#!/usr/bin/env bash
#
# To install the hook copy this file to `.git/hooks/post-checkout` or run
# scripts/setup-rust install_hook

set -u

MULLVAD_SETUP_PLATFORM="${MULLVAD_SETUP_PLATFORM:-}"

SETUP_RUST_SCRIPT="scripts/setup-rust"

if [[ ! -f "$SETUP_RUST_SCRIPT" ]]; then
    exit 0
fi

if [[ -z "$MULLVAD_SETUP_PLATFORM" ]]; then
    case "$(uname -s)" in
        Linux) MULLVAD_SETUP_PLATFORM="linux" ;;
        Darwin) MULLVAD_SETUP_PLATFORM="macos" ;;
        MINGW*|CYGWIN*|MSYS*) MULLVAD_SETUP_PLATFORM="windows" ;;
        *)
            echo "Unable to detect current platform, MULLVAD_SETUP_PLATFORM must be set to one of: " >&2
            echo "\`android\`, \`ios\`, \`windows\`, \`linux\`, \`macos\`" >&2
            exit 1
            ;;
    esac
fi

git diff-tree --exit-code "$1".."$2" --quiet -- rust-toolchain.toml

# Exit code 1 means there was a change, 0 means no change.
if [[ $? -eq 1 ]]; then
    $SETUP_RUST_SCRIPT "$MULLVAD_SETUP_PLATFORM"
fi