#!/bin/bash -e
#
# based on : https://hdpe.me/post/maven-checkstyle-pre-commit-hook/
#
# DESCRIPTION
# Considering only the staged .java files, it walks the filesystem tree
# to look for any modules (it considers a module if it has a pom.xml file).
# For each module found it runs Checkstyle on it.

function get_module() {
  local path=$1;
  while true; do
    path=$(dirname $path);
    if [ -f "$path/pom.xml" ]; then
      echo "$path";
      return;
    elif [[ "./" =~ "$path" ]]; then
      return;
    fi
  done
}

modules=();

for file in $(git diff --name-only --cached \*.java); do
  module=$(get_module "$file");
  if [ "" != "$module" ] \
      && [[ ! " ${modules[@]} " =~ " $module " ]]; then
    modules+=("$module");
  fi
done;

if [ ${#modules[@]} -eq 0 ]; then
  exit;
fi

for dir in ${modules[@]}; do
  cd ${dir};
  mvn checkstyle:check -Dcheckstyle.config.location=google_checks.xml -Dcheckstyle.consoleOutput=true;
  cd ..;
done;