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millw
executable file
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millw
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#!/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 parameter
# If no version is given, it falls back to the value of DEFAULT_MILL_VERSION
#
# Project page: https://github.com/lefou/millw
# Script Version: 0.4.5
#
# If you want to improve this script, please also contribute your changes back!
#
# Licensed under the Apache License, Version 2.0
set -e
if [ -z "${DEFAULT_MILL_VERSION}" ] ; then
DEFAULT_MILL_VERSION=0.10.9
fi
MILL_REPO_URL="https://github.com/com-lihaoyi/mill"
if [ -z "${CURL_CMD}" ] ; then
CURL_CMD=curl
fi
# Explicit commandline argument takes precedence over all other methods
if [ "$1" = "--mill-version" ] ; then
shift
if [ "x$1" != "x" ] ; then
MILL_VERSION="$1"
shift
else
echo "You specified --mill-version without a version." 1>&2
echo "Please provide a version that matches one provided on" 1>&2
echo "${MILL_REPO_URL}/releases" 1>&2
false
fi
fi
# Please note, that if a MILL_VERSION is already set in the environment,
# We reuse it's value and skip searching for a value.
# If not already set, read .mill-version file
if [ -z "${MILL_VERSION}" ] ; then
if [ -f ".mill-version" ] ; then
MILL_VERSION="$(head -n 1 .mill-version 2> /dev/null)"
elif [ -f ".config/mill-version" ] ; then
MILL_VERSION="$(head -n 1 .config/mill-version 2> /dev/null)"
fi
fi
if [ -n "${XDG_CACHE_HOME}" ] ; then
MILL_DOWNLOAD_PATH="${XDG_CACHE_HOME}/mill/download"
else
MILL_DOWNLOAD_PATH="${HOME}/.cache/mill/download"
fi
# If not already set, try to fetch newest from Github
if [ -z "${MILL_VERSION}" ] ; then
# TODO: try to load latest version from release page
echo "No mill version specified." 1>&2
echo "You should provide a version via '.mill-version' file or --mill-version option." 1>&2
mkdir -p "${MILL_DOWNLOAD_PATH}"
LANG=C touch -d '1 hour ago' "${MILL_DOWNLOAD_PATH}/.expire_latest" 2>/dev/null || (
# we might be on OSX or BSD which don't have -d option for touch
# but probably a -A [-][[hh]mm]SS
touch "${MILL_DOWNLOAD_PATH}/.expire_latest"; touch -A -010000 "${MILL_DOWNLOAD_PATH}/.expire_latest"
) || (
# in case we still failed, we retry the first touch command with the intention
# to show the (previously suppressed) error message
LANG=C touch -d '1 hour ago' "${MILL_DOWNLOAD_PATH}/.expire_latest"
)
# POSIX shell variant of bash's -nt operator, see https://unix.stackexchange.com/a/449744/6993
# if [ "${MILL_DOWNLOAD_PATH}/.latest" -nt "${MILL_DOWNLOAD_PATH}/.expire_latest" ] ; then
if [ -n "$(find -L "${MILL_DOWNLOAD_PATH}/.latest" -prune -newer "${MILL_DOWNLOAD_PATH}/.expire_latest")" ]; then
# we know a current latest version
MILL_VERSION=$(head -n 1 "${MILL_DOWNLOAD_PATH}"/.latest 2> /dev/null)
fi
if [ -z "${MILL_VERSION}" ] ; then
# we don't know a current latest version
echo "Retrieving latest mill version ..." 1>&2
LANG=C ${CURL_CMD} -s -i -f -I ${MILL_REPO_URL}/releases/latest 2> /dev/null | grep --ignore-case Location: | sed s'/^.*tag\///' | tr -d '\r\n' > "${MILL_DOWNLOAD_PATH}/.latest"
MILL_VERSION=$(head -n 1 "${MILL_DOWNLOAD_PATH}"/.latest 2> /dev/null)
fi
if [ -z "${MILL_VERSION}" ] ; then
# Last resort
MILL_VERSION="${DEFAULT_MILL_VERSION}"
echo "Falling back to hardcoded mill version ${MILL_VERSION}" 1>&2
else
echo "Using mill version ${MILL_VERSION}" 1>&2
fi
fi
MILL="${MILL_DOWNLOAD_PATH}/${MILL_VERSION}"
try_to_use_system_mill() {
MILL_IN_PATH="$(command -v mill || true)"
if [ -z "${MILL_IN_PATH}" ]; then
return
fi
UNIVERSAL_SCRIPT_MAGIC="@ 2>/dev/null # 2>nul & echo off & goto BOF"
if ! head -c 128 "${MILL_IN_PATH}" | grep -qF "${UNIVERSAL_SCRIPT_MAGIC}"; then
if [ -n "${MILLW_VERBOSE}" ]; then
echo "Could not determine mill version of ${MILL_IN_PATH}, as it does not start with the universal script magic2" 1>&2
fi
return
fi
# Roughly the size of the universal script.
MILL_VERSION_SEARCH_RANGE="2403"
MILL_IN_PATH_VERSION=$(head -c "${MILL_VERSION_SEARCH_RANGE}" "${MILL_IN_PATH}" |\
sed -n 's/^.*-DMILL_VERSION=\([^\s]*\) .*$/\1/p' |\
head -n 1)
if [ -z "${MILL_IN_PATH_VERSION}" ]; then
echo "Could not determine mill version, even though ${MILL_IN_PATH} has the universal script magic" 1>&2
return
fi
if [ "${MILL_IN_PATH_VERSION}" = "${MILL_VERSION}" ]; then
MILL="${MILL_IN_PATH}"
fi
}
try_to_use_system_mill
# If not already downloaded, download it
if [ ! -s "${MILL}" ] ; then
# support old non-XDG download dir
MILL_OLD_DOWNLOAD_PATH="${HOME}/.mill/download"
OLD_MILL="${MILL_OLD_DOWNLOAD_PATH}/${MILL_VERSION}"
if [ -x "${OLD_MILL}" ] ; then
MILL="${OLD_MILL}"
else
VERSION_PREFIX="$(echo $MILL_VERSION | cut -b -4)"
case $VERSION_PREFIX in
0.0. | 0.1. | 0.2. | 0.3. | 0.4. )
DOWNLOAD_SUFFIX=""
;;
*)
DOWNLOAD_SUFFIX="-assembly"
;;
esac
unset VERSION_PREFIX
DOWNLOAD_FILE=$(mktemp mill.XXXXXX)
# TODO: handle command not found
echo "Downloading mill ${MILL_VERSION} from ${MILL_REPO_URL}/releases ..." 1>&2
MILL_VERSION_TAG=$(echo $MILL_VERSION | sed -E 's/([^-]+)(-M[0-9]+)?(-.*)?/\1\2/')
${CURL_CMD} -f -L -o "${DOWNLOAD_FILE}" "${MILL_REPO_URL}/releases/download/${MILL_VERSION_TAG}/${MILL_VERSION}${DOWNLOAD_SUFFIX}"
chmod +x "${DOWNLOAD_FILE}"
mkdir -p "${MILL_DOWNLOAD_PATH}"
mv "${DOWNLOAD_FILE}" "${MILL}"
unset DOWNLOAD_FILE
unset DOWNLOAD_SUFFIX
fi
fi
if [ -z "$MILL_MAIN_CLI" ] ; then
MILL_MAIN_CLI="${0}"
fi
MILL_FIRST_ARG=""
if [ "$1" = "--bsp" ] || [ "$1" = "-i" ] || [ "$1" = "--interactive" ] || [ "$1" = "--no-server" ] || [ "$1" = "--repl" ] || [ "$1" = "--help" ] ; then
# Need to preserve the first position of those listed options
MILL_FIRST_ARG=$1
shift
fi
unset MILL_DOWNLOAD_PATH
unset MILL_OLD_DOWNLOAD_PATH
unset OLD_MILL
unset MILL_VERSION
unset MILL_VERSION_TAG
unset MILL_REPO_URL
# We don't quote MILL_FIRST_ARG on purpose, so we can expand the empty value without quotes
# shellcheck disable=SC2086
exec "${MILL}" $MILL_FIRST_ARG -D "mill.main.cli=${MILL_MAIN_CLI}" "$@"