# shellcheck shell=bash

github_latest() {
    repo="$1"
    tag="${2:-latest}"
    if [ "$tag" = "--no-latest-tag" ]; then
        curl -sfSL "https://github.com/$repo/tags" \
            | perl -ne 'm,a href="/'"$repo"'/releases/tag/v(\d\.\d(?:.\d)?)", && print "$1\n"' \
            | sort -V \
            | tail -n1 || echo "[github error]"
    else
        curl -sfSI "https://github.com/$repo/releases/$tag" \
            | grep '^location' \
            | awk -F/ '{print $NF}' \
            | sed 's/\s\+$//' || echo "[github error]"
    fi
}