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Record verified light-mode results for the theme hooks

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Tested with the system actually in light mode rather than inferred from dark:

- the status bar switches in the same second client-light-theme fires
- a fresh nvim reports background=light, so the OSC 11 round trip through tmux
  to ghostty works and restarting nvim is genuinely sufficient
- delta resolves syntax-theme = GitHub, its light default, against Monokai
  Extended on dark, so it does detect the terminal background

Both the nvim and delta checks needed a real tty to be meaningful. Run with
stdout on a pipe they each fall back to their dark default, which looks like a
correct answer while proving nothing.

Also documents why the first Light switch did not move the status bar: tmux
enables the terminal's theme-reporting mode when a client attaches, so the
client that predated these hooks was never asked to report changes. A detach and
reattach fixes it, and a fresh server never sees it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jonny Barnes 2026-08-09 12:53:03 +01:00
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@ -84,8 +84,19 @@ toggling Light/Dark by hand — nothing in the chain knows why it changed.
> [!NOTE]
> A running nvim will not follow a live change: the docs are explicit that the
> TUI sets `background` *on startup* if it can detect it. New instances are
> fine; existing ones need `:set background=light` or a restart. delta is
> per-invocation so should be fine, but that is untested here.
> fine — verified, a fresh nvim in light mode reports `background=light` — but
> existing ones need `:set background=light` or a restart.
Verified in light mode: the status bar switches in the same second the hook
fires, a fresh nvim detects `light`, and delta resolves its light default
(`syntax-theme = GitHub`, against `Monokai Extended` on dark).
> [!TIP]
> When adding these hooks to an *already running* tmux server, detach and
> reattach. tmux enables the terminal’s theme-reporting mode when a client
> attaches, so a client that predates the hooks never gets asked to report
> changes — `#{client_theme}` still reads correctly, because that is answered by
> a direct query, but no hook fires until the client reattaches.
> [!NOTE]
> This previously used [`dark-mode-notify`](https://github.com/bouk/dark-mode-notify)