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# coding=utf-8
# flake8: noqa F821
"""
A cmd2 script that saves the help text for every command and sub-command to a file.
This is meant to be run within a cmd2 session using pyscript.
"""
import argparse
import os
import sys
from typing import List, TextIO
ASTERISKS = "********************************************************"
def get_sub_commands(parser: argparse.ArgumentParser) -> List[str]:
"""Get a list of sub-commands for an ArgumentParser"""
sub_cmds = []
# Check if this is parser has sub-commands
if parser is not None and parser._subparsers is not None:
# Find the _SubParsersAction for the sub-commands of this parser
for action in parser._subparsers._actions:
if isinstance(action, argparse._SubParsersAction):
for sub_cmd, sub_cmd_parser in action.choices.items():
sub_cmds.append(sub_cmd)
# Look for nested sub-commands
for nested_sub_cmd in get_sub_commands(sub_cmd_parser):
sub_cmds.append('{} {}'.format(sub_cmd, nested_sub_cmd))
break
sub_cmds.sort()
return sub_cmds
def add_help_to_file(command: str, outfile: TextIO) -> None:
"""Write a header and help text for a command to the output file"""
header = '{}\nCOMMAND: {}\n{}\n'.format(ASTERISKS, command, ASTERISKS)
outfile.write(header)
result = app('help {}'.format(command))
outfile.write(result.stdout)
def main() -> None:
"""Main function of this script"""
# Make sure we have access to self
if 'self' not in globals():
print("Run 'set locals_in_py true' and then rerun this script")
return
# Make sure the user passed in an output file
if len(sys.argv) != 2:
print("Usage: {} <output_file>".format(os.path.basename(sys.argv[0])))
return
# Open the output file
outfile_path = os.path.expanduser(sys.argv[1])
try:
outfile = open(outfile_path, 'w')
except OSError as e:
print("Error opening {} because: {}".format(outfile_path, e))
return
# Get a list of all commands and help topics and then filter out duplicates
to_save = list(set(self.get_all_commands()) | set(self.get_help_topics()))
to_save.sort()
for item in to_save:
add_help_to_file(item, outfile)
# Add any sub-commands
for subcmd in get_sub_commands(getattr(self.cmd_func(item), 'argparser', None)):
full_cmd = '{} {}'.format(item, subcmd)
add_help_to_file(full_cmd, outfile)
outfile.close()
print("Output written to {}".format(outfile_path))
# Run main function
main()
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