dev-embedded/arduino-builder: add package

This package is needed for the bump to dev-embedded/arduino to 1.8.5.

Mostly based on maurerpe's fine work at
https://github.com/maurerpe/arduino-overlay/tree/master/dev-embedded/arduino-builder
but with a "vendor" approach to golang dependencies.

Bug: https://bugs.gentoo.org/525882
Package-Manager: Portage-2.3.19, Repoman-2.3.6

dev-embedded/arduino-builder/Manifest

@@ -0,0 +1,4 @@
+DIST arduino-builder-1.3.25.tar.gz 206905 BLAKE2B 6770b89607c1563b68a79d34e6e214586106c63a4b3c854b4f85a4b9eb2fc24ce5d4a97c29b0c05c19b6834e103f3c3c574bd8cefed0eb684d8aab7e4c71ee7f SHA512 3740530800f8a3cfe1fe20a91579e6b632b76c2c4ace68c7b178a2d234032d5887abee3d0360c3039f2fec912a0d5cabe948bf930a7d9ea23221625456ad5357
+DIST github.com-go-errors-errors-a41850380601eeb43f4350f7d17c6bbd8944aaf8.tar.gz 7835 BLAKE2B f4092b4ef5ebf996cb3c20183868dbdd154ea7cf02a4fd5a3375a3193e9ccacad08f0b6681b456786524b729ffb8c0b5c8af6ceec630eec22326d0fe1e00eb22 SHA512 b1d5e7c6f30f94f8a41b10d32b7f4ce7de8394f74ede6c14fb1f267a0514b24bc3bc7659c3baf6eacf424cea8451e7e57f5f72acc568342e90a447bd02f3e262
+DIST github.com-jstemmer-go-junit-report-833f8ea2b99d36d5f018698333834f3df200a0c2.tar.gz 6901 BLAKE2B 6138ac40810ad000a4336ffbca3bc5c1d0e96854c7918fb2aad9f7b2596ac66f285ac8c519e30b6e97cdb0009b31ab73b83ff2e1db2f464c2d88f2c1045a6bd9 SHA512 00f38f51c5f761b5a3e60a6e6b602f1246a746f081f2d8946d01387234270544692c6af54d0e69919c1af8aa753f848eeecc4421f2ddf881f21522ccf5545d75
+DIST github.com-stretchr-testify-1661650f989674e3e5bcdcb805536e5d31481526.tar.gz 81099 BLAKE2B 592a7c114b01bc5b1982135f310aa8619c2888ac36ccb5d876a38655a13f7dc4d468a7a42a44cf9cf69fc7bd6769a9ba010b48089d5ce866dcd564e20487e04a SHA512 f10255b0f47237c7583626a3bb213ca67d0db92c2a1531cc31dac089cdb13139b01647809503313a26f3e53a64a98cebc3bf9c4e1bd1ed975d9b81aa516ab5af

dev-embedded/arduino-builder/arduino-builder-1.3.25.ebuild

@@ -0,0 +1,79 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+EGO_PN="arduino.cc/arduino-builder/..."
+
+EGO_VENDOR=(
+	"github.com/go-errors/errors a41850380601eeb43f4350f7d17c6bbd8944aaf8"
+	"github.com/jstemmer/go-junit-report 833f8ea2b99d36d5f018698333834f3df200a0c2"
+	"github.com/stretchr/testify 1661650f989674e3e5bcdcb805536e5d31481526"
+)
+
+inherit golang-build golang-vcs-snapshot
+
+DESCRIPTION="A command line tool for compiling Arduino sketches"
+HOMEPAGE="https://github.com/arduino/arduino-builder"
+SRC_URI="https://github.com/arduino/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz
+	${EGO_VENDOR_URI}"
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+RDEPEND="sys-devel/crossdev
+	dev-embedded/avrdude
+	dev-embedded/arduino-ctags"
+
+DEPEND=">=dev-lang/go-1.9.2"
+
+src_unpack() {
+	golang-vcs-snapshot_src_unpack
+}
+
+src_prepare() {
+	# As we know, golang packages have to be compiled from namespace-aware paths which is the whole
+	# point of the EGO_PN dance. arduino-builder goes a step further by re-creating its own
+	# namespace inside its source package, messing up with our build process which can't find
+	# packages. Also, our source package contains multiple namespaces which further messes with
+	# messes with our vendoring process (each namespace needs its own vendor directory).
+	# We do the following to try to work around this mess. It looks like upstream reworked this
+	# in its master branch so we should be able to remove this in the upcoming major release.
+
+	local deeppath="${S}/src/${EGO_PN%/...}"
+	for pkgname in builder properties timeutils; do
+		ln -s "${deeppath}/src/arduino.cc/${pkgname}" "${S}/src/arduino.cc/${pkgname}"
+	done
+	ln -s "${deeppath}/vendor/github.com" "${S}/src/github.com"
+
+	# path paths so that they point to system ctags and avrdude
+	eapply "${FILESDIR}/arduino-builder-1.3.25-platform-paths.patch"
+
+	default
+}
+
+src_install() {
+	# we unfortunately have to copy/paste the contents of golang-build_src_install() here because
+	# we *don't* want to call golang_install_pkgs() which installs all static libraries we've
+	# built. All we want is to install the final executable.
+
+	set -- env GOPATH="${WORKDIR}/${P}:$(get_golibdir_gopath)" \
+		go install -v -work -x ${EGO_BUILD_FLAGS} "${EGO_PN}"
+	echo "$@"
+	"$@" || die
+
+	# END OF COPY/PASTE
+
+	dobin bin/arduino-builder
+
+	# In addition to the binary, we also want to install these two files below. They are needed by
+	# the dev-embedded/arduino which copies those files in its "hardware" folder.
+	insinto "/usr/share/${PN}"
+	cd "src/arduino.cc/builder/hardware" || die
+	doins "platform.txt"
+	doins "platform.keys.rewrite.txt"
+}
+
+pkg_postinst() {
+	[ ! -x /usr/bin/avr-gcc ] && ewarn "Missing avr-gcc; you need to crossdev -s4 avr"
+}

dev-embedded/arduino-builder/files/arduino-builder-1.3.25-platform-paths.patch

@@ -0,0 +1,19 @@
+diff --git a/src/arduino.cc/builder/hardware/platform.txt b/src/arduino.cc/builder/hardware/platform.txt
+index ca8df1f..17ce03f 100644
+--- a/src/arduino.cc/arduino-builder/src/arduino.cc/builder/hardware/platform.txt
++++ b/src/arduino.cc/arduino-builder/src/arduino.cc/builder/hardware/platform.txt
+@@ -1,11 +1,11 @@
+ # ctags
+ # ------------------------------
+-tools.ctags.path={runtime.tools.ctags.path}
+-tools.ctags.cmd.path={path}/ctags
++tools.ctags.path=/usr/bin
++tools.ctags.cmd.path={path}/arduino-ctags
+ tools.ctags.pattern="{cmd.path}" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "{source_file}"
+
+ # additional entries
+-tools.avrdude.path={runtime.tools.avrdude.path}
++tools.avrdude.path=/usr/bin
+
+ preproc.macros.flags=-w -x c++ -E -CC
+ #preproc.macros.compatibility_flags={build.mbed_api_include} {build.nRF51822_api_include} {build.ble_api_include} {compiler.libsam.c.flags} {compiler.arm.cmsis.path} {build.variant_system_include}

dev-embedded/arduino-builder/metadata.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>[email protected]</email>
+		<name>Embedded Gentoo</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">arduino/arduino-builder</remote-id>
+	</upstream>
+</pkgmetadata>