pre-commit

#!/usr/bin/env bash
set -euo pipefail

FORMATTER_VERSION="2.89.0"
CACHE_DIR="${HOME}/.cache/palantir-java-format"
BINARY="${CACHE_DIR}/palantir-java-format-${FORMATTER_VERSION}"
BASE_URL="https://repo1.maven.org/maven2/com/palantir/javaformat/palantir-java-format-native/${FORMATTER_VERSION}"

# Collect staged Java files
STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM -- '*.java' || true)

if [ -z "$STAGED_FILES" ]; then
    exit 0
fi

# Download native binary if not cached
if [ ! -x "$BINARY" ]; then
    OS=$(uname -s)
    ARCH=$(uname -m)

    case "${OS}-${ARCH}" in
        Linux-x86_64)  SUFFIX="linux-glibc_x86-64" ;;
        Linux-aarch64) SUFFIX="linux-glibc_aarch64" ;;
        Darwin-arm64)  SUFFIX="macos_aarch64" ;;
        *)
            echo "ERROR: No palantir-java-format native binary for ${OS}-${ARCH}."
            echo "       Supported: Linux x86_64, Linux aarch64, macOS aarch64."
            exit 1
            ;;
    esac

    ARTIFACT="palantir-java-format-native-${FORMATTER_VERSION}-nativeImage-${SUFFIX}.bin"
    DOWNLOAD_URL="${BASE_URL}/${ARTIFACT}"

    echo "Downloading palantir-java-format ${FORMATTER_VERSION} (${SUFFIX})..."
    mkdir -p "$CACHE_DIR"

    if ! curl -sSfL -o "$BINARY" "$DOWNLOAD_URL"; then
        rm -f "$BINARY"
        echo "ERROR: Failed to download palantir-java-format from:"
        echo "       $DOWNLOAD_URL"
        exit 1
    fi

    chmod +x "$BINARY"
fi

# Check formatting
UNFORMATTED=()
for FILE in $STAGED_FILES; do
    if [ -f "$FILE" ]; then
        if ! "$BINARY" --palantir --dry-run --set-exit-if-changed "$FILE" > /dev/null 2>&1; then
            UNFORMATTED+=("$FILE")
        fi
    fi
done

if [ ${#UNFORMATTED[@]} -gt 0 ]; then
    echo ""
    echo "ERROR: The following files are not formatted with palantir-java-format:"
    echo ""
    for FILE in "${UNFORMATTED[@]}"; do
        echo "  $FILE"
    done
    echo ""
    echo "Run the following command to fix:"
    echo ""
    echo "  $BINARY --palantir --replace ${UNFORMATTED[*]}"
    echo ""
    exit 1
fi