1️⃣. Add this script to the root your the project directory

#!/bin/bash

REPORT="target/site/jacoco/jacoco.xml"
README="README.md"
TMPFILE=".coverage.tmp"

if [ ! -f "$REPORT" ]; then
  echo "❌ JaCoCo XML report not found at $REPORT"
  exit 1
fi

# Step 1: Generate new coverage report content
{
  echo "## 📊 Code Coverage Report"
  echo ""
  echo "| Metric      | Covered | Missed | Total | Coverage |"
  echo "|-------------|---------|--------|--------|----------|"

  METRICS=("INSTRUCTION" "LINE" "BRANCH" "METHOD" "CLASS" "COMPLEXITY")

  for METRIC in "${METRICS[@]}"; do
    COVERED=$(xmllint --xpath "string(//report/counter[@type='$METRIC']/@covered)" "$REPORT")
    MISSED=$(xmllint --xpath "string(//report/counter[@type='$METRIC']/@missed)" "$REPORT")
    TOTAL=$((COVERED + MISSED))

    if [ "$TOTAL" -eq 0 ]; then
      PERCENT=0
    else
      PERCENT=$(awk "BEGIN {printf \"%.2f\", ($COVERED / $TOTAL) * 100}")
    fi

    if (( $(echo "$PERCENT < 100.0" | bc -l) )); then
      DISPLAY_PERCENT="${PERCENT}% ⚠️"
    else
      DISPLAY_PERCENT="${PERCENT}% ✅"
    fi

    echo "| $METRIC | $COVERED | $MISSED | $TOTAL | $DISPLAY_PERCENT |"
  done

} > "$TMPFILE"

# Step 2: Remove any old coverage section and replace with the new one
# If markers exist, clean them out
if grep -q "<!-- coverage start -->" "$README"; then
  sed -i.bak '/<!-- coverage start -->/,/<!-- coverage end -->/d' "$README"
fi

# Step 3: Append the new section at the end of the README
{
  echo ""
  echo "<!-- coverage start -->"
  cat "$TMPFILE"
  echo "<!-- coverage end -->"
} >> "$README"

rm "$TMPFILE"

echo "✅ README.md updated with full coverage report (overwriting any existing section)."

2️⃣. Update Maven pom.xml for the project

<plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>exec-maven-plugin</artifactId>
  <version>3.5.0</version>
  <executions>
    <execution>
      <id>update-readme</id>
      <phase>verify</phase>
      <goals>
        <goal>exec</goal>
      </goals>
      <configuration>
        <executable>bash</executable>
        <arguments>
          <argument>${project.basedir}/update-coverage.sh</argument>
        </arguments>
      </configuration>
    </execution>
  </executions>
</plugin>