jfr-cli

#!/bin/bash

# JFR Shell launcher script with rebuild-on-change

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_DIR="$SCRIPT_DIR/jfr-shell"
HASH_FILE="$PROJECT_DIR/.last_build_hash"

compute_hash() {
  # Compute a combined hash across jfr-shell, parser, tools, and top-level gradle files
  (
    cd "$SCRIPT_DIR" >/dev/null
    # Build the list of files (null-separated) deterministically
    build_list() {
      # Only include dirs that exist
      for d in jfr-shell parser tools; do
        if [ -d "$d" ]; then
          find "$d" -type f \
            ! -path '*/.last_build_hash' \
            ! -path '*/build/*' \
            ! -path '*/.gradle/*' \
            ! -path '*/.idea/*' \
            ! -path '*/out/*' \
            ! -path '*/src/test/*' \
            ! -name '*.iml' -print0
        fi
      done
      # Top-level gradle files if present
      for f in build.gradle settings.gradle gradle.properties; do
        if [ -f "$f" ]; then printf '%s\0' "$f"; fi
      done
    }
    if command -v sha256sum >/dev/null 2>&1; then
      build_list | sort -z | xargs -0 sha256sum | sha256sum | awk '{print $1}'
    elif command -v shasum >/dev/null 2>&1; then
      build_list | sort -z | xargs -0 shasum -a 256 | shasum -a 256 | awk '{print $1}'
    else
      if ! command -v openssl >/dev/null 2>&1; then
        echo "No sha256 utility available (sha256sum/shasum/openssl)" >&2
        exit 1
      fi
      build_list | sort -z | while IFS= read -r -d '' f; do
        openssl dgst -sha256 "$f" | awk -v p="$f" '{print $2, p}'
      done | openssl dgst -sha256 | awk '{print $2}'
    fi
  )
}

# Determine current and previous hashes
echo "Computing jfr-shell hash"
NEW_HASH="$(compute_hash)"
OLD_HASH=""
if [ -f "$HASH_FILE" ]; then
  OLD_HASH="$(cat "$HASH_FILE" | tr -d '\n' || true)"
fi

# Locate current jar (if any)
JAR_PATH=$(ls -1t "$PROJECT_DIR/build/libs"/jfr-shell-*.jar 2>/dev/null | head -n1 || true)

# Build if no jar or hash changed
if [ ! -f "$JAR_PATH" ] || [ "$NEW_HASH" != "$OLD_HASH" ]; then
  echo "Building JFR Shell (changes detected)..."
  ( cd "$SCRIPT_DIR" && ./gradlew -q :jfr-shell:shadowJar )
  # Update jar path after build
  JAR_PATH=$(ls -1t "$PROJECT_DIR/build/libs"/jfr-shell-*.jar 2>/dev/null | head -n1 || true)
  if [ -z "$JAR_PATH" ] || [ ! -f "$JAR_PATH" ]; then
    echo "Failed to build jfr-shell shadow jar" >&2
    exit 1
  fi
  # Persist new hash
  echo "$NEW_HASH" > "$HASH_FILE"
fi

# Run shaded jar
exec java -jar "$JAR_PATH" "$@"