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My NixOS systems configurations.
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default.nix (427B)

      1 { config, lib, ... }:
      2 let
      3   inherit (lib) mkIf mkOption mkOverride types;
      4   cfg = config.modules.editors;
      5 in
      6 {
      7   imports = [ ./vim.nix ./emacs.nix ];
      8   options.modules.editors = {
      9     default = mkOption {
     10       description = "default editor";
     11       type = types.str;
     12       default = "vim";
     13     };
     14   };
     15   config = mkIf (cfg.default != null) {
     16     environment.variables = {
     17       EDITOR = mkOverride 0 cfg.default;
     18     };
     19   };
     20 }