check-split-packages.sh

#!/bin/bash
# Usage: ./check-split-packages.sh /path/to/your/root/dir
ROOT_DIR="${1:-.}"  # default to current dir if no argument passed

# Use process substitution instead of pipes to avoid subshell issues
declare -A package_map
declare -A seen
declare -A last_conflict_jar  # Track the last conflicting jar for each package

echo "🔍 Scanning all JARs under: $ROOT_DIR (excluding test JARs)"

# Get all JAR files first, excluding test JARs
jar_files=()
while IFS= read -r jar; do
  # Skip JAR files ending with "-tests.jar"
  if [[ "$jar" != *"-tests.jar" ]]; then
    jar_files+=("$jar")
  fi
done < <(find "$ROOT_DIR" -type f -name "*.jar")

echo "Found ${#jar_files[@]} non-test JAR files to analyze"

# Process each JAR file
for jar in "${jar_files[@]}"; do
  jarname=$(realpath "$jar")
  jarbasename=$(basename "$jarname")  # Get just the filename without path
  tmpdir=$(mktemp -d)
  unzip -qq "$jar" -d "$tmpdir"
  
  # Get all class files
  class_files=()
  while IFS= read -r classfile; do
    class_files+=("$classfile")
  done < <(find "$tmpdir" -type f -name "*.class")
  
  # Process each class file
  for classfile in "${class_files[@]}"; do
    pkg=$(dirname "${classfile#$tmpdir/}" | tr '/' '.')
    [[ "$pkg" == "." ]] && continue  # skip default package
    
    if [ -n "${package_map[$pkg]}" ]; then
      if [ "${package_map[$pkg]}" != "$jarbasename" ]; then
        if [[ -z "${seen[$pkg]}" ]]; then
          # First time seeing this conflict
          echo "🚨 Split package detected: $pkg"
          echo "    ↳ in: ${package_map[$pkg]}"
          echo "    ↳ and: $jarbasename"
          seen[$pkg]=1
          last_conflict_jar[$pkg]="$jarbasename"
        elif [[ "${last_conflict_jar[$pkg]}" != "$jarbasename" ]]; then
          # New jar with same conflict
          echo "    ↳ also in: $jarbasename"
          last_conflict_jar[$pkg]="$jarbasename"
        fi
        # If it's the same jar as last time, we don't print anything
      fi
    else
      package_map[$pkg]=$jarbasename;
    fi
  done
  
  rm -rf "$tmpdir"
done

if [[ ${#seen[@]} -eq 0 ]]; then
    echo "✅ No split packages found!"
else
    echo "❌ Split packages detected — please fix before modularizing."
    exit 1
fi