mw

#!/usr/bin/env bash

# DEFAULTS may be overridden by calling environment.
MVN="${MVN:-mvn}"
MVNW="${MVNW:-mvnw}"
MVN_POMFILE="${MVN_POMFILE:-pom.xml}"

err() {
  echo -e "${@}" >&2
}

lookup() {
  local file="${1}"
  local curr_path="${2}"
  [[ -z "${curr_path}" ]] && curr_path="${PWD}"

  # Search recursively upwards for file.
  until [[ "${curr_path}" == "/" ]]; do
    if [[ -e "${curr_path}/${file}" ]]; then
      echo "${curr_path}/${file}"
      break
    else
      curr_path=$(dirname "${curr_path}")
    fi
  done
}

select_mvn() {
  local dir="${1}"

  # Use project's mvnw if found.
  local mvnw=$(lookup "${MVNW}" "${dir}")
  if [[ -z "${mvnw}" ]]; then
    err "No ${MVNW} set up for this project; consider setting one up:"
    err "https://github.com/takari/takari-maven-plugin\n"
  else
    echo "${mvnw}"
    return 0
  fi

  # Deal with a missing wrapper by defaulting to system mvn.
  local mvn=$(which "${MVN}" 2>/dev/null)
  if [[ -z ${mvn} ]]; then
    err "'${MVN}' not installed or not available in your PATH:"
    err "${PATH}"
  else
    echo "${mvn}"
    return 0
  fi

  return 1
}

execute_mvn() {
  local pom_xml=$(lookup "${MVN_POMFILE}")
  local mvn=$(select_mvn "${working_dir}")
  local build_args=( ${BUILD_ARG} "$@" )

  if [[ -n "${pom_xml}" ]]; then
    # We got a good build file, start mvnw there.
    cd "$(dirname "${pom_xml}")"
  else
    err "Unable to find a mvn build file named ${MVN_POMFILE}."
  fi

  # Say what we are gonna do, then do it.
  err "Using mvn at '${mvn}' to run POM '${pom_xml}':\n"
  if [[ -n "build_args[@]" ]]; then
    "${mvn}" "${build_args[@]}"
  else
    "${mvn}"
  fi
}

# gw may be sourced from other scripts as a library to select / run mvn(w).
if [[ ${BASH_SOURCE[0]} != $0 ]]; then
  export -f execute_mvn select_mvn lookup err
else
  set -e
  execute_mvn "$@"
  exit $?
fi