├── LICENSE.txt ├── README.org └── pdf-drop-mode.el /LICENSE.txt: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.org: -------------------------------------------------------------------------------- 1 | * Documentation 2 | 3 | ~pdf-drop-mode~ is a convenient mode that search for the [[https://en.wikipedia.org/wiki/Digital_object_identifier][DOI]] of any file that is 4 | dropped onto a buffer. To do that, the mode searches the DOI using several 5 | different methods (whose order can be specified): 6 | 7 | 1. Look at the file metadata to check if a DOI is attached using exiftool 8 | (whose path can be specified). 9 | 10 | 2. Search the content of the file to try to locate a DOI regex on the first 11 | page (PDF is transformed into text using the pdftotext utility). 12 | 13 | 3. Search again the metadata to try to find the title and query the crossref 14 | database to get a corresponding DOI. 15 | 16 | 4. Ask the user to enter the title of the file and query the crossref database 17 | to try to get a correspondong DOI. 18 | 19 | If all methods failed, then the search has failed. When search finishes, a user-defined function is called with the filename and 20 | the DOI as arguments. 21 | 22 | ** Installation 23 | 24 | #+begin_src emacs-lisp 25 | 26 | (straight-use-package 27 | '(pdf-drop-mode :type git :host github :repo "rougier/pdf-drop-mode")) 28 | 29 | #+end_src 30 | 31 | * Usage 32 | 33 | #+begin_src emacs-lisp 34 | (require 'pdf-drop-mode) 35 | 36 | (defun my/pdf-process (file doi) 37 | (message "%s : %s" file doi)) 38 | 39 | (setq pdf-drop-search-hook #'my/pdf-process) 40 | (pdf-drop-mode) 41 | 42 | #+end_src 43 | 44 | You can then drag and drop a PDF onto the buffer and the DOI should be displayed. 45 | -------------------------------------------------------------------------------- /pdf-drop-mode.el: -------------------------------------------------------------------------------- 1 | ;;; pdf-drop-mode.el --- Get DOI from PDF files dropped onto a buffer -*- lexical-binding: t -*- 2 | 3 | ;; Copyright (C) 2022 Nicolas P. Rougier 4 | 5 | ;; Author: Nicolas P. Rougier 6 | ;; Homepage: https://github.com/rougier/pdf-drop-mode 7 | ;; Keywords: convenience 8 | ;; Version: 0.2.0 9 | 10 | ;; Package-Requires: ((emacs "27.1")) 11 | 12 | ;; This file is not part of GNU Emacs. 13 | 14 | ;; This file is free software; you can redistribute it and/or modify 15 | ;; it under the terms of the GNU General Public License as published by 16 | ;; the Free Software Foundation; either version 3, or (at your option) 17 | ;; any later version. 18 | 19 | ;; This file is distributed in the hope that it will be useful, 20 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of 21 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 | ;; GNU General Public License for more details. 23 | 24 | ;; For a full copy of the GNU General Public License 25 | ;; see . 26 | 27 | ;;; Documentation 28 | ;; 29 | ;; pdf-drop-mode is a convenient mode that search for the identification (DOI or 30 | ;; axiv-id) of any PDF file that is dropped onto a buffer. To do that, the mode 31 | ;; search the identification using several different methods (whose order can be 32 | ;; specified): 33 | ;; 34 | ;; - doi/metadata: search DOI in PDF metadata tags (using exiftool) 35 | ;; - doi/content: search the content of the file to try to locate a DOI regex on 36 | ;; the first page (PDF is transformed into text using the pdftotext 37 | ;; utility) 38 | ;; - doi/title: ask the user to enter the title of the file and query the crossref 39 | ;; database to try to get a correspondong DOI. 40 | ;; - doi/user: ask user to enter the DOI of the PDF. 41 | ;; - arxiv/content: search the content of the file to try to locate a arxiv-id regex 42 | ;; on the first page (PDF is transformed into text using the 43 | ;; pdftotext utility) 44 | ;; - arxiv/user: ask user to enter the arxiv-id of the PDF. 45 | ;; 46 | ;; If a method succeeds, a user-defined hook is ran with the filename and the ID 47 | ;; as arguments (ID is a cons (ID-type . ID)). Else, search has failed. 48 | 49 | 50 | ;;; News 51 | 52 | ;; Version 0.2.0 53 | ;; - API modification for taling into account arxiv papers. 54 | ;; - arxiv papers are now identified. 55 | 56 | ;; Version 0.1.0 57 | ;; Initial release 58 | 59 | ;;; Code: 60 | (require 'url-http) 61 | 62 | (defcustom pdf-drop-pdftotext-path "pdftotext" 63 | "Path to the pdftotext executable (used to extract DOI from the 64 | content of a pdf)." 65 | :type 'file) 66 | 67 | (defcustom pdf-drop-exiftool-path "exiftool" 68 | "Path to the exiftool executable (used to extract TITLE from 69 | pdf metadata)." 70 | :type 'file) 71 | 72 | (defcustom pdf-drop-search-methods '(doi/metadata 73 | doi/content 74 | arxiv/content 75 | doi/title 76 | doi/user) 77 | "Ordered list of methods to use to get the an identifier (doi or arxiv-id) from a pdf." 78 | :type 'list) 79 | 80 | (defcustom pdf-drop-search-hook nil 81 | "A pointer to a function that is called when a search ends. 82 | Called function is provided with the filename and the associated 83 | doi (or nil) as arguments." 84 | :type 'function) 85 | 86 | ;; This will fail if the DOI is split over two lines. Such case may happend when 87 | ;; pdftotext is used to convert the PDF to text. 88 | (defvar pdf-drop--doi-regex "\\(10\\.[0-9]\\{4,9\\}/[-+._;()/:A-Z0-9]+\\)" 89 | "Regular expressions matching a DOI.") 90 | 91 | (defvar pdf-drop--crossref-search-url "http://search.crossref.org/dois?q=%s&rows=10" 92 | "URL to the crossref search API") 93 | 94 | (defvar pdf-drop--crossref-query-url "http://dx.doi.org/%s" 95 | "URL to the crossref query API") 96 | 97 | ;; Adapted from https://github.com/jkitchin/org-ref (org-ref-arxiv.el) 98 | ;; Copyright (C) 2015-2021 John Kitchin (GPL v2) 99 | (defvar pdf-drop--arxiv-regex "\\(arXiv:\\)\\([0-9]\\{4\\}[.][0-9]\\{4,5\\}\\)\\(v[0-9]+\\)?" 100 | "Regular expressions matching an arxiv-id (new format, 2007).") 101 | 102 | (defvar pdf-drop--arxiv-search-url "https://ui.adsabs.harvard.edu/abs/%s/exportcitation" 103 | "URL to arxiv searh yAPI") 104 | 105 | (defvar pdf-drop--arxiv-query-url "http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:%s" 106 | "URL to the arxiv query API") 107 | 108 | (defun pdf-drop-validate-doi (doi) 109 | "Check if DOI is valid by querying crossref" 110 | 111 | (let* ((url (format "https://hdl.handle.net/%s?noredirect" doi)) 112 | (status (url-http-symbol-value-in-buffer 'url-http-response-status 113 | (url-retrieve-synchronously url)))) 114 | (eq 200 status))) 115 | 116 | ;; Adapted from https://github.com/jkitchin/org-ref (org-ref-arxiv.el) 117 | ;; Copyright (C) 2015-2021 John Kitchin (GPL v2) 118 | (defun pdf-drop-validate-arxiv-id (arxiv-id) 119 | "Check if ARXIV-ID is valid by querying arXiv" 120 | 121 | (let* ((url (format pdf-drop--arxiv-query-url arxiv-id)) 122 | (status (url-http-symbol-value-in-buffer 'url-http-response-status 123 | (url-retrieve-synchronously url)))) 124 | (eq 200 status))) 125 | 126 | ;; Adapted from https://github.com/jkitchin/org-ref (doi-utils.el) 127 | ;; Copyright (C) 2015-2021 John Kitchin (GPL v2) 128 | (defun pdf-drop-get-doi-from-title (title &optional score-threshold) 129 | "Query crossref.org for TITLE and return the corresponding doi. 130 | 131 | When multiple canditates are found, the one with the smallest 132 | levenshtein distance is chosen if its distance to TITLE is less 133 | than SCORE-THRESHOLD. Else, user is asked to choose among 5 best 134 | candidates. If no SCORE-THRESHOLD is given, the first candidate 135 | doi is returned." 136 | 137 | (interactive "sTitle: ") 138 | (with-current-buffer (url-retrieve-synchronously 139 | (format 140 | pdf-drop--crossref-search-url 141 | (url-hexify-string title))) 142 | (save-excursion 143 | (goto-char (point-min)) 144 | (while (re-search-forward "\\|" nil t) 145 | (replace-match "")) 146 | (goto-char (point-min)) 147 | (while (re-search-forward "&" nil t) 148 | (replace-match "&")) 149 | (goto-char (point-min)) 150 | (while (re-search-forward """ nil t) 151 | (replace-match "\\\"" nil t))) 152 | (setq raw-json-string 153 | (buffer-substring url-http-end-of-headers (point-max))) 154 | (setq json-string 155 | (decode-coding-string (encode-coding-string raw-json-string 'utf-8) 'utf-8)) 156 | (setq json-data 157 | (json-read-from-string json-string)) 158 | 159 | (let* (;; (score-threshold (or score-threshold 10)) 160 | (candidates (mapcar (lambda (x) 161 | (let* ((x-full (cdr (assoc 'fullCitation x))) 162 | (x-title (cdr (assoc 'title x))) 163 | (x-display-title (if (string-match "\\([0-9]\\{4\\}\\)" x-full) 164 | (format "%s (%s)" x-title (match-string 1 x-full)) 165 | (format "%s (????)" x-title))) 166 | (x-doi (cdr (assoc 'doi x)))) 167 | (cons x-display-title x-doi))) 168 | json-data)) 169 | (sorted-candidates (sort candidates 170 | #'(lambda (item-1 item-2) 171 | (let ((title-1 (substring (car item-1) 0 -7)) 172 | (title-2 (substring (car item-2) 0 -7))) 173 | (< (string-distance title title-1) 174 | (string-distance title title-2)))))) 175 | (best-match (caar sorted-candidates)) 176 | (best-score (string-distance title (substring best-match 0 -7))) 177 | (selected (if (or (= (length sorted-candidates) 1) 178 | (not score-threshold) 179 | (< best-score score-threshold)) 180 | best-match 181 | (completing-read "Matched title: " sorted-candidates nil nil 182 | (if (< best-score 10) best-match nil)))) 183 | (doi (cdr (assoc selected sorted-candidates)))) 184 | doi))) 185 | 186 | (defun pdf-drop-get-doi-from-content (file) 187 | "Extract doi from a pdf FILE content (after conversion to text)." 188 | 189 | (with-temp-buffer 190 | (let ((status (call-process pdf-drop-pdftotext-path nil '(t nil) nil 191 | "-f" "1" "-l" "1" "-enc" "UTF-8" file "-"))) 192 | (goto-char (point-min)) 193 | (if (and (eq status 0) 194 | (> (buffer-size) 0) 195 | (search-forward-regexp pdf-drop--doi-regex nil t)) 196 | (string-trim (match-string 1) "[ \\t\\n\\r()]+" "[ \\t\\n\\r()]+") 197 | )))) 198 | 199 | (defun pdf-drop-get-tag-from-metadata (file tag) 200 | "Get TAG from file metadata." 201 | 202 | (with-temp-buffer 203 | (let ((status (call-process pdf-drop-exiftool-path nil '(t nil) nil 204 | "-s" "-s" "-s" (concat "-" tag) file))) 205 | (if (and (eq status 0) (> (buffer-size) 0)) 206 | (string-trim (buffer-substring (point-min) (point-max))))))) 207 | 208 | 209 | (defun pdf-drop-get-doi-from-metadata (file) 210 | "Get DOI from file metadata." 211 | 212 | (pdf-drop-get-tag-from-metadata file "DOI")) 213 | 214 | (defun pdf-drop-get-title-from-metadata (file) 215 | "Get TITLE from file metadata." 216 | 217 | (pdf-drop-get-tag-from-metadata file "TITLE")) 218 | 219 | (defun pdf-drop-get-arxiv-id-from-content (file) 220 | "Extract arxiv-id from a pdf FILE content (after conversion to text)." 221 | 222 | (with-temp-buffer 223 | (let ((status (call-process pdf-drop-pdftotext-path nil '(t nil) nil 224 | "-f" "1" "-l" "1" "-enc" "UTF-8" file "-"))) 225 | (goto-char (point-min)) 226 | (if (and (eq status 0) 227 | (> (buffer-size) 0) 228 | (search-forward-regexp pdf-drop--arxiv-regex nil t)) 229 | (string-trim (match-string 2) "[ \\t\\n\\r()]+" "[ \\t\\n\\r()]+"))))) 230 | 231 | (defun pdf-drop--file-dnd-fallback (uri action) 232 | (let ((dnd-protocol-alist 233 | (rassq-delete-all 'pdf-drop--file-dnd-protocol 234 | (copy-alist dnd-protocol-alist)))) 235 | (dnd-handle-one-url nil action uri))) 236 | 237 | (defun pdf-drop--file-dnd-protocol (uri action) 238 | ;; (condition-case nil 239 | ;; (pdf-drop--process (substring uri 7)) 240 | ;; (error 241 | ;; (pdf-drop--file-dnd-fallback uri action)))) 242 | (let ((file (dnd-get-local-file-name uri))) 243 | (pdf-drop--process file))) 244 | 245 | (defun pdf-drop--process (file) 246 | "Try to get the DOI associated to file." 247 | 248 | (let ((file-id)) 249 | (catch 'found 250 | (dolist (method pdf-drop-search-methods) 251 | 252 | (cond ((eq method 'doi/content) 253 | (let ((doi (pdf-drop-get-doi-from-content file))) 254 | (if (and doi (pdf-drop-validate-doi doi)) 255 | (progn 256 | (setq file-id `(doi . ,doi)) 257 | (throw 'found file-id)) 258 | (message "doi/content method failed for %s" file)))) 259 | 260 | ((eq method 'arxiv/content) 261 | (let ((arxiv-id (pdf-drop-get-arxiv-id-from-content file))) 262 | (if (and arxiv-id (pdf-drop-validate-arxiv-id arxiv-id)) 263 | (progn 264 | (setq file-id `(arxiv . ,arxiv-id)) 265 | (throw 'found file-id)) 266 | (message "arxiv/content method failed for %s" file)))) 267 | 268 | ((eq method 'doi/metadata) 269 | (let ((doi (pdf-drop-get-doi-from-metadata file))) 270 | (if (and doi (pdf-drop-validate-doi doi)) 271 | (progn 272 | (setq file-id `(doi . ,doi)) 273 | (throw 'found file-id)) 274 | (message "doi/metadata method failed for %s" file)))) 275 | 276 | ((eq method 'doi/title) 277 | (let ((buffer (find-file file))) 278 | (with-current-buffer buffer 279 | (unwind-protect 280 | (let* ((title (read-string 281 | (format "Enter title for %s: " 282 | (file-name-nondirectory file)))) 283 | (doi (pdf-drop-get-doi-from-title title 5))) 284 | (if (and doi (pdf-drop-validate-doi doi)) 285 | (progn 286 | (setq file-id `(doi . ,doi)) 287 | (throw 'found file-id)) 288 | (message "doi/title method failed for %s" file))) 289 | (kill-buffer buffer))))) 290 | 291 | ((eq method 'doi/user) 292 | (let ((buffer (find-file file))) 293 | (with-current-buffer buffer 294 | (unwind-protect 295 | (let* ((doi (read-string 296 | (format "Enter DOI for %s: " 297 | (file-name-nondirectory file))))) 298 | (if (and doi (pdf-drop-validate-doi doi)) 299 | (progn 300 | (setq file-id `(doi . ,doi)) 301 | (throw 'found file-id)) 302 | (message "doi/user method failed for %s" file))) 303 | (kill-buffer buffer)))))))) 304 | 305 | (if file-id 306 | (progn 307 | (message "ID found: %s" file-id) 308 | (if pdf-drop-search-hook 309 | (apply pdf-drop-search-hook (list file file-id)))) 310 | (message "Search failed for %s" file)))) 311 | 312 | 313 | (defun pdf-drop--bibtex-from-doi (doi) 314 | "Retrieve (raw) bibtex information for DOI using crossref API." 315 | 316 | (let ((url-mime-accept-string "text/bibliography;style=bibtex")) 317 | (with-current-buffer 318 | (url-retrieve-synchronously (format pdf-drop--crossref-query-url doi)) 319 | (decode-coding-string 320 | (buffer-substring (string-match "@" (buffer-string)) (point)) 'utf-8)))) 321 | 322 | 323 | (defun pdf-drop--bibtex-from-arxiv-id (arxiv-id) 324 | "Retrieve (raw) bibtex information for ARXIV-ID item using arxiv API." 325 | 326 | (let* ((arxiv-code 327 | (with-current-buffer 328 | (url-retrieve-synchronously (format pdf-drop--arxiv-query-url arxiv-id)) 329 | (search-forward-regexp "") 330 | (match-string 1))) 331 | (bibtex (when arxiv-code 332 | (with-current-buffer 333 | (url-retrieve-synchronously (format pdf-drop--arxiv-search-url arxiv-code)) 334 | (when (re-search-forward 335 | "\\(.*\\(?:\n.*\\)*?\\(?:\n\\s-*\n\\|\\'\\)\\)" 336 | nil t) 337 | (xml-substitute-special (match-string 1))))))) 338 | bibtex)) 339 | 340 | 341 | (define-minor-mode pdf-drop-mode 342 | "Minor mode that search for the doi of any pdf file dropped onto a buffer." 343 | 344 | :global t 345 | :init-value nil 346 | 347 | (let ((item '("^file:" . pdf-drop--file-dnd-protocol))) 348 | (if pdf-drop-mode 349 | (add-to-list 'dnd-protocol-alist item) 350 | (setq dnd-protocol-alist (remove item dnd-protocol-alist))))) 351 | 352 | 353 | (provide 'pdf-drop-mode) 354 | ;;; pdf-drop-mode.el ends here 355 | 356 | --------------------------------------------------------------------------------