fix environment variables

modules/base/fish.nix

@@ -2,18 +2,38 @@
   # https://nixos.wiki/wiki/Fish
   # https://nixos.wiki/wiki/Command_Shell
 
+  programs.fish = {
+    enable = true;
+    interactiveShellInit = ''
+      # fzf: use ctrl+f to list files and ctrl+g to show the git log
+      fzf_configure_bindings --directory=\cf --git_log=\cg
+    '';
+  };
+
+  # Installing a fish plugin automatically enables it
   environment.systemPackages = with pkgs; [
     fishPlugins.colored-man-pages
     fishPlugins.fzf-fish
     fishPlugins.pure
   ];
 
-  programs.fish = {
-    enable = true;
-    interactiveShellInit = ''
-      fzf_configure_bindings --directory=\cf --git_log=\cg
-    '';
-  };
+  # Set fish as the default shell system-wide
   users.defaultUserShell = pkgs.fish;
+
+  # Add fish to the list of permissible login shells for user accounts
   environment.shells = with pkgs; [ fish ];
+
+  # Enabling fish in both NixOS and home manager is required to pick
+  # up completions and environment variables set by NixOS nixpkgs _and_
+  # home manager modules at the same time.
+  # As a test, the environment variables from
+  # $ nix repl
+  # > :lf .
+  # > :p nixosConfigurations.omega.config.home-manager.users.caspervk.home.sessionVariables
+  # > :p nixosConfigurations.omega.config.home-manager.users.caspervk.home.sessionVariablesExtra
+  # should be available in the desktop environment's shell.
+  # See https://nix-community.github.io/home-manager/index.html#_why_are_the_session_variables_not_set.
+  home-manager.users.caspervk = {
+    programs.fish.enable = true;
+  };
 }

modules/base/vim/default.nix

@@ -32,6 +32,4 @@
       extraLuaConfig = builtins.readFile ./config.lua;
     };
   };
-
-  environment.variables.EDITOR = "vim";
 }