#!/bin/sh

set -eu

# prefix, exec_prefix

if [ "$PKGCONF_PREFIX" = "$PKGCONF_EXEC_PREFIX" ]; then

	pkgconf_prefix="${PKGCONF_PREFIX}"

	pkgconf_exec_prefix='${prefix}'

else

	pkgconf_prefix="${PKGCONF_PREFIX}"

	pkgconf_exec_prefix="${PKGCONF_EXEC_PREFIX}"

fi

# (relative) includedir

if [ -z "$PKGCONF_INCLUDEDIR" ]; then

	pkgconf_includedir=

	pkgconf_cflags=

else

	prefix=$(dirname "$PKGCONF_INCLUDEDIR")

	base=$(basename "$PKGCONF_INCLUDEDIR")

	if [ "$prefix/$base" = "$PKGCONF_PREFIX/$base" ]; then

		pkgconf_includedir='${prefix}/'"${base}"

		pkgconf_cflags='-I${includedir}'

	else

		pkgconf_includedir="${PKGCONF_INCLUDEDIR}"

		pkgconf_cflags='-I${includedir}'

	fi

fi

# (relative) libdir (blank unless needed)

if [ -z "$PKGCONF_LIBDIR" ]; then

	pkgconf_libdir=

else

	prefix=$(dirname "$PKGCONF_LIBDIR")

	base=$(basename "$PKGCONF_LIBDIR")

	if [ "$prefix/$base" = "$PKGCONF_EXEC_PREFIX/$base" ]; then

		pkgconf_libdir='${exec_prefix}/'"${base}"

	else

		pkgconf_libdir='${prefix}/'"${PKGCONF_LIBDIR}"

	fi

fi

# ldflags (--libs)

if [ -n "$pkgconf_libdir" ] &&  [ -n "${PKGCONF_NAME}" ]; then

	pkgconf_ldflags="$pkgconf_libdir -l${PKGCONF_NAME}"

elif [ -n "${PKGCONF_NAME}" ]; then

	pkgconf_ldflags="-l${PKGCONF_NAME}"

else

	pkgconf_ldflags="$pkgconf_libdir"

fi

# cflags

if [ -n "$pkgconf_cflags" ] || [ -n "${PKGCONF_DEFS}" ]; then

	pkgconf_cflags="$pkgconf_cflags ${PKGCONF_DEFS}"

	pkgconf_cflags=$(printf '%s' "$pkgconf_cflags" | sed -e 's/^[ \t]*//g')

fi

# repo (optional)

if [ -z "${PKGCONF_REPO}" ]; then

	pkgconf_repo='#'

else

	pkgconf_repo="Repo:        ${PKGCONF_REPO}"

fi

# patches (optional)

if [ -z "${PKGCONF_PSRC}" ]; then

	pkgconf_psrc='#'

else

	pkgconf_psrc="Patches:     ${PKGCONF_PSRC}"

fi

# distro (optional)

if [ -z "${PKGCONF_DURL}" ]; then

	pkgconf_durl='#'

else

	pkgconf_durl="Distro:      ${PKGCONF_DURL}"

fi

# output (without trailing spaces)

cat << _EOF | grep -v '^#' | sed 's/[ \t]*$//'

###

prefix=$pkgconf_prefix

exec_prefix=$pkgconf_exec_prefix

includedir=$pkgconf_includedir

libdir=$pkgconf_libdir

Name:        ${PKGCONF_NAME}

Description: ${PKGCONF_DESC}

URL:         ${PKGCONF_USRC}

Version:     ${PKGCONF_VERSION}

$pkgconf_repo

$pkgconf_psrc

$pkgconf_durl

Cflags:      $pkgconf_cflags

Libs:        $pkgconf_ldflags

###

_EOF

# all done

exit 0