feat: add install script for bun

dot_local/bin/executable_install-bun

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# shellcheck disable=SC1091
+source "${XDG_DATA_HOME}/buddy-up/includes/utils.sh"
+
+APP=bun
+VERSION=${VERSION:-1.4.3}
+DEST=${XDG_DATA_HOME}/apps/releases/${APP}
+
+main() (
+	URL=https://github.com/oven-sh/bun/releases/download/bun-v${VERSION}/bun-$(get_os)-$(get_arch).zip
+
+	# the archive wraps everything in a bun-<os>-<arch>/ dir; -j drops it
+	extract_zip "${URL}" "${DEST}/${VERSION}" "-j"
+	set_current_link "${DEST}" "${VERSION}"
+	set_link "${XDG_BIN_HOME}/${APP}" "${DEST}" "${APP}"
+	set_link "${XDG_BIN_HOME}/bunx" "${DEST}" "${APP}"
+)
+
+get_arch() (
+	case $(uname -m) in
+	x86_64*) echo x64 ;;
+	arm64*) echo aarch64 ;;
+	aarch64*) echo aarch64 ;;
+	*)
+		echo >&2 "unsupported architecture: $(uname -m)"
+		exit 1
+		;;
+	esac
+)
+
+get_os() (
+	case $(uname -s) in
+	Linux*) echo linux ;;
+	Darwin*) echo darwin ;;
+	*)
+		echo >&2 "unsupported os: $(uname -s)"
+		exit 1
+		;;
+	esac
+)
+
+main "${@}"