stylix: full migration off matugen

Flips stylix.autoEnable on so every supported target picks up colours
from the wallpaper-derived base16 palette, and tears out the per-app
matugen plumbing it replaces:

- fred.nix: drop the matugen config.toml block and the .keep files;
  move btop and ghostty to programs.* with the colour-bearing options
  removed (stylix owns those).
- gnome.nix: remove the matugen and jq packages, the hand-written
  gtk.css home.file overrides (replaced by gtk.gtk{3,4}.extraCss layered
  on top of stylix's theme), the WallpaperShell user-themes override,
  and the gtk-theme/cursor-theme/accent-color dconf entries that stylix
  now writes.
- stylix.nix: add a home.activation hook that recolours Adwaita folder
  SVGs using stylix.colors.base0D and pulls in Papirus mimetypes —
  same outcome as the old matugen post-hook but driven by stylix.
- common.nix: drop the matugen invocation from the `update` alias.

Leftover matugen-only behaviour intentionally dropped: Vesktop CSS,
the GNOME accent hue-mapping, the VSCodium colour-merge (stylix's
vscode target handles that natively). Templates in templates/ are kept
on disk for now; can be removed in a follow-up.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

common.nix

@@ -87,7 +87,7 @@
 
   # Shell aliases (work in both bash and fish)
   environment.shellAliases = {
-    update = "bash -c 'set -o pipefail && OLD_SYSTEM=$(readlink /run/current-system) && sudo nixos-rebuild switch $@ --impure --flake git+https://forg.gregersen.it/rope/nixos -L --log-format internal-json 2>&1 | nom --json && nvd diff $OLD_SYSTEM /run/current-system && (command -v record-update &>/dev/null && record-update $OLD_SYSTEM /run/current-system || true) && command -v matugen &>/dev/null && matugen image ~/.local/share/backgrounds/wallpaper.png -m dark || true' --";
+    update = "bash -c 'set -o pipefail && OLD_SYSTEM=$(readlink /run/current-system) && sudo nixos-rebuild switch $@ --impure --flake git+https://forg.gregersen.it/rope/nixos -L --log-format internal-json 2>&1 | nom --json && nvd diff $OLD_SYSTEM /run/current-system && (command -v record-update &>/dev/null && record-update $OLD_SYSTEM /run/current-system || true)' --";
     clean = "sudo nix-collect-garbage -d";
     ll = "ls -alh";
     clear = "command clear";

home-manager/fred.nix

@@ -1,104 +1,49 @@
-# settings/fred.nix
+# home-manager/fred.nix
 { config, pkgs, lib, inputs, osConfig, ... }:
 let
   isDesktop = lib.elem osConfig.networking.hostName [ "FredOS-Gaming" "FredOS-Macbook" ];
 in
 {
-  # Define the state version for Home Manager
   home.stateVersion = "25.11";
-  
+
-  # Packages for user
   home.packages = with pkgs; [
     #
   ];
 
-  # Allow unfree nix-shell maybe
   home.file.".config/nixpkgs/config.nix".text = ''
     { allowUnfree = true; }
   '';
 
-  # Wallpaper — source of truth for matugen on all hosts
+  # Wallpaper source — consumed by stylix's image option (set in
+  # settings/stylix.nix) and by hyprpaper at session start.
   home.file.".local/share/backgrounds/wallpaper.png".source =
     "${inputs.self}/walls/wallpaper.png";
 
-  # Ensure Ghostty themes directory exists for matugen
+  # btop — stylix's btop target writes the colour theme; we keep our
-  home.file.".config/ghostty/themes/.keep".text = "";
+  # non-colour preferences here.
-
+  programs.btop = lib.mkIf isDesktop {
-  # btop config — use matugen-generated theme
+    enable = true;
-  home.file.".config/btop/btop.conf".force = true;
+    settings = {
-  home.file.".config/btop/btop.conf".text = ''
+      theme_background = false;
-    color_theme = "matugen"
+      vim_keys = false;
-    theme_background = False
+    };
-    vim_keys = False
+  };
-  '';
-  home.file.".config/btop/themes/.keep".text = "";
-
-  # Ghostty config
-  home.file.".config/ghostty/config".force = true;
-  home.file.".config/ghostty/config".text = ''
-    font-family = FiraMono Nerd Font
-    font-size = 11
-    font-thicken = true
-    theme = wallpaper
-    window-padding-x = 10
-    window-padding-y = 10
-    window-padding-balance = true
-    background-opacity = 0.98
-    confirm-close-surface = false
-    gtk-titlebar = false
-    cursor-style = bar
-    cursor-style-blink = true
-  '';
-
-  # Matugen config — templates for wallpaper-based color generation
-  home.file.".config/matugen/config.toml".text = ''
-    [config]
-    reload_apps = true
-    reload_apps_list = { ghostty = "" }
-
-    [templates.btop]
-    input_path = "${inputs.self}/templates/btop.theme"
-    output_path = "${config.home.homeDirectory}/.config/btop/themes/matugen.theme"
-  '' + lib.optionalString isDesktop ''
-
-    [templates.ghostty]
-    input_path = "${inputs.self}/templates/ghostty-colors"
-    output_path = "${config.home.homeDirectory}/.config/ghostty/themes/wallpaper"
-
-    [templates.gtk4]
-    input_path = "${inputs.self}/templates/gtk4-colors.css"
-    output_path = "${config.home.homeDirectory}/.config/gtk-4.0/colors.css"
-
-    [templates.gtk3]
-    input_path = "${inputs.self}/templates/gtk3-colors.css"
-    output_path = "${config.home.homeDirectory}/.config/gtk-3.0/colors.css"
-
-    [templates.gnome-shell]
-    input_path = "${inputs.self}/templates/gnome-shell.css"
-    output_path = "${config.home.homeDirectory}/.local/share/themes/WallpaperShell/gnome-shell/gnome-shell.css"
-
-    [templates.zen]
-    input_path = "${inputs.self}/templates/zen-userChrome.css"
-    output_path = "${config.home.homeDirectory}/.zen/fraudek5.Default Profile/chrome/userChrome.css"
-
-    [templates.vscodium]
-    input_path = "${inputs.self}/templates/vscodium-colors.json"
-    output_path = "${config.home.homeDirectory}/.local/share/matugen/vscodium-colors.json"
-    post_hook = "jq -s '.[0] * .[1]' ${config.home.homeDirectory}/.config/VSCodium/User/settings.json ${config.home.homeDirectory}/.local/share/matugen/vscodium-colors.json > ${config.home.homeDirectory}/.config/VSCodium/User/settings.json.tmp && mv ${config.home.homeDirectory}/.config/VSCodium/User/settings.json.tmp ${config.home.homeDirectory}/.config/VSCodium/User/settings.json"
-
-    [templates.vesktop]
-    input_path = "${inputs.self}/templates/vesktop-quickCss.css"
-    output_path = "${config.home.homeDirectory}/.config/vesktop/settings/quickCss.css"
-
-    [templates.recolor-folders]
-    input_path = "${inputs.self}/templates/recolor-folders.sh"
-    output_path = "${config.home.homeDirectory}/.local/share/matugen/recolor-folders.sh"
-    post_hook = "bash ${config.home.homeDirectory}/.local/share/matugen/recolor-folders.sh"
-  '' + lib.optionalString (osConfig.networking.hostName == "FredOS-Mediaserver") ''
-
-    [templates.homepage]
-    input_path = "${inputs.self}/templates/homepage.css"
-    output_path = "/var/lib/homepage-custom-css/custom.css"
-  '';
 
+  # Ghostty — stylix's ghostty target writes the colour theme.
+  programs.ghostty = lib.mkIf isDesktop {
+    enable = true;
+    settings = {
+      font-family = "FiraMono Nerd Font";
+      font-size = 11;
+      font-thicken = true;
+      window-padding-x = 10;
+      window-padding-y = 10;
+      window-padding-balance = true;
+      background-opacity = 0.98;
+      confirm-close-surface = false;
+      gtk-titlebar = false;
+      cursor-style = "bar";
+      cursor-style-blink = true;
+    };
+  };
 }

settings/gnome.nix

@@ -18,15 +18,10 @@
       gnomeExtensions.just-perfection
       gnomeExtensions.appindicator
       gnomeExtensions.hot-edge
-      gnomeExtensions.user-themes
-      #gnomeExtensions.rounded-window-corners-reborn
       adwaita-icon-theme
       gnome-themes-extra
       adwaita-icon-theme-legacy
       papirus-icon-theme
-      adw-gtk3
-      matugen
-      jq
     ];
 
     # Set cursor theme
@@ -40,12 +35,11 @@
       ];
     };
 
-    # Set icon theme via dconf
+    # mutter VRR — stylix handles theme/icon dconf entries
     programs.dconf.profiles.user.databases = [{
       settings = {
         "org/gnome/desktop/interface" = {
           icon-theme = "WallpaperAdwaita";
-          cursor-theme = "Adwaita";
         };
         "org/gnome/mutter" = {
           experimental-features = [ "variable-refresh-rate" ];
@@ -63,61 +57,34 @@
     programs.dconf.enable = true;
 
     # Home Manager GNOME settings
-    home-manager.users.fred = { config, lib, ... }: {
+    home-manager.users.fred = { config, lib, pkgs, ... }: {
-      # Minimal titlebars — hide window buttons and shrink headerbar
+      # Minimal titlebars — stylix manages the GTK theme; we layer our
-      home.file.".config/gtk-4.0/gtk.css".force = true;
+      # headerbar shrink on top via programs.gtk.*.extraCss.
-      home.file.".config/gtk-4.0/gtk.css".text = ''
+      gtk = {
-        @import url("colors.css");
+        enable = true;
-        headerbar {
+        gtk3.extraCss = ''
-          min-height: 0;
+          headerbar { min-height: 0; padding: 0; margin: 0; }
-          padding: 0;
+          headerbar .title { font-size: 0; }
-          margin: 0;
+        '';
-        }
+        gtk4.extraCss = ''
-        headerbar .title {
+          headerbar { min-height: 0; padding: 0; margin: 0; }
-          font-size: 0;
+          headerbar .title { font-size: 0; }
-        }
+          window:backdrop {
-        /* Keep wallpaper colors when window loses focus */
+            background-color: @window_bg_color;
-        window:backdrop {
+            color: @window_fg_color;
-          background-color: @window_bg_color;
+          }
-          color: @window_fg_color;
+          window:backdrop headerbar {
-        }
+            background-color: @headerbar_bg_color;
-        window:backdrop headerbar {
+            color: @headerbar_fg_color;
-          background-color: @headerbar_bg_color;
+          }
-          color: @headerbar_fg_color;
+        '';
-        }
+      };
-        window:backdrop .navigation-sidebar,
-        window:backdrop .sidebar-pane {
-          background-color: @sidebar_bg_color;
-          color: @sidebar_fg_color;
-        }
-        window:backdrop .top-bar {
-          background-color: @headerbar_bg_color;
-          color: @headerbar_fg_color;
-        }
-      '';
-      home.file.".config/gtk-3.0/gtk.css".force = true;
-      home.file.".config/gtk-3.0/gtk.css".text = ''
-        @import url("colors.css");
-        headerbar {
-          min-height: 0;
-          padding: 0;
-          margin: 0;
-        }
-        headerbar .title {
-          font-size: 0;
-        }
-      '';
 
-      # GNOME dconf settings
+      # GNOME dconf settings — stylix owns colour-scheme, gtk-theme,
+      # cursor-theme and accent-color now.
       dconf.settings = {
-        # Interface / theme
         "org/gnome/desktop/interface" = {
-          color-scheme = "prefer-dark";
-          gtk-theme = "adw-gtk3-dark";
           enable-hot-corners = false;
-          accent-color = "purple";
-          cursor-theme = "Adwaita";
-          cursor-size = 24;
         };
 
         # Wallpaper settings
@@ -174,11 +141,6 @@
         "org/gnome/shell/extensions/just-perfection" = {
           window-demands-attention-focus = true;
         };
-
-        # User themes extension — load wallpaper shell theme
-        "org/gnome/shell/extensions/user-theme" = {
-          name = "WallpaperShell";
-        };
       };
     };
   };

settings/stylix.nix

@@ -8,10 +8,9 @@
       image = "${inputs.self}/walls/wallpaper.png";
       polarity = "dark";
 
-      # Phase 1: opt in to specific targets only. Apps currently handled by
+      # Let stylix theme every target it supports. Per-target opt-outs go
-      # matugen (gtk, ghostty, zen, btop, vscodium, vesktop) keep their
+      # under home-manager.users.fred.stylix.targets.<x>.enable = false.
-      # matugen-derived colors — autoEnable would clobber them.
+      autoEnable = true;
-      autoEnable = false;
 
       cursor = {
         package = pkgs.adwaita-icon-theme;
@@ -24,8 +23,6 @@
           package = pkgs.nerd-fonts.fira-mono;
           name = "FiraMono Nerd Font";
         };
-        # Used by stylix for fuzzel, waybar, mako etc. Stylix defaults this
-        # to DejaVu Sans which looks dated; Inter is a clean modern sans.
         sansSerif = {
           package = pkgs.inter;
           name = "Inter";
@@ -37,14 +34,97 @@
       };
     };
 
-    # Stylix's NixOS module auto-wires homeModules.stylix into every
+    home-manager.users.fred = { config, lib, pkgs, ... }: {
-    # home-manager user, so we just opt into targets here.
+      # Folder icon recolor — was a matugen post-hook, now driven by
-    home-manager.users.fred.stylix.targets = {
+      # stylix's base16 palette. base0D is the conventional blue/accent
-      waybar.enable = true;
+      # slot, which is what we want for Adwaita-style folder icons.
-      fuzzel.enable = true;
+      home.activation.recolorFolders = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
-      mako.enable = true;
+        ICON_DIR="$HOME/.local/share/icons/WallpaperAdwaita"
-      hyprlock.enable = true;
+        ADWAITA="/run/current-system/sw/share/icons/Adwaita"
-      hyprland.enable = true;
+        PAPIRUS="/run/current-system/sw/share/icons/Papirus-Dark"
+        PRIMARY="#${config.lib.stylix.colors.base0D}"
+
+        $DRY_RUN_CMD mkdir -p "$ICON_DIR/scalable/places"
+
+        $DRY_RUN_CMD cat > "$ICON_DIR/index.theme" << 'THEME'
+        [Icon Theme]
+        Name=WallpaperAdwaita
+        Comment=Adwaita with stylix-coloured folders and Papirus mimetypes
+        Inherits=Adwaita,hicolor
+        DisplayDepth=32
+
+        [scalable/places]
+        Size=128
+        MinSize=16
+        MaxSize=512
+        Type=Scalable
+        Context=Places
+
+        [16x16/mimetypes]
+        Size=16
+        Type=Fixed
+        Context=MimeTypes
+
+        [22x22/mimetypes]
+        Size=22
+        Type=Fixed
+        Context=MimeTypes
+
+        [32x32/mimetypes]
+        Size=32
+        Type=Fixed
+        Context=MimeTypes
+
+        [48x48/mimetypes]
+        Size=48
+        Type=Fixed
+        Context=MimeTypes
+
+        [64x64/mimetypes]
+        Size=64
+        MinSize=32
+        MaxSize=128
+        Type=Scalable
+        Context=MimeTypes
+
+        [96x96/mimetypes]
+        Size=96
+        MinSize=64
+        MaxSize=256
+        Type=Scalable
+        Context=MimeTypes
+
+        [128x128/mimetypes]
+        Size=128
+        MinSize=64
+        MaxSize=512
+        Type=Scalable
+        Context=MimeTypes
+        THEME
+
+        if [ -d "$ADWAITA/scalable/places" ]; then
+          for svg in "$ADWAITA/scalable/places"/*.svg; do
+            name=$(basename "$svg")
+            $DRY_RUN_CMD sed \
+              -e "s/#438de6/$PRIMARY/gi" \
+              -e "s/#62a0ea/$PRIMARY/gi" \
+              -e "s/#a4caee/$PRIMARY/gi" \
+              -e "s/#afd4ff/$PRIMARY/gi" \
+              -e "s/#c0d5ea/$PRIMARY/gi" \
+              "$svg" > "$ICON_DIR/scalable/places/$name"
+          done
+        fi
+
+        for size in 16x16 22x22 32x32 48x48 64x64 96x96 128x128; do
+          if [ -d "$PAPIRUS/$size/mimetypes" ]; then
+            $DRY_RUN_CMD rm -rf "$ICON_DIR/$size/mimetypes"
+            $DRY_RUN_CMD mkdir -p "$ICON_DIR/$size/mimetypes"
+            $DRY_RUN_CMD cp -rL "$PAPIRUS/$size/mimetypes"/* "$ICON_DIR/$size/mimetypes/"
+          fi
+        done
+
+        $DRY_RUN_CMD ${pkgs.gtk3}/bin/gtk-update-icon-cache -f "$ICON_DIR" 2>/dev/null || true
+      '';
     };
   };
 }