#!/bin/sh
# Check repository for outdated packages
#
# Intended behavior.
# shellcheck disable=2106

[ "$1" ] || {
    printf 'usage: kiss outdated /path/to/repo\n' >&2
    exit 1
}

cd "$1" 2>/dev/null || {
    printf 'repository %s is inaccessible\n' "$1" >&2
    exit 1
}

printf 'Checking repology.org for outdated packages in %s\n' "$1" >&2

for pkg in */; do
    pkg=${pkg%%/}

    read -r ver _ 2>/dev/null < "$pkg/version" || {
        printf '%s: local version not found\n' "$pkg" >&2
        continue
    }

    [ "$ver" = git ] && {
        printf '%s: skipping, version is git\n' "$pkg" >&2
        continue
    }

    pkg=${pkg%%-bin}
    pkg=${pkg%%-git}

    rep=$(curl -s "https://repology.org/badge/latest-versions/$pkg.svg") || {
        printf '%s: failed to grab version from repology\n' "$pkg" >&2
        continue
    }

    rep=${rep%</text>*}
    rep=${rep##*>}

    case $rep in
        *", $ver"* | *"$ver,"* | "$ver")
            # Found match, do nothing.
        ;;

        - | '' | ' ')
            printf '%s: empty response, is pkg named correctly?\n' "$pkg" >&2
        ;;

        *)
            printf '%s: %s -> %s\n' "$pkg" "$ver" "$rep"
        ;;
    esac
done