[feat] nvim: add custom vim plugin management

Use vimPluginsUpdater to keep extra plugins up to date

Fixes #4

justfile

@@ -11,6 +11,25 @@ build-vm:
 run-vm: build-vm
     QEMU_OPTS="$QEMU_OPTS_WL" result/bin/run-nixos-vm
 
+update-vim-plugins:
+    #!/bin/sh
+    # Use local nixpkgs if available
+    nixpkgs="$HOME/Dev/nixpkgs"
+    # copy nixpkgs from local checkout
+    if [ ! -d "$nixpkgs" ]; then
+        nixpkgs="$(mktemp -d)"
+        cp -r /nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/. "$nixpkgs"
+        cd "$nixpkgs"
+        git init .
+        git add .
+        git commit -m 'dummy commit'
+        cd -
+    fi
+    # update vim plugins
+    nix run nixpkgs#vimPluginsUpdater -- --nixpkgs "$nixpkgs" --no-commit -i ./nvim/extraPlugins/plugins -o ./nvim/extraPlugins/generated.nix update
+    # format the generated output
+    nix fmt ./nvim/extraPlugins/generated.nix
+
 # Amend Update flake.lock PR
 flake-pr:
     git branch -D update_flake_lock_action || echo "no previous update branch"