Update Script Implementation.md

#!/bin/bash
set -e

# This script performs a 3-way merge between:
# 1. Original Kubebuilder template (base)
# 2. Current project state (ours)
# 3. Latest Kubebuilder template (theirs)

# Set up variables
CURRENT_VERSION="$1"
TARGET_VERSION="$2"
DOMAIN="$3"
REPO="$4"

echo "Current Kubebuilder version: $CURRENT_VERSION"
echo "Target Kubebuilder version: $TARGET_VERSION"
echo "Project domain: $DOMAIN"
echo "Project repo: $REPO"

# Create temporary directories
ORIGINAL_TEMPLATE="/tmp/kb-original"
LATEST_TEMPLATE="/tmp/kb-latest"
CURRENT_PROJECT="$(pwd)"

mkdir -p "$ORIGINAL_TEMPLATE"
mkdir -p "$LATEST_TEMPLATE"

# Create original template project
pushd "$ORIGINAL_TEMPLATE" > /dev/null
kubebuilder init --domain "$DOMAIN" --repo "$REPO" --plugins="$CURRENT_VERSION"
popd > /dev/null

# Create latest template project
pushd "$LATEST_TEMPLATE" > /dev/null
kubebuilder init --domain "$DOMAIN" --repo "$REPO" --plugins="$TARGET_VERSION"
popd > /dev/null

# List of files to check for merging
FILES=(
  "Makefile"
  "PROJECT"
  "go.mod"
  ".github/workflows/ci.yaml"
  "hack/boilerplate.go.txt"
)

# Perform 3-way merge for each file
for file in "${FILES[@]}"; do
  echo "Processing file: $file"
  
  # Check if file exists in all three locations
  if [[ -f "$ORIGINAL_TEMPLATE/$file" && -f "$LATEST_TEMPLATE/$file" && -f "$CURRENT_PROJECT/$file" ]]; then
    # Create directory for the file if needed
    mkdir -p "$(dirname "$CURRENT_PROJECT/$file.merged")"
    
    # Perform 3-way merge
    git merge-file -p \
      "$CURRENT_PROJECT/$file" \
      "$ORIGINAL_TEMPLATE/$file" \
      "$LATEST_TEMPLATE/$file" > "$CURRENT_PROJECT/$file.merged"
      
    # Check if there were conflicts
    if [ $? -eq 0 ]; then
      echo "Successfully merged $file without conflicts"
      mv "$CURRENT_PROJECT/$file.merged" "$CURRENT_PROJECT/$file"
    
    else
     
     echo "Conflicts detected in $file"
      # Keep the merged file with conflict markers
      mv "$CURRENT_PROJECT/$file.merged" "$CURRENT_PROJECT/$file"
      echo "$file" >> conflict_files.txt
    
    fi
  
  elif [[ ! -f "$ORIGINAL_TEMPLATE/$file" && -f "$LATEST_TEMPLATE/$file" && ! -f "$CURRENT_PROJECT/$file" ]]; then
    # New file in latest template that doesn't exist in original or current project
    echo "Adding new file from template: $file"
    mkdir -p "$(dirname "$CURRENT_PROJECT/$file")"
    cp "$LATEST_TEMPLATE/$file" "$CURRENT_PROJECT/$file"
  
  elif [[ -f "$ORIGINAL_TEMPLATE/$file" && ! -f "$LATEST_TEMPLATE/$file" && -f "$CURRENT_PROJECT/$file" ]]; then
    # File removed in latest template
    echo "File removed in latest template: $file"
    # For now, we keep the user's file but notify
    echo "$file" >> removed_files.txt
  
  fi

done

echo "Merge process completed."

# Summary
if [ -f conflict_files.txt ]; then
  echo "Conflicts were detected in the following files:"
  cat conflict_files.txt
  echo "Please resolve these conflicts manually."
fi

if [ -f removed_files.txt ]; then
  echo "The following files were removed in the latest template but kept in your project:"
  cat removed_files.txt
  echo "You may want to review these files to see if they should be removed."
fi