#!/bin/sh
#
# Generate a release tarball
#
# Copyright 2024 Stephen M. Webb  <stephen.webb@bregmasoft.ca>
#
# This file is a part of the libunwind project.
#
# 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:
#
# 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.
#

progname="$0"
start_dir="$(pwd)"
src_dir="${start_dir}"
keep_working_dir=n
ext_list="gzip"
valid_exts="gzip bzip2 xz zip"

print_usage()
{
    printf "usage: %s: OPTIONS\n" "$progname"
    printf "   Roll source release tarballs\n\n"
    printf "   -h, --help        print this message and exit\n"
    printf "   -k, --keep        do not delete temporary working directory\n"
    printf "   -s, --source      location of source directory [current working direcctory]\n"
    printf "   -x, --extensions  list of tarball compression types [gzip]\n"
    printf "                     valid extension are the following: %s\n" "$valid_exts"
}

do_cleanup()
{
    cd "$start_dir"
    if [ $keep_working_dir != y ]; then
        rm -rf "$working_dir"
    fi
}

validate_extensions()
{
    for valid_ext in $valid_exts; do
        if [ "$1" = "$valid_ext" ]; then
            return 1
        fi
    done
    return 0
}

do_setup()
{
    options=$(getopt --options='hks:x:' \
                     --longoptions='help,keep,source:extensions:' \
                     --name "$progname" \
                     -- "$@")
    if [ $? -ne 0 ]; then
        print_usage
        exit 1
    fi

    eval set -- "$options"
    while true; do
        case "$1" in
            -h|--help)
                print_usage
                exit 0
                ;;
            -k|--keep)
                keep_working_dir=y
                shift
                ;;
            -s|--source)
                src_dir=$(readlink -f "$2")
                shift 2
                ;;
            -x|--extensions)
                for ext in $2; do
                    if validate_extensions $ext; then
                        printf "invalid extension %s" "$ext\n"
                        print_usage
                        exit 1
                    fi
                done
                ext_list="$2"
                shift 2
                ;;
            --)
                shift
                break
                ;;
            *)
                print_usage
                exit 1
                ;;
        esac
    done

    working_dir=$(mktemp -p "${start_dir}" -d)
    trap do_cleanup 0
}

#
# Regenerate the autotools files and update the config scripts to the latest
# upstream
#
do_source_updates()
{
    upstream_url='https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain'

    cd "${src_dir}"
    autoreconf -if
    wget -O config/config.guess "${upstream_url};f=config.guess;hb=HEAD"
    wget -O config/config.sub "${upstream_url};f=config.sub;hb=HEAD"
}

#
# Generate the tarball(s)
#
do_tarball()
{
    cd "${working_dir}"
    "${src_dir}/configure"

    cd "$working_dir"
    for ext in $ext_list; do
        make dist-${ext}
    done

    for cmp in $ext_list; do
        case $cmp in
            gzip)
                ext=tar.gz
                ;;
            bzip2)
                ext=tar.bz2
                ;;
            xz)
                ext=tar.xz
                ;;
            zip)
                ext=zip
                ;;
            *)
                printf "unknown extension: %s\n" "$cmp"
                ;;
        esac
        mv *.${ext} "$start_dir"
    done
}


do_setup "$@"
do_source_updates
do_tarball