Restore bat color-setting

home/fish.nix

@@ -204,7 +204,7 @@
       # Other
       ".." = "cd ..";
       ":q" = "exit";
-      cat = "${bat}/bin/bat --style=plain";
+      cat = "${bat}/bin/bat --style=plain --paging=never";
       du = "${du-dust}/bin/dust";
       g = "${gitAndTools.git}/bin/git";
       ls = "${exa}/bin/exa";

home/programs.nix

@@ -17,9 +17,27 @@ in
       enable = true;
       config = {
         style = "auto";
-        theme = "base16-256";
       };
     };
+    # See `./shells.nix` for more on how this is used.
+    fish = {
+      functions = {
+        set-bat-colors = {
+          body = ''
+            if test "$term_background" = light
+              set -xg BAT_THEME "Monokai Extended Light"
+            else
+              set -xg BAT_THEME "TwoDark"
+            end
+          '';
+          onVariable = "term_background";
+        };
+      };
+      interactiveShellInit = ''
+        # Set `bat` colors based on value of `$term_backdround` when shell starts up.
+        set-bat-colors
+      '';
+    };
     # Direnv, load and unload environment variables depending on the current directory.
     # https://direnv.net
     # https://rycee.gitlab.io/home-manager/options.html#opt-programs.direnv.enable