pre-commit

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

FORMATTER_VERSION="2.98.0.4"
CACHE_DIR="${HOME}/.cache/open-java-format"
BASE_URL="https://repo1.maven.org/maven2/dev/openjavaformat/open-java-format-native/${FORMATTER_VERSION}"

# The Windows binary is an .exe, on Maven Central and on disk.
case "$(uname -s)" in
    MINGW* | MSYS* | CYGWIN*) EXTENSION="exe"; EXE=".exe" ;;
    *) EXTENSION="bin"; EXE="" ;;
esac
BINARY="${CACHE_DIR}/open-java-format-${FORMATTER_VERSION}${EXE}"

# Read exclude patterns from .open-java-format-exclude (repo root), if present.
# Each non-empty, non-comment line is a git pathspec whose matches are skipped.
# This file is the single source of exclusions, shared with the GitHub Action.
EXCLUDES=()
EXCLUDE_FILE=".open-java-format-exclude"
if [ -f "$EXCLUDE_FILE" ]; then
    while IFS= read -r line || [ -n "$line" ]; do
        line="${line#"${line%%[![:space:]]*}"}"
        line="${line%"${line##*[![:space:]]}"}"
        case "$line" in ''|\#*) continue ;; esac
        EXCLUDES+=(":(exclude)$line")
    done < "$EXCLUDE_FILE"
fi

# Collect staged Java files (respecting excludes)
if [ ${#EXCLUDES[@]} -gt 0 ]; then
    STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACMR -- '*.java' "${EXCLUDES[@]}" || true)
else
    STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACMR -- '*.java' || true)
fi

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" ;;
        Darwin-x86_64) SUFFIX="macos_x86-64" ;;
        MINGW*-x86_64 | MSYS*-x86_64 | CYGWIN*-x86_64) SUFFIX="windows_x86-64" ;;
        *)
            echo "ERROR: No open-java-format native binary for ${OS}-${ARCH}."
            echo "       Supported: Linux x86_64, Linux aarch64, macOS aarch64, macOS x86_64, Windows x86_64."
            exit 1
            ;;
    esac

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

    echo "Downloading open-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 open-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 ! "$BINARY" --dry-run --set-exit-if-changed "$FILE" > /dev/null 2>&1; then
            UNFORMATTED+=("$FILE")
        fi
    fi
done

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