# NexusOS desktop theme

XFCE/GTK desktop theme (distinct from the web UI in `interface/web/`).
Lime-green + purple, dark, with tightened menus.

## Layout

| Path | What |
|---|---|
| `NexusOS/` | GTK2/3 + xfwm4 theme. **GTK3 CSS in `NexusOS/gtk-3.0/` is hand-maintained** (no build step). |
| `NexusOS/gtk-3.0/colors.css` | All color tokens. Edit colors here, not in the widget files. |
| `NexusOS-icons/` | Icon theme (inherits `Papirus-Dark`). |
| `../../management/Mint-Y-Nexus/` | XFCE app-icon set. |
| `_palette.py` + `*-src/build.py` | Regenerate gtk2 / icons / xfwm4 — **NOT gtk-3.0**. |
| `install-theme.sh` | Idempotent restore of all the *wiring* (see below). |
| `gtk3-user-overrides.css` | Symlinked to `~/.config/gtk-3.0/gtk.css`. |

## How it's wired (the part backups miss)

The files above are just *source*. What makes the desktop use them lives
outside this folder and is recreated by `install-theme.sh`:

- Symlinks: `~/.themes/NexusOS`, `~/.icons/NexusOS`, `~/.icons/Mint-Y-Nexus`,
  `~/.config/gtk-3.0/gtk.css`.
- xfconf: `xsettings` (`/Net/ThemeName`, `/Net/IconThemeName`,
  `/Gtk/CursorThemeName`, `/Gtk/FontName`) and `xfwm4 /general/theme`.
- `~/.config/gtk-3.0/settings.ini` **and** `~/.config/gtk-4.0/settings.ini`.

Canonical values: theme `NexusOS`, icons `NexusOS`, cursor `DMZ-White`,
font `Ubuntu 10`. Keep these in sync with `NexusOS/index.theme` and
`install-theme.sh`.

## Apply / reload after editing

```bash
xfconf-query -c xsettings -p /Net/ThemeName -s Adwaita
xfconf-query -c xsettings -p /Net/ThemeName -s NexusOS
xfdesktop --reload & xfce4-panel -r
```

Some apps cache the theme at startup and need a full restart.

## Backup / restore

- `bin/backup.sh` (run at home): snapshots live wiring into
  `restore-snapshot/`, then lftp-mirrors the repo to the router.
- `bin/restore.sh` / `bin/restore-full.sh`: pull back, rebuild
  venv/frontend, then auto-run `install-theme.sh`.
- The repo is git-tracked; **`backup.sh` mirrors `.git` too**, so if a
  bulk `git add` is ever interrupted run `git gc --prune=now` before
  backing up (a killed `git add -A` once left 4 GB of loose objects).

## Gotchas (each cost real debugging time)

1. **Theme silently falls back to Adwaita** if `gtk-theme-name` in
   `settings.ini` and xfconf `xsettings/Net/ThemeName` disagree, or
   point at a non-existent theme. Edits then have zero visible effect.
2. **`settings.ini` is machine-generated** by xfsettingsd from
   `xsettings.xml` — don't symlink it into the repo. **GTK4 has its own
   `~/.config/gtk-4.0/settings.ini`** that xsettings does *not* override;
   it must be reconciled separately (easy to forget).
3. **`@border` == `@overlay_bg` (`#2e3236`)** in `colors.css`, so a
   separator drawn in `@border` on an overlay surface is invisible. Use
   `@border_strong` / `@menu_border`. Root collision is unfixed; patched
   per-spot.
4. **`gtk-menu-images`** toggles icons in classic GtkMenus only. It does
   **not** affect the Whisker menu (separate widget tree).
5. **Whisker menu**: the popup's identifier is set via
   `gtk_widget_set_name()`, so CSS must target **`#whiskermenu-window`
   (an #id), not `.whiskermenu-window` (a class)** — a class selector
   matches nothing. The base `window.background` rule also outranks a
   bare class; `#id` wins on both counts. Whisker version: 2.9.x.
   Its app/category lists are `treeview`/`iconview`; restart
   `xfce4-panel` to reload its CSS.
6. **Menu surfaces** use `@menu_bg` (`#2a1d33`) / `@menu_border`
   (`#4d3461`) — dark purple. Tooltips/menubars/cards stay on the gray
   surface palette deliberately.
7. **`.gitignore` does not support trailing/inline comments.** A
   `Dir/ # note` line matches nothing — comments must be on their own
   line. (This once let a `git add` start ingesting the 28 GB venv.)