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#!/usr/bin/env bash
set -o errexit -o pipefail -o posix
# Copyright (c) 2019-2025 Cosmin Truta.
#
# Use, modification and distribution are subject to the MIT License.
# Please see the accompanying file LICENSE_MIT.txt
#
# SPDX-License-Identifier: MIT
# shellcheck source=ci/lib/ci.lib.sh
source "$(dirname "$0")/../lib/ci.lib.sh"
function ci_shellify_autoconf {
# Convert autoconf (M4) text, specifically originating
# from configure.ac, to shell scripting text.
# Select only the easy-to-parse definitions of PNGLIB_*.
sed -n -e '/^ *PNGLIB_[^ ]*=[$"0-9A-Za-z_]/ p' |
sed -e 's/^ *PNG\([0-9A-Za-z_]*\)=\([^# ]*\).*$/PNG\1=\2/' \
-e 's/^\([^ ]*=[^ ]*\).*$/export \1;/'
}
function usage {
echo "usage: $CI_SCRIPT_NAME [<options>] configure.ac"
echo "options: -?|-h|--help"
exit "${@:-0}"
}
function main {
local opt
while getopts ":" opt
do
# This ain't a while-loop. It only pretends to be.
[[ $1 == -[?h]* || $1 == --help || $1 == --help=* ]] && usage 0
ci_err "unknown option: '$1'"
done
shift $((OPTIND - 1))
[[ $# -eq 0 ]] && usage 2
[[ $# -eq 1 ]] || ci_err "too many operands"
# And... go!
test -e "$1" || ci_err "no such file: '$1'"
[[ $(basename -- "$1") == configure.ac ]] || {
ci_err "incorrect operand: '$1' (expecting: 'configure.ac')"
}
ci_shellify_autoconf <"$1"
}
main "$@"
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