a small posix sh script for updating PKGBUILDs automatically

updatepkgs.sh

#!/usr/bin/env sh
## SPDX-License-Identifier: MIT
## a small posix sh script for updating PKGBUILDs

## this uses files named `update.sh` in the same directory as a PKGBUILD
## they can be configured like this:
##
## ```
## name="foo"
## link='https://api.github.com/repos/bar/foo/releases/latest'
## jq_exp='.tag_name'
## regex='v/' # this will be run with `sed` to get the `pkgver`. in this case it only removes the 'v' prefix
## ``
##
## requires: gh, jq

# shellcheck disable=SC2154,SC1091,SC2094
set -e

origdir="$PWD"
pkgdir="$HOME/pkgbuilds/" # directory with subfolders containing PKGBUILDS

catch_err() {
	echo "$1: failed to $2"
}

# temp file to write new pkgbuilds to
tmp="$(mktemp PKGBUILD-XXXXX)"
trap 'rm -f "$tmp"' EXIT

for dir in "$pkgdir"/*/; do
	if [ ! -f "$dir"/update.sh ]; then
		continue
	fi

	. "$dir"/update.sh
	echo "updating $name..."

	latest_ver="$(gh api "$link" | jq "$jq_exp" | tr -d '"' | sed "s/$regex/" )"
	cur_ver="$(grep '^pkgver=' "$dir"/PKGBUILD | sed 's/pkgver=//')"

	[ "$latest_ver" = "$cur_ver" ] && continue
	echo "updating $name: $cur_ver -> $latest_ver"
	
	# not all systems have `sed -i` ;)
	sed "s/^pkgver=.*/pkgver=$latest_ver/" "$dir"/PKGBUILD > "$tmp"
	sed 's/^pkgrel=.*/pkgrel=1/' "$tmp" > "$dir"/PKGBUILD
	cd "$dir" || catch_err "$0" "cd into $dir"
	updpkgsums
	makepkg -sCcr
        # use this if you have aurutils for more reliable builds
        # aur chroot -B -N
	makepkg --printsrcinfo > .SRCINFO
	cd "$origdir" || catch_err "$0" "cd into $origdir...what did you do"

	unset name link jq_exp regex
done

exit 0