diff options
Diffstat (limited to 'examples/modular_commands_main.py')
| -rw-r--r-- | examples/modular_commands_main.py | 96 |
1 files changed, 11 insertions, 85 deletions
diff --git a/examples/modular_commands_main.py b/examples/modular_commands_main.py index b698e00f..1b0ec64d 100644 --- a/examples/modular_commands_main.py +++ b/examples/modular_commands_main.py @@ -5,58 +5,13 @@ A complex example demonstrating a variety of methods to load CommandSets using a with examples of how to integrate tab completion with argparse-based commands. """ import argparse -from typing import Dict, Iterable, List, Optional +from typing import Iterable, List, Optional -from cmd2 import Cmd, Cmd2ArgumentParser, CommandSet, CompletionItem, with_argparser -from cmd2.utils import CompletionError, basic_complete from modular_commands.commandset_basic import BasicCompletionCommandSet # noqa: F401 from modular_commands.commandset_complex import CommandSetA # noqa: F401 from modular_commands.commandset_custominit import CustomInitCommandSet # noqa: F401 -# Data source for argparse.choices -food_item_strs = ['Pizza', 'Ham', 'Ham Sandwich', 'Potato'] - - -def choices_function() -> List[str]: - """Choices functions are useful when the choice list is dynamically generated (e.g. from data in a database)""" - return ['a', 'dynamic', 'list', 'goes', 'here'] - - -def completer_function(text: str, line: str, begidx: int, endidx: int) -> List[str]: - """ - A tab completion function not dependent on instance data. Since custom tab completion operations commonly - need to modify cmd2's instance variables related to tab completion, it will be rare to need a completer - function. completer_method should be used in those cases. - """ - match_against = ['a', 'dynamic', 'list', 'goes', 'here'] - return basic_complete(text, line, begidx, endidx, match_against) - - -def choices_completion_item() -> List[CompletionItem]: - """Return CompletionItem instead of strings. These give more context to what's being tab completed.""" - items = \ - { - 1: "My item", - 2: "Another item", - 3: "Yet another item" - } - return [CompletionItem(item_id, description) for item_id, description in items.items()] - - -def choices_arg_tokens(arg_tokens: Dict[str, List[str]]) -> List[str]: - """ - If a choices or completer function/method takes a value called arg_tokens, then it will be - passed a dictionary that maps the command line tokens up through the one being completed - to their argparse argument name. All values of the arg_tokens dictionary are lists, even if - a particular argument expects only 1 token. - """ - # Check if choices_function flag has appeared - values = ['choices_function', 'flag'] - if 'choices_function' in arg_tokens: - values.append('is {}'.format(arg_tokens['choices_function'][0])) - else: - values.append('not supplied') - return values +from cmd2 import Cmd, Cmd2ArgumentParser, CommandSet, with_argparser class WithCommandSets(Cmd): @@ -64,55 +19,26 @@ class WithCommandSets(Cmd): super().__init__(command_sets=command_sets) self.sport_item_strs = ['Bat', 'Basket', 'Basketball', 'Football', 'Space Ball'] - def choices_method(self) -> List[str]: - """Choices methods are useful when the choice list is based on instance data of your application""" + def choices_provider(self) -> List[str]: + """A choices provider is useful when the choice list is based on instance data of your application""" return self.sport_item_strs - def choices_completion_error(self) -> List[str]: - """ - CompletionErrors can be raised if an error occurs while tab completing. - - Example use cases - - Reading a database to retrieve a tab completion data set failed - - A previous command line argument that determines the data set being completed is invalid - """ - if self.debug: - return self.sport_item_strs - raise CompletionError("debug must be true") - # Parser for example command example_parser = Cmd2ArgumentParser(description="Command demonstrating tab completion with argparse\n" "Notice even the flags of this command tab complete") # Tab complete from a list using argparse choices. Set metavar if you don't # want the entire choices list showing in the usage text for this command. - example_parser.add_argument('--choices', choices=food_item_strs, metavar="CHOICE", + example_parser.add_argument('--choices', choices=['some', 'choices', 'here'], metavar="CHOICE", help="tab complete using choices") - # Tab complete from choices provided by a choices function and choices method - example_parser.add_argument('--choices_function', choices_function=choices_function, - help="tab complete using a choices_function") - example_parser.add_argument('--choices_method', choices_method=choices_method, - help="tab complete using a choices_method") - - # Tab complete using a completer function and completer method - example_parser.add_argument('--completer_function', completer_function=completer_function, - help="tab complete using a completer_function") - example_parser.add_argument('--completer_method', completer_method=Cmd.path_complete, - help="tab complete using a completer_method") - - # Demonstrate raising a CompletionError while tab completing - example_parser.add_argument('--completion_error', choices_method=choices_completion_error, - help="raise a CompletionError while tab completing if debug is False") - - # Demonstrate returning CompletionItems instead of strings - example_parser.add_argument('--completion_item', choices_function=choices_completion_item, metavar="ITEM_ID", - descriptive_header="Description", - help="demonstrate use of CompletionItems") + # Tab complete from choices provided by a choices provider + example_parser.add_argument('--choices_provider', choices_provider=choices_provider, + help="tab complete using a choices_provider") - # Demonstrate use of arg_tokens dictionary - example_parser.add_argument('--arg_tokens', choices_function=choices_arg_tokens, - help="demonstrate use of arg_tokens dictionary") + # Tab complete using a completer + example_parser.add_argument('--completer', completer=Cmd.path_complete, + help="tab complete using a completer") @with_argparser(example_parser) def do_example(self, _: argparse.Namespace) -> None: |