abuild: add maintainer info to .PKGBUILD

We can either set maintainer="..." in APKBUILD or use it as comment.

abuild.in

@@ -459,6 +459,12 @@ git_last_commit() {
 	git log --format=oneline -n 1 "$startdir" | awk '{print $1}'
 }
 
+get_maintainer() {
+	if [ -z "$maintainer" ]; then
+		maintainer=$(awk -F': ' '/\# *Maintainer/ {print $2}' "$APKBUILD")
+	fi
+}
+
 prepare_metafiles() {
 	getpkgver || return 1
 	local name=${subpkgname:-$pkgname}
@@ -492,7 +498,6 @@ builddate = $builddate
 packager = ${PACKAGER:-"Unknown"}
 size = $size
 arch = $parch
-commit = $(git_last_commit)$(git_dirty)
 EOF
 	local i deps
 	deps="$depends"
@@ -506,6 +511,16 @@ EOF
 		done
 	fi
 	
+	local last_commit="$(git_last_commit)$(git_dirty)"
+	if [ -n "$last_commit" ]; then
+		echo "commit = $last_commit" >> "$pkginfo"
+	fi
+
+	get_maintainer
+	if [ -n "$maintainer" ]; then
+		echo "maintainer = $maintainer" >> "$pkginfo"
+	fi
+
 	for i in $license; do
 		echo "license = $i" >> "$pkginfo"
 	done