Emacs: use stylix to customise base16-theme package

Add my custom modifications from README.el to extraConfig.el

system/home/emacs/default.nix

@@ -5,7 +5,6 @@
     ../shell/git.nix
     ../gpg/default.nix
   ];
-  stylix.targets.emacs.enable = false;
   services.emacs = {
     enable = true;
     package = config.programs.emacs.finalPackage;
@@ -21,47 +20,12 @@
       withImageMagick = true;
       withPgtk = true;
     };
-    extraConfig =
+    extraConfig = builtins.readFile ./extraConfig.el;
-      let
-        fixed-font-family = "${config.stylix.fonts.monospace.name}";
-        variable-font-family = "${config.stylix.fonts.sansSerif.name}";
-        font-height = builtins.toString (
-          builtins.floor (builtins.mul config.stylix.fonts.sizes.applications 10)
-        );
-        custom-theme-name = "nix";
-        custom-theme = pkgs.writeTextFile {
-          name = "custom-emacs-theme";
-          destination = "/${custom-theme-name}-theme.el";
-          text = ''
-            (deftheme ${custom-theme-name}
-              "Use Nix customised fonts for main faces")
-
-            (custom-theme-set-variables
-              '${custom-theme-name}
-              '(menu-bar-mode nil))
-
-            (custom-theme-set-faces
-             '${custom-theme-name}
-             '(default ((t (:family "${fixed-font-family}" :height ${font-height}))))
-             '(fixed-pitch ((t (:family "${fixed-font-family}"))))
-             '(fixed-pitch-serif ((t (:family "${fixed-font-family}"))))
-             '(variable-pitch ((t (:family "${variable-font-family}")))))
-
-            (provide-theme '${custom-theme-name})
-          '';
-        };
-        custom-theme-hash = builtins.hashFile "sha256" "${custom-theme}/${custom-theme-name}-theme.el";
-      in
-      ''
-        (add-to-list 'custom-theme-load-path "${custom-theme}")
-        (add-to-list 'custom-safe-themes "${custom-theme-hash}")
-        (load-theme '${custom-theme-name})
-      '';
     extraPackages =
       epkgs: with epkgs; [
         treesit-grammars.with-all-grammars
-        mu4e
         emacsql-sqlite
+        mu4e
       ];
   };
   home.packages = with pkgs; [

system/home/emacs/extraConfig.el

@@ -0,0 +1,42 @@
+(defun my/configure-theme ()
+  "Load theme and configure some faces."
+  (interactive)
+
+  ;; Set some font-lock faces to be italic
+  (set-face-attribute 'font-lock-doc-face nil :slant 'italic)
+  (set-face-attribute 'font-lock-comment-face nil :slant 'italic)
+  (set-face-attribute 'font-lock-comment-delimiter-face nil :slant 'italic)
+
+  ;; Change outline headers to follow rainbow order
+  (require 'outline)
+  (when (boundp 'base16-stylix-theme-colors)
+    (dolist (pairing '((outline-1 . :base08)
+                       (outline-2 . :base09)
+                       (outline-3 . :base0A)
+                       (outline-4 . :base0B)
+                       (outline-5 . :base0C)
+                       (outline-6 . :base0D)
+                       (outline-7 . :base0E)
+                       (outline-8 . :base0F)))
+      (set-face-attribute (car pairing) nil
+                          :foreground
+                          (plist-get base16-stylix-theme-colors (cdr pairing))))
+
+    (require 'org-faces)
+    ;; Lighten `org-agenda-clocking' background to be more legible.
+    (set-face-attribute 'org-agenda-clocking nil :background
+                        (plist-get base16-stylix-theme-colors :base01))
+    ;; Set `org-hide' face to actually match background colour
+    (set-face-attribute 'org-hide nil :foreground
+                        (plist-get base16-stylix-theme-colors :base00))
+    (with-eval-after-load 'org-noter
+      (set-face-attribute 'org-noter-no-notes-exist-face nil :foreground
+                          (plist-get base16-stylix-theme-colors :base08))
+      (set-face-attribute 'org-noter-notes-exist-face nil :foreground
+                          (plist-get base16-stylix-theme-colors :base0B))))
+  )
+
+(with-eval-after-load 'base16-theme
+  (require 'server)
+  (add-hook 'after-init-hook (lambda () (my/configure-theme)))
+  (add-hook 'server-after-make-frame-hook (lambda () (my/configure-theme))))