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;;; jao-pdf.el --- utilities for pdf files -*- lexical-binding: t; -*-
;; Copyright (C) 2022 jao
;; Author: jao <mail@jao.io>
;; Keywords: docs
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program 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 General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Some niceties for PDFs:
;;
;; - Using mutools, we can extract the outline of PDFs, and tell back the
;; section title of a given page.
;; - Interoperability with zathura.
(require 'jao-doc-session)
;;; PDF info
(declare-function 'pdf-info-outline "pdf-info")
(defvar-local jao-pdf--outline nil)
(defun jao-pdf-is-pdf-file (file)
"Simply checks the FILE extension."
(string-match-p ".*\\.pdf$" file))
(defun jao-pdf-title-to-file-name (title)
"Convert a title, possibly with embedded spaces, to a PDF filename."
(concat (mapconcat 'downcase (split-string title nil t) "-") ".pdf"))
(defvar jao-pdf--outline-rx
".+\\(\t+\\)\"\\(.+\\)\"\t#\\(?:page=\\)?\\([0-9]+\\)")
(defun jao-pdf-outline (file-name)
"Return an alist describing the given FILE-NAME (or current if nil).
The result is cached as a local buffer variable."
(if (derived-mode-p 'pdf-view-mode)
(pdf-info-outline)
(let* ((outline nil)
(fn (or file-name (buffer-file-name)))
(fn (shell-quote-argument (expand-file-name fn))))
(with-temp-buffer
(insert (shell-command-to-string (format "mutool show %s outline" fn)))
(goto-char (point-min))
(while (re-search-forward jao-pdf--outline-rx nil t)
(push `((level . ,(length (match-string 1)))
(title . ,(match-string 2))
(page . ,(string-to-number (match-string 3))))
outline)))
(nreverse outline))))
(defun jao-pdf-title (&optional fname)
(if (or fname (not (derived-mode-p 'doc-view-mode 'pdf-view-mode)))
(let ((base (file-name-base (or fname (buffer-file-name)))))
(capitalize (replace-regexp-in-string "-" " " base)))
(or (jao-pdf-section-title)
(when buffer-file-name (jao-pdf-title buffer-file-name)))))
(defun jao-pdf-section-title (&optional page file-name)
(when (not jao-pdf--outline)
(setq-local jao-pdf--outline (jao-pdf-outline file-name)))
(let ((page (or page
(and (derived-mode-p 'doc-view-mode) (doc-view-current-page))
(and (derived-mode-p 'pdf-view) (pdf-view-current-page))))
(outline jao-pdf--outline)
(cur-page 0)
(cur-title (jao-pdf-title (or file-name buffer-file-name "title"))))
(while (and (car outline) (< cur-page page))
(setq cur-page (cdr (assoc 'page (car outline))))
(when (<= cur-page page)
(setq cur-title (cdr (assoc 'title (car outline)))))
(setq outline (cdr outline)))
(replace-regexp-in-string "[[:blank:]]+" " " cur-title)))
;;; zathura interop
(defun jao-pdf-zathura-open-cmd (file page &optional suffix)
(let ((page (if page (format "-P %s" page) "")))
(format "zathura %s %s %s" file page (or suffix ""))))
;; e.g. "~/org/doc/write-yourself-a-scheme-in-48-hours.pdf [96 (96/138)]"
(defun jao-pdf-zathura-file-info (title)
(when (string-match "\\(.+\\) \\[\\(.+\\) (\\([0-9]+\\)/\\([0-9]+\\))\\]"
title)
(list (expand-file-name (match-string 1 title))
(string-to-number (match-string 3 title))
(string-to-number (match-string 4 title))
(match-string 2 title))))
(defun jao-pdf--zathura-link (info)
(when-let* ((file (car info))
(page (cadr info))
(no (or (car (last info)) page))
(fn (file-name-nondirectory file))
(lnk (format "doc:%s::%s" fn page))
(desc (format "%s (p. %s)" (jao-pdf-section-title page file) no)))
(org-make-link-string lnk desc)))
(defun jao-pdf-zathura-org-link (title)
(jao-pdf--zathura-link (jao-pdf-zathura-file-info title)))
(provide 'jao-pdf)
;;; jao-pdf.el ends here
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