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Diffstat (limited to 'examples/basic_completion.py')
-rwxr-xr-x | examples/basic_completion.py | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/examples/basic_completion.py b/examples/basic_completion.py new file mode 100755 index 00000000..e021828b --- /dev/null +++ b/examples/basic_completion.py @@ -0,0 +1,91 @@ +#!/usr/bin/env python +# coding=utf-8 +""" +A simple example demonstrating how to enable tab completion by assigning a completer function to do_* commands. +This also demonstrates capabilities of the following completer methods included with cmd2: +- delimiter_completer +- flag_based_complete (see note below) +- index_based_complete (see note below) + +flag_based_complete() and index_based_complete() are basic methods and should only be used if you are not +familiar with argparse. The recommended approach for tab completing positional tokens and flags is to use +argparse-based completion. For an example integrating tab completion with argparse, see argparse_completion.py +""" +import functools + +import cmd2 + +# List of strings used with completion functions +food_item_strs = ['Pizza', 'Ham', 'Ham Sandwich', 'Potato'] +sport_item_strs = ['Bat', 'Basket', 'Basketball', 'Football', 'Space Ball'] + +# This data is used to demonstrate delimiter_complete +file_strs = \ + [ + '/home/user/file.db', + '/home/user/file space.db', + '/home/user/another.db', + '/home/other user/maps.db', + '/home/other user/tests.db' + ] + + +class BasicCompletion(cmd2.Cmd): + def __init__(self, *args, **kwargs): + super().__init__(*args, **kwargs) + + def do_flag_based(self, statement: cmd2.Statement): + """Tab completes arguments based on a preceding flag using flag_based_complete + -f, --food [completes food items] + -s, --sport [completes sports] + -p, --path [completes local file system paths] + """ + self.poutput("Args: {}".format(statement.args)) + + def complete_flag_based(self, text, line, begidx, endidx): + """Completion function for do_flag_based""" + flag_dict = \ + { + # Tab complete food items after -f and --food flags in command line + '-f': food_item_strs, + '--food': food_item_strs, + + # Tab complete sport items after -s and --sport flags in command line + '-s': sport_item_strs, + '--sport': sport_item_strs, + + # Tab complete using path_complete function after -p and --path flags in command line + '-p': self.path_complete, + '--path': self.path_complete, + } + + return self.flag_based_complete(text, line, begidx, endidx, flag_dict=flag_dict) + + def do_index_based(self, statement: cmd2.Statement): + """Tab completes first 3 arguments using index_based_complete""" + self.poutput("Args: {}".format(statement.args)) + + def complete_index_based(self, text, line, begidx, endidx): + """Completion function for do_index_based""" + index_dict = \ + { + 1: food_item_strs, # Tab complete food items at index 1 in command line + 2: sport_item_strs, # Tab complete sport items at index 2 in command line + 3: self.path_complete, # Tab complete using path_complete function at index 3 in command line + } + + return self.index_based_complete(text, line, begidx, endidx, index_dict=index_dict) + + def do_delimiter_complete(self, statement: cmd2.Statement): + """Tab completes files from a list using delimiter_complete""" + self.poutput("Args: {}".format(statement.args)) + + # Use a partialmethod to set arguments to delimiter_complete + complete_delimiter_complete = functools.partialmethod(cmd2.Cmd.delimiter_complete, + match_against=file_strs, delimiter='/') + + +if __name__ == '__main__': + import sys + app = BasicCompletion() + sys.exit(app.cmdloop()) |