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302 lines
9.9 KiB
Python
302 lines
9.9 KiB
Python
"""
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A modern, lightweight alternative to cmdln.py from https://github.com/trentm/cmdln
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"""
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import argparse
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import inspect
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import sys
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def option(*args, **kwargs):
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"""
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Decorator to add an option to the optparser argument of a Cmdln subcommand.
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Example:
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class MyShell(cmdln.Cmdln):
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@cmdln.option("-f", "--force", help="force removal")
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def do_remove(self, subcmd, opts, *args):
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#...
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"""
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def decorate(f):
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if not hasattr(f, "options"):
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f.options = []
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new_args = [i for i in args if i]
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f.options.insert(0, (new_args, kwargs))
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return f
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return decorate
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def alias(*aliases):
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"""
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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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def name(name):
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"""
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Decorator to explicitly name a Cmdln subcommand.
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Example:
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class MyShell(cmdln.Cmdln):
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@cmdln.name("cmd-with-dashes")
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def do_cmd_with_dashes(self, subcmd, opts):
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#...
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"""
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def decorate(f):
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f.name = name
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return f
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return decorate
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def hide(value=True):
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"""
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For obsolete calls, hide them in help listings.
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Example:
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class MyShell(cmdln.Cmdln):
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@cmdln.hide()
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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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f.hidden = bool(value)
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return f
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return decorate
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class HelpFormatter(argparse.RawDescriptionHelpFormatter):
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def _format_action(self, action):
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if isinstance(action, argparse._SubParsersAction):
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parts = []
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subactions = action._get_subactions()
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subactions.sort(key=lambda x: x.metavar)
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for i in subactions:
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if i.help == argparse.SUPPRESS:
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# don't display commands with suppressed help
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continue
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if len(i.metavar) > 20:
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parts.append("%*s%-21s" % (self._current_indent, "", i.metavar))
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parts.append("%*s %s" % (self._current_indent + 21, "", i.help))
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else:
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parts.append("%*s%-21s %s" % (self._current_indent, "", i.metavar, i.help))
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return "\n".join(parts)
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return super()._format_action(action)
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class Cmdln:
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def get_argparser_usage(self):
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return "%(prog)s [global opts] <command> [--help] [opts] [args]"
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def get_subcommand_prog(self, subcommand):
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return f"{self.argparser.prog} [global opts] {subcommand}"
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def _remove_leading_spaces_from_text(self, text):
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lines = text.splitlines()
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lines = self._remove_leading_spaces_from_lines(lines)
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return "\n".join(lines)
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def _remove_leading_spaces_from_lines(self, lines):
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# compute the indentation (leading spaces) in the docstring
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leading_spaces = 0
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for line in lines:
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line_leading_spaces = len(line) - len(line.lstrip(' '))
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if leading_spaces == 0:
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leading_spaces = line_leading_spaces
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leading_spaces = min(leading_spaces, line_leading_spaces)
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# dedent the lines (remove leading spaces)
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lines = [line[leading_spaces:] for line in lines]
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return lines
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def create_argparser(self):
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"""
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Create `.argparser` and `.subparsers`.
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Override this method to replace them with your own.
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"""
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self.argparser = argparse.ArgumentParser(
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usage=self.get_argparser_usage(),
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description=self._remove_leading_spaces_from_text(self.__doc__),
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formatter_class=HelpFormatter,
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)
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self.subparsers = self.argparser.add_subparsers(
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title="commands",
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dest="command",
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)
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self.pre_argparse()
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self.add_global_options(self.argparser)
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# map command name to `do_*` function that runs the command
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self.cmd_map = {}
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# map aliases back to the command names
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self.alias_to_cmd_name_map = {}
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for attr in dir(self):
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if not attr.startswith("do_"):
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continue
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cmd_name = attr[3:]
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cmd_func = getattr(self, attr)
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# extract data from the function
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cmd_name = getattr(cmd_func, "name", cmd_name)
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options = getattr(cmd_func, "options", [])
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aliases = getattr(cmd_func, "aliases", [])
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hidden = getattr(cmd_func, "hidden", False)
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# map command name and aliases to the function
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self.cmd_map[cmd_name] = cmd_func
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self.alias_to_cmd_name_map[cmd_name] = cmd_name
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for i in aliases:
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self.cmd_map[i] = cmd_func
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self.alias_to_cmd_name_map[i] = cmd_name
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if cmd_func.__doc__:
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# split doctext into lines, allow the first line to start at a new line
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help_lines = cmd_func.__doc__.lstrip().splitlines()
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# use the first line as help text
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help_text = help_lines.pop(0)
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# use the remaining lines as description
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help_lines = self._remove_leading_spaces_from_lines(help_lines)
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help_desc = "\n".join(help_lines)
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help_desc = help_desc.strip()
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else:
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help_text = ""
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help_desc = ""
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if hidden:
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help_text = argparse.SUPPRESS
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subparser = self.subparsers.add_parser(
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cmd_name,
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aliases=aliases,
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help=help_text,
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description=help_desc,
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prog=self.get_subcommand_prog(cmd_name),
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formatter_class=HelpFormatter,
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conflict_handler="resolve",
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)
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# add hidden copy of global options so they can be used in any place
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self.add_global_options(subparser, suppress=True)
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# add sub-command options, overriding hidden copies of global options if needed (due to conflict_handler="resolve")
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for option_args, option_kwargs in options:
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subparser.add_argument(*option_args, **option_kwargs)
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def argparse_error(self, *args, **kwargs):
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"""
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Raise an argument parser error.
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Automatically pick the right parser for the main program or a subcommand.
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"""
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if not self.options.command:
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parser = self.argparser
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else:
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parser = self.subparsers._name_parser_map.get(self.options.command, self.argparser)
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parser.error(*args, **kwargs)
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def pre_argparse(self):
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"""
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Hook method executed after `.main()` creates `.argparser` instance
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and before `parse_args()` is called.
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"""
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pass
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def add_global_options(self, parser, suppress=False):
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"""
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Add options to the main argument parser and all subparsers.
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"""
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pass
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def post_argparse(self):
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"""
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Hook method executed after `.main()` calls `parse_args()`.
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When called, `.options` and `.args` hold the results of `parse_args()`.
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"""
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pass
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def main(self, argv=None):
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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.create_argparser()
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self.options, self.args = self.argparser.parse_known_args(argv[1:])
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unrecognized = [i for i in self.args if i.startswith("-")]
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if unrecognized:
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self.argparser.error(f"unrecognized arguments: {' '.join(unrecognized)}")
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self.post_argparse()
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if not self.options.command:
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self.argparser.error("Please specify a command")
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# find the `do_*` function to call by its name
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cmd = self.cmd_map[self.options.command]
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# run the command with parsed args
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sig = inspect.signature(cmd)
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arg_names = list(sig.parameters.keys())
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if arg_names == ["subcmd", "opts"]:
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# positional args specified manually via @cmdln.option
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if self.args:
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self.argparser.error(f"unrecognized arguments: {' '.join(self.args)}")
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cmd(self.options.command, self.options)
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elif arg_names == ["subcmd", "opts", "args"]:
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# positional args are the remaining (unrecognized) args
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cmd(self.options.command, self.options, *self.args)
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else:
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# positional args are the remaining (unrecongnized) args
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# and the do_* handler takes other arguments than "subcmd", "opts", "args"
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import warnings
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warnings.warn(
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f"do_{self.options.command}() handler has deprecated signature. "
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f"It takes the following args: {arg_names}, while it should be taking ['subcmd', 'opts'] "
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f"and handling positional arguments explicitly via @cmdln.option.",
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FutureWarning
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)
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try:
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cmd(self.options.command, self.options, *self.args)
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except TypeError as e:
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if e.args[0].startswith("do_"):
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sys.exit(str(e))
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raise
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@alias("?")
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def do_help(self, subcmd, opts, *args):
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"""
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Give detailed help on a specific sub-command
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usage:
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%(prog)s [SUBCOMMAND]
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"""
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if not args:
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self.argparser.print_help()
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return
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for action in self.argparser._actions:
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if not isinstance(action, argparse._SubParsersAction):
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continue
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for choice, subparser in action.choices.items():
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if choice == args[0]:
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subparser.print_help()
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return
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