#!/bin/sh

set -eu

repository="hmmhmmhm/tmux-attach-browser"

fail() {

printf '%s\n' "tab installer: $*" >&2

exit 1

}

command -v curl >/dev/null 2>&1 || fail "curl is required"

command -v tar >/dev/null 2>&1 || fail "tar is required"

raw_os=${TAB_OS:-$(uname -s)}

case $(printf '%s' "$raw_os" | tr '[:upper:]' '[:lower:]') in

darwin) os=darwin ;;

linux) os=linux ;;

*) fail "unsupported operating system: $raw_os" ;;

esac

raw_arch=${TAB_ARCH:-$(uname -m)}

case $(printf '%s' "$raw_arch" | tr '[:upper:]' '[:lower:]') in

x86_64 | amd64) arch=amd64 ;;

aarch64 | arm64) arch=arm64 ;;

*) fail "unsupported architecture: $raw_arch" ;;

esac

archive="tab_${os}_${arch}.tar.gz"

if [ -n "${TAB_RELEASE_BASE_URL:-}" ]; then

release_base=$TAB_RELEASE_BASE_URL

elif [ -n "${TAB_VERSION:-}" ]; then

release_base="https://github.com/$repository/releases/download/$TAB_VERSION"

else

release_base="https://github.com/$repository/releases/latest/download"

fi

install_dir=${TAB_INSTALL_DIR:-"$HOME/.local/bin"}

temporary_dir=$(mktemp -d "${TMPDIR:-/tmp}/tab-install.XXXXXX")

trap 'rm -rf "$temporary_dir"' EXIT INT TERM

curl -fsSL "$release_base/$archive" -o "$temporary_dir/$archive" || fail "could not download $archive"

curl -fsSL "$release_base/checksums.txt" -o "$temporary_dir/checksums.txt" || fail "could not download checksums.txt"

expected=$(awk -v file="$archive" '$2 == file || $2 == "*" file { print $1; exit }' "$temporary_dir/checksums.txt")

[ -n "$expected" ] || fail "checksum entry for $archive was not found"

if command -v sha256sum >/dev/null 2>&1; then

actual=$(sha256sum "$temporary_dir/$archive" | awk '{print $1}')

elif command -v shasum >/dev/null 2>&1; then

actual=$(shasum -a 256 "$temporary_dir/$archive" | awk '{print $1}')

elif command -v openssl >/dev/null 2>&1; then

actual=$(openssl dgst -sha256 "$temporary_dir/$archive" | awk '{print $NF}')

else

fail "sha256sum, shasum, or openssl is required to verify the download"

fi

[ "$actual" = "$expected" ] || fail "checksum verification failed for $archive"

tar -xzf "$temporary_dir/$archive" -C "$temporary_dir" tab || fail "could not extract tab"

mkdir -p "$install_dir"

if command -v install >/dev/null 2>&1; then

install -m 0755 "$temporary_dir/tab" "$install_dir/tab"

else

cp "$temporary_dir/tab" "$install_dir/tab"

chmod 0755 "$install_dir/tab"

fi

printf '%s\n' "Installed tab to $install_dir/tab"

case ":${PATH:-}:" in

*":$install_dir:"*) ;;

*) printf '%s\n' "Add $install_dir to PATH to run tab from any directory." ;;

esac

if ! command -v tmux >/dev/null 2>&1; then

printf '%s\n' "tmux was not found. Install tmux before running tab." >&2

fi