mix.eclass: New eclass, used by www-apps/pleroma

Signed-off-by: Haelwenn (lanodan) Monnier <contact@hacktivis.me>

eclass/mix.eclass

@@ -0,0 +1,95 @@
+# Copyright 2019-2023 Haelwenn (lanodan) Monnier <contact@hacktivis.me>
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: mix.eclass
+# @MAINTAINER:
+# Haelwenn (lanodan) Monnier <contact@hacktivis.me>
+# @AUTHOR:
+# Haelwenn (lanodan) Monnier <contact@hacktivis.me>
+# @SUPPORTED_EAPIS: 6 7 8
+# @BLURB: Build Elixir projects using Elixir's mix
+# @DESCRIPTION:
+# An eclass providing functions to build Elixir projects using Elixir's mix
+#
+# mix is a tool which tries to resolve dependencies itself
+
+case "${EAPI:-0}" in
+	0|1|2|3|4|5)
+		die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
+		;;
+	6|7)
+		;;
+	*)
+		die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
+		;;
+esac
+
+EXPORT_FUNCTIONS src_prepare src_compile src_install
+
+RDEPEND="dev-lang/elixir"
+DEPEND="${RDEPEND}"
+
+# Erlang/Elixir software fails to build when another version with API 
+# differences is present
+BDEPEND="!<${CATEGORY}/${P} !>${CATEGORY}/${P}"
+
+# @ECLASS-VARIABLE: HEX_OFFLINE
+HEX_OFFLINE=1
+
+# @ECLASS-VARIABLE: MIX_ENV
+MIX_ENV="prod"
+
+# @ECLASS-VARIABLE: MIX_NO_DEPS
+MIX_NO_DEPS=1
+
+# @FUNCTION: emix
+# @USAGE: <targets>
+# @DESCRIPTION:
+# Run mix with provided arguments. Die on failure
+emix() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	(( $# > 0 )) || die "emix: at least one target is required"
+
+	MIX_ENV="${MIX_ENV}" mix "$@" || die -n "mix $@ failed"
+}
+
+# @ECLASS-VARIABLE: MIX_REWRITE
+MIX_REWRITE=""
+
+# @ECLASS-VARIABLE: MIX_BUILD_NAME
+MIX_BUILD_NAME="${MIX_ENV}"
+
+# @FUNCTION: mix_src_prepare
+mix_src_prepare() {
+	if [[ "${MIX_REWRITE}" != "" ]]
+	then
+		sed -i -E -e 's@\{.*(only|optional): .*},?@@' mix.exs || die "failed removing only & optionnal deps"
+		rm -f mix.lock
+	fi
+
+	default
+}
+
+# @FUNCTION: mix_src_compile
+# @DESCRIPTION:
+# Compile project with mix.
+mix_src_compile() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	emix compile --no-deps-check
+}
+
+# @FUNCTION: mix_src_install
+# @DESCRIPTION:
+# Install project with mix.
+mix_src_install() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	insinto "/usr/$(get_libdir)/elixir/lib/${P}"
+	pushd "_build/${MIX_BUILD_NAME}/lib/${PN}" >/dev/null
+	for reldir in src ebin priv include; do
+		[ -d "$reldir" ] && doins -r "$(realpath ${reldir})"
+	done
+	popd >/dev/null
+}