Add option to enable/disable hibernation (#4103)

* Add option to enable/disable hibernation

* Actually do it

* Match hibernation toggle words

* Both enable and disable

* Match the tense

* Match options

* Remove excess CR

bin/omarchy-hibernation-setup

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# Creates a swap file in the btrfs subvolume, adds the swap file to /etc/fstab, and adds a resume hook to mkinitcpio.
+
+MEM_TOTAL_HUMAN="$(free --human |grep "Mem" |awk '{print $2}')"
+if gum confirm "Use $MEM_TOTAL_HUMAN on boot drive to make hibernation available?"; then
+  SWAP_SUBVOLUME="/swap"
+  if ! sudo btrfs subvolume show $SWAP_SUBVOLUME &>/dev/null ; then
+    echo 'Creating Btrfs subvolume'
+    sudo btrfs subvolume create "$SWAP_SUBVOLUME"
+  else
+    echo "Btrfs subvolume $SWAP_SUBVOLUME already exists"
+  fi
+
+  SWAP_FILE="$SWAP_SUBVOLUME/swapfile"
+  if ! sudo swaplabel "$SWAP_FILE" &>/dev/null; then
+    echo 'Creating swapfile in Btrfs subvolume'
+    MEM_TOTAL_KB="$(grep MemTotal /proc/meminfo | awk '{print $2}')k"
+    sudo btrfs filesystem mkswapfile -s "$MEM_TOTAL_KB" "$SWAP_FILE"
+  else
+    echo "File $SWAP_FILE already exists"
+  fi
+
+  if ! grep -Fq "$SWAP_FILE" /etc/fstab; then
+    echo "Adding swapfile to /etc/fstab"
+    sudo cp -a /etc/fstab "/etc/fstab.$(date +%Y%m%d%H%M%S).back"
+    printf "\n# Btrfs swapfile for system hibernation\n%s none swap defaults,pri=0 0 0\n" "$SWAP_FILE" | sudo tee -a /etc/fstab >/dev/null
+  else
+    echo "Swapfile $SWAP_FILE already exists in /etc/fstab"
+  fi
+
+  echo "Enabling swap on $SWAP_FILE with priority 0"
+  sudo swapon -p 0 "$SWAP_FILE"
+
+  sudo mkdir -p /etc/mkinitcpio.conf.d
+
+  MKINITCPIO_CONF="/etc/mkinitcpio.conf.d/omarchy_resume.conf"
+  HOOKS_LINE='HOOKS+=(resume)'
+  if [ ! -f "$MKINITCPIO_CONF" ] || ! grep -q "^${HOOKS_LINE}$" "$MKINITCPIO_CONF"; then
+    echo "Adding resume hooks to $MKINITCPIO_CONF"
+    echo "$HOOKS_LINE" | sudo tee -a "$MKINITCPIO_CONF" >/dev/null
+
+    echo "Regenerating initramfs..."
+    sudo limine-mkinitcpio
+    echo "Hibernation enabled"
+  else
+    echo "Hibernation hooks already enabled"
+  fi
+fi