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pdf-info.el
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pdf-info.el
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;;; pdf-info.el --- Extract info from pdf-files via a helper process. -*- lexical-binding: t -*-
;; Copyright (C) 2013, 2014 Andreas Politz
;; Author: Andreas Politz <politza@fh-trier.de>
;; Keywords: files, multimedia
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; This library represents the Lisp side of the epdfinfo server. This
;; program works on a command/response basis, but there should be no
;; need to understand the protocol, since every command has a
;; corresponding Lisp-function (see below under `High level
;; interface').
;;
;; Most of these functions receive a file-or-buffer argument, which
;; may be what it says and defaults to the current buffer. Also, most
;; functions return some sort of alist, with, in most cases,
;; straight-forward key-value-pairs. Though some may be only
;; understandable in the context of Adobe's PDF spec \(Adobe
;; PDF32000\) or the poppler documentation (e.g. annotation flags).
;;
;; If the poppler library is fairly recent (>= 0.19.4, older versions
;; have a bug, which may corrupt the document), annotations maybe
;; modified to a certain degree, deleted and text-annotations created.
;; The state of these modifications is held in the server. In order
;; to realize, annotations retrieved or created are referenced by a
;; unique symbol. Saving these changes creates a new file, the
;; original document is never touched.
;;; Todo:
;;
;; + Close documents at some time (e.g. when the buffer is killed)
;;
;;; Code:
(require 'tq)
(require 'cl-lib)
;; * ================================================================== *
;; * Customizations
;; * ================================================================== *
(defgroup pdf-info nil
"Extract infos from pdf-files via a helper process."
:group 'pdf-tools)
(defcustom pdf-info-epdfinfo-program
(let ((executable (if (eq system-type 'windows-nt)
"epdfinfo.exe" "epdfinfo"))
(default-directory
(or (and load-file-name
(file-name-directory load-file-name))
default-directory)))
(cl-labels ((try-directory (directory)
(and (file-directory-p directory)
(file-executable-p (expand-file-name executable directory))
(expand-file-name executable directory))))
(or (executable-find executable)
;; This works if epdfinfo is in the same place as emacs and
;; the editor was started with an absolute path, i.e. it is
;; meant for Windows/Msys2.
(and (stringp (car-safe command-line-args))
(file-name-directory (car command-line-args))
(try-directory
(file-name-directory (car command-line-args))))
;; If we are running directly from the git repo.
(try-directory (expand-file-name "../server"))
;; Fall back to epdfinfo in the directory of this file.
(expand-file-name executable))))
"Filename of the epdfinfo executable."
:type 'file)
(defcustom pdf-info-epdfinfo-error-filename nil
"Filename for error output of the epdfinfo executable.
If nil, discard any error messages. Useful for debugging."
:type `(choice (const :tag "None" nil)
,@(when (file-directory-p "/tmp/")
'((const "/tmp/epdfinfo.log")))
(file)))
(defcustom pdf-info-log nil
"Whether to log the communication with the server.
If this is non-nil, all communication with the epdfinfo program
will be logged to the buffer \"*pdf-info-log*\"."
:type 'boolean)
(defcustom pdf-info-log-entry-max 512
"Maximum number of characters in a single log entry.
This variable has no effect if `pdf-info-log' is nil."
:type 'integer)
(defcustom pdf-info-restart-process-p 'ask
"What to do when the epdfinfo server died.
This should be one of
nil -- do nothing,
t -- automatically restart it or
ask -- ask whether to restart or not.
If it is `ask', the server quits and you answer no, this variable
is set to nil."
:type '(choice (const :tag "Do nothing" nil)
(const :tag "Restart silently" t)
(const :tag "Always ask" ask)))
(defcustom pdf-info-close-document-hook nil
"A hook ran after a document was closed in the server.
The hook is run in the documents buffer, if it exists. Otherwise
in a `with-temp-buffer' form."
:type 'hook)
;; * ================================================================== *
;; * Variables
;; * ================================================================== *
(defvar pdf-info-asynchronous nil
"If non-nil process queries asynchronously.
More specifically the value should be a function of at 2
arguments \(fn STATUS RESPONSE\), where STATUS is either nil, for
a successful query, or the symbol error. RESPONSE is either the
command's response or the error message. This does not work
recursive, i.e. if function wants to make another asynchronous
query it has to rebind this variable.
Alternatively it may be a list \(FN . ARGS\), in which case FN
will be invoked like \(apply FN STATUS RESPONSE ARGS\).
Also, all pdf-info functions normally returning a response return
nil.
This variable should only be let-bound.")
(defconst pdf-info-pdf-date-regexp
;; Adobe PDF32000.book, 7.9.4 Dates
(eval-when-compile
(concat
;; allow for preceding garbage
;;"\\`"
"[dD]:"
"\\([0-9]\\{4\\}\\)" ;year
"\\(?:"
"\\([0-9]\\{2\\}\\)" ;month
"\\(?:"
"\\([0-9]\\{2\\}\\)" ;day
"\\(?:"
"\\([0-9]\\{2\\}\\)" ;hour
"\\(?:"
"\\([0-9]\\{2\\}\\)" ;minutes
"\\(?:"
"\\([0-9]\\{2\\}\\)" ;seconds
"\\)?\\)?\\)?\\)?\\)?"
"\\(?:"
"\\([+-Zz]\\)" ;UT delta char
"\\(?:"
"\\([0-9]\\{2\\}\\)" ;UT delta hours
"\\(?:"
"'"
"\\([0-9]\\{2\\}\\)" ;UT delta minutes
"\\)?\\)?\\)?"
;; "\\'"
;; allow for trailing garbage
)))
(defvar pdf-info--queue t
"Internally used transmission-queue for the server.
This variable is initially t, telling the code starting the
server, that it never ran.")
;; * ================================================================== *
;; * Process handling
;; * ================================================================== *
(defconst pdf-info-empty-page-data
(eval-when-compile
(concat
"%PDF-1.0\n1 0 obj<</Type/Catalog/Pages 2 0 R>>endobj 2 0"
" obj<</Type/Pages/Kids[3 0 R]/Count 1>>endobj 3 0 obj<</"
"Type/Page/MediaBox[0 0 3 3]>>endobj\nxref\n0 4\n00000000"
"0065535 f\n0000000010 00000 n\n0000000053 00000 n\n00000"
"00102 00000 n\ntrailer<</Size 4/Root 1 0 R>>\nstartxref\n149\n%EOF"))
"PDF data of an empty page.")
(defun pdf-info-process ()
"Return the process object or nil."
(and pdf-info--queue
(not (eq t pdf-info--queue))
(tq-process pdf-info--queue)))
(defun pdf-info-check-epdfinfo (&optional interactive-p)
"Check if the server should be working properly.
Signal an error if some problem was found. Message a
confirmation, if INTERACTIVE-P is non-nil and no problems were
found.
Returns nil."
(interactive "p")
(let ((executable pdf-info-epdfinfo-program))
(unless (stringp executable)
(error "pdf-info-epdfinfo-program is unset or not a string"))
(unless (file-executable-p executable)
(error "pdf-info-epdfinfo-program is not executable"))
(when pdf-info-epdfinfo-error-filename
(unless (and (stringp pdf-info-epdfinfo-error-filename)
(file-writable-p pdf-info-epdfinfo-error-filename))
(error "pdf-info-epdfinfo-error-filename should contain writable filename")))
(let* ((default-directory (expand-file-name "~/"))
(cmdfile (make-temp-file "commands"))
(pdffile (make-temp-file "empty.pdf"))
(tempdir (make-temp-file "tmpdir" t))
(process-environment (cons (concat "TMPDIR=" tempdir)
process-environment)))
(unwind-protect
(with-temp-buffer
(with-temp-file pdffile
(set-buffer-multibyte nil)
(insert pdf-info-empty-page-data))
(with-temp-file cmdfile
(insert (format "renderpage:%s:1:100\nquit\n"
(pdf-info-query--escape pdffile))))
(unless (= 0 (apply #'call-process
executable cmdfile (current-buffer)
nil (when pdf-info-epdfinfo-error-filename
(list pdf-info-epdfinfo-error-filename))))
(error "Error running `%s': %s"
pdf-info-epdfinfo-program
(buffer-string))))
(when (file-exists-p cmdfile)
(delete-file cmdfile))
(when (file-exists-p pdffile)
(delete-file pdffile))
(when (file-exists-p tempdir)
(delete-directory tempdir t)))))
(when interactive-p
(message "The epdfinfo program appears to be working."))
nil)
(defun pdf-info-process-assert-running (&optional force)
"Assert a running process.
If it never ran, i.e. `pdf-info-process' is t, start it
unconditionally.
Otherwise, if FORCE is non-nil start it, if it is not running.
Else restart it with respect to the variable
`pdf-info-restart-process-p', which see.
If getting the process to run fails, this function throws an
error."
(interactive "P")
(unless (and (processp (pdf-info-process))
(eq (process-status (pdf-info-process))
'run))
(when (pdf-info-process)
(tq-close pdf-info--queue)
(setq pdf-info--queue nil))
(unless (or force
(eq pdf-info--queue t)
(and (eq pdf-info-restart-process-p 'ask)
(not noninteractive)
(y-or-n-p "The epdfinfo server quit, restart it ? "))
(and pdf-info-restart-process-p
(not (eq pdf-info-restart-process-p 'ask))))
(when (eq pdf-info-restart-process-p 'ask)
(setq pdf-info-restart-process-p nil))
(error "The epdfinfo server quit"))
(pdf-info-check-epdfinfo)
(let* ((process-connection-type) ;Avoid 4096 Byte bug #12440.
(default-directory "~")
(proc (apply #'start-process
"epdfinfo" " *epdfinfo*" pdf-info-epdfinfo-program
(when pdf-info-epdfinfo-error-filename
(list pdf-info-epdfinfo-error-filename)))))
(with-current-buffer " *epdfinfo*"
(erase-buffer))
(set-process-query-on-exit-flag proc nil)
(set-process-coding-system proc 'utf-8-unix 'utf-8-unix)
(setq pdf-info--queue (tq-create proc))))
pdf-info--queue)
(when (< emacs-major-version 27)
(advice-add 'tq-process-buffer :around #'pdf-info--tq-workaround))
(defun pdf-info--tq-workaround (orig-fun tq &rest args)
"Fix a bug in trunk where the wrong callback gets called.
ORIG-FUN is the callback that should be called. TQ and ARGS are
the transmission-queue and arguments to the callback."
;; FIXME: Make me iterative.
(if (not (equal (car (process-command (tq-process tq)))
pdf-info-epdfinfo-program))
(apply orig-fun tq args)
(let ((buffer (tq-buffer tq))
done)
(when (buffer-live-p buffer)
(set-buffer buffer)
(while (and (not done)
(> (buffer-size) 0))
(setq done t)
(if (tq-queue-empty tq)
(let ((buf (generate-new-buffer "*spurious*")))
(copy-to-buffer buf (point-min) (point-max))
(delete-region (point-min) (point))
(pop-to-buffer buf nil)
(error "Spurious communication from process %s, see buffer %s"
(process-name (tq-process tq))
(buffer-name buf)))
(goto-char (point-min))
(when (re-search-forward (tq-queue-head-regexp tq) nil t)
(setq done nil)
(let ((answer (buffer-substring (point-min) (point)))
(fn (tq-queue-head-fn tq))
(closure (tq-queue-head-closure tq)))
(delete-region (point-min) (point))
(tq-queue-pop tq)
(condition-case-unless-debug err
(funcall fn closure answer)
(error
(message "Error while processing tq callback: %s"
(error-message-string err))))))))))))
;; * ================================================================== *
;; * Sending and receiving
;; * ================================================================== *
(defun pdf-info-query (cmd &rest args)
"Query the server using CMD and ARGS."
(pdf-info-process-assert-running)
(unless (symbolp cmd)
(setq cmd (intern cmd)))
(let* ((query (concat (mapconcat #'pdf-info-query--escape
(cons cmd args) ":")
"\n"))
(callback
(lambda (closure response)
(cl-destructuring-bind (status &rest result)
(pdf-info-query--parse-response cmd response)
(pdf-info-query--log response)
(let* (pdf-info-asynchronous)
(if (functionp closure)
(funcall closure status result)
(apply (car closure) status result (cdr closure)))))))
response status done
(closure (or pdf-info-asynchronous
(lambda (s r)
(setq status s response r done t)))))
(pdf-info-query--log query t)
(tq-enqueue
pdf-info--queue query "^\\.\n" closure callback)
(unless pdf-info-asynchronous
(while (and (not done)
(eq (process-status (pdf-info-process))
'run))
(accept-process-output (pdf-info-process) 0.01))
(when (and (not done)
(not (eq (process-status (pdf-info-process))
'run))
(not (eq cmd 'quit)))
(error "The epdfinfo server quit unexpectedly"))
(cond
((null status) response)
((eq status 'error)
(error "epdfinfo: %s" response))
((eq status 'interrupted)
(error "epdfinfo: Command was interrupted"))
(t
(error "Internal error: invalid response status"))))))
(defun pdf-info-interrupt ()
"FIXME: This command does currently nothing."
(when (and (processp (pdf-info-process))
(eq (process-status (pdf-info-process))
'run))
(signal-process (pdf-info-process) 'SIGUSR1)))
(defun pdf-info-query--escape (arg)
"Escape ARG for transmission to the server."
(if (null arg)
(string)
(with-current-buffer (get-buffer-create " *pdf-info-query--escape*")
(erase-buffer)
(insert (format "%s" arg))
(goto-char 1)
(while (not (eobp))
(cond
((memq (char-after) '(?\\ ?:))
(insert ?\\))
((eq (char-after) ?\n)
(delete-char 1)
(insert ?\\ ?n)
(backward-char)))
(forward-char))
(buffer-substring-no-properties 1 (point-max)))))
(defmacro pdf-info-query--read-record ()
"Read a single record of the response in current buffer."
`(let (records done (beg (point)))
(while (not done)
(cl-case (char-after)
(?\\
(delete-char 1)
(if (not (eq (char-after) ?n))
(forward-char)
(delete-char 1)
(insert ?\n)))
((?: ?\n)
(push (buffer-substring-no-properties
beg (point)) records)
(forward-char)
(setq beg (point)
done (bolp)))
(t (forward-char))))
(nreverse records)))
(defun pdf-info-query--parse-response (cmd response)
"Parse one epdfinfo RESPONSE to CMD.
Returns a cons \(STATUS . RESULT\), where STATUS is one of nil
for a regular response, error for an error \(RESULT contains the
error message\) or interrupted, i.e. the command was
interrupted."
(with-current-buffer
(get-buffer-create " *pdf-info-query--parse-response*")
(erase-buffer)
(insert response)
(goto-char 1)
(cond
((looking-at "ERR\n")
(forward-line)
(cons 'error (buffer-substring-no-properties
(point)
(progn
(re-search-forward "^\\.\n")
(1- (match-beginning 0))))))
((looking-at "OK\n")
(let (result)
(forward-line)
(while (not (and (= (char-after) ?.)
(= (char-after (1+ (point))) ?\n)))
(push (pdf-info-query--read-record) result))
(cons nil (pdf-info-query--transform-response
cmd (nreverse result)))))
((looking-at "INT\n")
(cons 'interrupted nil))
(t
(cons 'error "Invalid server response")))))
(defun pdf-info-query--transform-response (cmd response)
"Transform a RESPONSE to CMD into a Lisp form."
(cl-case cmd
(open nil)
(close (equal "1" (caar response)))
(number-of-pages (string-to-number (caar response)))
(charlayout
(mapcar (lambda (elt)
(cl-assert (= 1 (length (cadr elt))) t)
`(,(aref (cadr elt) 0)
,(mapcar #'string-to-number
(split-string (car elt) " " t))))
response))
(regexp-flags
(mapcar (lambda (elt)
(cons (intern (car elt))
(string-to-number (cadr elt))))
response))
((search-string search-regexp)
(mapcar
(lambda (r)
`((page . ,(string-to-number (nth 0 r)))
(text . ,(let (case-fold-search)
(pdf-util-highlight-regexp-in-string
(regexp-quote (nth 1 r)) (nth 2 r))))
(edges . ,(mapcar (lambda (m)
(mapcar #'string-to-number
(split-string m " " t)))
(cddr (cdr r))))))
response))
(outline
(mapcar (lambda (r)
`((depth . ,(string-to-number (pop r)))
,@(pdf-info-query--transform-action r)))
response))
(pagelinks
(mapcar (lambda (r)
`((edges .
,(mapcar #'string-to-number ;area
(split-string (pop r) " " t)))
,@(pdf-info-query--transform-action r)))
response))
(metadata
(let ((md (car response)))
(if (= 1 (length md))
(list (cons 'title (car md)))
(list
(cons 'title (pop md))
(cons 'author (pop md))
(cons 'subject (pop md))
(cons 'keywords-raw (car md))
(cons 'keywords (split-string (pop md) "[\t\n ]*,[\t\n ]*" t))
(cons 'creator (pop md))
(cons 'producer (pop md))
(cons 'format (pop md))
(cons 'created (pop md))
(cons 'modified (pop md))))))
(gettext
(or (caar response) ""))
(getselection
(mapcar (lambda (line)
(mapcar #'string-to-number
(split-string (car line) " " t)))
response))
(features (mapcar #'intern (car response)))
(pagesize
(setq response (car response))
(cons (round (string-to-number (car response)))
(round (string-to-number (cadr response)))))
((getannot editannot addannot)
(pdf-info-query--transform-annotation (car response)))
(getannots
(mapcar #'pdf-info-query--transform-annotation response))
(getattachments
(mapcar #'pdf-info-query--transform-attachment response))
((getattachment-from-annot)
(pdf-info-query--transform-attachment (car response)))
(boundingbox
(mapcar #'string-to-number (car response)))
(synctex-forward-search
(let ((list (mapcar #'string-to-number (car response))))
`((page . ,(car list))
(edges . ,(cdr list)))))
(synctex-backward-search
`((filename . ,(caar response))
(line . ,(string-to-number (cadr (car response))))
(column . ,(string-to-number (cadr (cdar response))))))
(delannot nil)
((save) (caar response))
((renderpage renderpage-text-regions renderpage-highlight)
(pdf-util-munch-file (caar response)))
((setoptions getoptions)
(let (options)
(dolist (key-value response)
(let ((key (intern (car key-value)))
(value (cadr key-value)))
(cl-case key
((:render/printed :render/usecolors)
(setq value (equal value "1"))))
(push value options)
(push key options)))
options))
(pagelabels (mapcar #'car response))
(ping (caar response))
(t response)))
(defun pdf-info-query--transform-action (action)
"Transform ACTION response into a Lisp form."
(let ((type (intern (pop action))))
`((type . ,type)
(title . ,(pop action))
,@(cl-case type
(goto-dest
`((page . ,(string-to-number (pop action)))
(top . ,(and (> (length (car action)) 0)
(string-to-number (pop action))))))
(goto-remote
`((filename . ,(pop action))
(page . ,(string-to-number (pop action)))
(top . ,(and (> (length (car action)) 0)
(string-to-number (pop action))))))
(t `((uri . ,(pop action))))))))
(defun pdf-info-query--transform-annotation (a)
(cl-labels ((not-empty (s)
(if (not (equal s "")) s)))
(let (a1 a2 a3)
(cl-destructuring-bind (page edges type id flags color contents modified &rest rest)
a
(setq a1 `((page . ,(string-to-number page))
(edges . ,(mapcar #'string-to-number
(split-string edges " " t)))
(type . ,(intern type))
(id . ,(intern id))
(flags . ,(string-to-number flags))
(color . ,(not-empty color))
(contents . ,contents)
(modified . ,(pdf-info-parse-pdf-date modified))))
(when rest
(cl-destructuring-bind (label subject opacity popup-edges popup-is-open created
&rest rest)
rest
(setq a2
`((label . ,(not-empty label))
(subject . ,(not-empty subject))
(opacity . ,(let ((o (not-empty opacity)))
(and o (string-to-number o))))
(popup-edges . ,(let ((p (not-empty popup-edges)))
(when p
(mapcar #'string-to-number
(split-string p " " t)))))
(popup-is-open . ,(equal popup-is-open "1"))
(created . ,(pdf-info-parse-pdf-date (not-empty created)))))
(cond
((eq (cdr (assoc 'type a1)) 'text)
(cl-destructuring-bind (icon state is-open)
rest
(setq a3
`((icon . ,(not-empty icon))
(state . ,(not-empty state))
(is-open . ,(equal is-open "1"))))))
((memq (cdr (assoc 'type a1))
'(squiggly highlight underline strike-out))
(setq a3 `((markup-edges
. ,(mapcar (lambda (r)
(mapcar #'string-to-number
(split-string r " " t)))
rest)))))))))
(append a1 a2 a3))))
(defun pdf-info-query--transform-attachment (a)
(cl-labels ((not-empty (s)
(if (not (equal s "")) s)))
(cl-destructuring-bind (id filename description size modified
created checksum file)
a
`((id . ,(intern id))
(filename . ,(not-empty filename))
(description . ,(not-empty description))
(size . ,(let ((n (string-to-number size)))
(and (>= n 0) n)))
(modified . ,(not-empty modified))
(created . ,(not-empty created))
(checksum . ,(not-empty checksum))
(file . ,(not-empty file))))))
(defun pdf-info-query--log (string &optional query-p)
"Log STRING as query/response, depending on QUERY-P.
This is a no-op, if `pdf-info-log' is nil."
(when pdf-info-log
(with-current-buffer (get-buffer-create "*pdf-info-log*")
(buffer-disable-undo)
(let ((pos (point-max))
(window (get-buffer-window)))
(save-excursion
(goto-char (point-max))
(unless (bolp)
(insert ?\n))
(insert
(propertize
(format-time-string "%H:%M:%S ")
'face
(if query-p
'font-lock-keyword-face
'font-lock-function-name-face))
(if (and (numberp pdf-info-log-entry-max)
(> (length string)
pdf-info-log-entry-max))
(concat (substring string 0 pdf-info-log-entry-max)
"...[truncated]\n")
string)))
(when (and (window-live-p window)
(= pos (window-point window)))
(set-window-point window (point-max)))))))
;; * ================================================================== *
;; * Utility functions
;; * ================================================================== *
(defvar doc-view-buffer-file-name)
(defvar doc-view--buffer-file-name)
(defun pdf-info--normalize-file-or-buffer (file-or-buffer)
"Return the PDF file corresponding to FILE-OR-BUFFER.
FILE-OR-BUFFER may be nil, a PDF buffer, the name of a PDF buffer
or a PDF file."
(unless file-or-buffer
(setq file-or-buffer
(current-buffer)))
(when (bufferp file-or-buffer)
(unless (buffer-live-p file-or-buffer)
(error "Buffer is not live :%s" file-or-buffer))
(with-current-buffer file-or-buffer
(unless (setq file-or-buffer
(cl-case major-mode
(doc-view-mode
(cond ((boundp 'doc-view-buffer-file-name)
doc-view-buffer-file-name)
((boundp 'doc-view--buffer-file-name)
doc-view--buffer-file-name)))
(pdf-view-mode (pdf-view-buffer-file-name))
(t (buffer-file-name))))
(error "Buffer is not associated with any file :%s" (buffer-name)))))
(unless (stringp file-or-buffer)
(signal 'wrong-type-argument
(list 'stringp 'bufferp 'null file-or-buffer)))
;; is file
(when (file-remote-p file-or-buffer)
(error "Processing remote files not supported :%s"
file-or-buffer))
;; (unless (file-readable-p file-or-buffer)
;; (error "File not readable :%s" file-or-buffer))
(expand-file-name file-or-buffer))
(defun pdf-info-valid-page-spec-p (pages)
"The type predicate for a valid page-spec."
(not (not (ignore-errors (pdf-info-normalize-page-range pages)))))
(defun pdf-info-normalize-page-range (pages)
"Normalize PAGES for sending to the server.
PAGES may be a single page number, a cons \(FIRST . LAST\), or
nil, which stands for all pages.
The result is a cons \(FIRST . LAST\), where LAST may be 0
representing the final page."
(cond
((natnump pages)
(cons pages pages))
((null pages)
(cons 1 0))
((and (natnump (car pages))
(natnump (cdr pages)))
pages)
(t
(signal 'wrong-type-argument
(list 'pdf-info-valid-page-spec-p pages)))))
(defun pdf-info-parse-pdf-date (date)
(when (and date
(string-match pdf-info-pdf-date-regexp date))
(let ((year (match-string 1 date))
(month (match-string 2 date))
(day (match-string 3 date))
(hour (match-string 4 date))
(min (match-string 5 date))
(sec (match-string 6 date))
(ut-char (match-string 7 date))
(ut-hour (match-string 8 date))
(ut-min (match-string 9 date))
(tz 0))
(when (or (equal ut-char "+")
(equal ut-char "-"))
(when ut-hour
(setq tz (* 3600 (string-to-number ut-hour))))
(when ut-min
(setq tz (+ tz (* 60 (string-to-number ut-min)))))
(when (equal ut-char "-")
(setq tz (- tz))))
(encode-time
(if sec (string-to-number sec) 0)
(if min (string-to-number min) 0)
(if hour (string-to-number hour) 0)
(if day (string-to-number day) 1)
(if month (string-to-number month) 1)
(string-to-number year)
tz))))
(defmacro pdf-info-compose-queries (let-forms &rest body)
"Let-bind each VAR to QUERIES results and evaluate BODY.
All queries in each QUERIES form are run by the server in the
order they appear and the results collected in a list, which is
bound to VAR. Then BODY is evaluated and its value becomes the
final result of all queries, unless at least one of them provoked
an error. In this case BODY is ignored and the error is the
result.
This macro handles synchronous and asynchronous calls,
i.e. `pdf-info-asynchronous' is non-nil, transparently.
\(FN \(\(VAR QUERIES\)...\) BODY\)"
(declare (indent 1)
(debug ((&rest &or
(symbolp &optional form)
symbolp)
body)))
(unless (cl-every (lambda (form)
(when (symbolp form)
(setq form (list form)))
(and (consp form)
(symbolp (car form))
(listp (cdr form))))
let-forms)
(error "Invalid let-form: %s" let-forms))
(setq let-forms (mapcar (lambda (form)
(if (symbolp form)
(list form)
form))
let-forms))
(let* ((status (make-symbol "status"))
(response (make-symbol "response"))
(first-error (make-symbol "first-error"))
(done (make-symbol "done"))
(callback (make-symbol "callback"))
(results (make-symbol "results"))
(push-fn (make-symbol "push-fn"))
(terminal-fn (make-symbol "terminal-fn"))
(buffer (make-symbol "buffer")))
`(let* (,status
,response ,first-error ,done
(,buffer (current-buffer))
(,callback pdf-info-asynchronous)
;; Ensure a new alist on every invocation.
(,results (mapcar 'copy-sequence
',(cl-mapcar (lambda (form)
(list (car form)))
let-forms)))
(,push-fn (lambda (status result var)
;; Store result in alist RESULTS under key
;; VAR.
(if status
(unless ,first-error
(setq ,first-error result))
(let ((elt (assq var ,results)))
(setcdr elt (append (cdr elt)
(list result)))))))
(,terminal-fn
(lambda (&rest _)
;; Let-bind responses corresponding to their variables,
;; i.e. keys in alist RESULTS.
(let (,@(mapcar (lambda (var)
`(,var (cdr (assq ',var ,results))))
(mapcar #'car let-forms)))
(setq ,status (not (not ,first-error))
,response (or ,first-error
(with-current-buffer ,buffer
,@body))
,done t)
;; Maybe invoke the CALLBACK (which was bound to
;; pdf-info-asynchronous).
(when ,callback
(if (functionp ,callback)
(funcall ,callback ,status ,response)
(apply (car ,callback)
,status ,response (cdr ,callback))))))))
;; Wrap each query in an asynchronous call, with its VAR as
;; callback argument, so the PUSH-FN can put it in the alist
;; RESULTS.
,@(mapcar (lambda (form)
(list 'let (list
(list 'pdf-info-asynchronous
(list 'list push-fn (list 'quote (car form)))))
(cadr form)))
let-forms)
;; Request a no-op, just so we know that we are finished.
(let ((pdf-info-asynchronous ,terminal-fn))
(pdf-info-ping))
;; CALLBACK is the original value of pdf-info-asynchronous. If
;; nil, this is a synchronous query.
(unless ,callback
(while (and (not ,done)
(eq (process-status (pdf-info-process))
'run))
(accept-process-output (pdf-info-process) 0.01))
(when (and (not ,done)
(not (eq (process-status (pdf-info-process))
'run)))
(error "The epdfinfo server quit unexpectedly"))
(when ,status
(error "epdfinfo: %s" ,response))
,response))))
;; * ================================================================== *
;; * Buffer local server instances
;; * ================================================================== *
(put 'pdf-info--queue 'permanent-local t)
(defun pdf-info-make-local-server (&optional buffer force-restart-p)
"Create a server instance local to BUFFER.
Does nothing if BUFFER already has a local instance. Unless
FORCE-RESTART-P is non-nil, then quit a potential process and
restart it."
(unless buffer
(setq buffer (current-buffer)))
(with-current-buffer buffer
(unless (and
(not force-restart-p)
(local-variable-p 'pdf-info--queue)
(processp (pdf-info-process))
(eq (process-status (pdf-info-process))
'run))
(when (and (local-variable-p 'pdf-info--queue)
(processp (pdf-info-process)))
(tq-close pdf-info--queue))
(set (make-local-variable 'pdf-info--queue) nil)
(pdf-info-process-assert-running t)
(add-hook 'kill-buffer-hook #'pdf-info-kill-local-server nil t)
pdf-info--queue)))
(defun pdf-info-kill-local-server (&optional buffer)
"Kill the local server in BUFFER.
A No-op, if BUFFER has not running server instance."
(save-current-buffer
(when buffer
(set-buffer buffer))
(when (local-variable-p 'pdf-info--queue)
(pdf-info-kill)
(kill-local-variable 'pdf-info--queue)
t)))
(defun pdf-info-local-server-p (&optional buffer)
"Return non-nil, if BUFFER has a running server instance."
(unless buffer
(setq buffer (current-buffer)))
(setq buffer (get-buffer buffer))
(and (buffer-live-p buffer)
(local-variable-p 'pdf-info--queue buffer)))
(defun pdf-info-local-batch-query (producer-fn
consumer-fn
sentinel-fn
args)
"Process a set of queries asynchronously in a local instance."
(unless (pdf-info-local-server-p)
(error "Create a local server first"))
(let* ((buffer (current-buffer))
(producer-symbol (make-symbol "producer"))
(consumer-symbol (make-symbol "consumer"))
(producer
(lambda (args)
(if (null args)
(funcall sentinel-fn 'finished buffer)
(let ((pdf-info-asynchronous
(apply-partially
(symbol-function consumer-symbol)
args)))
(cond
((pdf-info-local-server-p buffer)
(with-current-buffer buffer
(apply producer-fn (car args))))
(t
(funcall sentinel-fn 'error buffer)))))))
(consumer (lambda (args status result)
(if (not (pdf-info-local-server-p buffer))
(funcall sentinel-fn 'error buffer)
(with-current-buffer buffer
(apply consumer-fn status result (car args)))
(funcall (symbol-function producer-symbol)
(cdr args))))))
(fset producer-symbol producer)
(fset consumer-symbol consumer)
(funcall producer args)))
;; * ================================================================== *
;; * High level interface
;; * ================================================================== *
(defvar pdf-info-features nil)
(defun pdf-info-features ()
"Return a list of symbols describing compile-time features."
(or pdf-info-features
(setq pdf-info-features
(let (pdf-info-asynchronous)
(pdf-info-query 'features)))))
(defun pdf-info-writable-annotations-p ()
(not (null (memq 'writable-annotations (pdf-info-features)))))
(defun pdf-info-markup-annotations-p ()
(not (null (memq 'markup-annotations (pdf-info-features)))))