Refactor: inject the username into the source path

lib/shared/home-manager-packages.nix

@@ -2,6 +2,7 @@
   desktop,
   inputs,
   pkgs,
+  username,
   ...
 }:
 let
@@ -12,7 +13,7 @@ let
 
   _timer = writeShellApplication (import ./scripts/_timer.nix);
   export-video-list = writeShellApplication (
-    import ./scripts/export-video-list.nix { inherit pkgs; }
+    import ./scripts/export-video-list.nix { inherit pkgs username; }
   );
   notetaker = writeShellApplication (import ./scripts/notetaker.nix);
   run = writeShellApplication (import ./scripts/run.nix { inherit pkgs; });

lib/shared/scripts/export-video-list.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }:
+{ pkgs, username, ... }:
 {
   name = "export-video-list";
 
@@ -12,7 +12,7 @@
     device_name="/dev/sda2"
     device_label="UNTITLED"
 
-    source_path="/run/media/opdavies/$device_label"
+    source_path="/run/media/${username}/$device_label"
 
     # If the source path doesn't exist, try mounting the device.
     if [[ ! -d "$source_path" ]]; then