#!/bin/sh

# The MIT License (MIT)
#
# Copyright © 2020-2025 pacman64
#
# 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, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# 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.


# mashin [options...] [filepaths...]
#
#
# MAke SHell INstaller makes an installer which creates/updates files and
# folders. The output is shell source code which uses base64-encoded gzipped
# payloads.
#
# The options are, available both in single and double-dash versions
#
#   -d              change the destination folder with the next argument
#   -dest           change the destination folder with the next argument
#   -destination    change the destination folder with the next argument
#
#   -h              show this help message
#   -help           show this help message
#
#   -r              use filepaths relative to the destination folder
#   -rel            use filepaths relative to the destination folder
#   -relative       use filepaths relative to the destination folder
#
#   -x              make installer enable the executable bit on all results
#   -exec           make installer enable the executable bit on all results
#   -executable     make installer enable the executable bit on all results


case "$1" in
    -h|--h|-help|--help)
        awk '/^# +mashin /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
        exit 0
    ;;
esac

rel_paths=0
dest_folder='.'
make_exec=0

while true; do
    case "$1" in
        -d|--d|-dest|--dest|-destination|--destination)
            shift
            if [ $# -eq 0 ]; then
                printf "\e[38;2;204;0;0mmissing destination folder\e[0m\n" >&2
                exit 1
            fi

            dest_folder="$(echo "$1" | sed 's-//*$--')"
            if echo "${dest_folder}" | grep -q -v '^\./'; then
                if echo "${dest_folder}" | grep -q -v '^/'; then
                    dest_folder="$(echo "${dest_folder}" | sed 's-^-./-')"
                fi
            fi
            shift
        ;;

        -r|--r|-rel|--rel|-relative|--relative)
            rel_paths=1
            shift
        ;;

        -x|--x|-exec|--exec|-executable|--executable)
            make_exec=1
            shift
        ;;

        --)
            shift
            break
        ;;

        *)
            break
        ;;
    esac
done

if [ $# -eq 0 ]; then
    awk '/^# +shin /, /^$/ { gsub(/^# ?/, ""); print }' "$0" >&2
    exit 0
fi

printf "#!/bin/sh\n"

files=0

for arg in "$@"; do
    if [ ! -f "${arg}" ]; then
        printf "\e[38;2;204;0;0m'%s' isn't a file\e[0m\n" "${arg}" >&2
        exit 1
    fi

    files="$((files + 1))"

    if [ "${rel_paths}" -eq 1 ]; then
        name="$(basename ${arg} | sed -E 's-^\.?/--')"
    else
        name="$(echo ${arg} | sed -E 's-^\.?/--')"
    fi

    dest_path="$(printf "%s/%s" "${dest_folder}" "${name}")"
    folder="$(dirname "${dest_path}")"

    # dash doesn't support single-line `<<<` redirects
    printf "mkdir -p %s && { base64 -d | gzip -d; } > %s << 'EOF'\n" \
        "${folder}" "${dest_path}"
    cat "${arg}" | gzip | base64 -w 0
    printf "\nEOF\n"

    if [ "${make_exec}" -eq 1 ]; then
        printf "chmod +x %s\n" "${dest_path}"
    fi
done

if [ "${files}" -eq 0 ]; then
    printf "\e[38;2;204;0;0mno files given\e[0m\n" >&2
    exit 1
fi