Kepubify converts EPUBs to KEPUBS. Kepubify also includes two standalone utilities which do not depend on kepubify (and don't conflict with Calibre): covergen (which pre-generates cover images), and seriesmeta (which updates Calibre or EPUB3 series metadata).
Usage: kepubify [OPTIONS] PATH [PATH]... Options: -c, --css string custom CSS to add to ebook --fullscreen-reading-fixes enable fullscreen reading bugfixes based on https://www.mobileread.com/forums/showpost.php?p=3113460&postcount=16 -h, --help show this help text --hyphenate force enable hyphenation --inline-styles inline all stylesheets (for working around certain bugs) --no-hyphenate force disable hyphenation -o, --output string the directory to place the converted files (default ".") -r, --replace stringArray find and replace on all html files (repeat any number of times) (format: find|replace) -u, --update don't reconvert files which have already been converted -v, --verbose show extra information in output --version show the version Arguments: PATH is the path to an epub file or directory to convert. If it is a directory, the converted dir is the name of the dir with the suffix _converted. If the path is a file, the converted file has the extension .kepub.epub.
Seriesmeta updates series metadata for sideloaded books. New: Seriesmeta now supports updating metadata for unimported books, so you don't have to connect twice (this is implemented using SQLite triggers). A reboot may be required in some cases for the updated metadata to appear.
Seriesmeta works on EPUB and KEPUB books, and does not conflict with Calibre
(unless persistence is used, in which case seriesmeta will take precedence). It
will detect Calibre (
meta[name=calibre:series]) and EPUB3
meta[property=belongs-to-collection]) series metadata.
Usage: seriesmeta [OPTIONS] [KOBO_PATH] Options: -h, --help Show this help message -p, --no-persist Don't ensure metadata is always set (this will cause series metadata to be lost if opening a book after an import but before a reboot) -n, --no-replace Don't replace existing series metadata (you probably don't want this option) -u, --uninstall Uninstall seriesmeta table and hooks (imported series metadata will be left untouched) Arguments: KOBO_PATH is the path to the Kobo eReader. If not specified, seriesmeta will try to automatically detect the Kobo.
Covergen (re)generates cover images for nickel, with optional stretching to fit a specific aspect ratio (I use 1.5). This speeds up browsing the library, and if stretching is used, will also make it more consistent. In addition, covergen is useful when the automatically generated cover images are not satisfactory (too small, white margins, etc).
Covergen works on EPUB and KEPUB books, and does not conflict with Calibre or any
other tool. It is also quite lenient about the way the cover image is referenced
by the book. The following methods are supported:
meta[name=cover] with the path
as the content,
meta[name=cover] with a manifest id reference as the content, and
manifest>item[properties=cover-image] with the image path as the href. Each
detected path can be relative to the epub root or to the package document.
Covergen does not support the external SD on older devices, and will ignore it.
The N3_LIBRARY_FULL, N3_LIBRARY_LIST, and N3_LIBRARY_GRID images are generated using the same resizing algorithm as nickel (see koboutils for more info).
Usage: covergen [OPTIONS] [KOBO_PATH] Options: -a, --aspect-ratio float Stretch the covers to fit a specific aspect ratio (for example 1.3, 1.5, 1.6) -h, --help Show this help message -m, --method string Resize algorithm to use (bilinear, bicubic, lanczos2, lanczos3) (default "lanczos3") -r, --regenerate Re-generate all covers Arguments: KOBO_PATH is the path to the Kobo eReader. If not specified, covergen will try to automatically detect the Kobo.