improve upgrades script usability

.local/bin/upgrades

@@ -1,13 +1,19 @@
 #!/bin/sh
 
-st -e sh -c "
-    sudo xbps-install -Syu
-
-    pkill -RTMIN+8 dwmblocks
+read -r script<<EOF
+sudo xbps-install -Su
+pkill -RTMIN+8 dwmblocks
+EOF
 
+if [ -n "$TERM_PROGRAM" ]; then
+    $script
+else
+    st -e sh -c "
+        $script
         tput bold
         tput setaf 4
         echo 'All done!'
         tput sgr 0
         read -r _
-"
+    "
+fi