auto-shellcheck and shfmt at the script end

setup-mac.sh

@@ -116,7 +116,7 @@ if [ ! -e /Applications/WezTerm.app ]; then
   install_latest_wezterm
 else
   current_wezterm=$(/Applications/WezTerm.app/Contents/MacOS/wezterm -V | awk '{print $2}')
-  if ! echo $LATEST_WEZTERM | grep "$current_wezterm"; then
+  if ! echo "$LATEST_WEZTERM" | grep "$current_wezterm" >/dev/null; then
     install_latest_wezterm
   fi
 fi
@@ -319,3 +319,6 @@ install_typst() {
 }
 
 [ -e "/usr/local/bin/typst" ] || install_typst
+
+shellcheck "$0" || exit 1
+shfmt -i 2 -d -s "$0"