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;;; belf.el -- Bookshelf, ebook library management -*- lexical-binding: t -*-
;; Copyright (C) 2025 Free Software Foundation, Inc.
;; Author: Yuchen Pei <id@ypei.org>
;; Package-Requires: ((emacs "29.4"))
;; 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:
;; Bookshelf, ebook library management.
;;; Code:
(require 'tabulated-list)
(require 'infobox)
(defvar-keymap belf-mode-map
:parent tabulated-list-mode-map
"F" #'belf-toggle-follow-mode
"d" #'belf-show-in-dired
"i" #'belf-book-infobox-at-point
"n" #'belf-next-line
"o" #'belf-open-book-other-window
"p" #'belf-previous-line
"RET" #'belf-open-book
)
(define-derived-mode belf-mode tabulated-list-mode "Bookshelf"
"Major mode for browsing a list of books."
(setq tabulated-list-format
[("Authors" 25 t)
("Title" 48 t)
("Year" 4 t)])
(setq tabulated-list-padding 2)
(tabulated-list-init-header)
(setq revert-buffer-function #'belf-list-refresh-contents)
(hl-line-mode))
(defun belf-list-books ()
(interactive)
(let ((buf (get-buffer-create "*Bookshelf*")))
(with-current-buffer buf
(belf-mode)
(belf-list-refresh-contents))
(pop-to-buffer-same-window buf)))
(defun belf-list-refresh-contents (&rest _)
(setq-local tabulated-list-entries (belf-parse-all-file-names))
(tabulated-list-print))
(defvar belf-dir "~/Documents" "Directory of books.")
(defun belf-parse-all-file-names ()
(seq-filter
#'identity
(seq-map
(lambda (f)
(when-let ((parsed (belf-parse-file-name f)))
(let-alist parsed
(list f (vector .authors .title .year)))))
(directory-files belf-dir t "\\.\\(epub\\|pdf\\|mobi\\|cbr\\|djvu\\)$"))))
(defun belf-parse-file-name (file-name)
(let ((base (file-name-base file-name)))
(when (string-match "^\\(.*?\\) - \\(.*\\) (\\([0-9]*\\))" base)
`((authors . ,(match-string 1 base))
(title . ,(match-string 2 base))
(year . ,(match-string 3 base))))))
(defun belf-book-infobox (file-name)
(interactive)
(belf-book-render-info (belf-exiftool-info file-name) file-name))
(defvar belf-exiftool-program "exiftool" "The exiftool program.")
(defun belf-exiftool-info (file-name)
"Given a video URL, return an alist of its properties."
(with-temp-buffer
(call-process belf-exiftool-program nil t nil "-j" file-name)
(let ((start (point)))
(call-process-region
nil nil "jq" nil t nil
".[0]|pick(.Title, .Author, .Creator, .Keywords, .Subject, .Publisher, .Identifier, .Series, .Title_sort, .Author_sort, .PageCount, .ISBN, .Language, .FileType, .Description)")
(goto-char start)
(json-read)))
)
(defun belf-book-cover (file-name)
"Get book cover.
First look for an image file with the same file name.
Then for PDF, extract the first page.
For EPUB, looks for a cover image in the file. If not found, extract the first page."
(cond ((file-exists-p (file-name-with-extension file-name "jpg"))
(format "file://%s" (file-name-with-extension file-name "jpg")))
(t nil)))
(defun belf-book-infobox-at-point ()
(interactive)
(let ((help-window-select (not belf-follow-mode)))
(belf-book-infobox (tabulated-list-get-id)))
)
(defun belf-book-render-info (info file-name)
(setf (alist-get 'Title info)
(concat (alist-get 'Title info)
" -- "
(buttonize
"xdg-open"
(lambda (_) (call-process "xdg-open" nil 0 nil file-name)))
" " (buttonize "find-file" (lambda (_) (find-file file-name))))
(alist-get 'Thumbnail info)
(belf-book-cover file-name)
(alist-get 'Description info)
(when-let ((text (alist-get 'Description info)))
(with-temp-buffer
(insert text)
(shr-render-region (point-min) (point-max))
(goto-char (point-min))
(insert "\n")
(buffer-string))))
(infobox-render
(infobox-translate info (infobox-default-specs info))
`(belf-book-infobox ,file-name)
(called-interactively-p 'interactive)))
(defvar belf-follow-mode nil "Whether follow mode is on.")
(defun belf-toggle-follow-mode ()
(interactive)
(setq belf-follow-mode (not belf-follow-mode)))
(defun belf-previous-line ()
(interactive)
(previous-line)
(when belf-follow-mode
(belf-book-infobox-at-point)))
(defun belf-next-line ()
(interactive)
(next-line)
(when belf-follow-mode
(belf-book-infobox-at-point)))
(defun belf-show-in-dired ()
(interactive)
(dired-jump-other-window (tabulated-list-get-id)))
(defun belf-open-book ()
(interactive)
(find-file (tabulated-list-get-id)))
(defun belf-open-book-other-window ()
(interactive)
(find-file-other-window (tabulated-list-get-id)))
(provide 'belf)
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