#!/bin/sh
set -eu

repo_root=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
output_dir=${1:-"$repo_root/reassembled"}

mkdir -p "$output_dir"

find "$repo_root/archives" -mindepth 1 -maxdepth 1 -type d -name '*.parts' -print | sort |
while IFS= read -r parts_dir; do
    archive_name=$(basename "$parts_dir" .parts)
    destination="$output_dir/$archive_name"
    echo "Reassembling $archive_name"
    find "$parts_dir" -type f -name 'part-*' -print | sort | xargs cat > "$destination"
done

for archive in "$repo_root"/archives/*; do
    if [ -f "$archive" ]; then
        archive_name=$(basename "$archive")
        [ -e "$output_dir/$archive_name" ] || ln -s "$archive" "$output_dir/$archive_name"
    fi
done

(cd "$output_dir" && shasum -a 256 -c "$repo_root/checksums/main-archives.sha256")