_7zz: fix update script

#! /usr/bin/env nix-shell

#! nix-shell -i bash -p coreutils gnused curl jq nix-prefetch

#! nix-shell -i bash -p curl xq-xml nix-prefetch

set -euo pipefail

cd "$(dirname "${BASH_SOURCE[0]}")"

DRV_DIR="$PWD"

OLD_VERSION="$(sed -nE 's/\s*version = "(.*)".*/\1/p' ./default.nix)"

# The best_release.json is not always up-to-date

# In those cases you can force the version by calling `./update.sh <newer_version>`

NEW_VERSION="${1:-$(curl -H "Accept: application/json" 'https://sourceforge.net/projects/sevenzip/best_release.json' | jq '.platform_releases.linux.filename' -r | cut -d/ -f3)}"

NEW_VERSION="$(curl -H 'Accept: application/rss+xml' 'https://sourceforge.net/projects/sevenzip/rss?path=/7-Zip' | xq -x "substring((/rss/channel/item[link[contains(., 'src.tar.xz')]])[1]/title, 8, 5)")"

echo "comparing versions $OLD_VERSION => $NEW_VERSION"

if [[ "$OLD_VERSION" == "$NEW_VERSION" ]]; then

NEW_VERSION_FORMATTED="$(echo "$NEW_VERSION" | tr -d '.')"

URL="https://7-zip.org/a/7z${NEW_VERSION_FORMATTED}-src.tar.xz"

# `nix-prefetch` is broken without flakes

# see https://github.com/msteen/nix-prefetch/issues/51

NEW_FREE_HASH=$(nix-prefetch -f "$NIXPKGS_ROOT" -E "_7zz.src" --url "$URL" --option extra-experimental-features flakes)

NEW_FREE_HASH=$(nix-prefetch -f "$NIXPKGS_ROOT" -E "_7zz.src" --url "$URL")

NEW_UNFREE_OUT=$(nix-prefetch -f "$NIXPKGS_ROOT" -E "(_7zz.override { enableUnfree = true; }).src" --url "$URL" --output raw --print-path)

NEW_UNFREE_OUT=$(nix-prefetch -f "$NIXPKGS_ROOT" -E "(_7zz.override { enableUnfree = true; }).src" --url "$URL" --output raw --print-path --option extra-experimental-features flakes)

# first line of raw output is the hash

NEW_UNFREE_HASH="$(echo "$NEW_UNFREE_OUT" | sed -n 1p)"

# second line of raw output is the src path