#!/usr/bin/env nix-shell
#!nix-shell -i bash -p curl jq git moreutils nix nix-prefetch
set -euo pipefail

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


json_get() {
    jq -r "$1" < 'meta.json'
}

json_set() {
    jq --arg x "$2" "$1 = \$x" < 'meta.json' | sponge 'meta.json'
}

old_rev=$(json_get '.rev')
new_rev=$(curl -L "https://gitlab.com/api/v4/projects/famedly%2Fconduit/repository/commits" 2>/dev/null | jq ".[0].id" -r)

if [ "$new_rev" = "$old_rev" ]; then
    echo "conduit is up-to-date."
    exit
fi

json_set '.rev' "$new_rev"
new_sha256=$(nix-prefetch fetchFromGitLab --owner famedly --repo conduit --rev "$new_rev")
json_set '.sha256' "$new_sha256"