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;;; my-epub.el -- epub utils -*- lexical-binding: t -*-
;; Copyright (C) 2025 Free Software Foundation, Inc.
;; Author: Yuchen Pei <id@ypei.org>
;; Package-Requires: ((emacs "30.1"))
;; This file is part of dotted.
;; dotted is free software: you can redistribute it and/or modify it under
;; the terms of the GNU Affero General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; dotted is distributed in the hope that it will be useful, but WITHOUT
;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
;; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General
;; Public License for more details.
;; You should have received a copy of the GNU Affero General Public
;; License along with dotted. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; epub utils.
;;; Code:
(defun my-epub-content-file-name (file-name)
(with-temp-buffer
(if (eq 0 (call-process "unzip" nil t nil
"-p" file-name "META-INF/container.xml"))
(let ((dom (libxml-parse-xml-region (point-min) (point-max))))
(dom-attr
(dom-by-tag
(dom-by-tag (dom-by-tag dom 'container) 'rootfiles)
'rootfile)
'full-path))
(message "Failed to extract container.xml: %s" (buffer-string))
nil)))
(defun my-epub-metadata (file-name)
"Get metadata of an epub file."
(when-let ((content-file-name (my-epub-content-file-name file-name)))
(with-temp-buffer
(call-process "unzip" nil t nil "-p" file-name content-file-name)
(let* ((dom (libxml-parse-xml-region (point-min) (point-max)))
(metadata (dom-by-tag dom 'metadata))
(title (dom-text (dom-by-tag metadata 'title)))
(authors (dom-texts (dom-by-tag metadata 'creator) ", "))
(identifier
(replace-regexp-in-string
"[^0-9,]" ""
(dom-texts
(seq-filter
(lambda (node)
(or (equal "ISBN" (dom-attr node 'scheme))
(string-match-p "^[0-9]+$" (dom-text node))))
(dom-by-tag metadata 'identifier))
",")))
(date (replace-regexp-in-string
"[^0-9]" ""
(dom-text (dom-by-tag metadata 'date))))
(year (substring date 0 (min 4 (length date)))))
`((title . ,title)
(authors . ,authors)
(year . ,year)
(identifier . ,identifier))
;; (pp metadata)
))
))
;; generate epub
(defun my-epub-create (dir title author)
"Create an epub by concatenating htmls in DIR."
(let* ((name
(file-name-nondirectory (directory-file-name dir)))
(tmpdir
(make-temp-file (format "/tmp/%s.epub." name) t))
(files (directory-files dir nil directory-files-no-dot-files-regexp)))
(my-epub--create-mimetype tmpdir)
(my-epub--create-container tmpdir)
(my-epub--create-opf tmpdir files title author)
(my-epub--create-toc tmpdir files title)
(my-epub--add-html
tmpdir
(directory-files dir t directory-files-no-dot-files-regexp))
(my-epub--zip tmpdir name)
))
(defun my-epub--create-mimetype (dir)
(with-temp-buffer
(insert "application/epub+zip")
(write-file (file-name-concat dir "mimetype"))))
(defun my-epub--create-container (dir)
(with-temp-buffer
(insert
"<?xml version=\"1.0\"?>
<container version=\"1.0\" xmlns=\"urn:oasis:names:tc:opendocument:xmlns:container\">
<rootfiles>
<rootfile full-path=\"OEBPS/content.opf\" media-type=\"application/oebps-package+xml\"/>
</rootfiles>
</container>")
(make-directory
(file-name-concat dir "META-INF"))
(write-file (file-name-concat dir "META-INF/container.xml"))))
(defun my-epub--create-opf (dir files title author)
(with-temp-buffer
(insert
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>" "\n")
(dom-print
`(package
((unique-identifier . "BookID")
(version . "2.0"))
(metadata nil
(title nil ,title)
(creator nil ,author)
(language nil "en")
(identifier
((id . "BookID"))
"Hello ID"))
(manifest
nil
(item ((id . "ncx")
(href . "toc.ncx")
(media-type . "application/x-dtbncx+xml")))
,@(seq-map
(lambda (file)
`(item ((id . ,file)
(href . ,file)
(media-type . "application/xhtml+xml"))))
files))
(spine
((toc . "ncx"))
,@(seq-map
(lambda (file)
`(itemref ((idref . ,file))))
files)))
t t)
(make-directory
(file-name-concat dir "OEBPS"))
(write-file (file-name-concat dir "OEBPS/content.opf"))
(message (buffer-string))))
(defun my-epub--create-toc (dir files title)
(with-temp-buffer
(insert "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" "\n")
(dom-print
`(ncx nil
(docTitle nil
(text nil ,title))
(navMap
nil
,@(seq-map
(lambda (file)
`(navPoint nil
(content ((src . ,file)))))
files)))
t t)
(write-file (file-name-concat dir "OEBPS/toc.ncx"))))
(defun my-epub--add-html (dir files)
(seq-do
(lambda (file)
(copy-file file (file-name-concat dir "OEBPS/")))
files))
(defun my-epub--zip (dir name)
(let ((default-directory dir))
(call-process "zip" nil nil nil "-r" (format "/tmp/%s.epub" name) ".")))
(provide 'my-epub)
;;; my-epub.el ends here
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