def __init__(self, new_base_commands, options):
"""Constructor
new_base_commands Additions to the base commands
options[in] Options for the class member variables
"""
self.options = options
self.tab_count = 0
self.base_commands = []
self.base_commands.extend(new_base_commands)
self.base_commands.extend(_BASE_COMMANDS)
self.type_complete_mode = _COMMAND_COMPLETE
self.cmd_line = _Command(self.options.get('prompt', '> '))
self.width = self.options.get('width', 80)
self.commands = self.options.get("commands", None)
self.custom_commands = self.options.get("custom", False)
self.quiet = self.options.get("quiet", False)
self.variables = Variables(options)
self.history = _CommandHistory({'max_size' : 20})
var_list = self.options.get('variables', [])
for var in var_list:
self.variables.add_variable(var['name'], var['value'])
class Console(object):
"""Console class
"""
def __init__(self, new_base_commands, options):
"""Constructor
new_base_commands Additions to the base commands
options[in] Options for the class member variables
"""
self.options = options
self.tab_count = 0
self.base_commands = []
self.base_commands.extend(new_base_commands)
self.base_commands.extend(_BASE_COMMANDS)
self.type_complete_mode = _COMMAND_COMPLETE
self.cmd_line = _Command(self.options.get('prompt', '> '))
self.width = self.options.get('width', 80)
self.commands = self.options.get("commands", None)
self.custom_commands = self.options.get("custom", False)
self.quiet = self.options.get("quiet", False)
self.variables = Variables(options)
self.history = _CommandHistory({'max_size': 20})
self.position = 0
self.errors = []
var_list = self.options.get('variables', [])
for var in var_list:
self.variables.add_variable(var['name'], var['value'])
def show_errors(self):
"""Show errors
Displays the errors captured when executing an utility.
"""
if self.quiet:
return
if not self.errors:
print
print("No errors to display.\n")
for error in self.errors:
print
print("{0}\n".format(error))
def clear_errors(self):
"""Clear errors
Clears captured errors occurring while executing an utility.
"""
if self.quiet:
return
self.errors = []
print
def show_last_error(self):
"""Show errors
Displays the last error occurred when executing an utility.
"""
if self.quiet:
return
if not self.errors:
print
print("No error to display.\n")
else:
print
print("{0}\n".format(self.errors[-1]))
def show_custom_command_help(self, arg):
"""Display the help for a custom command.
Note: Override this method for help on custom commands.
arg[in] Help command argument
"""
if self.quiet:
return
print "\nNo commands like '%s' exist.\n" % arg
def do_custom_tab(self, prefix):
"""Do custom tab key processing
Note: Override this method for tab completion for custom commands.
prefix[in] Prefix of the custom command
"""
pass
def do_custom_option_tab(self, prefix):
"""Do custom command option tab key processing
Note: Override this method for tab completion for options for custom
commands.
prefix[in] Prefix of the custom command
"""
if self.quiet:
return
print "\n\nNo custom commands found.\n"
@staticmethod
def is_valid_custom_command(command_text):
"""Is command a valid custom command?
This method evaluates the custom command for validity.
Note: Override this command to determine if command_text is a valid
custom command.
command_text[in] The complete command as entered by user
Returns bool - True if valid, False if not recognized
"""
return False # return False by default if method not overridden
def execute_custom_command(self, command, parameters):
"""Execute a custom command.
Note: Override this method to execute a custom command.
"""
pass
def show_custom_options(self):
"""Show custom options
Note: Override this for 'show options' functionality.
"""
if self.quiet:
return
def do_option_tab(self, prefix):
"""Do tab completion for options
This method will search for an option using the prefix passed. It
first searches the console commands defined at instantiation (the
general commands for the shell) and if not found, checks the
options for a custom command.
prefix[in] Prefix of the option
"""
full_command = self.cmd_line.get_command()
matches = self.get_commands(full_command.strip(' '))
if len(matches) > 0:
self.do_base_command_tab(full_command, matches)
elif self.custom_commands:
# if prefix is 'help', try command complete for custom commands
if full_command[0:4].lower() == 'help':
self.do_custom_tab(prefix)
else:
self.do_custom_option_tab(prefix)
def _set_complete_mode(self):
"""Set the tab completion mode
If the command buffer is only 1 part (command and no options),
we are in _COMMAND_COMPLETE mode.
Else if the nearest option contains a $ at the start, we are in
_VARIABLE_COMPLETE mode.
Else we are in _OPTION_COMPLETE mode.
_COMMAND_COMPLETE = tab complete for base and custom commands
_VARIABLE_COMPLETE = tab complete for user-defined variables
_OPTION_COMPLETE = tab complete for base or custom command options
"""
buf = self.cmd_line.get_command()
parts = buf.split(' ')
segment = ''
if (len(buf) > 0 and len(parts) == 1):
self.type_complete_mode = _COMMAND_COMPLETE
else:
segment = self.cmd_line.get_nearest_option()
if segment.find('$') > 0:
self.type_complete_mode = _VARIABLE_COMPLETE
else:
self.type_complete_mode = _OPTION_COMPLETE
return segment
def show_help(self, parameter):
"""Display the help for either all commands or the help for a
custom command.
parameter[in] Any parameter for the help command.
For example, 'help commands'
"""
if self.quiet:
return
if not parameter or (parameter and parameter.lower() == 'commands'):
print
print_dictionary_list(['Command', 'Description'],
['name', 'text', 'alias'],
self.base_commands, self.width, True)
print
else:
matches = self.get_commands(parameter)
if len(matches) > 0:
self.show_command_help(matches)
elif self.custom_commands:
self.show_custom_command_help(parameter)
def do_variable_tab(self, segment):
"""Do the tab completion for a variable
This method will attempt to find a variable in the list of user-
defined variables and complete the name of variable. If the user
types 'TAB' twice, it will display a list of all possible matches.
"""
# find the last $
variable = ''
start_var = 0
new_var = ''
stop = len(segment)
for i in range(stop - 1, 0, -1):
if segment[i] == ' ':
break
elif segment[i] == '$':
variable = segment[i + 1:]
start_var = i
if start_var == stop:
# show all of the variables
matches = self.variables.get_matches({})
else:
matches = self.variables.get_matches(variable)
if self.tab_count == 2:
if len(matches) > 0:
self.variables.show_variables(matches)
else:
self.variables.show_variables({})
self.cmd_line.display_command()
self.tab_count = 0
else:
# Do command completion here
if len(matches) == 1:
new_var = matches[0].items()[0][0] + ' '
self.cmd_line.add(new_var[len(variable):])
self.tab_count = 0
def do_command_tab(self, command_text):
"""Do the tab completion for a command
If the command is in the base commands, complete it there. If not,
attempt to perform tab completion for custom commands (if defined).
"""
# See if command is in the base command list first
matches = self.get_commands(command_text)
if len(matches) > 0:
self.do_base_command_tab(command_text, matches)
# Ok, not in command list, now check custom commands
elif self.custom_commands:
self.do_custom_tab(command_text)
def do_base_command_tab(self, command_text, matches):
"""Do the tab completion for a base command.
This method prints the list of base commands that match the
command. If the user pressed TAB twice, it displays the list of all
matches. If a single match is found, it returns the balance of the
command.
Note: this method gets its matches from do_command_tab.
command_text[in] Command
matches[in] Known matches (from do_command_tab)
"""
if self.tab_count == 2:
print "\n"
print_dictionary_list(['Command', 'Description'],
['name', 'text', 'alias'], matches,
self.width, True)
print
self.cmd_line.display_command()
self.tab_count = 0
else:
if len(matches) == 1:
if matches[0]['name'][:len(command_text)] == command_text:
new_cmd = matches[0]['name'] + ' '
else:
new_cmd = matches[0]['alias'] + ' '
self.tab_count = 0
self.cmd_line.add(new_cmd[len(command_text):])
def get_commands(self, cmd_prefix):
"""Get list of commands that match a prefix
cmd_prefix[in] prefix for name of command
Returns dictionary entry for command based on matching first n chars
"""
matches = []
stop = len(cmd_prefix)
start = 0
for cmd in self.base_commands:
if cmd['name'][start:stop] == cmd_prefix or \
cmd['alias'][start:stop] == cmd_prefix:
matches.append(cmd)
return matches
def show_command_help(self, commands):
"""Show the help for a list of commands.
commands[in] List of commands
"""
if self.quiet:
return
print
print_dictionary_list(['Command', 'Description'],
['name', 'text', 'alias'], commands, self.width,
True)
print
def _do_command(self, command):
"""Execute a command
This method routes the command to the appropriate methods for
execution.
command[in] Command to execute
Returns bool True - exit utility, False - do not exit
"""
# do variable replacement
command = self._replace_variables(command.strip(' '))
if self.options.get('verbosity', False):
print "\nExecuting command:", command
# process simple commands
if command.lower().startswith('set '):
self._add_variable(command[4:])
if not self.quiet:
print
elif command[0:11].lower() == 'show errors':
self.show_errors()
elif command[0:12].lower() == 'clear errors':
self.clear_errors()
elif command[0:15].lower() == 'show last error':
self.show_last_error()
elif command[0:14].lower() == 'show variables':
self.variables.show_variables()
elif self.custom_commands and command[0:12].lower() == 'show options':
self.show_custom_options()
else:
cmd, parameters = self._get_util_parameters(command)
if cmd is None:
return False
else:
if cmd.lower() == 'help':
token = parameters[0] if parameters else ''
self.show_help(token)
self.cmd_line.clear()
self.tab_count = 0
elif cmd == '':
print
elif cmd.lower() in ['exit', 'quit']:
print
return True
elif self.custom_commands:
if not self.is_valid_custom_command(cmd):
print("\n\nUnknown command: {0} {1}\n"
"".format(cmd, ' '.join(parameters)))
else:
try:
self.execute_custom_command(cmd, parameters)
print
except UtilError as err:
print err.errmsg
self.cmd_line.clear()
self.tab_count = 0
return False
def _process_command_keys(self, cmd_key):
"""Do the action associated with a command key.
This method will act on the recognized command keys and execute the
effect for each.
cmd_key[in] Key pressed
"""
if cmd_key in ['ESCAPE']:
self.cmd_line.erase_command()
elif cmd_key in ['DELETE_POSIX', 'DELETE_WIN', 'DELETE_MAC']:
self.cmd_line.delete_keypress()
self.tab_count = 0
elif cmd_key == 'ARROW_UP':
self.cmd_line.replace_command(self.history.previous())
elif cmd_key == 'ARROW_DN':
self.cmd_line.replace_command(self.history.next())
elif cmd_key == 'ARROW_LT':
self.cmd_line.left_arrow_keypress()
elif cmd_key == 'ARROW_RT':
self.cmd_line.right_arrow_keypress()
elif cmd_key in ['BACKSPACE_POSIX', 'BACKSPACE_WIN']:
self.cmd_line.backspace_keypress()
elif cmd_key == 'HOME':
self.cmd_line.home_keypress()
elif cmd_key == 'END':
self.cmd_line.end_keypress()
else: # 'TAB'
segment = self._set_complete_mode()
self.tab_count += 1
if self.type_complete_mode == _COMMAND_COMPLETE:
self.do_command_tab(self.cmd_line.get_command())
elif self.type_complete_mode == _OPTION_COMPLETE:
self.do_option_tab(segment)
else: # _VARIABLE_COMPLETE
self.do_variable_tab(segment)
cmd_key = ''
def _add_variable(self, set_command):
"""Add a variable to the list of variables.
This method adds the user-defined variable to the internal list.
set_command[in] Set command from the user
"""
if set_command.find('=') <= 0:
print "\n\nSET command invalid. Syntax: SET <NAME> = <value>"
return
# get name and value
name, value = set_command.split('=')
name = name.strip().strip('$')
value = value.strip()
self.variables.add_variable(name, value)
def _replace_variables(self, cmd_string):
"""Replace user-defined variables with values from the internal list.
This method replaces $VARNAME with the value stored when the set
command was issued.
cmd_string[in] Command from the user
Returns string - command string with replacements
"""
i = 1
new_cmd = cmd_string
while i > 0:
i = new_cmd.find('$', i)
if i > 0:
j = new_cmd.find(' ', i)
if j == -1:
j = len(new_cmd)
if j > i:
var_name = new_cmd[i + 1:j]
var = self.variables.find_variable(var_name)
if var is not None:
new_cmd = new_cmd[0:i] + var[var_name] + new_cmd[j:]
else:
i = j
return new_cmd
@staticmethod
def _get_util_parameters(cmd_string):
"""Split the command name from the command and return balance as
parameters.
cmd_string[in] Command
Returns tuple - command, list of parameters
"""
try:
tokens = shlex.split(cmd_string)
except ValueError as err:
print
print("WARNING: Unable to execute command, reason: {0}"
"".format(str(err)))
return None, None
else:
if len(tokens) > 1:
return tokens[0], tokens[1:]
return cmd_string.strip(' '), []
def get_user_command(self):
"""Get a command from the user.
This method displays a prompt to the user and returns when one of
the command keys is pressed.
"""
self.cmd_line.display_command()
cmd_string = ''
cmd_key = None
self.tab_count = 0
while cmd_key not in ['ENTER_POSIX', 'ENTER_WIN']:
key = getch()
# If a special key, act on it
if key in _COMMAND_KEY:
cmd_key = _COMMAND_KEY[key]
# Windows does things oddly for some keys
if not os.name == 'posix' and cmd_key == 'SPECIAL_WIN':
key = getch()
cmd_key = _WIN_COMMAND_KEY.get(key)
if cmd_key is None:
continue
self._process_command_keys(cmd_key)
cmd_string = self.cmd_line.get_command()
# else add key to command buffer
else:
cmd_string = self.cmd_line.get_command()
self.cmd_line.add(key)
cmd_string = self.cmd_line.get_command()
sys.stdout.flush()
self.position = 0
return cmd_string
def run_console(self, lines=None):
"""Run the console.
This method is the main loop for executing commands. For all subclassed
classes, the user need only call this method to execute an interactive
shell or execute commands and exit. It can be used in three modes:
1) it can process commands passed via lines list
2) it can process commands passed via a pipe to the python exec
3) it can prompt for commands and execute them as entered
Modes (1) and (2) execute all commands then exit.
lines[in] If not empty, execute the list of commands.
"""
if not lines:
lines = []
# If we have commands issued by the command line, execute and exit.
if self.commands is not None:
command_list = self.commands.split(';')
for command in command_list:
command = command.strip('\n').strip(' ')
if os.name == 'nt':
command = command.strip('"')
if self._do_command(command.strip('"')):
break
# If we have piped input, read the input by line and execute
elif not os.isatty(sys.stdin.fileno()) or len(lines) > 0:
for command in sys.stdin.readlines():
command_list = command.split(';')
for cmd in command_list:
cmd = cmd.strip('\n').strip(' ')
if os.name == 'nt':
cmd = cmd.strip('"')
if self._do_command(cmd.strip('"')):
break
# Otherwise, we are in an interactive mode where we get a command
# from the user and execute
else:
cmd = ''
if not self.quiet:
print self.options.get('welcome', 'Welcome to the console!\n')
while cmd.lower() not in ['exit', 'quit']:
command = self.get_user_command()
self.history.add(command)
if self._do_command(command):
break
if not self.quiet:
print self.options.get('goodbye',
'Thanks for using the console.\n')
class Console(object):
"""Console class
"""
def __init__(self, new_base_commands, options):
"""Constructor
new_base_commands Additions to the base commands
options[in] Options for the class member variables
"""
self.options = options
self.tab_count = 0
self.base_commands = []
self.base_commands.extend(new_base_commands)
self.base_commands.extend(_BASE_COMMANDS)
self.type_complete_mode = _COMMAND_COMPLETE
self.cmd_line = _Command(self.options.get('prompt', '> '))
self.width = self.options.get('width', 80)
self.commands = self.options.get("commands", None)
self.custom_commands = self.options.get("custom", False)
self.quiet = self.options.get("quiet", False)
self.variables = Variables(options)
self.history = _CommandHistory({'max_size': 20})
self.position = 0
self.errors = []
var_list = self.options.get('variables', [])
for var in var_list:
self.variables.add_variable(var['name'], var['value'])
def show_errors(self):
"""Show errors
Displays the errors captured when executing an utility.
"""
if self.quiet:
return
if not self.errors:
print
print("No errors to display.\n")
for error in self.errors:
print
print("{0}\n".format(error))
def clear_errors(self):
"""Clear errors
Clears captured errors occurring while executing an utility.
"""
if self.quiet:
return
self.errors = []
print
def show_last_error(self):
"""Show errors
Displays the last error occurred when executing an utility.
"""
if self.quiet:
return
if not self.errors:
print
print("No error to display.\n")
else:
print
print("{0}\n".format(self.errors[-1]))
def show_custom_command_help(self, arg):
"""Display the help for a custom command.
Note: Override this method for help on custom commands.
arg[in] Help command argument
"""
if self.quiet:
return
print "\nNo commands like '%s' exist.\n" % arg
def do_custom_tab(self, prefix):
"""Do custom tab key processing
Note: Override this method for tab completion for custom commands.
prefix[in] Prefix of the custom command
"""
pass
def do_custom_option_tab(self, prefix):
"""Do custom command option tab key processing
Note: Override this method for tab completion for options for custom
commands.
prefix[in] Prefix of the custom command
"""
if self.quiet:
return
print "\n\nNo custom commands found.\n"
@staticmethod
def is_valid_custom_command(command_text):
"""Is command a valid custom command?
This method evaluates the custom command for validity.
Note: Override this command to determine if command_text is a valid
custom command.
command_text[in] The complete command as entered by user
Returns bool - True if valid, False if not recognized
"""
return False # return False by default if method not overridden
def execute_custom_command(self, command, parameters):
"""Execute a custom command.
Note: Override this method to execute a custom command.
"""
pass
def show_custom_options(self):
"""Show custom options
Note: Override this for 'show options' functionality.
"""
if self.quiet:
return
def do_option_tab(self, prefix):
"""Do tab completion for options
This method will search for an option using the prefix passed. It
first searches the console commands defined at instantiation (the
general commands for the shell) and if not found, checks the
options for a custom command.
prefix[in] Prefix of the option
"""
full_command = self.cmd_line.get_command()
matches = self.get_commands(full_command.strip(' '))
if len(matches) > 0:
self.do_base_command_tab(full_command, matches)
elif self.custom_commands:
# if prefix is 'help', try command complete for custom commands
if full_command[0:4].lower() == 'help':
self.do_custom_tab(prefix)
else:
self.do_custom_option_tab(prefix)
def _set_complete_mode(self):
"""Set the tab completion mode
If the command buffer is only 1 part (command and no options),
we are in _COMMAND_COMPLETE mode.
Else if the nearest option contains a $ at the start, we are in
_VARIABLE_COMPLETE mode.
Else we are in _OPTION_COMPLETE mode.
_COMMAND_COMPLETE = tab complete for base and custom commands
_VARIABLE_COMPLETE = tab complete for user-defined variables
_OPTION_COMPLETE = tab complete for base or custom command options
"""
buf = self.cmd_line.get_command()
parts = buf.split(' ')
segment = ''
if (len(buf) > 0 and len(parts) == 1):
self.type_complete_mode = _COMMAND_COMPLETE
else:
segment = self.cmd_line.get_nearest_option()
if segment.find('$') > 0:
self.type_complete_mode = _VARIABLE_COMPLETE
else:
self.type_complete_mode = _OPTION_COMPLETE
return segment
def show_help(self, parameter):
"""Display the help for either all commands or the help for a
custom command.
parameter[in] Any parameters for the help command.
For example, 'help commands'
"""
if self.quiet:
return
if not parameter or (parameter and parameter.lower() == 'commands'):
print
print_dictionary_list(['Command', 'Description'],
['name', 'text', 'alias'],
self.base_commands, self.width, True)
print
else:
matches = self.get_commands(parameter)
if len(matches) > 0:
self.show_command_help(matches)
elif self.custom_commands:
self.show_custom_command_help(parameter)
def do_variable_tab(self, segment):
"""Do the tab completion for a variable
This method will attempt to find a variable in the list of user-
defined variables and complete the name of variable. If the user
types 'TAB' twice, it will display a list of all possible matches.
"""
#find the last $
variable = ''
start_var = 0
new_var = ''
stop = len(segment)
for i in range(stop - 1, 0, -1):
if segment[i] == ' ':
break
elif segment[i] == '$':
variable = segment[i + 1:]
start_var = i
if start_var == stop:
# show all of the variables
matches = self.variables.get_matches({})
else:
matches = self.variables.get_matches(variable)
if self.tab_count == 2:
if len(matches) > 0:
self.variables.show_variables(matches)
else:
self.variables.show_variables({})
self.cmd_line.display_command()
self.tab_count = 0
else:
# Do command completion here
if len(matches) == 1:
new_var = matches[0].items()[0][0] + ' '
self.cmd_line.add(new_var[len(variable):])
self.tab_count = 0
def do_command_tab(self, command_text):
"""Do the tab completion for a command
If the command is in the base commands, complete it there. If not,
attempt to perform tab completion for custom commands (if defined).
"""
# See if command is in the base command list first
matches = self.get_commands(command_text)
if len(matches) > 0:
self.do_base_command_tab(command_text, matches)
# Ok, not in command list, now check custom commands
elif self.custom_commands:
self.do_custom_tab(command_text)
def do_base_command_tab(self, command_text, matches):
"""Do the tab completion for a base command.
This method prints the list of base commands that match the
command. If the user pressed TAB twice, it displays the list of all
matches. If a single match is found, it returns the balance of the
command.
Note: this method gets its matches from do_command_tab.
command_text[in] Command
matches[in] Known matches (from do_command_tab)
"""
if self.tab_count == 2:
print "\n"
print_dictionary_list(['Command', 'Description'],
['name', 'text', 'alias'],
matches, self.width, True)
print
self.cmd_line.display_command()
self.tab_count = 0
else:
if len(matches) == 1:
new_cmd = matches[0]['name'] + ' '
self.tab_count = 0
self.cmd_line.add(new_cmd[len(command_text):])
def get_commands(self, cmd_prefix):
"""Get list of commands that match a prefix
cmd_prefix[in] prefix for name of command
Returns dictionary entry for command based on matching first n chars
"""
matches = []
stop = len(cmd_prefix)
start = 0
for cmd in self.base_commands:
if cmd['name'][start:stop] == cmd_prefix or \
cmd['alias'][start:stop] == cmd_prefix:
matches.append(cmd)
return matches
def show_command_help(self, commands):
"""Show the help for a list of commands.
commands[in] List of commands
"""
if self.quiet:
return
print
print_dictionary_list(['Command', 'Description'],
['name', 'text', 'alias'],
commands, self.width, True)
print
def _do_command(self, command):
"""Execute a command
This method routes the command to the appropriate methods for
execution.
command[in] Command to execute
Returns bool True - exit utility, False - do not exit
"""
# do variable replacement
command = self._replace_variables(command.strip(' '))
if self.options.get('verbosity', False):
print "\nExecuting command:", command
# process simple commands
if command.lower().startswith('set '):
self._add_variable(command[4:])
if not self.quiet:
print
elif command[0:11].lower() == 'show errors':
self.show_errors()
elif command[0:12].lower() == 'clear errors':
self.clear_errors()
elif command[0:15].lower() == 'show last error':
self.show_last_error()
elif command[0:14].lower() == 'show variables':
self.variables.show_variables()
elif self.custom_commands and command[0:12].lower() == 'show options':
self.show_custom_options()
else:
cmd, parameters = self._get_util_parameters(command)
cmd = cmd.strip()
parameters = parameters.strip()
if cmd.lower() == 'help':
self.show_help(parameters)
self.cmd_line.clear()
self.tab_count = 0
elif cmd == '':
print
elif cmd.lower() in ['exit', 'quit']:
print
return True
elif self.custom_commands:
if not self.is_valid_custom_command(cmd):
print "\n\nUnknown command: %s %s\n" % (cmd, parameters)
else:
try:
self.execute_custom_command(cmd, parameters)
print
except UtilError, err:
print err.errmsg
self.cmd_line.clear()
self.tab_count = 0
return False
class Console(object):
"""Console class
"""
def __init__(self, new_base_commands, options):
"""Constructor
new_base_commands Additions to the base commands
options[in] Options for the class member variables
"""
self.options = options
self.tab_count = 0
self.base_commands = []
self.base_commands.extend(new_base_commands)
self.base_commands.extend(_BASE_COMMANDS)
self.type_complete_mode = _COMMAND_COMPLETE
self.cmd_line = _Command(self.options.get('prompt', '> '))
self.width = self.options.get('width', 80)
self.commands = self.options.get("commands", None)
self.custom_commands = self.options.get("custom", False)
self.quiet = self.options.get("quiet", False)
self.variables = Variables(options)
self.history = _CommandHistory({'max_size': 20})
self.position = 0
self.errors = []
var_list = self.options.get('variables', [])
for var in var_list:
self.variables.add_variable(var['name'], var['value'])
def show_errors(self):
"""Show errors
Displays the errors captured when executing an utility.
"""
if self.quiet:
return
if not self.errors:
print
print("No errors to display.\n")
for error in self.errors:
print
print("{0}\n".format(error))
def clear_errors(self):
"""Clear errors
Clears captured errors occurring while executing an utility.
"""
if self.quiet:
return
self.errors = []
print
def show_last_error(self):
"""Show errors
Displays the last error occurred when executing an utility.
"""
if self.quiet:
return
if not self.errors:
print
print("No error to display.\n")
else:
print
print("{0}\n".format(self.errors[-1]))
def show_custom_command_help(self, arg):
"""Display the help for a custom command.
Note: Override this method for help on custom commands.
arg[in] Help command argument
"""
if self.quiet:
return
print "\nNo commands like '%s' exist.\n" % arg
def do_custom_tab(self, prefix):
"""Do custom tab key processing
Note: Override this method for tab completion for custom commands.
prefix[in] Prefix of the custom command
"""
pass
def do_custom_option_tab(self, prefix):
"""Do custom command option tab key processing
Note: Override this method for tab completion for options for custom
commands.
prefix[in] Prefix of the custom command
"""
if self.quiet:
return
print "\n\nNo custom commands found.\n"
@staticmethod
def is_valid_custom_command(command_text):
"""Is command a valid custom command?
This method evaluates the custom command for validity.
Note: Override this command to determine if command_text is a valid
custom command.
command_text[in] The complete command as entered by user
Returns bool - True if valid, False if not recognized
"""
return False # return False by default if method not overridden
def execute_custom_command(self, command, parameters):
"""Execute a custom command.
Note: Override this method to execute a custom command.
"""
pass
def show_custom_options(self):
"""Show custom options
Note: Override this for 'show options' functionality.
"""
if self.quiet:
return
def do_option_tab(self, prefix):
"""Do tab completion for options
This method will search for an option using the prefix passed. It
first searches the console commands defined at instantiation (the
general commands for the shell) and if not found, checks the
options for a custom command.
prefix[in] Prefix of the option
"""
full_command = self.cmd_line.get_command()
matches = self.get_commands(full_command.strip(' '))
if len(matches) > 0:
self.do_base_command_tab(full_command, matches)
elif self.custom_commands:
# if prefix is 'help', try command complete for custom commands
if full_command[0:4].lower() == 'help':
self.do_custom_tab(prefix)
else:
self.do_custom_option_tab(prefix)
def _set_complete_mode(self):
"""Set the tab completion mode
If the command buffer is only 1 part (command and no options),
we are in _COMMAND_COMPLETE mode.
Else if the nearest option contains a $ at the start, we are in
_VARIABLE_COMPLETE mode.
Else we are in _OPTION_COMPLETE mode.
_COMMAND_COMPLETE = tab complete for base and custom commands
_VARIABLE_COMPLETE = tab complete for user-defined variables
_OPTION_COMPLETE = tab complete for base or custom command options
"""
buf = self.cmd_line.get_command()
parts = buf.split(' ')
segment = ''
if (len(buf) > 0 and len(parts) == 1):
self.type_complete_mode = _COMMAND_COMPLETE
else:
segment = self.cmd_line.get_nearest_option()
if segment.find('$') > 0:
self.type_complete_mode = _VARIABLE_COMPLETE
else:
self.type_complete_mode = _OPTION_COMPLETE
return segment
def show_help(self, parameter):
"""Display the help for either all commands or the help for a
custom command.
parameter[in] Any parameter for the help command.
For example, 'help commands'
"""
if self.quiet:
return
if not parameter or (parameter and parameter.lower() == 'commands'):
print
print_dictionary_list(['Command', 'Description'],
['name', 'text', 'alias'],
self.base_commands, self.width, True)
print
else:
matches = self.get_commands(parameter)
if len(matches) > 0:
self.show_command_help(matches)
elif self.custom_commands:
self.show_custom_command_help(parameter)
def do_variable_tab(self, segment):
"""Do the tab completion for a variable
This method will attempt to find a variable in the list of user-
defined variables and complete the name of variable. If the user
types 'TAB' twice, it will display a list of all possible matches.
"""
# find the last $
variable = ''
start_var = 0
new_var = ''
stop = len(segment)
for i in range(stop - 1, 0, -1):
if segment[i] == ' ':
break
elif segment[i] == '$':
variable = segment[i + 1:]
start_var = i
if start_var == stop:
# show all of the variables
matches = self.variables.get_matches({})
else:
matches = self.variables.get_matches(variable)
if self.tab_count == 2:
if len(matches) > 0:
self.variables.show_variables(matches)
else:
self.variables.show_variables({})
self.cmd_line.display_command()
self.tab_count = 0
else:
# Do command completion here
if len(matches) == 1:
new_var = matches[0].items()[0][0] + ' '
self.cmd_line.add(new_var[len(variable):])
self.tab_count = 0
def do_command_tab(self, command_text):
"""Do the tab completion for a command
If the command is in the base commands, complete it there. If not,
attempt to perform tab completion for custom commands (if defined).
"""
# See if command is in the base command list first
matches = self.get_commands(command_text)
if len(matches) > 0:
self.do_base_command_tab(command_text, matches)
# Ok, not in command list, now check custom commands
elif self.custom_commands:
self.do_custom_tab(command_text)
def do_base_command_tab(self, command_text, matches):
"""Do the tab completion for a base command.
This method prints the list of base commands that match the
command. If the user pressed TAB twice, it displays the list of all
matches. If a single match is found, it returns the balance of the
command.
Note: this method gets its matches from do_command_tab.
command_text[in] Command
matches[in] Known matches (from do_command_tab)
"""
if self.tab_count == 2:
print "\n"
print_dictionary_list(['Command', 'Description'],
['name', 'text', 'alias'],
matches, self.width, True)
print
self.cmd_line.display_command()
self.tab_count = 0
else:
if len(matches) == 1:
if matches[0]['name'][:len(command_text)] == command_text:
new_cmd = matches[0]['name'] + ' '
else:
new_cmd = matches[0]['alias'] + ' '
self.tab_count = 0
self.cmd_line.add(new_cmd[len(command_text):])
def get_commands(self, cmd_prefix):
"""Get list of commands that match a prefix
cmd_prefix[in] prefix for name of command
Returns dictionary entry for command based on matching first n chars
"""
matches = []
stop = len(cmd_prefix)
start = 0
for cmd in self.base_commands:
if cmd['name'][start:stop] == cmd_prefix or \
cmd['alias'][start:stop] == cmd_prefix:
matches.append(cmd)
return matches
def show_command_help(self, commands):
"""Show the help for a list of commands.
commands[in] List of commands
"""
if self.quiet:
return
print
print_dictionary_list(['Command', 'Description'],
['name', 'text', 'alias'],
commands, self.width, True)
print
def _do_command(self, command):
"""Execute a command
This method routes the command to the appropriate methods for
execution.
command[in] Command to execute
Returns bool True - exit utility, False - do not exit
"""
# do variable replacement
command = self._replace_variables(command.strip(' '))
if self.options.get('verbosity', False):
print "\nExecuting command:", command
# process simple commands
if command.lower().startswith('set '):
self._add_variable(command[4:])
if not self.quiet:
print
elif command[0:11].lower() == 'show errors':
self.show_errors()
elif command[0:12].lower() == 'clear errors':
self.clear_errors()
elif command[0:15].lower() == 'show last error':
self.show_last_error()
elif command[0:14].lower() == 'show variables':
self.variables.show_variables()
elif self.custom_commands and command[0:12].lower() == 'show options':
self.show_custom_options()
else:
cmd, parameters = self._get_util_parameters(command)
if cmd is None:
return False
else:
if cmd.lower() == 'help':
token = parameters[0] if parameters else ''
self.show_help(token)
self.cmd_line.clear()
self.tab_count = 0
elif cmd == '':
print
elif cmd.lower() in ['exit', 'quit']:
print
return True
elif self.custom_commands:
if not self.is_valid_custom_command(cmd):
print("\n\nUnknown command: {0} {1}\n"
"".format(cmd, ' '.join(parameters)))
else:
try:
self.execute_custom_command(cmd, parameters)
print
except UtilError as err:
print err.errmsg
self.cmd_line.clear()
self.tab_count = 0
return False
def _process_command_keys(self, cmd_key):
"""Do the action associated with a command key.
This method will act on the recognized command keys and execute the
effect for each.
cmd_key[in] Key pressed
"""
if cmd_key in ['ESCAPE']:
self.cmd_line.erase_command()
elif cmd_key in ['DELETE_POSIX', 'DELETE_WIN', 'DELETE_MAC']:
self.cmd_line.delete_keypress()
self.tab_count = 0
elif cmd_key == 'ARROW_UP':
self.cmd_line.replace_command(self.history.previous())
elif cmd_key == 'ARROW_DN':
self.cmd_line.replace_command(self.history.next())
elif cmd_key == 'ARROW_LT':
self.cmd_line.left_arrow_keypress()
elif cmd_key == 'ARROW_RT':
self.cmd_line.right_arrow_keypress()
elif cmd_key in ['BACKSPACE_POSIX', 'BACKSPACE_WIN']:
self.cmd_line.backspace_keypress()
elif cmd_key == 'HOME':
self.cmd_line.home_keypress()
elif cmd_key == 'END':
self.cmd_line.end_keypress()
else: # 'TAB'
segment = self._set_complete_mode()
self.tab_count += 1
if self.type_complete_mode == _COMMAND_COMPLETE:
self.do_command_tab(self.cmd_line.get_command())
elif self.type_complete_mode == _OPTION_COMPLETE:
self.do_option_tab(segment)
else: # _VARIABLE_COMPLETE
self.do_variable_tab(segment)
cmd_key = ''
def _add_variable(self, set_command):
"""Add a variable to the list of variables.
This method adds the user-defined variable to the internal list.
set_command[in] Set command from the user
"""
if set_command.find('=') <= 0:
print "\n\nSET command invalid. Syntax: SET <NAME> = <value>"
return
# get name and value
name, value = set_command.split('=')
name = name.strip().strip('$')
value = value.strip()
self.variables.add_variable(name, value)
def _replace_variables(self, cmd_string):
"""Replace user-defined variables with values from the internal list.
This method replaces $VARNAME with the value stored when the set
command was issued.
cmd_string[in] Command from the user
Returns string - command string with replacements
"""
i = 1
new_cmd = cmd_string
while i > 0:
i = new_cmd.find('$', i)
if i > 0:
j = new_cmd.find(' ', i)
if j == -1:
j = len(new_cmd)
if j > i:
var_name = new_cmd[i + 1:j]
var = self.variables.find_variable(var_name)
if var is not None:
new_cmd = new_cmd[0:i] + var[var_name] + new_cmd[j:]
else:
i = j
return new_cmd
@staticmethod
def _get_util_parameters(cmd_string):
"""Split the command name from the command and return balance as
parameters.
cmd_string[in] Command
Returns tuple - command, list of parameters
"""
try:
tokens = shlex.split(cmd_string)
except ValueError as err:
print
print("WARNING: Unable to execute command, reason: {0}"
"".format(str(err)))
return None, None
else:
if len(tokens) > 1:
return tokens[0], tokens[1:]
return cmd_string.strip(' '), []
def get_user_command(self):
"""Get a command from the user.
This method displays a prompt to the user and returns when one of
the command keys is pressed.
"""
self.cmd_line.display_command()
cmd_string = ''
cmd_key = None
self.tab_count = 0
while cmd_key not in ['ENTER_POSIX', 'ENTER_WIN']:
key = getch()
# If a special key, act on it
if key in _COMMAND_KEY:
cmd_key = _COMMAND_KEY[key]
# Windows does things oddly for some keys
if not os.name == 'posix' and cmd_key == 'SPECIAL_WIN':
key = getch()
cmd_key = _WIN_COMMAND_KEY.get(key)
if cmd_key is None:
continue
self._process_command_keys(cmd_key)
cmd_string = self.cmd_line.get_command()
# else add key to command buffer
else:
cmd_string = self.cmd_line.get_command()
self.cmd_line.add(key)
cmd_string = self.cmd_line.get_command()
sys.stdout.flush()
self.position = 0
return cmd_string
def run_console(self, lines=None):
"""Run the console.
This method is the main loop for executing commands. For all subclassed
classes, the user need only call this method to execute an interactive
shell or execute commands and exit. It can be used in three modes:
1) it can process commands passed via lines list
2) it can process commands passed via a pipe to the python exec
3) it can prompt for commands and execute them as entered
Modes (1) and (2) execute all commands then exit.
lines[in] If not empty, execute the list of commands.
"""
if not lines:
lines = []
# If we have commands issued by the command line, execute and exit.
if self.commands is not None:
command_list = self.commands.split(';')
for command in command_list:
command = command.strip('\n').strip(' ')
if os.name == 'nt':
command = command.strip('"')
if self._do_command(command.strip('"')):
break
# If we have piped input, read the input by line and execute
elif not os.isatty(sys.stdin.fileno()) or len(lines) > 0:
for command in sys.stdin.readlines():
command_list = command.split(';')
for cmd in command_list:
cmd = cmd.strip('\n').strip(' ')
if os.name == 'nt':
cmd = cmd.strip('"')
if self._do_command(cmd.strip('"')):
break
# Otherwise, we are in an interactive mode where we get a command
# from the user and execute
else:
cmd = ''
if not self.quiet:
print self.options.get('welcome', 'Welcome to the console!\n')
while cmd.lower() not in ['exit', 'quit']:
command = self.get_user_command()
self.history.add(command)
if self._do_command(command):
break
if not self.quiet:
print self.options.get('goodbye',
'Thanks for using the console.\n')
