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nov.el: Major mode for reading EPUBs in Emacs

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git clone https://depp.brause.cc/nov.el.git

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33931 nov.el

README.md

About

nov.el provides a major mode for reading EPUB documents.

Features:

Screenshot

Installation

Set up the MELPA or MELPA Stable repository if you haven't already and install with M-x package-install RET nov RET.

Setup

Make sure you have an unzip executable on PATH, otherwise the extraction of EPUB files will fail. If you for some reason have unzip in a non-standard location, customize nov-unzip-program to its path. You'll also need an Emacs compiled with libxml2 support, otherwise rendering will fail.

Put the following in your init file:

(add-to-list 'auto-mode-alist '("\\.epub\\'" . nov-mode))

Customization

While the defaults make for an acceptable reading experience, it can be improved with any of the following changes:

Default font

To change the default font, use M-x customize-face RET variable-pitch, pick a different family, save and apply. If you dislike globally customizing that face, add the following to your init file:

(defun my-nov-font-setup ()
  (face-remap-add-relative 'variable-pitch :family "Liberation Serif"
                                           :height 1.0))
(add-hook 'nov-mode-hook 'my-nov-font-setup)

To completely disable the variable pitch font, customize nov-variable-pitch to nil. Text will be displayed with the default face instead which should be using a monospace font.

Text width

By default text is filled by the window width. You can customize nov-text-width to a number of columns to change that:

(setq nov-text-width 80)

It's also possible to set it to t to inhibit text filling, this can be used in combination with visual-line-mode and packages such as visual-fill-column to implement more flexible filling:

(setq nov-text-width t)
(setq visual-fill-column-center-text t)
(add-hook 'nov-mode-hook 'visual-line-mode)
(add-hook 'nov-mode-hook 'visual-fill-column-mode)

Rendering

In case you're not happy with the rendering at all, you can either use nov-pre-html-render-hook and nov-post-html-render-hook to adjust the HTML before and after rendering or use your own rendering function by customizing nov-render-html-function to one that replaces HTML in a buffer with something nicer than the default output.

Here's an advanced example of text justification with the justify-kp package:

(require 'justify-kp)
(setq nov-text-width t)

(defun my-nov-window-configuration-change-hook ()
  (my-nov-post-html-render-hook)
  (remove-hook 'window-configuration-change-hook
               'my-nov-window-configuration-change-hook
               t))

(defun my-nov-post-html-render-hook ()
  (if (get-buffer-window)
      (let ((max-width (pj-line-width))
            buffer-read-only)
        (save-excursion
          (goto-char (point-min))
          (while (not (eobp))
            (when (not (looking-at "^[[:space:]]*$"))
              (goto-char (line-end-position))
              (when (> (shr-pixel-column) max-width)
                (goto-char (line-beginning-position))
                (pj-justify)))
            (forward-line 1))))
    (add-hook 'window-configuration-change-hook
              'my-nov-window-configuration-change-hook
              nil t)))

(add-hook 'nov-post-html-render-hook 'my-nov-post-html-render-hook)

This customization yields the following look:

Usage

Open the EPUB file with C-x C-f ~/novels/novel.epub, scroll with SPC and switch chapters with n and p. More keybinds can be looked up with F1 m.

Bugs

Invalid EPUB documents are not supported. Please use epubcheck to validate yours when running into an error.

In case the bug is specific to an EPUB document, please send attach it to your email. I'll try my best to figure out the error, but chances are you can figure it out as well by using the source view (bound to v for the current document and V for the content file) to spot the problematic XML.

Alternatives

The first one I've heard of is epubmode.el which is, well, see for yourself. You might find ereader more useful, especially if you're after Org integration and annotation support.