make-wrappers.sh

#! /bin/sh
# Copyright (c) 2020, 2022 Dennis Wölfing
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

set -e
compress=${1?"missing operand"}
shift

for wrapper; do
    case $wrapper in
    uncompress) flags="-d" ;;
    zcat) flags="-cd" ;;
    gzip) flags="-g" ;;
    gunzip) flags="-dg" ;;
    xz) flags="-m xz" ;;
    unxz) flags="-d -m xz" ;;
    xzcat) flags="-cd -m xz" ;;
    *)
        echo "Unknown wrapper script: $wrapper"
        exit 1
    esac

    cat > $wrapper << EOF
#! /bin/sh
'$compress' --argv0="\$0" $flags "\$@"
EOF
done