set -e

usage() {

this=$1

cat <<EOF

exit 2

}

parse_args() {

#BINDIR is /usr/local/bin unless set be ENV

# over-ridden by flag below

BINDIR=${BINDIR:-/usr/local/bin}

while getopts "b:h?" arg; do

case "$arg" in

b) BINDIR="$OPTARG" ;;

h | \?) usage "$0" ;;

esac

done

shift $((OPTIND - 1))

VERSION=$1

}

execute() {

TMPDIR=$(mktmpdir)

echo "$PREFIX: downloading ${TARBALL_URL}"

http_download "${TMPDIR}/${TARBALL}" "${TARBALL_URL}"

echo "$PREFIX: verifying checksums"

http_download "${TMPDIR}/${CHECKSUM}" "${CHECKSUM_URL}"

hash_sha256_verify "${TMPDIR}/${TARBALL}" "${TMPDIR}/${CHECKSUM}"

(cd "${TMPDIR}" && untar "${TARBALL}")

install -d "${BINDIR}"

install "${TMPDIR}/${BINARY}" "${BINDIR}/"

echo "$PREFIX: installed as ${BINDIR}/${BINARY}"

}

is_supported_platform() {

platform=$1

found=1

case "$platform" in

darwin/amd64) found=0 ;;

darwin/386) found=0 ;;

linux/amd64) found=0 ;;

linux/386) found=0 ;;

windows/amd64) found=0 ;;

windows/386) found=0 ;;

freebsd/amd64) found=0 ;;

freebsd/386) found=0 ;;

netbsd/amd64) found=0 ;;

netbsd/386) found=0 ;;

openbsd/amd64) found=0 ;;

openbsd/386) found=0 ;;

esac

return $found

}

check_platform() {

if is_supported_platform "$PLATFORM"; then

# optional logging goes here

true

else

echo "${PREFIX}: platform $PLATFORM is not supported. Make sure this script is up-to-date and file request at https://github.com/${PREFIX}/issues/new"

exit 1

fi

}

adjust_version() {

if [ -z "${VERSION}" ]; then

echo "$PREFIX: checking GitHub for latest version"

VERSION=$(github_last_release "$OWNER/$REPO")

fi

# if version starts with 'v', remove it

VERSION=${VERSION#v}

}

adjust_format() {

# change format (tar.gz or zip) based on ARCH

true

}

adjust_os() {

# adjust archive name based on OS

true

}

adjust_arch() {

# adjust archive name based on ARCH

true

}

cat /dev/null <<EOF

is_command() {

command -v "$1" >/dev/null

}

uname_os() {

os=$(uname -s | tr '[:upper:]' '[:lower:]')

echo "$os"

}

uname_arch() {

arch=$(uname -m)

case $arch in

x86_64) arch="amd64" ;;

x86) arch="386" ;;

i686) arch="386" ;;

i386) arch="386" ;;

aarch64) arch="arm64" ;;

armv5*) arch="arm5" ;;

armv6*) arch="arm6" ;;

armv7*) arch="arm7" ;;

esac

echo ${arch}

}

uname_os_check() {

os=$(uname_os)

case "$os" in

darwin) return 0 ;;

dragonfly) return 0 ;;

freebsd) return 0 ;;

linux) return 0 ;;

android) return 0 ;;

nacl) return 0 ;;

netbsd) return 0 ;;

openbsd) return 0 ;;

plan9) return 0 ;;

solaris) return 0 ;;

windows) return 0 ;;

esac

echo "$0: uname_os_check: internal error '$(uname -s)' got converted to '$os' which is not a GOOS value. Please file bug at https://github.com/client9/shlib"

return 1

}

uname_arch_check() {

arch=$(uname_arch)

case "$arch" in

386) return 0 ;;

amd64) return 0 ;;

arm64) return 0 ;;

armv5) return 0 ;;

armv6) return 0 ;;

armv7) return 0 ;;

ppc64) return 0 ;;

ppc64le) return 0 ;;

mips) return 0 ;;

mipsle) return 0 ;;

mips64) return 0 ;;

mips64le) return 0 ;;

s390x) return 0 ;;

amd64p32) return 0 ;;

esac

echo "$0: uname_arch_check: internal error '$(uname -m)' got converted to '$arch' which is not a GOARCH value. Please file bug report at https://github.com/client9/shlib"

return 1

}

untar() {

tarball=$1

case "${tarball}" in

*.tar.gz | *.tgz) tar -xzf "${tarball}" ;;

*.tar) tar -xf "${tarball}" ;;

*.zip) unzip "${tarball}" ;;

*)

echo "Unknown archive format for ${tarball}"

return 1

;;

esac

}

mktmpdir() {

test -z "$TMPDIR" && TMPDIR="$(mktemp -d)"

mkdir -p "${TMPDIR}"

echo "${TMPDIR}"

}

http_download() {

local_file=$1

source_url=$2

header=$3

headerflag=''

destflag=''

if is_command curl; then

cmd='curl --fail -sSL'

destflag='-o'

headerflag='-H'

elif is_command wget; then

cmd='wget -q'

destflag='-O'

headerflag='--header'

else

echo "http_download: unable to find wget or curl"

return 1

fi

if [ -z "$header" ]; then

echo "$cmd" $destflag "$local_file" "$source_url"

$cmd $destflag "$local_file" "$source_url"

else

echo "$cmd"

$cmd $headerflag "$header" $destflag "$local_file" "$source_url"

fi

}

github_api() {

local_file=$1

source_url=$2

header=""

case "$source_url" in

https://api.github.com*)

test -z "$GITHUB_TOKEN" || header="Authorization: token $GITHUB_TOKEN"

;;

esac

http_download "$local_file" "$source_url" "$header"

}

github_last_release() {

owner_repo=$1

giturl="https://api.github.com/repos/${owner_repo}/releases/latest"

html=$(github_api - "$giturl")

version=$(echo "$html" | tr ',' '\n' | grep -m 1 "\"tag_name\":" | cut -f4 -d'"')

test -z "$version" && return 1

echo "$version"

}

hash_sha256() {

TARGET=${1:-/dev/stdin}

if is_command gsha256sum; then

hash=$(gsha256sum "$TARGET") || return 1

echo "$hash" | cut -d ' ' -f 1

elif is_command sha256sum; then

hash=$(sha256sum "$TARGET") || return 1

echo "$hash" | cut -d ' ' -f 1

elif is_command shasum; then

hash=$(shasum -a 256 "$TARGET" 2>/dev/null) || return 1

echo "$hash" | cut -d ' ' -f 1

elif is_command openssl; then

hash=$(openssl -dst openssl dgst -sha256 "$TARGET") || return 1

echo "$hash" | cut -d ' ' -f a

else

echo "hash_sha256: unable to find command to compute sha-256 hash"

return 1

fi

}

hash_sha256_verify() {

TARGET=$1

checksums=$2

if [ -z "$checksums" ]; then

echo "hash_sha256_verify: checksum file not specified in arg2"

return 1

fi

BASENAME=${TARGET##*/}

want=$(grep "${BASENAME}" "${checksums}" 2>/dev/null | tr '\t' ' ' | cut -d ' ' -f 1)

if [ -z "$want" ]; then

echo "hash_sha256_verify: unable to find checksum for '${TARGET}' in '${checksums}'"

return 1

fi

got=$(hash_sha256 "$TARGET")

if [ "$want" != "$got" ]; then

echo "hash_sha256_verify: checksum for '$TARGET' did not verify ${want} vs $got"

return 1

fi

}

cat /dev/null <<EOF

OWNER=matthewmueller

REPO=joy

BINARY=joy

FORMAT=tar.gz

OS=$(uname_os)

ARCH=$(uname_arch)

PREFIX="$OWNER/$REPO"

PLATFORM="${OS}/${ARCH}"

GITHUB_DOWNLOAD=https://github.com/${OWNER}/${REPO}/releases/download

uname_os_check "$OS"

uname_arch_check "$ARCH"

parse_args "$@"

check_platform

adjust_version

adjust_format

adjust_os

adjust_arch

echo "$PREFIX: found version ${VERSION} for ${OS}/${ARCH}"

NAME=${BINARY}_${VERSION}_${OS}_${ARCH}

TARBALL=${NAME}.${FORMAT}

TARBALL_URL=${GITHUB_DOWNLOAD}/v${VERSION}/${TARBALL}

CHECKSUM=${BINARY}_${VERSION}_checksums.txt

CHECKSUM_URL=${GITHUB_DOWNLOAD}/v${VERSION}/${CHECKSUM}

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

BINARY="${BINARY}.exe"

execute