From 648c150f6e4e89c9c04158795da1ab13370d7f73 Mon Sep 17 00:00:00 2001
From: Craig Jennings <c@cjennings.net>
Date: Mon, 6 Jul 2026 08:43:03 -0500
Subject: feat(readers): default EPUB and PDF to a dark/sepia/light reading
 cycle

nov-mode's reading cycle opened on sepia and ran sepia, dark, light. I reordered it to dark, sepia, light and made a fresh EPUB open dark.

pdf-view only had a binary midnight toggle. I added a matching palette layer: a fresh PDF opens dark, and c cycles dark, sepia, light, none (C selects by name, M also cycles). Each palette is a foreground/background pair fed to pdf-view-midnight-minor-mode, so sepia and light are that same duotone with warmer and lighter colors. The pdf colors mirror the nov palettes so EPUBs and PDFs read alike.

Pure name-to-colors and cycle logic are unit-tested. The live render needs a manual check.
---
 tests/test-nov-reading--config-defaults.el | 38 ++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 tests/test-nov-reading--config-defaults.el

(limited to 'tests/test-nov-reading--config-defaults.el')

diff --git a/tests/test-nov-reading--config-defaults.el b/tests/test-nov-reading--config-defaults.el
new file mode 100644
index 00000000..5e454ce1
--- /dev/null
+++ b/tests/test-nov-reading--config-defaults.el
@@ -0,0 +1,38 @@
+;;; test-nov-reading--config-defaults.el --- nov reading default/order tests -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Asserts the shipped reading-view defaults: a fresh EPUB opens dark, and the
+;; `c' cycle runs dark -> sepia -> light -> none -> back.  The pure-logic file
+;; test-nov-reading--palette.el covers the cycle mechanics on fixtures; this file
+;; pins the real `cj/nov-reading-palettes' / `cj/nov-reading-default-palette'
+;; values so a reorder can't silently drift the default or the cycle order.
+
+;;; Code:
+
+(require 'ert)
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'nov-reading)
+
+(declare-function cj/nov--next-reading-palette "nov-reading" (current names))
+(defvar cj/nov-reading-palettes)
+(defvar cj/nov-reading-default-palette)
+
+(ert-deftest test-nov-reading-config-default-is-dark ()
+  "Normal: a fresh nov buffer opens on the dark palette."
+  (should (equal cj/nov-reading-default-palette "dark")))
+
+(ert-deftest test-nov-reading-config-order-is-dark-sepia-light ()
+  "Normal: the shipped palette order is dark, then sepia, then light."
+  (should (equal (mapcar #'car cj/nov-reading-palettes)
+                 '("dark" "sepia" "light"))))
+
+(ert-deftest test-nov-reading-config-cycle-from-default ()
+  "Normal: cycling from the default advances dark -> sepia -> light -> none -> dark."
+  (let ((names (mapcar #'car cj/nov-reading-palettes)))
+    (should (equal (cj/nov--next-reading-palette "dark" names) "sepia"))
+    (should (equal (cj/nov--next-reading-palette "sepia" names) "light"))
+    (should-not (cj/nov--next-reading-palette "light" names))
+    (should (equal (cj/nov--next-reading-palette nil names) "dark"))))
+
+(provide 'test-nov-reading--config-defaults)
+;;; test-nov-reading--config-defaults.el ends here
-- 
cgit v1.2.3