#!/usr/bin/env sh

# This is a wrapper script, that automatically download mill from GitHub release pages

# You can give the required mill version with MILL_VERSION env variable

# If no version is given, it falls back to the value of DEFAULT_MILL_VERSION

DEFAULT_MILL_VERSION=0.6.3

set -e

if [ -z "$MILL_VERSION" ] ; then

  if [ -f ".mill-version" ] ; then

    MILL_VERSION="$(head -n 1 .mill-version 2> /dev/null)"

  elif [ -f "mill" ] && [ "$BASH_SOURCE" != "mill" ] ; then

    MILL_VERSION=$(grep -F "DEFAULT_MILL_VERSION=" "mill" | head -n 1 | cut -d= -f2)

  else

    MILL_VERSION=$DEFAULT_MILL_VERSION

  fi

fi

if [ "x${XDG_CACHE_HOME}" != "x" ] ; then

  MILL_DOWNLOAD_PATH="${XDG_CACHE_HOME}/mill/download"

else

  MILL_DOWNLOAD_PATH="${HOME}/.cache/mill/download"

fi

MILL_EXEC_PATH="${MILL_DOWNLOAD_PATH}/${MILL_VERSION}"

version_remainder="$MILL_VERSION"

MILL_MAJOR_VERSION="${version_remainder%%.*}"; version_remainder="${version_remainder#*.}"

MILL_MINOR_VERSION="${version_remainder%%.*}"; version_remainder="${version_remainder#*.}"

if [ ! -x "$MILL_EXEC_PATH" ] ; then

  mkdir -p $MILL_DOWNLOAD_PATH

  if [ "$MILL_MAJOR_VERSION" -gt 0 ] || [ "$MILL_MINOR_VERSION" -ge 5 ] ; then

    ASSEMBLY="-assembly"

  fi

  DOWNLOAD_FILE=$MILL_EXEC_PATH-tmp-download

  MILL_DOWNLOAD_URL="https://github.com/lihaoyi/mill/releases/download/${MILL_VERSION%%-*}/$MILL_VERSION${ASSEMBLY}"

  curl --fail -L -o "$DOWNLOAD_FILE" "$MILL_DOWNLOAD_URL"

  chmod +x "$DOWNLOAD_FILE"

  mv "$DOWNLOAD_FILE" "$MILL_EXEC_PATH"

  unset DOWNLOAD_FILE

  unset MILL_DOWNLOAD_URL

fi

unset MILL_DOWNLOAD_PATH

unset MILL_VERSION

exec $MILL_EXEC_PATH "$@"