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"""
Utilities for writing command line tools.
$Id$
Copyright (C) 2010--2011 Internet Systems Consortium ("ISC")
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
"""
import cmd, glob, os.path, traceback
try:
import readline
have_readline = True
except ImportError:
have_readline = False
class BadCommandSyntax(Exception):
"Bad command line syntax."
class Cmd(cmd.Cmd):
"""
Customized subclass of Python cmd module.
"""
emptyline_repeats_last_command = False
EOF_exits_command_loop = True
identchars = cmd.IDENTCHARS + "/-."
histfile = None
last_command_failed = False
def __init__(self, argv = None):
cmd.Cmd.__init__(self)
if argv:
self.onecmd(" ".join(argv))
else:
self.cmdloop_with_history()
def onecmd(self, line):
"""
Wrap error handling around cmd.Cmd.onecmd(). Might want to do
something kinder than showing a traceback, eventually.
"""
self.last_command_failed = False
try:
return cmd.Cmd.onecmd(self, line)
except SystemExit:
raise
except BadCommandSyntax, e:
print e
except Exception:
traceback.print_exc()
self.last_command_failed = True
return False
def do_EOF(self, arg):
"""
Exit program.
"""
if self.EOF_exits_command_loop and self.prompt:
print
return self.EOF_exits_command_loop
def do_exit(self, arg):
"""
Exit program.
"""
return True
do_quit = do_exit
def emptyline(self):
"""
Handle an empty line. cmd module default is to repeat the last
command, which I find to be violation of the principal of least
astonishment, so my preference is that an empty line does nothing.
"""
if self.emptyline_repeats_last_command:
cmd.Cmd.emptyline(self)
def filename_complete(self, text, line, begidx, endidx):
"""
Filename completion handler, with hack to restore what I consider
the normal (bash-like) behavior when one hits the completion key
and there's only one match.
"""
result = glob.glob(text + "*")
if len(result) == 1:
path = result.pop()
if os.path.isdir(path) or (os.path.islink(path) and os.path.isdir(os.path.join(path, "."))):
result.append(path + os.path.sep)
else:
result.append(path + " ")
return result
def completenames(self, text, *ignored):
"""
Command name completion handler, with hack to restore what I
consider the normal (bash-like) behavior when one hits the
completion key and there's only one match.
"""
result = set(cmd.Cmd.completenames(self, text, *ignored))
if len(result) == 1:
result.add(result.pop() + " ")
return list(result)
def help_help(self):
"""
Type "help [topic]" for help on a command,
or just "help" for a list of commands.
"""
self.stdout.write(self.help_help.__doc__ + "\n")
def complete_help(self, *args):
"""
Better completion function for help command arguments.
"""
text = args[0]
names = self.get_names()
result = []
for prefix in ("do_", "help_"):
result.extend(s[len(prefix):] for s in names if s.startswith(prefix + text))
return result
if have_readline:
def cmdloop_with_history(self):
"""
Better command loop, with history file and tweaked readline
completion delimiters.
"""
old_completer_delims = readline.get_completer_delims()
if self.histfile is not None:
try:
readline.read_history_file(self.histfile)
except IOError:
pass
try:
readline.set_completer_delims("".join(set(old_completer_delims) - set(self.identchars)))
self.cmdloop()
finally:
if self.histfile is not None and readline.get_current_history_length():
readline.write_history_file(self.histfile)
readline.set_completer_delims(old_completer_delims)
else:
cmdloop_with_history = cmd.Cmd.cmdloop
def yes_or_no(prompt, default = None, require_full_word = False):
"""
Ask a yes-or-no question.
"""
prompt = prompt.rstrip() + _yes_or_no_prompts[default]
while True:
answer = raw_input(prompt).strip().lower()
if not answer and default is not None:
return default
if answer == "yes" or (not require_full_word and answer.startswith("y")):
return True
if answer == "no" or (not require_full_word and answer.startswith("n")):
return False
print 'Please answer "yes" or "no"'
_yes_or_no_prompts = {
True : ' ("yes" or "no" ["yes"]) ',
False : ' ("yes" or "no" ["no"]) ',
None : ' ("yes" or "no") ' }
|
