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1603 lines
56 KiB
Python
1603 lines
56 KiB
Python
# Copyright (c) 2002-2005 ActiveState Corp.
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# License: MIT (see LICENSE.txt for license details)
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# Author: Trent Mick (TrentM@ActiveState.com)
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# Home: http://trentm.com/projects/cmdln/
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from __future__ import print_function
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"""An improvement on Python's standard cmd.py module.
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As with cmd.py, this module provides "a simple framework for writing
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line-oriented command intepreters." This module provides a 'RawCmdln'
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class that fixes some design flaws in cmd.Cmd, making it more scalable
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and nicer to use for good 'cvs'- or 'svn'-style command line interfaces
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or simple shells. And it provides a 'Cmdln' class that add
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optparse-based option processing. Basically you use it like this:
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import cmdln
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class MySVN(cmdln.Cmdln):
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name = "svn"
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@cmdln.alias('stat', 'st')
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@cmdln.option('-v', '--verbose', action='store_true'
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help='print verbose information')
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def do_status(self, subcmd, opts, *paths):
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print "handle 'svn status' command"
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#...
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if __name__ == "__main__":
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shell = MySVN()
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retval = shell.main()
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sys.exit(retval)
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See the README.txt or <http://trentm.com/projects/cmdln/> for more
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details.
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"""
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__revision__ = "$Id: cmdln.py 1666 2007-05-09 03:13:03Z trentm $"
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__version_info__ = (1, 0, 0)
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__version__ = '.'.join(map(str, __version_info__))
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import os
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import re
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import cmd
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import optparse
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import sys
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import time
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from pprint import pprint
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from datetime import datetime
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# this is python 2.x style
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def introspect_handler_2(handler):
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# Extract the introspection bits we need.
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func = handler.im_func
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if func.func_defaults:
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func_defaults = func.func_defaults
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else:
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func_defaults = []
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return \
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func_defaults, \
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func.func_code.co_argcount, \
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func.func_code.co_varnames, \
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func.func_code.co_flags, \
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func
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def introspect_handler_3(handler):
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defaults = handler.__defaults__
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if not defaults:
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defaults = []
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else:
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defaults = list(handler.__defaults__)
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return \
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defaults, \
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handler.__code__.co_argcount, \
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handler.__code__.co_varnames, \
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handler.__code__.co_flags, \
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handler.__func__
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if sys.version_info[0] == 2:
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introspect_handler = introspect_handler_2
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bytes = lambda x, *args: x
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else:
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introspect_handler = introspect_handler_3
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#---- globals
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LOOP_ALWAYS, LOOP_NEVER, LOOP_IF_EMPTY = range(3)
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# An unspecified optional argument when None is a meaningful value.
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_NOT_SPECIFIED = ("Not", "Specified")
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# Pattern to match a TypeError message from a call that
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# failed because of incorrect number of arguments (see
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# Python/getargs.c).
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_INCORRECT_NUM_ARGS_RE = re.compile(
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r"(takes [\w ]+ )(\d+)( arguments? \()(\d+)( given\))")
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# Static bits of man page
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MAN_HEADER = r""".TH %(ucname)s "1" "%(date)s" "%(name)s %(version)s" "User Commands"
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.SH NAME
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%(name)s \- Program to do useful things.
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.SH SYNOPSIS
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.B %(name)s
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[\fIGLOBALOPTS\fR] \fISUBCOMMAND \fR[\fIOPTS\fR] [\fIARGS\fR...]
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.br
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.B %(name)s
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\fIhelp SUBCOMMAND\fR
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.SH DESCRIPTION
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"""
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MAN_COMMANDS_HEADER = r"""
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.SS COMMANDS
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"""
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MAN_OPTIONS_HEADER = r"""
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.SS GLOBAL OPTIONS
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"""
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MAN_FOOTER = r"""
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.SH AUTHOR
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This man page is automatically generated.
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"""
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#---- exceptions
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class CmdlnError(Exception):
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"""A cmdln.py usage error."""
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def __init__(self, msg):
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self.msg = msg
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def __str__(self):
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return self.msg
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class CmdlnUserError(Exception):
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"""An error by a user of a cmdln-based tool/shell."""
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pass
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#---- public methods and classes
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def alias(*aliases):
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"""Decorator to add aliases for Cmdln.do_* command handlers.
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Example:
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class MyShell(cmdln.Cmdln):
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@cmdln.alias("!", "sh")
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def do_shell(self, argv):
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#...implement 'shell' command
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"""
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def decorate(f):
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if not hasattr(f, "aliases"):
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f.aliases = []
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f.aliases += aliases
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return f
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return decorate
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MAN_REPLACES = [
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(re.compile(r'(^|[ \t\[\'\|])--([^/ \t/,-]*)-([^/ \t/,-]*)-([^/ \t/,-]*)-([^/ \t/,-]*)-([^/ \t/,\|-]*)(?=$|[ \t=\]\'/,\|])'), r'\1\-\-\2\-\3\-\4\-\5\-\6'),
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(re.compile(r'(^|[ \t\[\'\|])--([^/ \t/,-]*)-([^/ \t/,-]*)-([^/ \t/,-]*)-([^/ \t/,\|-]*)(?=$|[ \t=\]\'/,\|])'), r'\1\-\-\2\-\3\-\4\-\5'),
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(re.compile(r'(^|[ \t\[\'\|])--([^/ \t/,-]*)-([^/ \t/,-]*)-([^/ \t/,\|-]*)(?=$|[ \t=\]\'/,\|])'), r'\1\-\-\2\-\3\-\4'),
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(re.compile(r'(^|[ \t\[\'\|])-([^/ \t/,-]*)-([^/ \t/,-]*)-([^/ \t/,\|-]*)(?=$|[ \t=\]\'/,\|])'), r'\1\-\2\-\3\-\4'),
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(re.compile(r'(^|[ \t\[\'\|])--([^/ \t/,-]*)-([^/ \t/,\|-]*)(?=$|[ \t=\]\'/,\|])'), r'\1\-\-\2\-\3'),
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(re.compile(r'(^|[ \t\[\'\|])-([^/ \t/,-]*)-([^/ \t/,\|-]*)(?=$|[ \t=\]\'/,\|])'), r'\1\-\2\-\3'),
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(re.compile(r'(^|[ \t\[\'\|])--([^/ \t/,\|-]*)(?=$|[ \t=\]\'/,\|])'), r'\1\-\-\2'),
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(re.compile(r'(^|[ \t\[\'\|])-([^/ \t/,\|-]*)(?=$|[ \t=\]\'/,\|])'), r'\1\-\2'),
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(re.compile(r"^'"), r" '"),
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]
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def man_escape(text):
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'''
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Escapes text to be included in man page.
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For now it only escapes dashes in command line options.
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'''
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for repl in MAN_REPLACES:
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text = repl[0].sub(repl[1], text)
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return text
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class RawCmdln(cmd.Cmd):
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"""An improved (on cmd.Cmd) framework for building multi-subcommand
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scripts (think "svn" & "cvs") and simple shells (think "pdb" and
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"gdb").
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A simple example:
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import cmdln
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class MySVN(cmdln.RawCmdln):
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name = "svn"
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@cmdln.aliases('stat', 'st')
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def do_status(self, argv):
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print "handle 'svn status' command"
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if __name__ == "__main__":
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shell = MySVN()
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retval = shell.main()
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sys.exit(retval)
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See <http://trentm.com/projects/cmdln> for more information.
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"""
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name = None # if unset, defaults basename(sys.argv[0])
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prompt = None # if unset, defaults to self.name+"> "
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version = None # if set, default top-level options include --version
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# Default messages for some 'help' command error cases.
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# They are interpolated with one arg: the command.
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nohelp = "no help on '%s'"
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unknowncmd = "unknown command: '%s'"
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helpindent = '' # string with which to indent help output
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# Default man page parts, please change them in subclass
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man_header = MAN_HEADER
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man_commands_header = MAN_COMMANDS_HEADER
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man_options_header = MAN_OPTIONS_HEADER
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man_footer = MAN_FOOTER
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def __init__(self, completekey='tab',
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stdin=None, stdout=None, stderr=None):
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"""Cmdln(completekey='tab', stdin=None, stdout=None, stderr=None)
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The optional argument 'completekey' is the readline name of a
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completion key; it defaults to the Tab key. If completekey is
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not None and the readline module is available, command completion
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is done automatically.
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The optional arguments 'stdin', 'stdout' and 'stderr' specify
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alternate input, output and error output file objects; if not
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specified, sys.* are used.
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If 'stdout' but not 'stderr' is specified, stdout is used for
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error output. This is to provide least surprise for users used
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to only the 'stdin' and 'stdout' options with cmd.Cmd.
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"""
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if self.name is None:
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self.name = os.path.basename(sys.argv[0])
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if self.prompt is None:
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self.prompt = self.name+"> "
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self._name_str = self._str(self.name)
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self._prompt_str = self._str(self.prompt)
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if stdin is not None:
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self.stdin = stdin
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else:
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self.stdin = sys.stdin
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if stdout is not None:
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self.stdout = stdout
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else:
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self.stdout = sys.stdout
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if stderr is not None:
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self.stderr = stderr
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elif stdout is not None:
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self.stderr = stdout
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else:
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self.stderr = sys.stderr
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self.cmdqueue = []
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self.completekey = completekey
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self.cmdlooping = False
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def get_optparser(self):
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"""Hook for subclasses to set the option parser for the
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top-level command/shell.
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This option parser is used retrieved and used by `.main()' to
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handle top-level options.
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The default implements a single '-h|--help' option. Sub-classes
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can return None to have no options at the top-level. Typically
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an instance of CmdlnOptionParser should be returned.
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"""
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version = (self.version is not None
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and "%s %s" % (self._name_str, self.version)
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or None)
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return CmdlnOptionParser(self, version=version)
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def get_version(self):
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"""
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Returns version of program. To be replaced in subclass.
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"""
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return __version__
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def postoptparse(self):
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"""Hook method executed just after `.main()' parses top-level
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options.
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When called `self.values' holds the results of the option parse.
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"""
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pass
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def main(self, argv=None, loop=LOOP_NEVER):
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"""A possible mainline handler for a script, like so:
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import cmdln
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class MyCmd(cmdln.Cmdln):
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name = "mycmd"
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...
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if __name__ == "__main__":
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MyCmd().main()
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By default this will use sys.argv to issue a single command to
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'MyCmd', then exit. The 'loop' argument can be use to control
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interactive shell behaviour.
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Arguments:
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"argv" (optional, default sys.argv) is the command to run.
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It must be a sequence, where the first element is the
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command name and subsequent elements the args for that
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command.
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"loop" (optional, default LOOP_NEVER) is a constant
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indicating if a command loop should be started (i.e. an
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interactive shell). Valid values (constants on this module):
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LOOP_ALWAYS start loop and run "argv", if any
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LOOP_NEVER run "argv" (or .emptyline()) and exit
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LOOP_IF_EMPTY run "argv", if given, and exit;
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otherwise, start loop
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"""
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if argv is None:
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argv = sys.argv
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else:
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argv = argv[:] # don't modify caller's list
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self.optparser = self.get_optparser()
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if self.optparser: # i.e. optparser=None means don't process for opts
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try:
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self.options, args = self.optparser.parse_args(argv[1:])
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except CmdlnUserError as ex:
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msg = "%s: %s\nTry '%s help' for info.\n"\
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% (self.name, ex, self.name)
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self.stderr.write(self._str(msg))
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self.stderr.flush()
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return 1
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except StopOptionProcessing as ex:
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return 0
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else:
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self.options, args = None, argv[1:]
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self.postoptparse()
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if loop == LOOP_ALWAYS:
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if args:
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self.cmdqueue.append(args)
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return self.cmdloop()
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elif loop == LOOP_NEVER:
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if args:
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return self.cmd(args)
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else:
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return self.emptyline()
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elif loop == LOOP_IF_EMPTY:
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if args:
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return self.cmd(args)
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else:
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return self.cmdloop()
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def cmd(self, argv):
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"""Run one command and exit.
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"argv" is the arglist for the command to run. argv[0] is the
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command to run. If argv is an empty list then the
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'emptyline' handler is run.
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Returns the return value from the command handler.
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"""
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assert isinstance(argv, (list, tuple)), \
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"'argv' is not a sequence: %r" % argv
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retval = None
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try:
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argv = self.precmd(argv)
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retval = self.onecmd(argv)
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self.postcmd(argv)
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except:
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if not self.cmdexc(argv):
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raise
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retval = 1
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return retval
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def _str(self, s):
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"""Safely convert the given str/unicode to a string for printing."""
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try:
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return str(s)
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except UnicodeError:
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#XXX What is the proper encoding to use here? 'utf-8' seems
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# to work better than "getdefaultencoding" (usually
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# 'ascii'), on OS X at least.
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#return s.encode(sys.getdefaultencoding(), "replace")
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return s.encode("utf-8", "replace")
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def cmdloop(self, intro=None):
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"""Repeatedly issue a prompt, accept input, parse into an argv, and
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dispatch (via .precmd(), .onecmd() and .postcmd()), passing them
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the argv. In other words, start a shell.
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"intro" (optional) is a introductory message to print when
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starting the command loop. This overrides the class
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"intro" attribute, if any.
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"""
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self.cmdlooping = True
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self.preloop()
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if self.use_rawinput and self.completekey:
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try:
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import readline
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self.old_completer = readline.get_completer()
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readline.set_completer(self.complete)
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readline.parse_and_bind(self.completekey+": complete")
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except ImportError:
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pass
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try:
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if intro is None:
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intro = self.intro
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if intro:
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intro_str = self._str(intro)
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self.stdout.write(intro_str+'\n')
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self.stop = False
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retval = None
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while not self.stop:
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if self.cmdqueue:
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argv = self.cmdqueue.pop(0)
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assert isinstance(argv, (list, tuple)), \
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"item on 'cmdqueue' is not a sequence: %r" % argv
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else:
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if self.use_rawinput:
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try:
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try:
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#python 2.x
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line = raw_input(self._prompt_str)
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except NameError:
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line = input(self._prompt_str)
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except EOFError:
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line = 'EOF'
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else:
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self.stdout.write(self._prompt_str)
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self.stdout.flush()
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line = self.stdin.readline()
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if not len(line):
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line = 'EOF'
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else:
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line = line[:-1] # chop '\n'
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argv = line2argv(line)
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try:
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argv = self.precmd(argv)
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retval = self.onecmd(argv)
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self.postcmd(argv)
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except:
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if not self.cmdexc(argv):
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raise
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retval = 1
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self.lastretval = retval
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self.postloop()
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finally:
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if self.use_rawinput and self.completekey:
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try:
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import readline
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readline.set_completer(self.old_completer)
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except ImportError:
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pass
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self.cmdlooping = False
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return retval
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def precmd(self, argv):
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"""Hook method executed just before the command argv is
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interpreted, but after the input prompt is generated and issued.
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"argv" is the cmd to run.
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Returns an argv to run (i.e. this method can modify the command
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to run).
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"""
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return argv
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def postcmd(self, argv):
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"""Hook method executed just after a command dispatch is finished.
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"argv" is the command that was run.
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"""
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pass
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def cmdexc(self, argv):
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"""Called if an exception is raised in any of precmd(), onecmd(),
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or postcmd(). If True is returned, the exception is deemed to have
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been dealt with. Otherwise, the exception is re-raised.
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The default implementation handles CmdlnUserError's, which
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typically correspond to user error in calling commands (as
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opposed to programmer error in the design of the script using
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cmdln.py).
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"""
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exc_type, exc, traceback = sys.exc_info()
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if isinstance(exc, CmdlnUserError):
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msg = "%s %s: %s\nTry '%s help %s' for info.\n"\
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% (self.name, argv[0], exc, self.name, argv[0])
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self.stderr.write(self._str(msg))
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self.stderr.flush()
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return True
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def onecmd(self, argv):
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if not argv:
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return self.emptyline()
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self.lastcmd = argv
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cmdname = self._get_canonical_cmd_name(argv[0])
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if cmdname:
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handler = self._get_cmd_handler(cmdname)
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if handler:
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return self._dispatch_cmd(handler, argv)
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return self.default(argv)
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def _dispatch_cmd(self, handler, argv):
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return handler(argv)
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def default(self, argv):
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"""Hook called to handle a command for which there is no handler.
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"argv" is the command and arguments to run.
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|
|
The default implementation writes and error message to stderr
|
|
and returns an error exit status.
|
|
|
|
Returns a numeric command exit status.
|
|
"""
|
|
errmsg = self._str(self.unknowncmd % (argv[0],))
|
|
if self.cmdlooping:
|
|
self.stderr.write(errmsg+"\n")
|
|
else:
|
|
self.stderr.write("%s: %s\nTry '%s help' for info.\n"
|
|
% (self._name_str, errmsg, self._name_str))
|
|
self.stderr.flush()
|
|
return 1
|
|
|
|
def parseline(self, line):
|
|
# This is used by Cmd.complete (readline completer function) to
|
|
# massage the current line buffer before completion processing.
|
|
# We override to drop special '!' handling.
|
|
line = line.strip()
|
|
if not line:
|
|
return None, None, line
|
|
elif line[0] == '?':
|
|
line = 'help ' + line[1:]
|
|
i, n = 0, len(line)
|
|
while i < n and line[i] in self.identchars:
|
|
i = i+1
|
|
cmd, arg = line[:i], line[i:].strip()
|
|
return cmd, arg, line
|
|
|
|
def helpdefault(self, cmd, known):
|
|
"""Hook called to handle help on a command for which there is no
|
|
help handler.
|
|
|
|
"cmd" is the command name on which help was requested.
|
|
"known" is a boolean indicating if this command is known
|
|
(i.e. if there is a handler for it).
|
|
|
|
Returns a return code.
|
|
"""
|
|
if known:
|
|
msg = self._str(self.nohelp % (cmd,))
|
|
if self.cmdlooping:
|
|
self.stderr.write(msg + '\n')
|
|
else:
|
|
self.stderr.write("%s: %s\n" % (self.name, msg))
|
|
else:
|
|
msg = self.unknowncmd % (cmd,)
|
|
if self.cmdlooping:
|
|
self.stderr.write(msg + '\n')
|
|
else:
|
|
self.stderr.write("%s: %s\n"
|
|
"Try '%s help' for info.\n"
|
|
% (self.name, msg, self.name))
|
|
self.stderr.flush()
|
|
return 1
|
|
|
|
|
|
def do_help(self, argv):
|
|
"""${cmd_name}: give detailed help on a specific sub-command
|
|
|
|
usage:
|
|
${name} help [SUBCOMMAND]
|
|
"""
|
|
if len(argv) > 1: # asking for help on a particular command
|
|
doc = None
|
|
cmdname = self._get_canonical_cmd_name(argv[1]) or argv[1]
|
|
if not cmdname:
|
|
return self.helpdefault(argv[1], False)
|
|
else:
|
|
helpfunc = getattr(self, "help_"+cmdname, None)
|
|
if helpfunc:
|
|
doc = helpfunc()
|
|
else:
|
|
handler = self._get_cmd_handler(cmdname)
|
|
if handler:
|
|
doc = handler.__doc__
|
|
if doc is None:
|
|
return self.helpdefault(argv[1], handler != None)
|
|
else: # bare "help" command
|
|
doc = self.__class__.__doc__ # try class docstring
|
|
if doc is None:
|
|
# Try to provide some reasonable useful default help.
|
|
if self.cmdlooping:
|
|
prefix = ""
|
|
else:
|
|
prefix = self.name+' '
|
|
doc = """usage:
|
|
%sSUBCOMMAND [ARGS...]
|
|
%shelp [SUBCOMMAND]
|
|
|
|
${option_list}
|
|
${command_list}
|
|
${help_list}
|
|
""" % (prefix, prefix)
|
|
cmdname = None
|
|
|
|
if doc: # *do* have help content, massage and print that
|
|
doc = self._help_reindent(doc)
|
|
doc = self._help_preprocess(doc, cmdname)
|
|
doc = doc.rstrip() + '\n' # trim down trailing space
|
|
self.stdout.write(self._str(doc))
|
|
self.stdout.flush()
|
|
do_help.aliases = ["?"]
|
|
|
|
|
|
def do_man(self, argv):
|
|
"""${cmd_name}: generates a man page
|
|
|
|
usage:
|
|
${name} man
|
|
"""
|
|
mandate = datetime.utcfromtimestamp(int(os.environ.get('SOURCE_DATE_EPOCH', time.time())))
|
|
self.stdout.write(
|
|
self.man_header % {
|
|
'date': mandate.strftime('%b %Y'),
|
|
'version': self.get_version(),
|
|
'name': self.name,
|
|
'ucname': self.name.upper()
|
|
}
|
|
)
|
|
|
|
self.stdout.write(self.man_commands_header)
|
|
commands = self._help_get_command_list()
|
|
for command, doc in commands:
|
|
cmdname = command.split(' ')[0]
|
|
text = self._help_preprocess(doc, cmdname)
|
|
lines = []
|
|
for line in text.splitlines(False):
|
|
if line[:8] == ' ' * 8:
|
|
line = line[8:]
|
|
lines.append(man_escape(line))
|
|
|
|
self.stdout.write(
|
|
'.TP\n\\fB%s\\fR\n%s\n' % (command, '\n'.join(lines)))
|
|
|
|
self.stdout.write(self.man_options_header)
|
|
self.stdout.write(
|
|
man_escape(self._help_preprocess('${option_list}', None)))
|
|
|
|
self.stdout.write(self.man_footer)
|
|
|
|
self.stdout.flush()
|
|
|
|
def _help_reindent(self, help, indent=None):
|
|
"""Hook to re-indent help strings before writing to stdout.
|
|
|
|
"help" is the help content to re-indent
|
|
"indent" is a string with which to indent each line of the
|
|
help content after normalizing. If unspecified or None
|
|
then the default is use: the 'self.helpindent' class
|
|
attribute. By default this is the empty string, i.e.
|
|
no indentation.
|
|
|
|
By default, all common leading whitespace is removed and then
|
|
the lot is indented by 'self.helpindent'. When calculating the
|
|
common leading whitespace the first line is ignored -- hence
|
|
help content for Conan can be written as follows and have the
|
|
expected indentation:
|
|
|
|
def do_crush(self, ...):
|
|
'''${cmd_name}: crush your enemies, see them driven before you...
|
|
|
|
c.f. Conan the Barbarian'''
|
|
"""
|
|
if indent is None:
|
|
indent = self.helpindent
|
|
lines = help.splitlines(0)
|
|
_dedentlines(lines, skip_first_line=True)
|
|
lines = [(indent+line).rstrip() for line in lines]
|
|
return '\n'.join(lines)
|
|
|
|
def _help_preprocess(self, help, cmdname):
|
|
"""Hook to preprocess a help string before writing to stdout.
|
|
|
|
"help" is the help string to process.
|
|
"cmdname" is the canonical sub-command name for which help
|
|
is being given, or None if the help is not specific to a
|
|
command.
|
|
|
|
By default the following template variables are interpolated in
|
|
help content. (Note: these are similar to Python 2.4's
|
|
string.Template interpolation but not quite.)
|
|
|
|
${name}
|
|
The tool's/shell's name, i.e. 'self.name'.
|
|
${option_list}
|
|
A formatted table of options for this shell/tool.
|
|
${command_list}
|
|
A formatted table of available sub-commands.
|
|
${help_list}
|
|
A formatted table of additional help topics (i.e. 'help_*'
|
|
methods with no matching 'do_*' method).
|
|
${cmd_name}
|
|
The name (and aliases) for this sub-command formatted as:
|
|
"NAME (ALIAS1, ALIAS2, ...)".
|
|
${cmd_usage}
|
|
A formatted usage block inferred from the command function
|
|
signature.
|
|
${cmd_option_list}
|
|
A formatted table of options for this sub-command. (This is
|
|
only available for commands using the optparse integration,
|
|
i.e. using @cmdln.option decorators or manually setting the
|
|
'optparser' attribute on the 'do_*' method.)
|
|
|
|
Returns the processed help.
|
|
"""
|
|
preprocessors = {
|
|
"${name}": self._help_preprocess_name,
|
|
"${option_list}": self._help_preprocess_option_list,
|
|
"${command_list}": self._help_preprocess_command_list,
|
|
"${help_list}": self._help_preprocess_help_list,
|
|
"${cmd_name}": self._help_preprocess_cmd_name,
|
|
"${cmd_usage}": self._help_preprocess_cmd_usage,
|
|
"${cmd_option_list}": self._help_preprocess_cmd_option_list,
|
|
}
|
|
|
|
for marker, preprocessor in preprocessors.items():
|
|
if marker in help:
|
|
help = preprocessor(help, cmdname)
|
|
return help
|
|
|
|
def _help_preprocess_name(self, help, cmdname=None):
|
|
return help.replace("${name}", self.name)
|
|
|
|
def _help_preprocess_option_list(self, help, cmdname=None):
|
|
marker = "${option_list}"
|
|
indent, indent_width = _get_indent(marker, help)
|
|
suffix = _get_trailing_whitespace(marker, help)
|
|
|
|
if self.optparser:
|
|
# Setup formatting options and format.
|
|
# - Indentation of 4 is better than optparse default of 2.
|
|
# C.f. Damian Conway's discussion of this in Perl Best
|
|
# Practices.
|
|
self.optparser.formatter.indent_increment = 4
|
|
self.optparser.formatter.current_indent = indent_width
|
|
block = self.optparser.format_option_help() + '\n'
|
|
else:
|
|
block = ""
|
|
|
|
help_msg = help.replace(indent+marker+suffix, block, 1)
|
|
return help_msg
|
|
|
|
def _help_get_command_list(self):
|
|
# Find any aliases for commands.
|
|
token2canonical = self._get_canonical_map()
|
|
aliases = {}
|
|
for token, cmdname in token2canonical.items():
|
|
if token == cmdname:
|
|
continue
|
|
aliases.setdefault(cmdname, []).append(token)
|
|
|
|
# Get the list of (non-hidden) commands and their
|
|
# documentation, if any.
|
|
cmdnames = {} # use a dict to strip duplicates
|
|
for attr in self.get_names():
|
|
if attr.startswith("do_"):
|
|
cmdnames[attr[3:]] = True
|
|
linedata = []
|
|
for cmdname in sorted(cmdnames.keys()):
|
|
if aliases.get(cmdname):
|
|
a = sorted(aliases[cmdname])
|
|
cmdstr = "%s (%s)" % (cmdname, ", ".join(a))
|
|
else:
|
|
cmdstr = cmdname
|
|
doc = None
|
|
try:
|
|
helpfunc = getattr(self, 'help_'+cmdname)
|
|
except AttributeError:
|
|
handler = self._get_cmd_handler(cmdname)
|
|
if handler:
|
|
doc = handler.__doc__
|
|
else:
|
|
doc = helpfunc()
|
|
|
|
# Strip "${cmd_name}: " from the start of a command's doc. Best
|
|
# practice dictates that command help strings begin with this, but
|
|
# it isn't at all wanted for the command list.
|
|
to_strip = "${cmd_name}:"
|
|
if doc and doc.startswith(to_strip):
|
|
#log.debug("stripping %r from start of %s's help string",
|
|
# to_strip, cmdname)
|
|
doc = doc[len(to_strip):].lstrip()
|
|
if not getattr(self._get_cmd_handler(cmdname), "hidden", None):
|
|
linedata.append( (cmdstr, doc) )
|
|
|
|
return linedata
|
|
|
|
def _help_preprocess_command_list(self, help, cmdname=None):
|
|
marker = "${command_list}"
|
|
indent, indent_width = _get_indent(marker, help)
|
|
suffix = _get_trailing_whitespace(marker, help)
|
|
|
|
linedata = self._help_get_command_list()
|
|
|
|
if linedata:
|
|
subindent = indent + ' '*4
|
|
lines = _format_linedata(linedata, subindent, indent_width+4)
|
|
block = indent + "commands:\n" \
|
|
+ '\n'.join(lines) + "\n\n"
|
|
help = help.replace(indent+marker+suffix, block, 1)
|
|
return help
|
|
|
|
def _help_preprocess_help_list(self, help, cmdname=None):
|
|
marker = "${help_list}"
|
|
indent, indent_width = _get_indent(marker, help)
|
|
suffix = _get_trailing_whitespace(marker, help)
|
|
|
|
# Determine the additional help topics, if any.
|
|
helpnames = {}
|
|
token2cmdname = self._get_canonical_map()
|
|
for attr in self.get_names():
|
|
if not attr.startswith("help_"):
|
|
continue
|
|
helpname = attr[5:]
|
|
if helpname not in token2cmdname:
|
|
helpnames[helpname] = True
|
|
|
|
if helpnames:
|
|
helpnames = sorted(helpnames.keys())
|
|
linedata = [(self.name+" help "+n, "") for n in helpnames]
|
|
|
|
subindent = indent + ' '*4
|
|
lines = _format_linedata(linedata, subindent, indent_width+4)
|
|
block = indent + "additional help topics:\n" \
|
|
+ '\n'.join(lines) + "\n\n"
|
|
else:
|
|
block = ''
|
|
help_msg = help.replace(indent+marker+suffix, block, 1)
|
|
return help_msg
|
|
|
|
def _help_preprocess_cmd_name(self, help, cmdname=None):
|
|
marker = "${cmd_name}"
|
|
handler = self._get_cmd_handler(cmdname)
|
|
if not handler:
|
|
raise CmdlnError("cannot preprocess '%s' into help string: "
|
|
"could not find command handler for %r"
|
|
% (marker, cmdname))
|
|
s = cmdname
|
|
if hasattr(handler, "aliases"):
|
|
s += " (%s)" % (", ".join(handler.aliases))
|
|
help_msg = help.replace(marker, s)
|
|
return help_msg
|
|
|
|
#TODO: this only makes sense as part of the Cmdln class.
|
|
# Add hooks to add help preprocessing template vars and put
|
|
# this one on that class.
|
|
def _help_preprocess_cmd_usage(self, help, cmdname=None):
|
|
marker = "${cmd_usage}"
|
|
handler = self._get_cmd_handler(cmdname)
|
|
if not handler:
|
|
raise CmdlnError("cannot preprocess '%s' into help string: "
|
|
"could not find command handler for %r"
|
|
% (marker, cmdname))
|
|
indent, indent_width = _get_indent(marker, help)
|
|
suffix = _get_trailing_whitespace(marker, help)
|
|
|
|
func_defaults, co_argcount, co_varnames, co_flags, _ = introspect_handler(handler)
|
|
CO_FLAGS_ARGS = 4
|
|
CO_FLAGS_KWARGS = 8
|
|
|
|
# Adjust argcount for possible *args and **kwargs arguments.
|
|
argcount = co_argcount
|
|
if co_flags & CO_FLAGS_ARGS:
|
|
argcount += 1
|
|
if co_flags & CO_FLAGS_KWARGS:
|
|
argcount += 1
|
|
|
|
# Determine the usage string.
|
|
usage = "%s %s" % (self.name, cmdname)
|
|
if argcount <= 2: # handler ::= do_FOO(self, argv)
|
|
usage += " [ARGS...]"
|
|
elif argcount >= 3: # handler ::= do_FOO(self, subcmd, opts, ...)
|
|
argnames = list(co_varnames[3:argcount])
|
|
tail = ""
|
|
if co_flags & CO_FLAGS_KWARGS:
|
|
name = argnames.pop(-1)
|
|
import warnings
|
|
# There is no generally accepted mechanism for passing
|
|
# keyword arguments from the command line. Could
|
|
# *perhaps* consider: arg=value arg2=value2 ...
|
|
warnings.warn("argument '**%s' on '%s.%s' command "
|
|
"handler will never get values"
|
|
% (name, self.__class__.__name__,
|
|
getattr(func, "__name__", getattr(func, "func_name"))))
|
|
if co_flags & CO_FLAGS_ARGS:
|
|
name = argnames.pop(-1)
|
|
tail = "[%s...]" % name.upper()
|
|
while func_defaults:
|
|
func_defaults.pop(-1)
|
|
name = argnames.pop(-1)
|
|
tail = "[%s%s%s]" % (name.upper(), (tail and ' ' or ''), tail)
|
|
while argnames:
|
|
name = argnames.pop(-1)
|
|
tail = "%s %s" % (name.upper(), tail)
|
|
usage += ' ' + tail
|
|
|
|
block_lines = [
|
|
self.helpindent + "Usage:",
|
|
self.helpindent + ' '*4 + usage
|
|
]
|
|
block = '\n'.join(block_lines) + '\n\n'
|
|
|
|
help_msg = help.replace(indent+marker+suffix, block, 1)
|
|
return help_msg
|
|
|
|
#TODO: this only makes sense as part of the Cmdln class.
|
|
# Add hooks to add help preprocessing template vars and put
|
|
# this one on that class.
|
|
def _help_preprocess_cmd_option_list(self, help, cmdname=None):
|
|
marker = "${cmd_option_list}"
|
|
handler = self._get_cmd_handler(cmdname)
|
|
if not handler:
|
|
raise CmdlnError("cannot preprocess '%s' into help string: "
|
|
"could not find command handler for %r"
|
|
% (marker, cmdname))
|
|
indent, indent_width = _get_indent(marker, help)
|
|
suffix = _get_trailing_whitespace(marker, help)
|
|
if hasattr(handler, "optparser"):
|
|
# Setup formatting options and format.
|
|
# - Indentation of 4 is better than optparse default of 2.
|
|
# C.f. Damian Conway's discussion of this in Perl Best
|
|
# Practices.
|
|
handler.optparser.formatter.indent_increment = 4
|
|
handler.optparser.formatter.current_indent = indent_width
|
|
block = handler.optparser.format_option_help() + '\n'
|
|
else:
|
|
block = ""
|
|
|
|
help_msg = help.replace(indent+marker+suffix, block, 1)
|
|
return help_msg
|
|
|
|
def _get_canonical_cmd_name(self, token):
|
|
c_map = self._get_canonical_map()
|
|
return c_map.get(token, None)
|
|
|
|
def _get_canonical_map(self):
|
|
"""Return a mapping of available command names and aliases to
|
|
their canonical command name.
|
|
"""
|
|
cacheattr = "_token2canonical"
|
|
if not hasattr(self, cacheattr):
|
|
# Get the list of commands and their aliases, if any.
|
|
token2canonical = {}
|
|
cmd2funcname = {} # use a dict to strip duplicates
|
|
for attr in self.get_names():
|
|
if attr.startswith("do_"):
|
|
cmdname = attr[3:]
|
|
elif attr.startswith("_do_"):
|
|
cmdname = attr[4:]
|
|
else:
|
|
continue
|
|
cmd2funcname[cmdname] = attr
|
|
token2canonical[cmdname] = cmdname
|
|
for cmdname, funcname in cmd2funcname.items(): # add aliases
|
|
func = getattr(self, funcname)
|
|
aliases = getattr(func, "aliases", [])
|
|
for alias in aliases:
|
|
if alias in cmd2funcname:
|
|
import warnings
|
|
warnings.warn("'%s' alias for '%s' command conflicts "
|
|
"with '%s' handler"
|
|
% (alias, cmdname, cmd2funcname[alias]))
|
|
continue
|
|
token2canonical[alias] = cmdname
|
|
setattr(self, cacheattr, token2canonical)
|
|
return getattr(self, cacheattr)
|
|
|
|
def _get_cmd_handler(self, cmdname):
|
|
handler = None
|
|
try:
|
|
handler = getattr(self, 'do_' + cmdname)
|
|
except AttributeError:
|
|
try:
|
|
# Private command handlers begin with "_do_".
|
|
handler = getattr(self, '_do_' + cmdname)
|
|
except AttributeError:
|
|
pass
|
|
return handler
|
|
|
|
def _do_EOF(self, argv):
|
|
# Default EOF handler
|
|
# Note: an actual EOF is redirected to this command.
|
|
#TODO: separate name for this. Currently it is available from
|
|
# command-line. Is that okay?
|
|
self.stdout.write('\n')
|
|
self.stdout.flush()
|
|
self.stop = True
|
|
|
|
def emptyline(self):
|
|
# Different from cmd.Cmd: don't repeat the last command for an
|
|
# emptyline.
|
|
if self.cmdlooping:
|
|
pass
|
|
else:
|
|
return self.do_help(["help"])
|
|
|
|
|
|
#---- optparse.py extension to fix (IMO) some deficiencies
|
|
#
|
|
# See the class _OptionParserEx docstring for details.
|
|
#
|
|
|
|
class StopOptionProcessing(Exception):
|
|
"""Indicate that option *and argument* processing should stop
|
|
cleanly. This is not an error condition. It is similar in spirit to
|
|
StopIteration. This is raised by _OptionParserEx's default "help"
|
|
and "version" option actions and can be raised by custom option
|
|
callbacks too.
|
|
|
|
Hence the typical CmdlnOptionParser (a subclass of _OptionParserEx)
|
|
usage is:
|
|
|
|
parser = CmdlnOptionParser(mycmd)
|
|
parser.add_option("-f", "--force", dest="force")
|
|
...
|
|
try:
|
|
opts, args = parser.parse_args()
|
|
except StopOptionProcessing:
|
|
# normal termination, "--help" was probably given
|
|
sys.exit(0)
|
|
"""
|
|
|
|
class _OptionParserEx(optparse.OptionParser):
|
|
"""An optparse.OptionParser that uses exceptions instead of sys.exit.
|
|
|
|
This class is an extension of optparse.OptionParser that differs
|
|
as follows:
|
|
- Correct (IMO) the default OptionParser error handling to never
|
|
sys.exit(). Instead OptParseError exceptions are passed through.
|
|
- Add the StopOptionProcessing exception (a la StopIteration) to
|
|
indicate normal termination of option processing.
|
|
See StopOptionProcessing's docstring for details.
|
|
|
|
I'd also like to see the following in the core optparse.py, perhaps
|
|
as a RawOptionParser which would serve as a base class for the more
|
|
generally used OptionParser (that works as current):
|
|
- Remove the implicit addition of the -h|--help and --version
|
|
options. They can get in the way (e.g. if want '-?' and '-V' for
|
|
these as well) and it is not hard to do:
|
|
optparser.add_option("-h", "--help", action="help")
|
|
optparser.add_option("--version", action="version")
|
|
These are good practices, just not valid defaults if they can
|
|
get in the way.
|
|
"""
|
|
def error(self, msg):
|
|
raise optparse.OptParseError(msg)
|
|
|
|
def exit(self, status=0, msg=None):
|
|
if status == 0:
|
|
raise StopOptionProcessing(msg)
|
|
else:
|
|
#TODO: don't lose status info here
|
|
raise optparse.OptParseError(msg)
|
|
|
|
|
|
|
|
#---- optparse.py-based option processing support
|
|
|
|
class CmdlnOptionParser(_OptionParserEx):
|
|
"""An optparse.OptionParser class more appropriate for top-level
|
|
Cmdln options. For parsing of sub-command options, see
|
|
SubCmdOptionParser.
|
|
|
|
Changes:
|
|
- disable_interspersed_args() by default, because a Cmdln instance
|
|
has sub-commands which may themselves have options.
|
|
- Redirect print_help() to the Cmdln.do_help() which is better
|
|
equiped to handle the "help" action.
|
|
- error() will raise a CmdlnUserError: OptionParse.error() is meant
|
|
to be called for user errors. Raising a well-known error here can
|
|
make error handling clearer.
|
|
- Also see the changes in _OptionParserEx.
|
|
"""
|
|
def __init__(self, cmdln, **kwargs):
|
|
self.cmdln = cmdln
|
|
kwargs["prog"] = self.cmdln.name
|
|
_OptionParserEx.__init__(self, **kwargs)
|
|
self.disable_interspersed_args()
|
|
|
|
def print_help(self, file=None):
|
|
self.cmdln.onecmd(["help"])
|
|
|
|
def error(self, msg):
|
|
raise CmdlnUserError(msg)
|
|
|
|
|
|
class SubCmdOptionParser(_OptionParserEx):
|
|
def set_cmdln_info(self, cmdln, subcmd):
|
|
"""Called by Cmdln to pass relevant info about itself needed
|
|
for print_help().
|
|
"""
|
|
self.cmdln = cmdln
|
|
self.subcmd = subcmd
|
|
|
|
def print_help(self, file=None):
|
|
self.cmdln.onecmd(["help", self.subcmd])
|
|
|
|
def error(self, msg):
|
|
raise CmdlnUserError(msg)
|
|
|
|
|
|
def option(*args, **kwargs):
|
|
"""Decorator to add an option to the optparser argument of a Cmdln
|
|
subcommand.
|
|
|
|
Example:
|
|
class MyShell(cmdln.Cmdln):
|
|
@cmdln.option("-f", "--force", help="force removal")
|
|
def do_remove(self, subcmd, opts, *args):
|
|
#...
|
|
"""
|
|
#XXX Is there a possible optimization for many options to not have a
|
|
# large stack depth here?
|
|
def decorate(f):
|
|
if not hasattr(f, "optparser"):
|
|
f.optparser = SubCmdOptionParser()
|
|
f.optparser.add_option(*args, **kwargs)
|
|
return f
|
|
return decorate
|
|
|
|
def hide(*args):
|
|
"""For obsolete calls, hide them in help listings.
|
|
|
|
Example:
|
|
class MyShell(cmdln.Cmdln):
|
|
@cmdln.hide()
|
|
def do_shell(self, argv):
|
|
#...implement 'shell' command
|
|
"""
|
|
def decorate(f):
|
|
f.hidden = 1
|
|
return f
|
|
return decorate
|
|
|
|
|
|
class Cmdln(RawCmdln):
|
|
"""An improved (on cmd.Cmd) framework for building multi-subcommand
|
|
scripts (think "svn" & "cvs") and simple shells (think "pdb" and
|
|
"gdb").
|
|
|
|
A simple example:
|
|
|
|
import cmdln
|
|
|
|
class MySVN(cmdln.Cmdln):
|
|
name = "svn"
|
|
|
|
@cmdln.aliases('stat', 'st')
|
|
@cmdln.option('-v', '--verbose', action='store_true'
|
|
help='print verbose information')
|
|
def do_status(self, subcmd, opts, *paths):
|
|
print "handle 'svn status' command"
|
|
|
|
#...
|
|
|
|
if __name__ == "__main__":
|
|
shell = MySVN()
|
|
retval = shell.main()
|
|
sys.exit(retval)
|
|
|
|
'Cmdln' extends 'RawCmdln' by providing optparse option processing
|
|
integration. See this class' _dispatch_cmd() docstring and
|
|
<http://trentm.com/projects/cmdln> for more information.
|
|
"""
|
|
def _dispatch_cmd(self, handler, argv):
|
|
"""Introspect sub-command handler signature to determine how to
|
|
dispatch the command. The raw handler provided by the base
|
|
'RawCmdln' class is still supported:
|
|
|
|
def do_foo(self, argv):
|
|
# 'argv' is the vector of command line args, argv[0] is
|
|
# the command name itself (i.e. "foo" or an alias)
|
|
pass
|
|
|
|
In addition, if the handler has more than 2 arguments option
|
|
processing is automatically done (using optparse):
|
|
|
|
@cmdln.option('-v', '--verbose', action='store_true')
|
|
def do_bar(self, subcmd, opts, *args):
|
|
# subcmd = <"bar" or an alias>
|
|
# opts = <an optparse.Values instance>
|
|
if opts.verbose:
|
|
print "lots of debugging output..."
|
|
# args = <tuple of arguments>
|
|
for arg in args:
|
|
bar(arg)
|
|
|
|
TODO: explain that "*args" can be other signatures as well.
|
|
|
|
The `cmdln.option` decorator corresponds to an `add_option()`
|
|
method call on an `optparse.OptionParser` instance.
|
|
|
|
You can declare a specific number of arguments:
|
|
|
|
@cmdln.option('-v', '--verbose', action='store_true')
|
|
def do_bar2(self, subcmd, opts, bar_one, bar_two):
|
|
#...
|
|
|
|
and an appropriate error message will be raised/printed if the
|
|
command is called with a different number of args.
|
|
"""
|
|
co_argcount = introspect_handler(handler)[1]
|
|
if co_argcount == 2: # handler ::= do_foo(self, argv)
|
|
return handler(argv)
|
|
elif co_argcount >= 3: # handler ::= do_foo(self, subcmd, opts, ...)
|
|
try:
|
|
optparser = handler.optparser
|
|
except AttributeError:
|
|
optparser = introspect_handler(handler)[4].optparser = SubCmdOptionParser()
|
|
assert isinstance(optparser, SubCmdOptionParser)
|
|
optparser.set_cmdln_info(self, argv[0])
|
|
try:
|
|
opts, args = optparser.parse_args(argv[1:])
|
|
except StopOptionProcessing:
|
|
#TODO: this doesn't really fly for a replacement of
|
|
# optparse.py behaviour, does it?
|
|
return 0 # Normal command termination
|
|
|
|
try:
|
|
return handler(argv[0], opts, *args)
|
|
except TypeError as ex:
|
|
# Some TypeError's are user errors:
|
|
# do_foo() takes at least 4 arguments (3 given)
|
|
# do_foo() takes at most 5 arguments (6 given)
|
|
# do_foo() takes exactly 5 arguments (6 given)
|
|
# Raise CmdlnUserError for these with a suitably
|
|
# massaged error message.
|
|
tb = sys.exc_info()[2] # the traceback object
|
|
if tb.tb_next is not None:
|
|
# If the traceback is more than one level deep, then the
|
|
# TypeError do *not* happen on the "handler(...)" call
|
|
# above. In that we don't want to handle it specially
|
|
# here: it would falsely mask deeper code errors.
|
|
raise
|
|
msg = ex.args[0]
|
|
match = _INCORRECT_NUM_ARGS_RE.search(msg)
|
|
if match:
|
|
msg = list(match.groups())
|
|
msg[1] = int(msg[1]) - 3
|
|
if msg[1] == 1:
|
|
msg[2] = msg[2].replace("arguments", "argument")
|
|
msg[3] = int(msg[3]) - 3
|
|
msg = ''.join(map(str, msg))
|
|
raise CmdlnUserError(msg)
|
|
else:
|
|
raise
|
|
else:
|
|
raise CmdlnError("incorrect argcount for %s(): takes %d, must "
|
|
"take 2 for 'argv' signature or 3+ for 'opts' "
|
|
"signature" % (handler.__name__, co_argcount))
|
|
|
|
|
|
|
|
#---- internal support functions
|
|
|
|
def _format_linedata(linedata, indent, indent_width):
|
|
"""Format specific linedata into a pleasant layout.
|
|
|
|
"linedata" is a list of 2-tuples of the form:
|
|
(<item-display-string>, <item-docstring>)
|
|
"indent" is a string to use for one level of indentation
|
|
"indent_width" is a number of columns by which the
|
|
formatted data will be indented when printed.
|
|
|
|
The <item-display-string> column is held to 15 columns.
|
|
"""
|
|
lines = []
|
|
WIDTH = 78 - indent_width
|
|
SPACING = 3
|
|
MAX_NAME_WIDTH = 15
|
|
|
|
NAME_WIDTH = min(max([len(s) for s, d in linedata]), MAX_NAME_WIDTH)
|
|
DOC_WIDTH = WIDTH - NAME_WIDTH - SPACING
|
|
for namestr, doc in linedata:
|
|
line = indent + namestr
|
|
if len(namestr) <= NAME_WIDTH:
|
|
line += ' ' * (NAME_WIDTH + SPACING - len(namestr))
|
|
else:
|
|
lines.append(line)
|
|
line = indent + ' ' * (NAME_WIDTH + SPACING)
|
|
line += _summarize_doc(doc, DOC_WIDTH)
|
|
lines.append(line.rstrip())
|
|
return lines
|
|
|
|
def _summarize_doc(doc, length=60):
|
|
r"""Parse out a short one line summary from the given doclines.
|
|
|
|
"doc" is the doc string to summarize.
|
|
"length" is the max length for the summary
|
|
|
|
>>> _summarize_doc("this function does this")
|
|
'this function does this'
|
|
>>> _summarize_doc("this function does this", 10)
|
|
'this fu...'
|
|
>>> _summarize_doc("this function does this\nand that")
|
|
'this function does this and that'
|
|
>>> _summarize_doc("this function does this\n\nand that")
|
|
'this function does this'
|
|
"""
|
|
if doc is None:
|
|
return ""
|
|
assert length > 3, "length <= 3 is absurdly short for a doc summary"
|
|
doclines = doc.strip().splitlines(0)
|
|
if not doclines:
|
|
return ""
|
|
|
|
summlines = []
|
|
for i, line in enumerate(doclines):
|
|
stripped = line.strip()
|
|
if not stripped:
|
|
break
|
|
summlines.append(stripped)
|
|
if len(''.join(summlines)) >= length:
|
|
break
|
|
|
|
summary = ' '.join(summlines)
|
|
if len(summary) > length:
|
|
summary = summary[:length-3] + "..."
|
|
return summary
|
|
|
|
|
|
def line2argv(line):
|
|
r"""Parse the given line into an argument vector.
|
|
|
|
"line" is the line of input to parse.
|
|
|
|
This may get niggly when dealing with quoting and escaping. The
|
|
current state of this parsing may not be completely thorough/correct
|
|
in this respect.
|
|
|
|
>>> from cmdln import line2argv
|
|
>>> line2argv("foo")
|
|
['foo']
|
|
>>> line2argv("foo bar")
|
|
['foo', 'bar']
|
|
>>> line2argv("foo bar ")
|
|
['foo', 'bar']
|
|
>>> line2argv(" foo bar")
|
|
['foo', 'bar']
|
|
|
|
Quote handling:
|
|
|
|
>>> line2argv("'foo bar'")
|
|
['foo bar']
|
|
>>> line2argv('"foo bar"')
|
|
['foo bar']
|
|
>>> line2argv(r'"foo\"bar"')
|
|
['foo"bar']
|
|
>>> line2argv("'foo bar' spam")
|
|
['foo bar', 'spam']
|
|
>>> line2argv("'foo 'bar spam")
|
|
['foo bar', 'spam']
|
|
>>> line2argv("'foo")
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: command line is not terminated: unfinished single-quoted segment
|
|
>>> line2argv('"foo')
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: command line is not terminated: unfinished double-quoted segment
|
|
>>> line2argv('some\tsimple\ttests')
|
|
['some', 'simple', 'tests']
|
|
>>> line2argv('a "more complex" test')
|
|
['a', 'more complex', 'test']
|
|
>>> line2argv('a more="complex test of " quotes')
|
|
['a', 'more=complex test of ', 'quotes']
|
|
>>> line2argv('a more" complex test of " quotes')
|
|
['a', 'more complex test of ', 'quotes']
|
|
>>> line2argv('an "embedded \\"quote\\""')
|
|
['an', 'embedded "quote"']
|
|
"""
|
|
import string
|
|
line = line.strip()
|
|
argv = []
|
|
state = "default"
|
|
arg = None # the current argument being parsed
|
|
i = -1
|
|
while True:
|
|
i += 1
|
|
if i >= len(line):
|
|
break
|
|
ch = line[i]
|
|
|
|
if ch == "\\": # escaped char always added to arg, regardless of state
|
|
if arg is None:
|
|
arg = ""
|
|
i += 1
|
|
arg += line[i]
|
|
continue
|
|
|
|
if state == "single-quoted":
|
|
if ch == "'":
|
|
state = "default"
|
|
else:
|
|
arg += ch
|
|
elif state == "double-quoted":
|
|
if ch == '"':
|
|
state = "default"
|
|
else:
|
|
arg += ch
|
|
elif state == "default":
|
|
if ch == '"':
|
|
if arg is None:
|
|
arg = ""
|
|
state = "double-quoted"
|
|
elif ch == "'":
|
|
if arg is None:
|
|
arg = ""
|
|
state = "single-quoted"
|
|
elif ch in string.whitespace:
|
|
if arg is not None:
|
|
argv.append(arg)
|
|
arg = None
|
|
else:
|
|
if arg is None:
|
|
arg = ""
|
|
arg += ch
|
|
if arg is not None:
|
|
argv.append(arg)
|
|
if state != "default":
|
|
raise ValueError("command line is not terminated: unfinished %s "
|
|
"segment" % state)
|
|
return argv
|
|
|
|
|
|
def argv2line(argv):
|
|
r"""Put together the given argument vector into a command line.
|
|
|
|
"argv" is the argument vector to process.
|
|
|
|
>>> from cmdln import argv2line
|
|
>>> argv2line(['foo'])
|
|
'foo'
|
|
>>> argv2line(['foo', 'bar'])
|
|
'foo bar'
|
|
>>> argv2line(['foo', 'bar baz'])
|
|
'foo "bar baz"'
|
|
>>> argv2line(['foo"bar'])
|
|
'foo"bar'
|
|
>>> print argv2line(['foo" bar'])
|
|
'foo" bar'
|
|
>>> print argv2line(["foo' bar"])
|
|
"foo' bar"
|
|
>>> argv2line(["foo'bar"])
|
|
"foo'bar"
|
|
"""
|
|
escapedArgs = []
|
|
for arg in argv:
|
|
if ' ' in arg and '"' not in arg:
|
|
arg = '"'+arg+'"'
|
|
elif ' ' in arg and "'" not in arg:
|
|
arg = "'"+arg+"'"
|
|
elif ' ' in arg:
|
|
arg = arg.replace('"', r'\"')
|
|
arg = '"'+arg+'"'
|
|
escapedArgs.append(arg)
|
|
return ' '.join(escapedArgs)
|
|
|
|
|
|
# Recipe: dedent (0.1) in /Users/trentm/tm/recipes/cookbook
|
|
def _dedentlines(lines, tabsize=8, skip_first_line=False):
|
|
"""_dedentlines(lines, tabsize=8, skip_first_line=False) -> dedented lines
|
|
|
|
"lines" is a list of lines to dedent.
|
|
"tabsize" is the tab width to use for indent width calculations.
|
|
"skip_first_line" is a boolean indicating if the first line should
|
|
be skipped for calculating the indent width and for dedenting.
|
|
This is sometimes useful for docstrings and similar.
|
|
|
|
Same as dedent() except operates on a sequence of lines. Note: the
|
|
lines list is modified **in-place**.
|
|
"""
|
|
DEBUG = False
|
|
if DEBUG:
|
|
print("dedent: dedent(..., tabsize=%d, skip_first_line=%r)"\
|
|
% (tabsize, skip_first_line))
|
|
indents = []
|
|
margin = None
|
|
for i, line in enumerate(lines):
|
|
if i == 0 and skip_first_line:
|
|
continue
|
|
indent = 0
|
|
for ch in line:
|
|
if ch == ' ':
|
|
indent += 1
|
|
elif ch == '\t':
|
|
indent += tabsize - (indent % tabsize)
|
|
elif ch in '\r\n':
|
|
continue # skip all-whitespace lines
|
|
else:
|
|
break
|
|
else:
|
|
continue # skip all-whitespace lines
|
|
if DEBUG:
|
|
print("dedent: indent=%d: %r" % (indent, line))
|
|
if margin is None:
|
|
margin = indent
|
|
else:
|
|
margin = min(margin, indent)
|
|
if DEBUG:
|
|
print("dedent: margin=%r" % margin)
|
|
|
|
if margin is not None and margin > 0:
|
|
for i, line in enumerate(lines):
|
|
if i == 0 and skip_first_line:
|
|
continue
|
|
removed = 0
|
|
for j, ch in enumerate(line):
|
|
if ch == ' ':
|
|
removed += 1
|
|
elif ch == '\t':
|
|
removed += tabsize - (removed % tabsize)
|
|
elif ch in '\r\n':
|
|
if DEBUG:
|
|
print("dedent: %r: EOL -> strip up to EOL" % line)
|
|
lines[i] = lines[i][j:]
|
|
break
|
|
else:
|
|
raise ValueError("unexpected non-whitespace char %r in "
|
|
"line %r while removing %d-space margin"
|
|
% (ch, line, margin))
|
|
if DEBUG:
|
|
print("dedent: %r: %r -> removed %d/%d"\
|
|
% (line, ch, removed, margin))
|
|
if removed == margin:
|
|
lines[i] = lines[i][j+1:]
|
|
break
|
|
elif removed > margin:
|
|
lines[i] = ' '*(removed-margin) + lines[i][j+1:]
|
|
break
|
|
return lines
|
|
|
|
def _dedent(text, tabsize=8, skip_first_line=False):
|
|
"""_dedent(text, tabsize=8, skip_first_line=False) -> dedented text
|
|
|
|
"text" is the text to dedent.
|
|
"tabsize" is the tab width to use for indent width calculations.
|
|
"skip_first_line" is a boolean indicating if the first line should
|
|
be skipped for calculating the indent width and for dedenting.
|
|
This is sometimes useful for docstrings and similar.
|
|
|
|
textwrap.dedent(s), but don't expand tabs to spaces
|
|
"""
|
|
lines = text.splitlines(1)
|
|
_dedentlines(lines, tabsize=tabsize, skip_first_line=skip_first_line)
|
|
return ''.join(lines)
|
|
|
|
|
|
def _get_indent(marker, s, tab_width=8):
|
|
"""_get_indent(marker, s, tab_width=8) ->
|
|
(<indentation-of-'marker'>, <indentation-width>)"""
|
|
# Figure out how much the marker is indented.
|
|
INDENT_CHARS = tuple(' \t')
|
|
start = s.index(marker)
|
|
i = start
|
|
while i > 0:
|
|
if s[i-1] not in INDENT_CHARS:
|
|
break
|
|
i -= 1
|
|
indent = s[i:start]
|
|
indent_width = 0
|
|
for ch in indent:
|
|
if ch == ' ':
|
|
indent_width += 1
|
|
elif ch == '\t':
|
|
indent_width += tab_width - (indent_width % tab_width)
|
|
return indent, indent_width
|
|
|
|
def _get_trailing_whitespace(marker, s):
|
|
"""Return the whitespace content trailing the given 'marker' in string 's',
|
|
up to and including a newline.
|
|
"""
|
|
suffix = ''
|
|
start = s.index(marker) + len(marker)
|
|
i = start
|
|
while i < len(s):
|
|
if s[i] in ' \t':
|
|
suffix += s[i]
|
|
elif s[i] in '\r\n':
|
|
suffix += s[i]
|
|
if s[i] == '\r' and i+1 < len(s) and s[i+1] == '\n':
|
|
suffix += s[i+1]
|
|
break
|
|
else:
|
|
break
|
|
i += 1
|
|
return suffix
|
|
|
|
|
|
# vim: sw=4 et
|