Major config overhaul: use custom modules, setup for multi-host config, and less boilerplate

modules/user/editor/default.nix

@@ -0,0 +1,30 @@
+{ config, lib, pkgs, ... }:
+
+let
+  editor = config.userSettings.editor;
+  term = config.userSettings.terminal;
+in {
+  options = {
+    userSettings.editor = lib.mkOption {
+      default = "emacs";
+      description = "Default editor";
+      type = lib.types.enum [ "emacs" ];
+      # TODO add more editors
+      #type = lib.types.enum [ "emacs" "vim" "nvim" "neovide" "nano" "micro" "vscodium" "kate" "pulsar" ];
+    };
+    userSettings.spawnEditor = lib.mkOption {
+      default = "";
+      description = "Command to spawn editor";
+    };
+  };
+
+  config = {
+    userSettings.emacs.enable = lib.mkIf (config.userSettings.editor == "emacs") true;
+    userSettings.spawnEditor = lib.mkMerge [
+      (lib.mkIf (editor == "emacs") "emacsclient -c -a 'emacs'")
+      (lib.mkIf (editor == "neovide") "neovide -- --listen /tmp/nvimsocket")
+      (lib.mkIf (builtins.elem editor [ "vim" "nvim" "nano" "micro" ]) ("exec " + term + " -e " + editor))
+      (lib.mkIf (!(builtins.elem editor [ "emacs" "vim" "nvim" "neovide" "nano" "micro"])) editor)
+    ];
+  };
+}