games-simulation/simutrans: make midi support optional

Closes: https://bugs.gentoo.org/913715
Signed-off-by: tastytea <gentoo@tastytea.de>
Closes: https://github.com/gentoo/gentoo/pull/32693
Signed-off-by: Viorel Munteanu <ceamac@gentoo.org>

games-simulation/simutrans/metadata.xml

@@ -15,5 +15,6 @@
 	</upstream>
 	<use>
 		<flag name="minimal">Don't install any PakSets (scenario data)</flag>
+		<flag name="midi">support for background MIDI music via <pkg>media-sound/fluidsynth</pkg></flag>
 	</use>
 </pkgmetadata>

games-simulation/simutrans/simutrans-123.0.1-r2.ebuild

@@ -0,0 +1,109 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit autotools desktop flag-o-matic optfeature toolchain-funcs xdg
+
+MY_PV=${PV//./-}
+MY_PAK_64="simupak64-123-0.zip"
+# Required for network games, published in release announcement.
+MY_SVN_REVISION="10421"
+
+DESCRIPTION="A free Transport Tycoon clone"
+HOMEPAGE="https://www.simutrans.com/"
+SRC_URI="
+	mirror://sourceforge/simutrans/simutrans-src-${MY_PV}.zip
+	!minimal? ( mirror://sourceforge/simutrans/${MY_PAK_64} -> simutrans_${MY_PAK_64} )
+	https://tastytea.de/files/simutrans_language_pack-Base+texts-${PV}.zip
+	https://github.com/aburch/simutrans/raw/9c84822/simutrans.svg
+"
+S=${WORKDIR}
+
+# NOTE: Get the latest language pack from:
+# https://simutrans-germany.com/translator/data/tab/language_pack-Base+texts.zip
+
+LICENSE="Artistic"
+SLOT="0"
+KEYWORDS="~amd64 ~arm64 ~x86"
+IUSE="minimal +midi truetype upnp zstd"
+
+DEPEND="
+	app-arch/bzip2
+	media-libs/libpng:0=
+	media-libs/libsdl2[sound,video]
+	sys-libs/zlib
+	midi? ( media-sound/fluidsynth:=[sdl] )
+	truetype? ( media-libs/freetype )
+	upnp? ( net-libs/miniupnpc:= )
+	zstd? ( app-arch/zstd )
+"
+RDEPEND="
+	${DEPEND}
+	midi? ( media-sound/fluid-soundfont )
+"
+BDEPEND="
+	app-arch/unzip
+	virtual/pkgconfig
+"
+RESTRICT="test" # Opens the program and doesn't close it.
+
+PATCHES=( "${FILESDIR}"/${PN}-123.0.1-silence-svn-and-git-errors.patch )
+
+src_unpack() {
+	unpack "simutrans-src-${MY_PV}.zip"
+	use minimal || unpack "simutrans_${MY_PAK_64}"
+
+	# Bundled text files are incomplete, bug #580948
+	cd "${S}/simutrans/text" || die
+	unpack "simutrans_language_pack-Base+texts-${PV}.zip"
+}
+
+src_prepare() {
+	default
+	xdg_environment_reset
+
+	strip-flags # bug #293927
+	append-flags -fno-strict-aliasing # bug #859229
+
+	eautoreconf
+
+	# Make it look for the data in the right directory.
+	sed -i -e "s:argv\[0\]:\"/usr/share/${PN}/\":" simmain.cc || die
+}
+
+src_configure() {
+	default
+
+	cat > config.default <<-EOF || die
+		BACKEND=sdl2
+		OSTYPE=linux
+		OPTIMISE=0
+		STATIC=0
+		MULTI_THREAD=1
+		USE_UPNP=$(usex upnp 1 0)
+		USE_FREETYPE=$(usex truetype 1 0)
+		USE_ZSTD=$(usex zstd 1 0)
+		USE_FLUIDSYNTH_MIDI=$(usex midi 1 0)
+		VERBOSE=1
+		FLAGS := -DREVISION="${MY_SVN_REVISION}"
+
+		HOSTCC = $(tc-getCC)
+		HOSTCXX = $(tc-getCXX)
+	EOF
+}
+
+src_install() {
+	newbin build/default/sim ${PN}
+	insinto usr/share/${PN}
+	doins -r simutrans/*
+	doicon "${DISTDIR}"/${PN}.svg
+	domenu "${FILESDIR}"/${PN}.desktop
+}
+
+pkg_postinst() {
+	xdg_pkg_postinst
+
+	optfeature_header "Since 123.0 this ebuild only installs the Pak64 PakSet. You can install"
+	optfeature "other PakSets" games-simulation/simutrans-paksets
+}