.envrc

# Function to compare Nix versions
nix_version_ge() {
    # Compare two version numbers
    [ "$1" = "$2" ] && return 0
    local IFS=.
    local i ver1=($1) ver2=($2)
    # Fill empty fields in ver1 with zeros
    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++)); do
        ver1[i]=0
    done
    for ((i=0; i<${#ver1[@]}; i++)); do
        if [[ -z ${ver2[i]} ]]; then
            # Fill empty fields in ver2 with zeros
            ver2[i]=0
        fi
        if ((10#${ver1[i]} > 10#${ver2[i]})); then
            return 0
        fi
        if ((10#${ver1[i]} < 10#${ver2[i]})); then
            return 1
        fi
    done
    return 0
}

# Get the current version of nix
current_nix_version=$(nix --version | awk '{print $3}')

# Required version of nix
required_nix_version="2.23"

# Check if the current version is greater than or equal to the required version
if ! nix_version_ge "$current_nix_version" "$required_nix_version"; then
    echo "Installed Nix version $current_nix_version is < $required_nix_version. Please upgrade: https://github.com/DeterminateSystems/nix-installer?tab=readme-ov-file#upgrading-nix." >&2
    exit 1
fi

# Check to ensure an up-to-date version of direnv is installed
if ! direnv_version 2.32.0; then
  exit 1
fi

if ! has nix_direnv_version || ! nix_direnv_version 3.0.4; then
  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.4/direnvrc" "sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4="
fi

watch_file flake.nix
watch_file flake.lock
watch_file devenv.nix

if ! use flake . --impure
then
  echo "devenv could not be built. The devenv environment was not loaded. Make the necessary changes to devenv.nix and hit enter to try again." >&2
fi

dotenv_if_exists .env