Improve the lock screen command

Running a screensaver is a very important security feature.
It is necessary that it always works and does not depend on the
state of the user's directories, so the screensaver run-script
should be placed in the system directory.
However, the locking process remains customizable because the user
script can be used too.

etc/skel/.config/nwg-bar/bar.json

@@ -1,7 +1,7 @@
 [
  {
    "label": "Lock",
-   "exec": "swaymsg exec ~/.config/swaylock/lock.sh",
+   "exec": "swaymsg exec /usr/share/sway/scripts/lock.sh",
    "icon": "system-lock-screen"
  },
  {

etc/skel/.config/swayidle/config

@@ -1,7 +1,7 @@
 timeout 240 'light -G > /tmp/brightness && light -S 10' resume 'light -S $([ -f /tmp/brightness ] && cat /tmp/brightness || echo 100%)'
-timeout 300 ~/.config/swaylock/lock.sh
+timeout 300 '/usr/share/sway/scripts/lock.sh'
 timeout 600 'swaymsg "output * power off"' resume 'swaymsg "output * power on"'
 timeout 900 'systemctl suspend'
 before-sleep 'playerctl pause'
-before-sleep ~/.config/swaylock/lock.sh
-lock ~/.config/swaylock/lock.sh
+before-sleep '/usr/share/sway/scripts/lock.sh'
+lock '/usr/share/sway/scripts/lock.sh'

usr/share/sway/scripts/lock.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+USER_SCRIPT="$HOME/.config/swaylock/lock.sh"
+GLOB_SCRIPT="/usr/share/sway/scripts/swaylock.sh"
+
+if [[ -x "$USER_SCRIPT" ]]; then
+    "$USER_SCRIPT"
+else 
+    "$GLOB_SCRIPT"
+fi