# Copyright 1999-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: mono-pkg-config.eclass
# @MAINTAINER: dotnet@gentoo.org
# @BLURB: functions for registring in gac
# @DESCRIPTION:
# interacts with pkg-config tools

case ${EAPI:-0} in
	0|1|2|3|4|5) die "this eclass doesn't support EAPI ${EAPI:-0}" ;;
	6) ;;
esac

IUSE+=" pkg-config"

DEPEND+=" virtual/pkgconfig"

# http://www.gossamer-threads.com/lists/gentoo/dev/263462
# pkg config files should always come from upstream
# but what if they are not?
# you can fork, or you can use a configuration system that upstream actually supports.
# both are more difficult than creating .pc in ebuilds. Forks requires maintenance, and 
# second one requires rewriting the IDE (disrespecting the decision of IDE's authors who decide to use .pc-files)
# So, "keep fighting the good fight, don't stop believing, and let the haters hate" (q) desultory from #gentoo-dev-help @ freenode

# @FUNCTION: einstall_pc_file
# @DESCRIPTION:  installs .pc file
# The file format contains predefined metadata keywords and freeform variables (like ${prefix} and ${exec_prefix})
# $1 = name of package (in terms of pkg-config utility)
# $2 = ${PV}
# $3 = myassembly1 # path and filename with extension of the first .dll
# $4 = myassembly2 # path and filename with extension of the second .dll
# $N = myassemblyN-2 # see DLL_REFERENCES
einstall_pc_file()
{
	# space between "!" and "use" is necessary (bash will say "!use: command not found" otherwise)
	if ! use pkg-config; then
		return 0;
	fi

	if [ ! -v PC_DESCRIPTION ]; then
		PC_DESCRIPTION="${DESCRIPTION}"
	fi
	local HASH='\\#'
	local ESCAPED_DESCRIPTION="${PC_DESCRIPTION//#/${HASH}}"
	PC_DESCRIPTION=${ESCAPED_DESCRIPTION}
	einfo "PC_DESCRIPTION=${PC_DESCRIPTION}"

	if [ ! -v PC_NAME ]; then
		PC_NAME="$1"
	fi
	einfo "PC_NAME=${PC_NAME}"

	if [  ! -v PC_VERSION ]; then
		PC_VERSION="$2"
	fi
	einfo "PC_VERSION=${PC_VERSION}"

	shift 2

	# keep verbatim, do not change it to "/usr/$(get_libdir)/pkgconfig"
	local PC_DIRECTORY="/usr/share/pkgconfig"

	local PC_FILENAME="${PC_NAME}-${PC_VERSION}"
	local PC_FILENAME_EXT="${PC_FILENAME}.pc"

	if [ "$#" == "0" ]; then
		die "no assembly names given"
	fi
	local DLL_REFERENCES=""
	while (( "$#" )); do
		DLL_REFERENCES+=" -r:${1}"
		shift
	done

	dodir "${PC_DIRECTORY}"

	ebegin "Installing ${PC_FILENAME_EXT} file"

	# @Name@: A human-readable name for the library or package. This does not affect usage of the pkg-config tool,
	# which uses the name of the .pc file.
	# see https://people.freedesktop.org/~dbn/pkg-config-guide.html

	# \${name} variables going directly into .pc file after unescaping $ sign
	#
	# other variables are not substituted to sed input directly
	# to protect them from processing by bash
	# (they only requires sed escaping for replacement path)
	sed \
		-e "s:@PC_VERSION@:${PC_VERSION}:" \
		-e "s:@Name@:${PC_NAME}:" \
		-e "s^@DESCRIPTION@^${PC_DESCRIPTION}^" \
		-e "s:@LIBDIR@:$(get_libdir):" \
		-e "s*@LIBS@*${DLL_REFERENCES}*" \
		<<-EOF >"${D}/${PC_DIRECTORY}/${PC_FILENAME_EXT}" || die
			prefix=\${pcfiledir}/../..
			exec_prefix=\${prefix}
			libdir=\${exec_prefix}/@LIBDIR@
			Version: @PC_VERSION@
			Name: @Name@
			Description: @DESCRIPTION@
			Libs: @LIBS@
		EOF

	einfo PKG_CONFIG_PATH="${D}/${PC_DIRECTORY}" pkg-config --exists "${PC_FILENAME}"
	PKG_CONFIG_PATH="${D}/${PC_DIRECTORY}" pkg-config --exists "${PC_FILENAME}" || die ".pc file failed to validate."
	eend $?
}