Exit Code is 1 for Help

[davidmargolis]

Since calling python my_script.py --help return an exit code of 0, shouldn't calling bash my_script.sh --help also return an exit code of 0. Currently, it is documented in the project that an exit of code of 1 will be returned, but I think it should be 0 based on this.

[davidmargolis]

Perhaps this code would solve this issue:

#!/usr/bin/env bash

# Use python's argparse module in shell scripts
#
# The function `argparse` parses its arguments using
# argparse.ArgumentParser; the parser is defined in the function's
# stdin.
#
# Executing ``argparse.bash`` (as opposed to sourcing it) prints a
# script template.
#
# https://github.com/nhoffman/argparse-bash
# MIT License - Copyright (c) 2015 Noah Hoffman

argparse(){
    argparser=$(mktemp 2>/dev/null || mktemp -t argparser)
    cat > "$argparser" <<EOF
from __future__ import print_function
import sys
import argparse
import os

parser = argparse.ArgumentParser(prog=os.path.basename("$0"),
            description="""$ARGPARSE_DESCRIPTION""")
EOF

    # stdin to this function should contain the parser definition
    cat >> "$argparser"

    cat >> "$argparser" <<EOF
args = parser.parse_args()
for arg in [a for a in dir(args) if not a.startswith('_')]:
    key = arg.upper()
    value = getattr(args, arg, None)

    if isinstance(value, bool) or value is None:
        print('{0}="{1}";'.format(key, 'yes' if value else ''))
    elif isinstance(value, list):
        print('{0}=({1});'.format(key, ' '.join('"{0}"'.format(s) for s in value)))
    else:
        print('{0}="{1}";'.format(key, value))
    sys.exit(1)
EOF

    # Define variables corresponding to the options if the args can be
    # parsed without errors; otherwise, print the text of the error
    # message.
    if python "$argparser" "$@" &> /dev/null; then
        python "$argparser" "$@"
    else
        eval "$(python "$argparser" "$@")"
    fi

    rm "$argparser"
    return 0
}

# print a script template when this script is executed
if [[ $0 == *argparse.bash ]]; then
    cat <<FOO
#!/usr/bin/env bash

source \$(dirname \$0)/argparse.bash || exit 1
argparse "\$@" <<EOF || exit 1
parser.add_argument('infile')
parser.add_argument('-o', '--outfile')

EOF

echo "INFILE: \${INFILE}"
echo "OUTFILE: \${OUTFILE}"
FOO
fi

[davidmargolis]

15 would also be solved by the above code