--- /dev/null
+#!/usr/bin/env python
+# Copyright (c) 2002-2007 ActiveState Software Inc.
+# License: MIT (see LICENSE.txt for license details)
+# Author: Trent Mick
+# Home: http://trentm.com/projects/cmdln/
+
+"""An improvement on Python's standard cmd.py module.
+
+As with cmd.py, this module provides "a simple framework for writing
+line-oriented command intepreters." This module provides a 'RawCmdln'
+class that fixes some design flaws in cmd.Cmd, making it more scalable
+and nicer to use for good 'cvs'- or 'svn'-style command line interfaces
+or simple shells. And it provides a 'Cmdln' class that add
+optparse-based option processing. Basically you use it like this:
+
+ import cmdln
+
+ class MySVN(cmdln.Cmdln):
+ name = "svn"
+
+ @cmdln.alias('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)
+
+See the README.txt or <http://trentm.com/projects/cmdln/> for more
+details.
+"""
+
+__version_info__ = (1, 1, 2)
+__version__ = '.'.join(map(str, __version_info__))
+
+import os
+import sys
+import re
+import cmd
+import optparse
+from pprint import pprint
+import sys
+
+
+
+
+#---- globals
+
+LOOP_ALWAYS, LOOP_NEVER, LOOP_IF_EMPTY = range(3)
+
+# An unspecified optional argument when None is a meaningful value.
+_NOT_SPECIFIED = ("Not", "Specified")
+
+# Pattern to match a TypeError message from a call that
+# failed because of incorrect number of arguments (see
+# Python/getargs.c).
+_INCORRECT_NUM_ARGS_RE = re.compile(
+ r"(takes [\w ]+ )(\d+)( arguments? \()(\d+)( given\))")
+
+
+
+#---- exceptions
+
+class CmdlnError(Exception):
+ """A cmdln.py usage error."""
+ def __init__(self, msg):
+ self.msg = msg
+ def __str__(self):
+ return self.msg
+
+class CmdlnUserError(Exception):
+ """An error by a user of a cmdln-based tool/shell."""
+ pass
+
+
+
+#---- public methods and classes
+
+def alias(*aliases):
+ """Decorator to add aliases for Cmdln.do_* command handlers.
+
+ Example:
+ class MyShell(cmdln.Cmdln):
+ @cmdln.alias("!", "sh")
+ def do_shell(self, argv):
+ #...implement 'shell' command
+ """
+ def decorate(f):
+ if not hasattr(f, "aliases"):
+ f.aliases = []
+ f.aliases += aliases
+ return f
+ return decorate
+
+
+class RawCmdln(cmd.Cmd):
+ """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.RawCmdln):
+ name = "svn"
+
+ @cmdln.aliases('stat', 'st')
+ def do_status(self, argv):
+ print "handle 'svn status' command"
+
+ if __name__ == "__main__":
+ shell = MySVN()
+ retval = shell.main()
+ sys.exit(retval)
+
+ See <http://trentm.com/projects/cmdln> for more information.
+ """
+ name = None # if unset, defaults basename(sys.argv[0])
+ prompt = None # if unset, defaults to self.name+"> "
+ version = None # if set, default top-level options include --version
+
+ # Default messages for some 'help' command error cases.
+ # They are interpolated with one arg: the command.
+ nohelp = "no help on '%s'"
+ unknowncmd = "unknown command: '%s'"
+
+ helpindent = '' # string with which to indent help output
+
+ def __init__(self, completekey='tab',
+ stdin=None, stdout=None, stderr=None):
+ """Cmdln(completekey='tab', stdin=None, stdout=None, stderr=None)
+
+ The optional argument 'completekey' is the readline name of a
+ completion key; it defaults to the Tab key. If completekey is
+ not None and the readline module is available, command completion
+ is done automatically.
+
+ The optional arguments 'stdin', 'stdout' and 'stderr' specify
+ alternate input, output and error output file objects; if not
+ specified, sys.* are used.
+
+ If 'stdout' but not 'stderr' is specified, stdout is used for
+ error output. This is to provide least surprise for users used
+ to only the 'stdin' and 'stdout' options with cmd.Cmd.
+ """
+ import sys
+ if self.name is None:
+ self.name = os.path.basename(sys.argv[0])
+ if self.prompt is None:
+ self.prompt = self.name+"> "
+ self._name_str = self._str(self.name)
+ self._prompt_str = self._str(self.prompt)
+ if stdin is not None:
+ self.stdin = stdin
+ else:
+ self.stdin = sys.stdin
+ if stdout is not None:
+ self.stdout = stdout
+ else:
+ self.stdout = sys.stdout
+ if stderr is not None:
+ self.stderr = stderr
+ elif stdout is not None:
+ self.stderr = stdout
+ else:
+ self.stderr = sys.stderr
+ self.cmdqueue = []
+ self.completekey = completekey
+ self.cmdlooping = False
+
+ def get_optparser(self):
+ """Hook for subclasses to set the option parser for the
+ top-level command/shell.
+
+ This option parser is used retrieved and used by `.main()' to
+ handle top-level options.
+
+ The default implements a single '-h|--help' option. Sub-classes
+ can return None to have no options at the top-level. Typically
+ an instance of CmdlnOptionParser should be returned.
+ """
+ version = (self.version is not None
+ and "%s %s" % (self._name_str, self.version)
+ or None)
+ return CmdlnOptionParser(self, version=version)
+
+ def postoptparse(self):
+ """Hook method executed just after `.main()' parses top-level
+ options.
+
+ When called `self.options' holds the results of the option parse.
+ """
+ pass
+
+ def main(self, argv=None, loop=LOOP_NEVER):
+ """A possible mainline handler for a script, like so:
+
+ import cmdln
+ class MyCmd(cmdln.Cmdln):
+ name = "mycmd"
+ ...
+
+ if __name__ == "__main__":
+ MyCmd().main()
+
+ By default this will use sys.argv to issue a single command to
+ 'MyCmd', then exit. The 'loop' argument can be use to control
+ interactive shell behaviour.
+
+ Arguments:
+ "argv" (optional, default sys.argv) is the command to run.
+ It must be a sequence, where the first element is the
+ command name and subsequent elements the args for that
+ command.
+ "loop" (optional, default LOOP_NEVER) is a constant
+ indicating if a command loop should be started (i.e. an
+ interactive shell). Valid values (constants on this module):
+ LOOP_ALWAYS start loop and run "argv", if any
+ LOOP_NEVER run "argv" (or .emptyline()) and exit
+ LOOP_IF_EMPTY run "argv", if given, and exit;
+ otherwise, start loop
+ """
+ if argv is None:
+ import sys
+ argv = sys.argv
+ else:
+ argv = argv[:] # don't modify caller's list
+
+ self.optparser = self.get_optparser()
+ if self.optparser: # i.e. optparser=None means don't process for opts
+ try:
+ self.options, args = self.optparser.parse_args(argv[1:])
+ except CmdlnUserError, ex:
+ msg = "%s: %s\nTry '%s help' for info.\n"\
+ % (self.name, ex, self.name)
+ self.stderr.write(self._str(msg))
+ self.stderr.flush()
+ return 1
+ except StopOptionProcessing, ex:
+ return 0
+ else:
+ self.options, args = None, argv[1:]
+ self.postoptparse()
+
+ if loop == LOOP_ALWAYS:
+ if args:
+ self.cmdqueue.append(args)
+ return self.cmdloop()
+ elif loop == LOOP_NEVER:
+ if args:
+ return self.cmd(args)
+ else:
+ return self.emptyline()
+ elif loop == LOOP_IF_EMPTY:
+ if args:
+ return self.cmd(args)
+ else:
+ return self.cmdloop()
+
+ def cmd(self, argv):
+ """Run one command and exit.
+
+ "argv" is the arglist for the command to run. argv[0] is the
+ command to run. If argv is an empty list then the
+ 'emptyline' handler is run.
+
+ Returns the return value from the command handler.
+ """
+ assert isinstance(argv, (list, tuple)), \
+ "'argv' is not a sequence: %r" % argv
+ retval = None
+ try:
+ argv = self.precmd(argv)
+ retval = self.onecmd(argv)
+ self.postcmd(argv)
+ except:
+ if not self.cmdexc(argv):
+ raise
+ retval = 1
+ return retval
+
+ def _str(self, s):
+ """Safely convert the given str/unicode to a string for printing."""
+ try:
+ return str(s)
+ except UnicodeError:
+ #XXX What is the proper encoding to use here? 'utf-8' seems
+ # to work better than "getdefaultencoding" (usually
+ # 'ascii'), on OS X at least.
+ #import sys
+ #return s.encode(sys.getdefaultencoding(), "replace")
+ return s.encode("utf-8", "replace")
+
+ def cmdloop(self, intro=None):
+ """Repeatedly issue a prompt, accept input, parse into an argv, and
+ dispatch (via .precmd(), .onecmd() and .postcmd()), passing them
+ the argv. In other words, start a shell.
+
+ "intro" (optional) is a introductory message to print when
+ starting the command loop. This overrides the class
+ "intro" attribute, if any.
+ """
+ self.cmdlooping = True
+ self.preloop()
+ if self.use_rawinput and self.completekey:
+ try:
+ import readline
+ self.old_completer = readline.get_completer()
+ readline.set_completer(self.complete)
+ readline.parse_and_bind(self.completekey+": complete")
+ except ImportError:
+ pass
+ try:
+ if intro is None:
+ intro = self.intro
+ if intro:
+ intro_str = self._str(intro)
+ self.stdout.write(intro_str+'\n')
+ self.stop = False
+ retval = None
+ while not self.stop:
+ if self.cmdqueue:
+ argv = self.cmdqueue.pop(0)
+ assert isinstance(argv, (list, tuple)), \
+ "item on 'cmdqueue' is not a sequence: %r" % argv
+ else:
+ if self.use_rawinput:
+ try:
+ line = raw_input(self._prompt_str)
+ except EOFError:
+ line = 'EOF'
+ else:
+ self.stdout.write(self._prompt_str)
+ self.stdout.flush()
+ line = self.stdin.readline()
+ if not len(line):
+ line = 'EOF'
+ else:
+ line = line[:-1] # chop '\n'
+ argv = line2argv(line)
+ try:
+ argv = self.precmd(argv)
+ retval = self.onecmd(argv)
+ self.postcmd(argv)
+ except:
+ if not self.cmdexc(argv):
+ raise
+ retval = 1
+ self.lastretval = retval
+ self.postloop()
+ finally:
+ if self.use_rawinput and self.completekey:
+ try:
+ import readline
+ readline.set_completer(self.old_completer)
+ except ImportError:
+ pass
+ self.cmdlooping = False
+ return retval
+
+ def precmd(self, argv):
+ """Hook method executed just before the command argv is
+ interpreted, but after the input prompt is generated and issued.
+
+ "argv" is the cmd to run.
+
+ Returns an argv to run (i.e. this method can modify the command
+ to run).
+ """
+ return argv
+
+ def postcmd(self, argv):
+ """Hook method executed just after a command dispatch is finished.
+
+ "argv" is the command that was run.
+ """
+ pass
+
+ def cmdexc(self, argv):
+ """Called if an exception is raised in any of precmd(), onecmd(),
+ or postcmd(). If True is returned, the exception is deemed to have
+ been dealt with. Otherwise, the exception is re-raised.
+
+ The default implementation handles CmdlnUserError's, which
+ typically correspond to user error in calling commands (as
+ opposed to programmer error in the design of the script using
+ cmdln.py).
+ """
+ import sys
+ type, exc, traceback = sys.exc_info()
+ if isinstance(exc, CmdlnUserError):
+ msg = "%s %s: %s\nTry '%s help %s' for info.\n"\
+ % (self.name, argv[0], exc, self.name, argv[0])
+ self.stderr.write(self._str(msg))
+ self.stderr.flush()
+ return True
+
+ def onecmd(self, argv):
+ if not argv:
+ return self.emptyline()
+ self.lastcmd = argv
+ cmdname = self._get_canonical_cmd_name(argv[0])
+ if cmdname:
+ handler = self._get_cmd_handler(cmdname)
+ if handler:
+ return self._dispatch_cmd(handler, argv)
+ return self.default(argv)
+
+ def _dispatch_cmd(self, handler, argv):
+ return handler(argv)
+
+ def default(self, argv):
+ """Hook called to handle a command for which there is no handler.
+
+ "argv" is the command and arguments to run.
+
+ 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 [COMMAND]
+ """
+ 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:
+ %sCOMMAND [ARGS...]
+ %shelp [COMMAND]
+
+ ${option_list}
+ ${command_list}
+ ${help_list}
+ """ % (prefix, prefix)
+ cmdname = None
+
+ if doc: # *do* have help content, massage and print that
+ doc = self._help_reindent(doc)
+ doc = self._help_preprocess(doc, cmdname)
+ doc = doc.rstrip() + '\n' # trim down trailing space
+ self.stdout.write(self._str(doc))
+ self.stdout.flush()
+ do_help.aliases = ["?"]
+
+ def _help_reindent(self, help, indent=None):
+ """Hook to re-indent help strings before writing to stdout.
+
+ "help" is the help content to re-indent
+ "indent" is a string with which to indent each line of the
+ help content after normalizing. If unspecified or None
+ then the default is use: the 'self.helpindent' class
+ attribute. By default this is the empty string, i.e.
+ no indentation.
+
+ By default, all common leading whitespace is removed and then
+ the lot is indented by 'self.helpindent'. When calculating the
+ common leading whitespace the first line is ignored -- hence
+ help content for Conan can be written as follows and have the
+ expected indentation:
+
+ def do_crush(self, ...):
+ '''${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 = help.replace(indent+marker+suffix, block, 1)
+ return help
+
+
+ def _help_preprocess_command_list(self, help, cmdname=None):
+ marker = "${command_list}"
+ indent, indent_width = _get_indent(marker, help)
+ suffix = _get_trailing_whitespace(marker, help)
+
+ # Find any aliases for commands.
+ token2canonical = self._get_canonical_map()
+ aliases = {}
+ for token, cmdname in token2canonical.items():
+ if token == cmdname: continue
+ aliases.setdefault(cmdname, []).append(token)
+
+ # Get the list of (non-hidden) commands and their
+ # documentation, if any.
+ cmdnames = {} # use a dict to strip duplicates
+ for attr in self.get_names():
+ if attr.startswith("do_"):
+ cmdnames[attr[3:]] = True
+ cmdnames = cmdnames.keys()
+ cmdnames.sort()
+ linedata = []
+ for cmdname in cmdnames:
+ if aliases.get(cmdname):
+ a = aliases[cmdname]
+ a.sort()
+ cmdstr = "%s (%s)" % (cmdname, ", ".join(a))
+ else:
+ cmdstr = cmdname
+ doc = None
+ try:
+ helpfunc = getattr(self, 'help_'+cmdname)
+ except AttributeError:
+ handler = self._get_cmd_handler(cmdname)
+ if handler:
+ doc = handler.__doc__
+ else:
+ doc = helpfunc()
+
+ # Strip "${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 = "${cmd_name}:"
+ if doc and doc.startswith(to_strip):
+ #log.debug("stripping %r from start of %s's help string",
+ # to_strip, cmdname)
+ doc = doc[len(to_strip):].lstrip()
+ linedata.append( (cmdstr, doc) )
+
+ if linedata:
+ subindent = indent + ' '*4
+ lines = _format_linedata(linedata, subindent, indent_width+4)
+ block = indent + "Commands:\n" \
+ + '\n'.join(lines) + "\n\n"
+ help = help.replace(indent+marker+suffix, block, 1)
+ return help
+
+ def _gen_names_and_attrs(self):
+ # Inheritance says we have to look in class and
+ # base classes; order is not important.
+ names = []
+ classes = [self.__class__]
+ while classes:
+ aclass = classes.pop(0)
+ if aclass.__bases__:
+ classes = classes + list(aclass.__bases__)
+ for name in dir(aclass):
+ yield (name, getattr(aclass, name))
+
+ def _help_preprocess_help_list(self, help, cmdname=None):
+ marker = "${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 attrname, attr in self._gen_names_and_attrs():
+ if not attrname.startswith("help_"): continue
+ helpname = attrname[5:]
+ if helpname not in token2cmdname:
+ helpnames[helpname] = attr
+
+ if helpnames:
+ linedata = [(n, a.__doc__ or "") for n, a in helpnames.items()]
+ linedata.sort()
+
+ subindent = indent + ' '*4
+ lines = _format_linedata(linedata, subindent, indent_width+4)
+ block = (indent
+ + "Additional help topics (run `%s help TOPIC'):\n" % self.name
+ + '\n'.join(lines)
+ + "\n\n")
+ else:
+ block = ''
+ help = help.replace(indent+marker+suffix, block, 1)
+ return help
+
+ def _help_preprocess_cmd_name(self, help, cmdname=None):
+ marker = "${cmd_name}"
+ handler = self._get_cmd_handler(cmdname)
+ if not handler:
+ raise CmdlnError("cannot preprocess '%s' into help string: "
+ "could not find command handler for %r"
+ % (marker, cmdname))
+ s = cmdname
+ if hasattr(handler, "aliases"):
+ s += " (%s)" % (", ".join(handler.aliases))
+ help = help.replace(marker, s)
+ return help
+
+ #TODO: this only makes sense as part of the Cmdln class.
+ # Add hooks to add help preprocessing template vars and put
+ # this one on that class.
+ def _help_preprocess_cmd_usage(self, help, cmdname=None):
+ marker = "${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)
+
+ # Extract the introspection bits we need.
+ func = handler.im_func
+ if func.func_defaults:
+ func_defaults = list(func.func_defaults)
+ else:
+ func_defaults = []
+ co_argcount = func.func_code.co_argcount
+ co_varnames = func.func_code.co_varnames
+ co_flags = func.func_code.co_flags
+ 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__,
+ 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 = help.replace(indent+marker+suffix, block, 1)
+ return help
+
+ #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 = help.replace(indent+marker+suffix, block, 1)
+ return help
+
+ def _get_canonical_cmd_name(self, token):
+ map = self._get_canonical_map()
+ return 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
+
+
+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 = handler.im_func.func_code.co_argcount
+ 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 = handler.im_func.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, 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.
+ import sys
+ 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 = 2
+ NAME_WIDTH_LOWER_BOUND = 13
+ NAME_WIDTH_UPPER_BOUND = 16
+ NAME_WIDTH = max([len(s) for s,d in linedata])
+ if NAME_WIDTH < NAME_WIDTH_LOWER_BOUND:
+ NAME_WIDTH = NAME_WIDTH_LOWER_BOUND
+ else:
+ NAME_WIDTH = NAME_WIDTH_UPPER_BOUND
+
+ 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'
+ """
+ import re
+ 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('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"']
+
+ # Komodo bug 48027
+ >>> line2argv('foo bar C:\\')
+ ['foo', 'bar', 'C:\\']
+
+ # Komodo change 127581
+ >>> line2argv(r'"\test\slash" "foo bar" "foo\"bar"')
+ ['\\test\\slash', 'foo bar', 'foo"bar']
+
+ # Komodo change 127629
+ >>> if sys.platform == "win32":
+ ... line2argv(r'\foo\bar') == ['\\foo\\bar']
+ ... line2argv(r'\\foo\\bar') == ['\\\\foo\\\\bar']
+ ... line2argv('"foo') == ['foo']
+ ... else:
+ ... line2argv(r'\foo\bar') == ['foobar']
+ ... line2argv(r'\\foo\\bar') == ['\\foo\\bar']
+ ... try:
+ ... line2argv('"foo')
+ ... except ValueError, ex:
+ ... "not terminated" in str(ex)
+ True
+ True
+ True
+ """
+ import string
+ line = line.strip()
+ argv = []
+ state = "default"
+ arg = None # the current argument being parsed
+ i = -1
+ while 1:
+ i += 1
+ if i >= len(line): break
+ ch = line[i]
+
+ if ch == "\\" and i+1 < len(line):
+ # escaped char always added to arg, regardless of state
+ if arg is None: arg = ""
+ if (sys.platform == "win32"
+ or state in ("double-quoted", "single-quoted")
+ ) and line[i+1] not in tuple('"\''):
+ arg += ch
+ 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 not sys.platform == "win32" and 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
+
+
+
+#---- bash completion support
+# Note: This is still experimental. I expect to change this
+# significantly.
+#
+# To get Bash completion for a cmdln.Cmdln class, run the following
+# bash command:
+# $ complete -C 'python -m cmdln /path/to/script.py CmdlnClass' cmdname
+# For example:
+# $ complete -C 'python -m cmdln ~/bin/svn.py SVN' svn
+#
+#TODO: Simplify the above so don't have to given path to script (try to
+# find it on PATH, if possible). Could also make class name
+# optional if there is only one in the module (common case).
+
+if __name__ == "__main__" and len(sys.argv) == 6:
+ def _log(s):
+ return # no-op, comment out for debugging
+ from os.path import expanduser
+ fout = open(expanduser("~/tmp/bashcpln.log"), 'a')
+ fout.write(str(s) + '\n')
+ fout.close()
+
+ # Recipe: module_from_path (1.0.1+)
+ def _module_from_path(path):
+ import imp, os, sys
+ path = os.path.expanduser(path)
+ dir = os.path.dirname(path) or os.curdir
+ name = os.path.splitext(os.path.basename(path))[0]
+ sys.path.insert(0, dir)
+ try:
+ iinfo = imp.find_module(name, [dir])
+ return imp.load_module(name, *iinfo)
+ finally:
+ sys.path.remove(dir)
+
+ def _get_bash_cplns(script_path, class_name, cmd_name,
+ token, preceding_token):
+ _log('--')
+ _log('get_cplns(%r, %r, %r, %r, %r)'
+ % (script_path, class_name, cmd_name, token, preceding_token))
+ comp_line = os.environ["COMP_LINE"]
+ comp_point = int(os.environ["COMP_POINT"])
+ _log("COMP_LINE: %r" % comp_line)
+ _log("COMP_POINT: %r" % comp_point)
+
+ try:
+ script = _module_from_path(script_path)
+ except ImportError, ex:
+ _log("error importing `%s': %s" % (script_path, ex))
+ return []
+ shell = getattr(script, class_name)()
+ cmd_map = shell._get_canonical_map()
+ del cmd_map["EOF"]
+
+ # Determine if completing the sub-command name.
+ parts = comp_line[:comp_point].split(None, 1)
+ _log(parts)
+ if len(parts) == 1 or not (' ' in parts[1] or '\t' in parts[1]):
+ #TODO: if parts[1].startswith('-'): handle top-level opts
+ _log("complete sub-command names")
+ matches = {}
+ for name, canon_name in cmd_map.items():
+ if name.startswith(token):
+ matches[name] = canon_name
+ if not matches:
+ return []
+ elif len(matches) == 1:
+ return matches.keys()
+ elif len(set(matches.values())) == 1:
+ return [matches.values()[0]]
+ else:
+ return matches.keys()
+
+ # Otherwise, complete options for the given sub-command.
+ #TODO: refine this so it does the right thing with option args
+ if token.startswith('-'):
+ cmd_name = comp_line.split(None, 2)[1]
+ try:
+ cmd_canon_name = cmd_map[cmd_name]
+ except KeyError:
+ return []
+ handler = shell._get_cmd_handler(cmd_canon_name)
+ optparser = getattr(handler, "optparser", None)
+ if optparser is None:
+ optparser = SubCmdOptionParser()
+ opt_strs = []
+ for option in optparser.option_list:
+ for opt_str in option._short_opts + option._long_opts:
+ if opt_str.startswith(token):
+ opt_strs.append(opt_str)
+ return opt_strs
+
+ return []
+
+ for cpln in _get_bash_cplns(*sys.argv[1:]):
+ print cpln
+
projects / tools / gbs.git / commitdiff