fix: support arm64 macs in install-sass

get_arch only handled x86_64, so arm64 machines hit "unsupported
uname: arm64" before any download was attempted. Also add a local
get_os override: dart-sass names its macOS assets "macos-*", but the
shared get_os helper returns "darwin", which 404s.

dot_local/bin/executable_install-lua-language-server

@@ -13,12 +13,23 @@ main() (
 
 	extract_tarball "${URL}" "${DEST}/${VERSION}"
 	set_current_link "${DEST}" "${VERSION}"
-	set_link "${XDG_BIN_HOME}/lua-language-server" "${DEST}" bin/lua-language-server
+
+	# lua-language-server locates main.lua next to its own argv[0], without
+	# resolving symlinks, so it can't be launched through a symlinked
+	# executable (only a symlinked directory in the path works). Use a
+	# wrapper script instead of set_link.
+	cat >"${XDG_BIN_HOME}/lua-language-server" <<EOF
+#!/usr/bin/env bash
+exec "${DEST}/current/bin/lua-language-server" "\$@"
+EOF
+	chmod +x "${XDG_BIN_HOME}/lua-language-server"
 )
 
 get_arch() (
 	case $(uname -m) in
 	x86_64*) echo x64 ;;
+	arm64*) echo arm64 ;;
+	aarch64*) echo arm64 ;;
 	*)
 		echo >&2 "unsupported architecture: $(uname -m)"
 		exit 1

dot_local/bin/executable_install-sass

@@ -19,8 +19,18 @@ main() (
 get_arch () (
 	case $(uname -m) in
 		x86_64*)    echo x64 ;;
+		arm64*)     echo arm64 ;;
+		aarch64*)   echo arm64 ;;
 		*)          >&2 echo "unsupported uname: $(uname -m)"; exit 1 ;;
 	esac
 )
 
+get_os () (
+	case $(uname -s) in
+		Linux*)     echo linux ;;
+		Darwin*)    echo macos ;;
+		*)          >&2 echo "unsupported os: $(uname -s)"; exit 1 ;;
+	esac
+)
+
 main "${@}"