Extract theme information out of vim

pkgs/vim/default.nix

@@ -1,4 +1,6 @@
 { pkgs
+, extraPlugins ? []
+, extraOptions ? ""
 , ...
 }:
 
@@ -53,7 +55,6 @@ let
     vimrcConfig.packages.myVimPackage = with pkgs.vimPlugins; with plugins; {
       # loaded on launch
       start = [
-        Solarized
         calendar-vim
         dhall-vim
         fzf-vim
@@ -77,7 +78,7 @@ let
         vim-timedot
         vimtex
         vimwiki
-      ];
+      ] // extraPlugins;
       # manually loadable by calling `:packadd $plugin-name`
       opt = [
       ];
@@ -110,19 +111,14 @@ let
       syntax enable
       if has('gui_running')
           " When gui is running, it pretty much sets its own colors
-          set background=dark
           set guifont=Victor\ Mono\ 14
           set notitle
           set guioptions=a
       else
           " If we're in a terminal, then we stay default, terminal will choose
           " which colors it likes.
-          set background=dark
       endif
 
-      let g:solarized_termcolors=16
-      let g:airline_solarized_bg='dark'
-      colorscheme solarized
 
       " Set line numbering
       set number