Add deliver script

Based on Jess Archer's script, this executes a command within a
specified Docker Compose service or, if no matching one is not found,
will execute it locally.

lib/shared/home-manager-packages.nix

@@ -15,6 +15,7 @@ let
   create-zellij-session = writeShellApplication (
     import ./scripts/create-zellij-session.nix { inherit pkgs; }
   );
+  deliver = writeShellApplication (import ./scripts/deliver.nix { inherit pkgs; });
   export-video-list = writeShellApplication (
     import ./scripts/export-video-list.nix { inherit pkgs username; }
   );
@@ -70,6 +71,7 @@ with pkgs;
 
   # Scripts.
   create-zellij-session
+  deliver
   notetaker
   run
   t

lib/shared/scripts/deliver.nix

@@ -0,0 +1,25 @@
+{ pkgs }:
+{
+  name = "deliver";
+
+  runtimeInputs = with pkgs; [ docker ];
+
+  text = ''
+    set +o pipefail
+
+    # Based on https://github.com/jessarcher/dotfiles/blob/ef692c35d64db2c13674dfc850a23b6acf9e8f91/scripts/deliver.
+
+    docker_compose_service_name=$(docker compose ps --services 2>/dev/null | grep '^app\|php$' | head -n1)
+
+    if [[ "$docker_compose_service_name" != "" ]]; then
+      if [ -t 1 ]; then
+        "${pkgs.docker}/bin/docker" compose exec "$docker_compose_service_name" "$@"
+      else
+        # The command is not being run in a TTY
+        "${pkgs.docker}/bin/docker" compose exec -T "$docker_compose_service_name" "$@"
+      fi
+    else
+      "$@"
+    fi
+  '';
+}