>"""
try:
identity, nickname, authority_str = _split_text(text, 3)
authority = AuthorityStringTransformer.to_number(authority_str)
self._users_text_manager.add_user(identity, nickname, authority)
self.write('Done\n')
except _SplitTextError:
self.write('Format error!\n' +
'[usage] add <identity> <nickname> <authority>\n')
except AuthorityStringTransformerError as e:
self.write('Fail: %r\n' % e)
except UsersTextManagerError as e:
self.write('Fail: %r\n' % e)
def do_delete(self, text):
"""Deletes a user, [usage] delete <identity>"""
try:
identity = _split_text(text, 1)[0]
self._users_text_manager.delete_user(identity)
self.write('Done\n')
except _SplitTextError:
self.write('Format error!\n' +
'[usage] delete <identity>\n')
except UsersTextManagerError as e:
self.write('Fail: %r\n' % e)
def do_deleteall(self, text):
"""Deletes all users, [usage] deleteall"""
try:
_split_text(text, 0)
for identity in self._users_text_manager.get_users_info().keys():
self._users_text_manager.delete_user(identity)
self.write('Done\n')
except _SplitTextError:
self.write('Format error!\n' +
'[usage] deleteall\n')
except UsersTextManagerError as e:
self.write('Fail: %r\n' % e)
def do_reset(self, text):
"""Resets a user, [usage] reset <identity>"""
try:
iden = _split_text(text, 1)[0]
if iden not in self._users_text_manager.get_users_info():
self.write('Fail: Identity %r not found\n' % iden)
else:
self._users_text_manager.reset_user(iden)
self.write('Done\n')
except _SplitTextError:
self.write('Format error!\n' +
'[usage] reset <identity>\n')
except UsersTextManagerError as e:
self.write('Fail: %r\n' % e)
def do_list(self, text):
"""Lists users, [usage] list"""
try:
_split_text(text, 0)
for iden, user in self._users_text_manager.get_users_info().items():
self.write('%r => %s' % (iden, user))
except _SplitTextError:
self.write('Format error!\n' +
'[usage] list\n')
except UsersTextManagerError as e:
self.write('Fail: %r\n' % e)
def do_online(self, text):
"""Lists online users, [usage] online"""
try:
_split_text(text, 0)
for iden, user in self._users_text_manager.get_users_info().items():
if user.mode == UNKNOWN:
continue
self.write('%r => %s' % (iden, user))
except _SplitTextError:
self.write('Format error!\n' +
'[usage] online\n')
except UsersTextManagerError as e:
self.write('Fail: %r\n' % e)
def do_load(self, text):
"""Loads users from a file, [usage] load <filename>"""
try:
filename = _split_text(text, 1)[0]
with open(filename, 'r') as f:
while True:
line = f.readline()
if line.endswith('\n'):
line = line[:-1]
if not line:
break
try:
iden, nick, auth_str = _split_text(line, 3)
auth = AuthorityStringTransformer.to_number(auth_str)
self._users_text_manager.add_user(iden, nick, auth)
self.write('Done %s %s %s' % (iden, nick, auth))
except _SplitTextError:
self.write('Error format in the file.')
except AuthorityStringTransformerError as e:
self.write('Fail: %r\n' % e)
except UsersTextManagerError as e:
self.write('Fail: %r\n' % e)
self.write('Done')
except _SplitTextError:
self.write('Format error!\n' +
'[usage] load <filename>\n')
except IOError as e:
self.write('Cannot open file? %s' % str(e))
def do_save(self, text):
"""Saves users list to file, [usage] save <filename>"""
try:
filename = _split_text(text, 1)[0]
with open(filename, 'w') as f:
users_info = self._users_text_manager.get_users_info()
for iden, user in users_info.items():
auth = AuthorityStringTransformer.to_string(user.authority)
f.write('%s %s %s\n' % (iden, user.nick_name, auth))
except _SplitTextError:
self.write('Format error!\n' +
'[usage] save <filename>\n')
except IOError as e:
self.write('Cannot open file? %s' % str(e))
def do_port(self, text):
"""Print the server's port."""
_split_text(text, 0)
self.write('server port = %r' % self._tcp_server.port)
def do_exit(self, text):
"""Exits the program."""
self._shared_vim_server.stop()
def do_echo(self, text): # pylint: disable=R0201
"""Echo."""
print(text)
def do_help(self, text):
"""Prints the help document, [usage] help"""
commands = ['add', 'delete', 'list', 'load', 'save', 'exit', 'echo',
'help']
self.write('commands: \n' + ' '.join(commands))
def do_EOF(self, text): # pylint: disable=C0103
"""Same as exit"""
self.do_exit(text)
def emptyline(self):
"""Do nothing."""
pass
def postcmd(self, unused_stop, unused_text):
"""Checks whether it should be stop or not."""
return self._stop_flag
def write(self, text):
"""Writes text by this UI.
It will call the "do_echo" command.
Args:
text: String to be printed.
"""
self.onecmd('echo ' + text)
def start(self, init_cmds=None):
"""Starts this CmdUI.
Args:
init_cmds: Lists of commands to run after startup.
"""
def run_cmdloop(cmd_ui):
"""Calls the method cmdloop()
Args:
cmd_ui: An instnace of CmdUI.
"""
cmd_ui.cmdloop()
self._thread = threading.Thread(target=run_cmdloop, args=(self,))
self._thread.start()
for c in init_cmds if init_cmds else []:
self.onecmd(c)
def stop(self):
"""Stops the command line UI."""
self._stop_flag = True
self.onecmd('echo bye~\n')
def join(self):
"""Joins this thread."""
self._thread.join()
def flush(self):
"""Flush the screen."""
pass
class _SplitTextError(Exception):
"""Error raised by the function _split_text()."""
pass
def _split_text(text, num):
"""Split the text into tuple.
Args:
text: The string to be splitted.
num: Length of the tuple.
Return:
A num-tuple.
"""
words = [word for word in re.split(r'[ \t]', text) if word]
if len(words) != num:
raise _SplitTextError()
return tuple(words)
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