system/asciidoctor: pull in for git

system/asciidoctor/APKBUILD

+# Contributor: Seung Soo Mun <hamletmun@gmail.com>
+# Maintainer: A. Wilcox <awilfox@adelielinux.org>
+pkgname=asciidoctor
+pkgver=1.5.7.1
+pkgrel=0
+pkgdesc="A text processor for converting AsciiDoc markup into HTML 5, DocBook 4.5 and other formats"
+url="https://rubygems.org/gems/$pkgname"
+arch="noarch"
+options="!check"  # can't test in this packaging format; package differently
+license="MIT"
+depends="ruby"
+source="http://gems.rubyforge.org/gems/$pkgname-$pkgver.gem"
+
+package() {
+	local gemdir="$(ruby -e 'puts Gem.default_dir')"
+
+	gem install \
+		--local \
+		--install-dir "$pkgdir"/$gemdir \
+		--ignore-dependencies \
+		--verbose \
+		--no-document \
+		"$srcdir"/$pkgname-$pkgver.gem
+
+	rm -rf "$pkgdir"/$gemdir/cache
+
+	cd "$pkgdir"
+	local i; for i in usr/lib/ruby/gems/*/bin/*; do
+		if [ -e "$i" ]; then
+			mkdir -p "$pkgdir"/usr/bin
+			ln -s /$i "$pkgdir"/usr/bin/
+		fi
+	done
+}
+
+sha512sums="104a320cd2efdb1d01bd3a0a4a144d9946a668a7d7e57d61cba3e424abd73a3fa0c4840ab7719e556d077a943301ef67b5464f1b69bdf6a79eade293d54e9bdc  asciidoctor-1.5.7.1.gem"