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#!/usr/bin/env bash

# Copyright 2023 Pants project contributors (see CONTRIBUTORS.md).

# Licensed under the Apache License, Version 2.0 (see LICENSE).

set -euo pipefail

COLOR_RED="\x1b[31m"

COLOR_GREEN="\x1b[32m"

COLOR_YELLOW="\x1b[33m"

COLOR_RESET="\x1b[0m"

function log() {

echo -e "$@" 1>&2

}

function die() {

(($# > 0)) && log "${COLOR_RED}$*${COLOR_RESET}"

exit 1

}

function green() {

(($# > 0)) && log "${COLOR_GREEN}$*${COLOR_RESET}"

}

function warn() {

(($# > 0)) && log "${COLOR_YELLOW}$*${COLOR_RESET}"

}

function check_cmd() {

local cmd="$1"

command -v "$cmd" > /dev/null || die "This script requires the ${cmd} binary to be on the PATH."

}

help_url="https://www.pantsbuild.org/docs/getting-help"

_GC=()

function gc() {

if (($# > 0)); then

check_cmd rm

_GC+=("$@")

else

rm -rf "${_GC[@]}"

fi

}

trap gc EXIT

check_cmd uname

function calculate_os() {

local os

os="$(uname -s)"

if [[ "${os}" =~ [Ll]inux ]]; then

echo linux

elif [[ "${os}" =~ [Dd]arwin ]]; then

echo macos

elif [[ "${os}" =~ [Ww]in|[Mm][Ii][Nn][Gg] ]]; then

# Powershell reports something like: Windows_NT

# Git bash reports something like: MINGW64_NT-10.0-22621

echo windows

else

die "Pants is not supported on this operating system (${os}). Please reach out to us at ${help_url} for help."

fi

}

OS="$(calculate_os)"

check_cmd basename

if [[ "${OS}" == "windows" ]]; then

check_cmd pwsh

else

check_cmd curl

fi

function fetch() {

local url="$1"

local dest_dir="$2"

local dest

dest="${dest_dir}/$(basename "${url}")"

if [[ "${OS}" == "windows" ]]; then

pwsh -c "Invoke-WebRequest -OutFile $dest -Uri $url"

else

curl --proto '=https' --tlsv1.2 -sSfL -o "${dest}" "${url}"

fi

}

if [[ "${OS}" == "macos" ]]; then

check_cmd shasum

else

check_cmd sha256sum

fi

function sha256() {

if [[ "${OS}" == "macos" ]]; then

shasum --algorithm 256 "$@"

else

sha256sum "$@"

fi

}

check_cmd mktemp

function install_from_url() {

local url="$1"

local dest="$2"

local workdir

workdir="$(mktemp -d)"

gc "${workdir}"

fetch "${url}.sha256" "${workdir}"

fetch "${url}" "${workdir}"

(

cd "${workdir}"

sha256 -c --status ./*.sha256 ||

die "Download from ${url} did not match the fingerprint at ${url}.sha256"

)

rm "${workdir}/"*.sha256

if [[ "${OS}" == "macos" ]]; then

mkdir -p "$(dirname "${dest}")"

install -m 755 "${workdir}/"* "${dest}"

else

install -D -m 755 "${workdir}/"* "${dest}"

fi

}

function calculate_arch() {

local arch

arch="$(uname -m)"

if [[ "${arch}" =~ x86[_-]64 ]]; then

echo x86_64

elif [[ "${arch}" =~ arm64|aarch64 ]]; then

echo aarch64

else

die "Pants is not supported for this chip architecture (${arch}). Please reach out to us at ${help_url} for help."

fi

}

check_cmd cat

function usage() {

cat << EOF

Usage: $0

Installs the pants launcher binary.

You only need to run this once on a machine when you do not have "pants"

available to run yet.

The pants binary takes care of managing and running the underlying

Pants version configured in "pants.toml" in the surrounding Pants-using

project.

Once installed, if you want to update your "pants" launcher binary, use

"SCIE_BOOT=update pants" to get the latest release or

"SCIE_BOOT=update pants --help" to learn more options.

-h | --help: Print this help message.

-d | --bin-dir:

The directory to install the scie-pants binary in, "~/.local/bin" by default.

-b | --base-name:

The name to use for the scie-pants binary, "pants" by default.

-V | --version:

The version of the scie-pants binary to install, the latest version by default.

The available versions can be seen at:

https://github.com/pantsbuild/scie-pants/releases

EOF

}

bin_dir="${HOME}/.local/bin"

base_name="pants"

version="latest/download"

while (($# > 0)); do

case "$1" in

--help | -h)

usage

exit 0

;;

--bin-dir | -d)

bin_dir="$2"

shift

;;

--base-name | -b)

base_name="$2"

shift

;;

--version | -V)

version="download/v$2"

shift

;;

*)

usage

die "Unexpected argument $1\n"

;;

esac

shift

done

ARCH="$(calculate_arch)"

URL="https://github.com/pantsbuild/scie-pants/releases/${version}/scie-pants-${OS}-${ARCH}"

dest="${bin_dir}/${base_name}"

log "Downloading and installing the pants launcher ..."

install_from_url "${URL}" "${dest}"

green "Installed the pants launcher from ${URL} to ${dest}"

if ! command -v "${base_name}" > /dev/null; then

warn "${dest} is not on the PATH."

log "You'll either need to invoke ${dest} explicitly or else add ${bin_dir} to your shell's PATH."

fi

green "\nRunning \`pants\` in a Pants-enabled repo will use the version of Pants configured for that repo."

green "In a repo not yet Pants-enabled, it will prompt you to set up Pants for that repo."