Python argument parsing for bash scripts

py-args-for-bash.sh

#!/bin/sh

# MIT No Attribution
#
# Copyright 2020 Ben Kehoe
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify,
# merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

VARS=$(python3 - "$@" << EOF
import argparse
import shlex
parser = argparse.ArgumentParser(prog="$0")

# Add arguments here
# parser.add_argument('--foo-bar')

args = parser.parse_args()
for k, v in vars(args).items():
    print("{}={}".format(k, shlex.quote(str(v))))
EOF
)
if echo "$VARS" | grep -q "^usage:"; then
  echo "$VARS"
  exit 1
fi
eval $VARS

# use arguments here
# echo "$foo_bar"