Script to download and or update ninja build tool

ninja-install.sh

#!/bin/sh
DIR=$(dirname $(realpath $0))
folder_uid=$(id -u $(find "${DIR}" -maxdepth 0 -printf '%u\n'))
[ "${folder_uid}" -eq 0 ] && [ "$(id -u)" -ne "${folder_uid}" ] && sudo="sudo "

latest_version() {
  local RELEASE="https://github.com/ninja-build/ninja/releases/latest"
  case "$CMD" in
    *xh*) xh HEAD $RELEASE --no-check-status -h | awk '/^location:/{print $2}' | awk -F/ '{print $NF}';;
    *curl*) curl -ISs $RELEASE | awk '/^location:/{print $2}' | awk -F/ '{print $NF}';;
    *wget*) wget --max-redirect=0 $RELEASE 2>&1 | awk '/^Location:/{print $2}' | awk -F/ '{print $NF}';;
  esac
}

download() {
  local URL=$1
  local FILE="$(basename ${URL})"
  case "$CMD" in
    *aria2c*)
    aria2c $URL -j5 -x10 -s8 -k1M --optimize-concurrent-downloads --header="Accept-Encoding: zstd, gzip, deflate" -c;;
    *xh*)
    xh -Fcd $URL Accept-Encoding:'zstd, gzip, deflate';;
    *curl*)
    curl -#LOJ $URL --compressed -H "Accept-Encoding: zstd, gzip, deflate" -C -;;
    *wget*)
    wget -q --show-progress $URL --header="Accept-Encoding: zstd, gzip, deflate" -c;;
  esac
  unzip $FILE && rm $FILE
  chmod +x ninja
  ${sudo}mv -f ninja $DIR
}

CMD="$(type -P {aria2c,xh,curl,wget})"
case "$(type ${DIR}/ninja)" in
  *not\ found) download "https://github.com/ninja-build/ninja/releases/latest/download/ninja-linux.zip";;
  *ninja)
  VERSION=$(${DIR}/ninja --version)
  LATEST=$(latest_version)
  OUTPUT=$(printf "$VERSION\n$LATEST" | sed '/^$/d' | sort -Vr | head -1)
  if [ "$VERSION"=="$OUTPUT" ]; then
    echo "Ninja is up to date"
  else
    download "https://github.com/ninja-build/ninja/releases/download/$LATEST/ninja-linux.zip"
  fi;;
esac