#!/usr/bin/env bash
usage() {
  echo "Usage: $0 dir"
  echo "dir - Project directory"
  exit 1
}

readExclusions() {
  [ -e "${proj}/${exclusionsFile}" ] &&
    { readarray -t exclusions < <(cat "${proj}/${exclusionsFile}") ||
      echo "Unable to read ${proj}/${exclusionsFile}"; }
}

require() {
  hash "$@" || exit 127
}
path() {
  dirname "$(readlink -f "$1")"
}
require cat rm find java dirname readlink nproc
dir="$(path "$0")"
declare -r rulesFile="${dir}/pmdrules.xml"
declare -r cacheFile="pmd.cache"
declare -r errFile="pmd.errors"
declare -r auxCpFile="compile.cp"
auxCp=""
declare -r setupcp="setupclasspath"
declare -r format="text"
#shellcheck disable=SC2155
declare -i threads=$(nproc --all)
declare -i minpriority=5
declare -r classpathFile="${dir}/pmd.cp"
pmdCp=$(cat "$classpathFile")
declare -r mainClass="net.sourceforge.pmd.PMD"
declare -r exclusionsFile=".exclusions"
declare -r fileslist="pmdfiles.txt"
declare -a exclusions
declare -i res=0
proj="$1"

if [ "$#" -ne 1 ] || ! [ -d "$proj" ]; then
  usage
fi

readExclusions
(
  declare -i res=0
  set -o noglob
  cd "$proj" || exit
  if [ -e "$fileslist" ]; then
    rm ./"$fileslist"
  fi
  if [ -e "$setupcp" ]; then
    ./"$setupcp"
    auxCp=$(cat "$auxCpFile")
  fi
  find . -type f -regex ".*[.]\(java\|jsp\|xml\|pom\)$" "${exclusions[@]}" | tr '\n' ',' >"$fileslist"
  if [ -s "$fileslist" ]; then
    java -cp "$pmdCp" \
      "$mainClass" \
      --file-list "$fileslist" --rulesets "$rulesFile" --format "$format" \
      --minimum-priority "$minpriority" --no-ruleset-compatibility \
      --fail-on-violation true --cache "$cacheFile" \
      --report-file "$errFile" \
      --aux-classpath "$auxCp":. \
      --threads "$threads" ||
      {
        exitCode="$?"
        echo "$0 exited with error code $exitCode"
        exit "$exitCode"
      }
    res=$?
  fi
  set +o noglob
  exit "$res"
)
exit $?