#!/bin/echo Must be sourced from a bash script **

# strict mode
export IFS=$'\n'
set -eu -o pipefail

# git clone wrapper
clone () {
  if ! [ -e "$2" ]; then
    git clone \
      --single-branch --depth 1 \
      --recurse-submodules \
      "$1" \
      "$2"
  else
    echo " ** '$2/' already exists"
  fi
}

# make -j12
make_maxthreads() {
  [ -v JOBS ] || JOBS=$(nproc || echo 4)
  JOBS="${JOBS//[^0-9]/}"
  make -j"$JOBS"
}