Add update-script

update_version.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+set -euxo pipefail
+
+PKG=$(awk -F '=' '/^pkgname=/{ print $2 }' PKGBUILD)
+
+# Get latest version
+VER=$(git ls-remote --tags --sort -v:refname https://github.com/mvdan/gofumpt.git |
+	head -n1 |
+	grep -Eo '[0-9.]+$')
+
+# Insert latest version into PKGBUILD and update hashes
+sed -i \
+	-e "s/^pkgver=.*/pkgver=${VER}/" \
+	-e 's/pkgrel=.*/pkgrel=1/' \
+	PKGBUILD
+
+# Check whether this changed anything
+if (git diff --exit-code PKGBUILD); then
+	echo "Package ${PKG} has most recent version ${VER}"
+	exit 0
+fi
+
+updpkgsums
+
+# Update .SRCINFO
+makepkg --printsrcinfo >.SRCINFO
+
+# Commit changes
+git add PKGBUILD .SRCINFO
+git commit -m "${PKG} v${VER}"