Nomarchy/modules/home/stylix.nix

# Stylix — themes the long tail of applications (GTK, Qt, cursors,
# fonts) from the same theme-state.json that drives the live engine.
#
# Division of labour: the hot-reload trio (Hyprland, Waybar, Ghostty)
# is owned by the Nomarchy engine and updates instantly; everything
# Stylix touches updates on the next home-manager switch. That is why
# autoEnable is off and the trio's Stylix targets stay disabled.
#
# Note: the stylix home module itself is imported by homeModules.nomarchy
# in flake.nix (it needs the stylix flake input).
{ config, lib, pkgs, ... }:

let
  cfg = config.nomarchy;
  t = cfg.theme;
  c = t.colors;
  hex = lib.removePrefix "#";

  # Map the Nomarchy palette onto base16 roles.
  base16 = {
    base00 = hex c.base;     # default background
    base01 = hex c.mantle;   # darker background (status bars)
    base02 = hex c.surface;  # selection background
    base03 = hex c.muted;    # comments
    base04 = hex c.subtext;  # dark foreground
    base05 = hex c.text;     # default foreground
    base06 = hex c.text;     # light foreground
    base07 = hex c.text;     # lightest foreground
    base08 = hex c.bad;      # red
    base09 = hex c.warn;     # orange
    base0A = hex c.warn;     # yellow
    base0B = hex c.good;     # green
    base0C = hex (builtins.elemAt t.ansi 6); # cyan
    base0D = hex c.accent;   # blue
    base0E = hex c.accentAlt;# magenta
    base0F = hex c.bad;      # brown/deprecated
  };

  # Submenu disclosure arrows: GTK/Adwaita expect pan-end-symbolic,
  # but Papirus doesn't ship it. Instead of complex CSS overrides and
  # bundled SVGs, we map the GTK CSS to use go-next-symbolic which
  # DOES exist in Papirus.
in
{
  config = lib.mkIf cfg.stylix.enable {
    stylix = {
      enable = true;
      autoEnable = false; # explicit targets only — the engine owns the rest
      polarity = if t.mode == "light" then "light" else "dark";
      base16Scheme = base16;

      targets = {
        gtk = {
          enable = true;
          # nm-applet / classic GTK menus: Stylix base16 selection can
          # collapse into surface/muted on dark themes (Boreal: selected
          # row and submenu arrows were effectively invisible). High-
          # contrast selected rows + explicit arrow colour. Appended to
          # Stylix's generated gtk.css (not gtk.gtk3.extraCss — that is a
          # no-op under Stylix).
          extraCss = ''
            menu menuitem, .menu menuitem, .context-menu menuitem {
              color: #${base16.base05};
            }
            menu menuitem:hover, menu menuitem:selected,
            .menu menuitem:hover, .menu menuitem:selected,
            .context-menu menuitem:hover, .context-menu menuitem:selected,
            menubar > menuitem:hover {
              background-color: #${base16.base0D};
              color: #${base16.base00};
            }
            menu menuitem:disabled, .menu menuitem:disabled {
              color: #${base16.base03};
            }
            /* Submenu disclosure arrows: map missing pan-end-symbolic to existing go-next-symbolic. */
            menu menuitem arrow:dir(ltr), .menu menuitem arrow:dir(ltr), .context-menu menuitem arrow:dir(ltr) {
              -gtk-icon-source: -gtk-icontheme("go-next-symbolic");
            }
            menu menuitem arrow:dir(rtl), .menu menuitem arrow:dir(rtl), .context-menu menuitem arrow:dir(rtl) {
              -gtk-icon-source: -gtk-icontheme("go-previous-symbolic");
            }
            check, radio {
              min-width: 14px;
              min-height: 14px;
              color: inherit;
            }
            /* GTK4 / popover menus (some portals). */
            popover.menu contents modelbutton {
              color: #${base16.base05};
            }
            popover.menu contents modelbutton:hover,
            popover.menu contents modelbutton:selected {
              background-color: #${base16.base0D};
              color: #${base16.base00};
            }
          '';
        };
        qt.enable = true;
        # No-op unless programs.zathura is on (viewers.nix enables it).
        zathura.enable = true;
      };

      cursor = {
        name = lib.mkDefault "Bibata-Modern-Classic";
        package = lib.mkDefault pkgs.bibata-cursors;
        size = lib.mkDefault 24;
      };

      # GTK/file-manager/rofi icon theme, resolved from the JSON in
      # theme.nix (per-theme `icons`, else Papirus-Dark/Light by mode).
      # Stylix sets gtk.iconTheme from this; both dark/light point at the
      # already-mode-resolved name. The package is papirus by default and
      # only unions in another pack when a theme's `icons` names one
      # (theme.nix — opt-in, no default closure bloat).
      icons = {
        enable = true;
        package = lib.mkDefault t.iconThemePackage;
        dark = t.iconTheme;
        light = t.iconTheme;
      };

      fonts = {
        monospace = {
          name = t.fonts.mono;
          package = lib.mkDefault pkgs.nerd-fonts.jetbrains-mono;
        };
        sansSerif = {
          name = t.fonts.ui;
          package = lib.mkDefault pkgs.inter;
        };
        serif = {
          name = t.fonts.ui;
          package = lib.mkDefault pkgs.inter;
        };
        emoji = {
          name = "Noto Color Emoji";
          package = lib.mkDefault pkgs.noto-fonts-color-emoji;
        };
        sizes.terminal = t.fonts.size;
      };
    };

    # GTK4/libadwaita and Qt6 apps decide dark vs light from the XDG
    # portal's color-scheme (org.freedesktop.appearance), which
    # xdg-desktop-portal-gtk sources from this gsettings key. Stylix sets
    # the GTK theme and `polarity` but not this, so a light theme still
    # rendered libadwaita/Qt apps dark (and vice-versa). Drive it from the
    # palette mode. (programs.dconf.enable is already on system-side.)
    dconf.settings."org/gnome/desktop/interface".color-scheme =
      if t.mode == "light" then "prefer-light" else "prefer-dark";
  };
}