Add install sass script

dot_local/bin/executable_install-sass

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# shellcheck disable=SC1091
+source "${XDG_DATA_HOME}/buddy-up/includes/utils.sh"
+
+APP=sass
+VERSION=${VERSION:-1.79.5}
+DEST=${XDG_DATA_HOME}/apps/releases/${APP}
+
+main() (
+	URL=https://github.com/sass/dart-sass/releases/download/${VERSION}/dart-sass-${VERSION}-$(get_os)-$(get_arch).tar.gz
+	extract_tarball "${URL}" "${DEST}/${VERSION}" "--strip-component 1"
+	set_current_link "${DEST}" "${VERSION}"
+	set_link "${XDG_BIN_HOME}/${APP}" "${DEST}" "${APP}"
+)
+
+get_arch () (
+	case $(uname -m) in
+		x86_64*)    echo x64 ;;
+		*)          >&2 echo "unsupported uname: $(uname -m)"; exit 1 ;;
+	esac
+)
+
+main "${@}"