feat: add the ability to (un)hide the GRUB screen

This was taken from this repository: https://github.com/fiftydinar/gidro-os/blob/af9010990f2a6b8fd43dc46de96785f6e8f30bc7/config/files/usr/share/ublue-os/just/60-custom.just

config/files/usr/share/ublue-os/just/60-custom.just

@@ -9,4 +9,46 @@ install-pdm:
     curl -sSL https://pdm-project.org/install-pdm.py.sha256 | sha256sum -c -
     HOMEDIR=$( getent passwd "$USER" | cut -d: -f6 )
     python3 install-pdm.py --path "${HOMEDIR}/pdm"
-    rm install-pdm.py
+    rm install-pdm.py
+
+# Configure GRUB screen with various options
+configure-grub ACTION="prompt":
+    #!/usr/bin/env bash
+    bold=$(tput bold)
+    normal=$(tput sgr0)
+    OPTION={{ ACTION }}
+    if [ "$OPTION" == "prompt" ]; then
+    echo "${bold}Configuring GRUB${normal}"
+    echo 'GRUB hiding option can be useful for making boot-times faster.'
+    echo 'Hide or Unhide GRUB? Press ESC to exit.'
+    OPTION=$(ugum choose "Unhide (Default)" Hide)
+    elif [ "$OPTION" == "help" ]; then
+      echo "Usage: ujust configure-grub <option>"
+      echo "  <option>: Specify the quick option - 'hide' or 'unhide'"
+      echo "  Use 'hide' to hide GRUB boot screen."
+      echo "  Use 'unhide' to revert to defaults."
+      exit 0
+    fi    
+    if [ "${OPTION,,}" == "hide" ]; then
+      sudo sed -i 's/GRUB_TIMEOUT=5/GRUB_TIMEOUT=0/g' /etc/default/grub
+      output=$(echo 'GRUB_TIMEOUT_STYLE=hidden' | sudo tee -a /etc/default/grub 2>&1) || echo "$output" && false
+      output=$(echo 'GRUB_HIDDEN_TIMEOUT=1' | sudo tee -a /etc/default/grub 2>&1) || echo "$output" && false
+      if [ -d /sys/firmware/efi ]; then
+        output=$(sudo grub2-mkconfig -o /etc/grub2-efi.cfg 2>&1) || echo "$output" && false
+            echo 'Hide UEFI GRUB logs during boot setting applied.'  
+      else
+        output=$(sudo grub2-mkconfig -o /etc/grub2.cfg 2>&1) || echo "$output" && false
+            echo 'Hide BIOS GRUB logs during boot setting applied.'   
+      fi
+    elif [ "$OPTION" == "Unhide (Default)" ] || [ "${OPTION,,}" == "unhide" ]; then
+      sudo sed -i '/GRUB_HIDDEN_TIMEOUT=1/d' /etc/default/grub
+      sudo sed -i '/GRUB_TIMEOUT_STYLE=hidden/d' /etc/default/grub
+      sudo sed -i 's/GRUB_TIMEOUT=0/GRUB_TIMEOUT=5/g' /etc/default/grub
+      if [ -d /sys/firmware/efi ]; then
+        output=$(sudo grub2-mkconfig -o /etc/grub2-efi.cfg 2>&1) || echo "$output" && false
+            echo 'Reverted setting "UEFI GRUB logs during boot" to defaults.'  
+      else
+        output=$(sudo grub2-mkconfig -o /etc/grub2.cfg 2>&1) || echo "$output" && false
+            echo 'Reverted setting "BIOS GRUB logs during boot" to defaults.'   
+      fi
+    fi