Purify &rtp and &;packpath

[shofel]

Context: default rtp and packpath are

1. enormous, and contain lots of non-sense empty directories
2. including ~/.config/nvim, which means our nvim derivation will be affected by the user's config. With the purity mindset it feels like a bug

packpath

/nix/store/l2bx2if0r7qlw289mhn1g8xsfjairm7k-vim-pack-dir
/home/slava/.config/nvim
/etc/xdg/nvim
/home/slava/.nix-profile/etc/xdg/nvim
/nix/profile/etc/xdg/nvim
/home/slava/.local/state/nix/profile/etc/xdg/nvim
/etc/profiles/per-user/slava/etc/xdg/nvim
/nix/var/nix/profiles/default/etc/xdg/nvim
/run/current-system/sw/etc/xdg/nvim
/nix/store/qvpmfwqfigj1y1jqpdz075ycxgqkhdw5-gnome-settings-daemon-47.2/etc/xdg/nvim
/home/slava/.local/share/nvim/site
/nix/store/xbmxsi30r2wb218cb4vk4mm09rim7ba2-shared-mime-info-2.4/share/nvim/site
/nix/store/clnhjv6bgx4794ckarqggwjfj9b71qkz-gnome-shell-47.2/share/nvim/site
/nix/store/jmmq8mgh6y3milc6k3pvhyb7yw8sz89d-gsettings-desktop-schemas-47.1/share/gsettings-schemas/gsettings-desktop-schemas-47.1/nvim/site
/nix/store/dp2c6lh3mj8kx1l1520ackwjw8y9r400-gtk4-4.16.3/share/gsettings-schemas/gtk4-4.16.3/nvim/site
/nix/store/i9z2s9039rsaq8rrk7z9m586a4h4jhwi-gnome-keyring-46.2/share/gsettings-schemas/gnome-keyring-46.2/nvim/site
/nix/store/w2v6kx9xq4ajlgbccgs2h7k5jv6hggn6-mutter-47.3/share/gsettings-schemas/mutter-47.3/nvim/site
/nix/store/69vb12g2nz47j87zin6mjv2i6rkqvnh1-evolution-data-server-3.54.2/share/gsettings-schemas/evolution-data-server-3.54.2/nvim/site
/nix/store/npr7ixa44569fyidvlpgvxqcaxhmvdx1-gdm-47.0/share/gsettings-schemas/gdm-47.0/nvim/site
/nix/store/jqk8mbbricp8hapjjb5w6vmlfg80n026-gnome-clocks-47.0/share/gsettings-schemas/gnome-clocks-47.0/nvim/site
/nix/store/kppmhfi2wadmrz3yqr42619v141q98ih-ibus-1.5.30/share/gsettings-schemas/ibus-1.5.30/nvim/site
/nix/store/qvpmfwqfigj1y1jqpdz075ycxgqkhdw5-gnome-settings-daemon-47.2/share/gsettings-schemas/gnome-settings-daemon-47.2/nvim/site
/nix/store/xpv0fmpvkq264pkc8x4kcwn7vrrxsjhf-pipewire-1.2.6/share/gsettings-schemas/pipewire-1.2.6/nvim/site
/nix/store/cbpsq5za7cxsx313m3h69q4hszc0qmvk-libgweather-4.4.4/share/gsettings-schemas/libgweather-4.4.4/nvim/site
/nix/store/9yg8b25s9jkn95h49hml6n670gx2w6bc-libnma-1.10.6/share/gsettings-schemas/libnma-1.10.6/nvim/site
/nix/store/clnhjv6bgx4794ckarqggwjfj9b71qkz-gnome-shell-47.2/share/gsettings-schemas/gnome-shell-47.2/nvim/site
/nix/store/a7q0p7i5f8vcwvjanh1990faxcdynm91-gnome-mimeapps/share/nvim/site
/nix/store/qpb6y4y9bk1f9ql12qba5h5f96zk97zs-desktops/share/nvim/site
/home/slava/.nix-profile/share/nvim/site
/nix/profile/share/nvim/site
/home/slava/.local/state/nix/profile/share/nvim/site
/etc/profiles/per-user/slava/share/nvim/site
/nix/var/nix/profiles/default/share/nvim/site
/run/current-system/sw/share/nvim/site
/nix/store/606xjgzri7lk4g214a0kf38ffaak74da-gnome-shell-extensions-47.2/share/gsettings-schemas/gnome-shell-extensions-47.2/nvim/site
/nix/store/w7v95bmbsbiygzh6bxhg93d7l1g6i3a9-gnome-session-47.0.1/share/nvim/site
/nix/store/8cw08cgb87bpyzbqrk9pwb1fj7lfyxql-gtk+3-3.24.43/share/gsettings-schemas/gtk+3-3.24.43/nvim/site
/nix/store/w7v95bmbsbiygzh6bxhg93d7l1g6i3a9-gnome-session-47.0.1/share/gsettings-schemas/gnome-session-47.0.1/nvim/site
/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/share/nvim/runtime
/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/lib/nvim
/nix/store/w7v95bmbsbiygzh6bxhg93d7l1g6i3a9-gnome-session-47.0.1/share/gsettings-schemas/gnome-session-47.0.1/nvim/site/after
/nix/store/8cw08cgb87bpyzbqrk9pwb1fj7lfyxql-gtk+3-3.24.43/share/gsettings-schemas/gtk+3-3.24.43/nvim/site/after
/nix/store/w7v95bmbsbiygzh6bxhg93d7l1g6i3a9-gnome-session-47.0.1/share/nvim/site/after
/nix/store/606xjgzri7lk4g214a0kf38ffaak74da-gnome-shell-extensions-47.2/share/gsettings-schemas/gnome-shell-extensions-47.2/nvim/site/after
/run/current-system/sw/share/nvim/site/after
/nix/var/nix/profiles/default/share/nvim/site/after
/etc/profiles/per-user/slava/share/nvim/site/after
/home/slava/.local/state/nix/profile/share/nvim/site/after
/nix/profile/share/nvim/site/after
/home/slava/.nix-profile/share/nvim/site/after
/nix/store/qpb6y4y9bk1f9ql12qba5h5f96zk97zs-desktops/share/nvim/site/after
/nix/store/a7q0p7i5f8vcwvjanh1990faxcdynm91-gnome-mimeapps/share/nvim/site/after
/nix/store/clnhjv6bgx4794ckarqggwjfj9b71qkz-gnome-shell-47.2/share/gsettings-schemas/gnome-shell-47.2/nvim/site/after
/nix/store/9yg8b25s9jkn95h49hml6n670gx2w6bc-libnma-1.10.6/share/gsettings-schemas/libnma-1.10.6/nvim/site/after
/nix/store/cbpsq5za7cxsx313m3h69q4hszc0qmvk-libgweather-4.4.4/share/gsettings-schemas/libgweather-4.4.4/nvim/site/after
/nix/store/xpv0fmpvkq264pkc8x4kcwn7vrrxsjhf-pipewire-1.2.6/share/gsettings-schemas/pipewire-1.2.6/nvim/site/after
/nix/store/qvpmfwqfigj1y1jqpdz075ycxgqkhdw5-gnome-settings-daemon-47.2/share/gsettings-schemas/gnome-settings-daemon-47.2/nvim/site/after
/nix/store/kppmhfi2wadmrz3yqr42619v141q98ih-ibus-1.5.30/share/gsettings-schemas/ibus-1.5.30/nvim/site/after
/nix/store/jqk8mbbricp8hapjjb5w6vmlfg80n026-gnome-clocks-47.0/share/gsettings-schemas/gnome-clocks-47.0/nvim/site/after
/nix/store/npr7ixa44569fyidvlpgvxqcaxhmvdx1-gdm-47.0/share/gsettings-schemas/gdm-47.0/nvim/site/after
/nix/store/69vb12g2nz47j87zin6mjv2i6rkqvnh1-evolution-data-server-3.54.2/share/gsettings-schemas/evolution-data-server-3.54.2/nvim/site/after
/nix/store/w2v6kx9xq4ajlgbccgs2h7k5jv6hggn6-mutter-47.3/share/gsettings-schemas/mutter-47.3/nvim/site/after
/nix/store/i9z2s9039rsaq8rrk7z9m586a4h4jhwi-gnome-keyring-46.2/share/gsettings-schemas/gnome-keyring-46.2/nvim/site/after
/nix/store/dp2c6lh3mj8kx1l1520ackwjw8y9r400-gtk4-4.16.3/share/gsettings-schemas/gtk4-4.16.3/nvim/site/after
/nix/store/jmmq8mgh6y3milc6k3pvhyb7yw8sz89d-gsettings-desktop-schemas-47.1/share/gsettings-schemas/gsettings-desktop-schemas-47.1/nvim/site/after
/nix/store/clnhjv6bgx4794ckarqggwjfj9b71qkz-gnome-shell-47.2/share/nvim/site/after
/nix/store/xbmxsi30r2wb218cb4vk4mm09rim7ba2-shared-mime-info-2.4/share/nvim/site/after
/home/slava/.local/share/nvim/site/after
/nix/store/qvpmfwqfigj1y1jqpdz075ycxgqkhdw5-gnome-settings-daemon-47.2/etc/xdg/nvim/after
/run/current-system/sw/etc/xdg/nvim/after
/nix/var/nix/profiles/default/etc/xdg/nvim/after
/etc/profiles/per-user/slava/etc/xdg/nvim/after
/home/slava/.local/state/nix/profile/etc/xdg/nvim/after
/nix/profile/etc/xdg/nvim/after
/home/slava/.nix-profile/etc/xdg/nvim/after
/etc/xdg/nvim/after
/home/slava/.config/nvim/after

rtp

/nix/store/1cmabr17qng20b1svz19ffcq39hv6frv-neovim-config
/nix/store/l2bx2if0r7qlw289mhn1g8xsfjairm7k-vim-pack-dir
/nix/store/l2bx2if0r7qlw289mhn1g8xsfjairm7k-vim-pack-dir/pack/myNeovimPackages/opt/noice.nvim
/nix/store/l2bx2if0r7qlw289mhn1g8xsfjairm7k-vim-pack-dir/pack/myNeovimPackages/opt/guess-indent.nvim
/nix/store/l2bx2if0r7qlw289mhn1g8xsfjairm7k-vim-pack-dir/pack/myNeovimPackages/opt/neorg
/nix/store/l2bx2if0r7qlw289mhn1g8xsfjairm7k-vim-pack-dir/pack/myNeovimPackages/opt/fzf-lua
/nix/store/l2bx2if0r7qlw289mhn1g8xsfjairm7k-vim-pack-dir/pack/*/start/*
/home/slava/.config/nvim
/etc/xdg/nvim
/home/slava/.nix-profile/etc/xdg/nvim
/nix/profile/etc/xdg/nvim
/home/slava/.local/state/nix/profile/etc/xdg/nvim
/etc/profiles/per-user/slava/etc/xdg/nvim
/nix/var/nix/profiles/default/etc/xdg/nvim
/run/current-system/sw/etc/xdg/nvim
/nix/store/qvpmfwqfigj1y1jqpdz075ycxgqkhdw5-gnome-settings-daemon-47.2/etc/xdg/nvim
/home/slava/.local/share/nvim/site
/nix/store/xbmxsi30r2wb218cb4vk4mm09rim7ba2-shared-mime-info-2.4/share/nvim/site
/nix/store/clnhjv6bgx4794ckarqggwjfj9b71qkz-gnome-shell-47.2/share/nvim/site
/nix/store/jmmq8mgh6y3milc6k3pvhyb7yw8sz89d-gsettings-desktop-schemas-47.1/share/gsettings-schemas/gsettings-desktop-schemas-47.1/nvim/site
/nix/store/dp2c6lh3mj8kx1l1520ackwjw8y9r400-gtk4-4.16.3/share/gsettings-schemas/gtk4-4.16.3/nvim/site
/nix/store/i9z2s9039rsaq8rrk7z9m586a4h4jhwi-gnome-keyring-46.2/share/gsettings-schemas/gnome-keyring-46.2/nvim/site
/nix/store/w2v6kx9xq4ajlgbccgs2h7k5jv6hggn6-mutter-47.3/share/gsettings-schemas/mutter-47.3/nvim/site
/nix/store/69vb12g2nz47j87zin6mjv2i6rkqvnh1-evolution-data-server-3.54.2/share/gsettings-schemas/evolution-data-server-3.54.2/nvim/site
/nix/store/npr7ixa44569fyidvlpgvxqcaxhmvdx1-gdm-47.0/share/gsettings-schemas/gdm-47.0/nvim/site
/nix/store/jqk8mbbricp8hapjjb5w6vmlfg80n026-gnome-clocks-47.0/share/gsettings-schemas/gnome-clocks-47.0/nvim/site
/nix/store/kppmhfi2wadmrz3yqr42619v141q98ih-ibus-1.5.30/share/gsettings-schemas/ibus-1.5.30/nvim/site
/nix/store/qvpmfwqfigj1y1jqpdz075ycxgqkhdw5-gnome-settings-daemon-47.2/share/gsettings-schemas/gnome-settings-daemon-47.2/nvim/site
/nix/store/xpv0fmpvkq264pkc8x4kcwn7vrrxsjhf-pipewire-1.2.6/share/gsettings-schemas/pipewire-1.2.6/nvim/site
/nix/store/cbpsq5za7cxsx313m3h69q4hszc0qmvk-libgweather-4.4.4/share/gsettings-schemas/libgweather-4.4.4/nvim/site
/nix/store/9yg8b25s9jkn95h49hml6n670gx2w6bc-libnma-1.10.6/share/gsettings-schemas/libnma-1.10.6/nvim/site
/nix/store/clnhjv6bgx4794ckarqggwjfj9b71qkz-gnome-shell-47.2/share/gsettings-schemas/gnome-shell-47.2/nvim/site
/nix/store/a7q0p7i5f8vcwvjanh1990faxcdynm91-gnome-mimeapps/share/nvim/site
/nix/store/qpb6y4y9bk1f9ql12qba5h5f96zk97zs-desktops/share/nvim/site
/home/slava/.nix-profile/share/nvim/site
/nix/profile/share/nvim/site
/home/slava/.local/state/nix/profile/share/nvim/site
/etc/profiles/per-user/slava/share/nvim/site
/nix/var/nix/profiles/default/share/nvim/site
/run/current-system/sw/share/nvim/site
/nix/store/606xjgzri7lk4g214a0kf38ffaak74da-gnome-shell-extensions-47.2/share/gsettings-schemas/gnome-shell-extensions-47.2/nvim/site
/nix/store/w7v95bmbsbiygzh6bxhg93d7l1g6i3a9-gnome-session-47.0.1/share/nvim/site
/nix/store/8cw08cgb87bpyzbqrk9pwb1fj7lfyxql-gtk+3-3.24.43/share/gsettings-schemas/gtk+3-3.24.43/nvim/site
/nix/store/w7v95bmbsbiygzh6bxhg93d7l1g6i3a9-gnome-session-47.0.1/share/gsettings-schemas/gnome-session-47.0.1/nvim/site
/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/share/nvim/runtime
/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/share/nvim/runtime/pack/dist/opt/matchit
/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/share/nvim/runtime/pack/dist/opt/cfilter
/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/lib/nvim
/nix/store/w7v95bmbsbiygzh6bxhg93d7l1g6i3a9-gnome-session-47.0.1/share/gsettings-schemas/gnome-session-47.0.1/nvim/site/after
/nix/store/8cw08cgb87bpyzbqrk9pwb1fj7lfyxql-gtk+3-3.24.43/share/gsettings-schemas/gtk+3-3.24.43/nvim/site/after
/nix/store/w7v95bmbsbiygzh6bxhg93d7l1g6i3a9-gnome-session-47.0.1/share/nvim/site/after
/nix/store/606xjgzri7lk4g214a0kf38ffaak74da-gnome-shell-extensions-47.2/share/gsettings-schemas/gnome-shell-extensions-47.2/nvim/site/after
/run/current-system/sw/share/nvim/site/after
/nix/var/nix/profiles/default/share/nvim/site/after
/etc/profiles/per-user/slava/share/nvim/site/after
/home/slava/.local/state/nix/profile/share/nvim/site/after
/nix/profile/share/nvim/site/after
/home/slava/.nix-profile/share/nvim/site/after
/nix/store/qpb6y4y9bk1f9ql12qba5h5f96zk97zs-desktops/share/nvim/site/after
/nix/store/a7q0p7i5f8vcwvjanh1990faxcdynm91-gnome-mimeapps/share/nvim/site/after
/nix/store/clnhjv6bgx4794ckarqggwjfj9b71qkz-gnome-shell-47.2/share/gsettings-schemas/gnome-shell-47.2/nvim/site/after
/nix/store/9yg8b25s9jkn95h49hml6n670gx2w6bc-libnma-1.10.6/share/gsettings-schemas/libnma-1.10.6/nvim/site/after
/nix/store/cbpsq5za7cxsx313m3h69q4hszc0qmvk-libgweather-4.4.4/share/gsettings-schemas/libgweather-4.4.4/nvim/site/after
/nix/store/xpv0fmpvkq264pkc8x4kcwn7vrrxsjhf-pipewire-1.2.6/share/gsettings-schemas/pipewire-1.2.6/nvim/site/after
/nix/store/qvpmfwqfigj1y1jqpdz075ycxgqkhdw5-gnome-settings-daemon-47.2/share/gsettings-schemas/gnome-settings-daemon-47.2/nvim/site/after
/nix/store/kppmhfi2wadmrz3yqr42619v141q98ih-ibus-1.5.30/share/gsettings-schemas/ibus-1.5.30/nvim/site/after
/nix/store/jqk8mbbricp8hapjjb5w6vmlfg80n026-gnome-clocks-47.0/share/gsettings-schemas/gnome-clocks-47.0/nvim/site/after
/nix/store/npr7ixa44569fyidvlpgvxqcaxhmvdx1-gdm-47.0/share/gsettings-schemas/gdm-47.0/nvim/site/after
/nix/store/69vb12g2nz47j87zin6mjv2i6rkqvnh1-evolution-data-server-3.54.2/share/gsettings-schemas/evolution-data-server-3.54.2/nvim/site/after
/nix/store/w2v6kx9xq4ajlgbccgs2h7k5jv6hggn6-mutter-47.3/share/gsettings-schemas/mutter-47.3/nvim/site/after
/nix/store/i9z2s9039rsaq8rrk7z9m586a4h4jhwi-gnome-keyring-46.2/share/gsettings-schemas/gnome-keyring-46.2/nvim/site/after
/nix/store/dp2c6lh3mj8kx1l1520ackwjw8y9r400-gtk4-4.16.3/share/gsettings-schemas/gtk4-4.16.3/nvim/site/after
/nix/store/jmmq8mgh6y3milc6k3pvhyb7yw8sz89d-gsettings-desktop-schemas-47.1/share/gsettings-schemas/gsettings-desktop-schemas-47.1/nvim/site/after
/nix/store/clnhjv6bgx4794ckarqggwjfj9b71qkz-gnome-shell-47.2/share/nvim/site/after
/nix/store/xbmxsi30r2wb218cb4vk4mm09rim7ba2-shared-mime-info-2.4/share/nvim/site/after
/home/slava/.local/share/nvim/site/after
/nix/store/qvpmfwqfigj1y1jqpdz075ycxgqkhdw5-gnome-settings-daemon-47.2/etc/xdg/nvim/after
/run/current-system/sw/etc/xdg/nvim/after
/nix/var/nix/profiles/default/etc/xdg/nvim/after
/etc/profiles/per-user/slava/etc/xdg/nvim/after
/home/slava/.local/state/nix/profile/etc/xdg/nvim/after
/nix/profile/etc/xdg/nvim/after
/home/slava/.nix-profile/etc/xdg/nvim/after
/etc/xdg/nvim/after
/home/slava/.config/nvim/after

So, let's fix it by removing all the noise. Keep only neovim files and plugins

    # Let it work as if `./nvim/` would be at `~/.config/nvim/`.
    # Let it work as if `./nvim/` would be at `~/.config/nvim/`.
    initLua = ""
      + /* lua */ ''
        -- Cleanup rtp and packpath. Remove everything except for
        -- 1. `neovim-unwrapped` - files shipped with neovim
        -- 2. `vim-pack-dir` - plugins prepared by a nix neovim wrapper
        function cleanupRuntime()
          local vimPackDir = 'vim[-]pack[-]dir'
          local neovimRuntime = 'neovim[-]unwrapped'

          local packpath = vim.opt.packpath:get()
          local rtp = vim.opt.rtp:get()

          vim.opt.packpath = {}
          vim.opt.rtp = {}

          for _, v in pairs(packpath) do
            if string.match(v, vimPackDir) or string.match(v, neovimRuntime) then
              vim.opt.packpath:append(v)
            end
          end

          for _, v in pairs(rtp) do
            if string.match(v, vimPackDir) or string.match(v, neovimRuntime) then
              vim.opt.rtp:append(v)
            end
          end
        end
        cleanupRuntime()
      ''
      + (
        let config = if configMutable
                     then configPath
                     else configStored;
        in /* lua */ '';
        function appendConfig()
          vim.opt.rtp:prepend("${config}")
          vim.opt.rtp:append("${config}/after")
        end
        appendConfig()
        dofile("${config}/init.lua")
      '');

clean runtime:

packpath:
{ "/nix/store/l2bx2if0r7qlw289mhn1g8xsfjairm7k-vim-pack-dir",
"/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/share/nvim/runtime",
"/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/lib/nvim" }
rtp:
{ "/nix/store/1zypbm5r06xfldjz4sn1qvxzq14dmfap-neovim-config",
"/nix/store/l2bx2if0r7qlw289mhn1g8xsfjairm7k-vim-pack-dir",
"/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/share/nvim/runtime",
"/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/share/nvim/runtime/pack/dist/opt/cfilter",
"/nix/store/n73p6hpp8kwacj11nigvi3jn4fml6qcc-neovim-unwrapped-0.10.2/lib/nvim",
"/nix/store/1zypbm5r06xfldjz4sn1qvxzq14dmfap-neovim-config/after" }

Here I also changed the way how the config derivation is built and loaded , but that`s another story.

@mrcjkb , how do you find it?

[mrcjkb]

Hey 👋

thanks for sharing! 🙏

This looks like a neat trick. I won't add it to this template though, because it could have subtle unwanted side-effects
and I personally haven't had any slowness issues due to the packpath/runtimepath created by the nixpkgs wrapper util.

With the purity mindset it feels like a bug

I don't agree that it's a bug. That level of "purity" just isn't one of the goals of this template.