;;; ox-texinfo.el --- Texinfo Back-End for Org Export Engine

;; Copyright (C) 2012-2015 Free Software Foundation, Inc.
;; Author: Jonathan Leech-Pepin <jonathan.leechpepin at gmail dot com>
;; Keywords: outlines, hypermedia, calendar, wp

;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:
;;
;; See Org manual for details.

;;; Code:

(eval-when-compile (require 'cl))
(require 'ox)

(defvar orgtbl-exp-regexp)


\f
;;; Define Back-End

(org-export-define-backend 'texinfo
  '((bold . org-texinfo-bold)
    (center-block . org-texinfo-center-block)
    (clock . org-texinfo-clock)
    (code . org-texinfo-code)
    (drawer . org-texinfo-drawer)
    (dynamic-block . org-texinfo-dynamic-block)
    (entity . org-texinfo-entity)
    (example-block . org-texinfo-example-block)
    (export-block . org-texinfo-export-block)
    (export-snippet . org-texinfo-export-snippet)
    (fixed-width . org-texinfo-fixed-width)
    (footnote-definition . org-texinfo-footnote-definition)
    (footnote-reference . org-texinfo-footnote-reference)
    (headline . org-texinfo-headline)
    (inline-src-block . org-texinfo-inline-src-block)
    (inlinetask . org-texinfo-inlinetask)
    (italic . org-texinfo-italic)
    (item . org-texinfo-item)
    (keyword . org-texinfo-keyword)
    (line-break . org-texinfo-line-break)
    (link . org-texinfo-link)
    (node-property . org-texinfo-node-property)
    (paragraph . org-texinfo-paragraph)
    (plain-list . org-texinfo-plain-list)
    (plain-text . org-texinfo-plain-text)
    (planning . org-texinfo-planning)
    (property-drawer . org-texinfo-property-drawer)
    (quote-block . org-texinfo-quote-block)
    (radio-target . org-texinfo-radio-target)
    (section . org-texinfo-section)
    (special-block . org-texinfo-special-block)
    (src-block . org-texinfo-src-block)
    (statistics-cookie . org-texinfo-statistics-cookie)
    (subscript . org-texinfo-subscript)
    (superscript . org-texinfo-superscript)
    (table . org-texinfo-table)
    (table-cell . org-texinfo-table-cell)
    (table-row . org-texinfo-table-row)
    (target . org-texinfo-target)
    (template . org-texinfo-template)
    (timestamp . org-texinfo-timestamp)
    (verbatim . org-texinfo-verbatim)
    (verse-block . org-texinfo-verse-block))
  :export-block "TEXINFO"
  :filters-alist
  '((:filter-headline . org-texinfo--filter-section-blank-lines)
    (:filter-parse-tree . org-texinfo--normalize-headlines)
    (:filter-section . org-texinfo--filter-section-blank-lines))
  :menu-entry
  '(?i "Export to Texinfo"
       ((?t "As TEXI file" org-texinfo-export-to-texinfo)
	(?i "As INFO file" org-texinfo-export-to-info)
	(?o "As INFO file and open"
	    (lambda (a s v b d)
	      (if a (org-texinfo-export-to-info t s v b d)
		(org-open-file (org-texinfo-export-to-info nil s v b d)))))))
  :options-alist
  '((:texinfo-filename "TEXINFO_FILENAME" nil nil t)
    (:texinfo-class "TEXINFO_CLASS" nil org-texinfo-default-class t)
    (:texinfo-header "TEXINFO_HEADER" nil nil newline)
    (:texinfo-post-header "TEXINFO_POST_HEADER" nil nil newline)
    (:subtitle "SUBTITLE" nil nil parse)
    (:subauthor "SUBAUTHOR" nil nil newline)
    (:texinfo-dircat "TEXINFO_DIR_CATEGORY" nil nil t)
    (:texinfo-dirtitle "TEXINFO_DIR_TITLE" nil nil t)
    (:texinfo-dirdesc "TEXINFO_DIR_DESC" nil nil t)
    (:texinfo-printed-title "TEXINFO_PRINTED_TITLE" nil nil t)
    ;; Other variables.
    (:texinfo-classes nil nil org-texinfo-classes)
    (:texinfo-format-headline-function nil nil org-texinfo-format-headline-function)
    (:texinfo-node-description-column nil nil org-texinfo-node-description-column)
    (:texinfo-active-timestamp-format nil nil org-texinfo-active-timestamp-format)
    (:texinfo-inactive-timestamp-format nil nil org-texinfo-inactive-timestamp-format)
    (:texinfo-diary-timestamp-format nil nil org-texinfo-diary-timestamp-format)
    (:texinfo-link-with-unknown-path-format nil nil org-texinfo-link-with-unknown-path-format)
    (:texinfo-tables-verbatim nil nil org-texinfo-tables-verbatim)
    (:texinfo-table-scientific-notation nil nil org-texinfo-table-scientific-notation)
    (:texinfo-def-table-markup nil nil org-texinfo-def-table-markup)
    (:texinfo-text-markup-alist nil nil org-texinfo-text-markup-alist)
    (:texinfo-format-drawer-function nil nil org-texinfo-format-drawer-function)
    (:texinfo-format-inlinetask-function nil nil org-texinfo-format-inlinetask-function)))


\f
;;; User Configurable Variables

(defgroup org-export-texinfo nil
  "Options for exporting Org mode files to Texinfo."
  :tag "Org Export Texinfo"
  :version "24.4"
  :package-version '(Org . "8.0")
  :group 'org-export)

;;;; Preamble

(defcustom org-texinfo-coding-system nil
  "Default document encoding for Texinfo output.

If nil it will default to `buffer-file-coding-system'."
  :group 'org-export-texinfo
  :type 'coding-system)

(defcustom org-texinfo-default-class "info"
  "The default Texinfo class."
  :group 'org-export-texinfo
  :type '(string :tag "Texinfo class"))

(defcustom org-texinfo-classes
  '(("info"
     "@documentencoding AUTO\n@documentlanguage AUTO"
     ("@chapter %s" . "@unnumbered %s")
     ("@section %s" . "@unnumberedsec %s")
     ("@subsection %s" . "@unnumberedsubsec %s")
     ("@subsubsection %s" . "@unnumberedsubsubsec %s")))
  "Alist of Texinfo classes and associated header and structure.
If #+TEXINFO_CLASS is set in the buffer, use its value and the
associated information.  Here is the structure of each cell:

  (class-name
    header-string
    (numbered-section . unnumbered-section)
    ...)


The header string
-----------------

The header string is inserted in the header of the generated
document, right after \"@setfilename\" and \"@settitle\"
commands.

If it contains the special string

  \"@documentencoding AUTO\"

\"AUTO\" will be replaced with an appropriate coding system.  See
`org-texinfo-coding-system' for more information.  Likewise, if
the string contains the special string

  \"@documentlanguage AUTO\"

\"AUTO\" will be replaced with the language defined in the
buffer, through #+LANGUAGE keyword, or globally, with
`org-export-default-language', which see.


The sectioning structure
------------------------

The sectioning structure of the class is given by the elements
following the header string.  For each sectioning level, a number
of strings is specified.  A %s formatter is mandatory in each
section string and will be replaced by the title of the section.

Instead of a list of sectioning commands, you can also specify
a function name.  That function will be called with two
parameters, the reduced) level of the headline, and a predicate
non-nil when the headline should be numbered.  It must return
a format string in which the section title will be added."
  :group 'org-export-texinfo
  :version "24.4"
  :package-version '(Org . "8.2")
  :type '(repeat
	  (list (string :tag "Texinfo class")
		(string :tag "Texinfo header")
		(repeat :tag "Levels" :inline t
			(choice
			 (cons :tag "Heading"
			       (string :tag "  numbered")
			       (string :tag "unnumbered"))
			 (function :tag "Hook computing sectioning"))))))

;;;; Headline

(defcustom org-texinfo-format-headline-function
  'org-texinfo-format-headline-default-function
  "Function to format headline text.

This function will be called with 5 arguments:
TODO      the todo keyword (string or nil).
TODO-TYPE the type of todo (symbol: `todo', `done', nil)
PRIORITY  the priority of the headline (integer or nil)
TEXT      the main headline text (string).
TAGS      the tags as a list of strings (list of strings or nil).

The function result will be used in the section format string."
  :group 'org-export-texinfo
  :type 'function
  :version "25.1"
  :package-version '(Org . "8.3"))

;;;; Node listing (menu)

(defcustom org-texinfo-node-description-column 32
  "Column at which to start the description in the node listings.
If a node title is greater than this length, the description will
be placed after the end of the title."
  :group 'org-export-texinfo
  :type 'integer)

;;;; Timestamps

(defcustom org-texinfo-active-timestamp-format "@emph{%s}"
  "A printf format string to be applied to active timestamps."
  :group 'org-export-texinfo
  :type 'string)

(defcustom org-texinfo-inactive-timestamp-format "@emph{%s}"
  "A printf format string to be applied to inactive timestamps."
  :group 'org-export-texinfo
  :type 'string)

(defcustom org-texinfo-diary-timestamp-format "@emph{%s}"
  "A printf format string to be applied to diary timestamps."
  :group 'org-export-texinfo
  :type 'string)

;;;; Links

(defcustom org-texinfo-link-with-unknown-path-format "@indicateurl{%s}"
  "Format string for links with unknown path type."
  :group 'org-export-texinfo
  :type 'string)

;;;; Tables

(defcustom org-texinfo-tables-verbatim nil
  "When non-nil, tables are exported verbatim."
  :group 'org-export-texinfo
  :type 'boolean)

(defcustom org-texinfo-table-scientific-notation "%s\\,(%s)"
  "Format string to display numbers in scientific notation.
The format should have \"%s\" twice, for mantissa and exponent
\(i.e. \"%s\\\\times10^{%s}\").

When nil, no transformation is made."
  :group 'org-export-texinfo
  :type '(choice
	  (string :tag "Format string")
	  (const :tag "No formatting" nil)))

(defcustom org-texinfo-def-table-markup "@samp"
  "Default setting for @table environments."
  :group 'org-export-texinfo
  :type 'string)

;;;; Text markup

(defcustom org-texinfo-text-markup-alist '((bold . "@strong{%s}")
					   (code . code)
					   (italic . "@emph{%s}")
					   (verbatim . verb)
					   (comment . "@c %s"))
  "Alist of Texinfo expressions to convert text markup.

The key must be a symbol among `bold', `italic' and `comment'.
The value is a formatting string to wrap fontified text with.

Value can also be set to the following symbols: `verb' and
`code'.  For the former, Org will use \"@verb\" to
create a format string and select a delimiter character that
isn't in the string.  For the latter, Org will use \"@code\"
to typeset and try to protect special characters.

If no association can be found for a given markup, text will be
returned as-is."
  :group 'org-export-texinfo
  :type 'alist
  :options '(bold code italic verbatim comment))

;;;; Drawers

(defcustom org-texinfo-format-drawer-function
  (lambda (name contents) contents)
  "Function called to format a drawer in Texinfo code.

The function must accept two parameters:
  NAME      the drawer name, like \"LOGBOOK\"
  CONTENTS  the contents of the drawer.

The function should return the string to be exported.

The default function simply returns the value of CONTENTS."
  :group 'org-export-texinfo
  :version "24.4"
  :package-version '(Org . "8.2")
  :type 'function)

;;;; Inlinetasks

(defcustom org-texinfo-format-inlinetask-function
  'org-texinfo-format-inlinetask-default-function
  "Function called to format an inlinetask in Texinfo code.

The function must accept six parameters:
  TODO      the todo keyword, as a string
  TODO-TYPE the todo type, a symbol among `todo', `done' and nil.
  PRIORITY  the inlinetask priority, as a string
  NAME      the inlinetask name, as a string.
  TAGS      the inlinetask tags, as a list of strings.
  CONTENTS  the contents of the inlinetask, as a string.

The function should return the string to be exported."
  :group 'org-export-texinfo
  :type 'function)

;;;; Compilation

(defcustom org-texinfo-info-process '("makeinfo %f")
  "Commands to process a Texinfo file to an INFO file.
This is list of strings, each of them will be given to the shell
as a command.  %f in the command will be replaced by the full
file name, %b by the file base name (i.e without extension) and
%o by the base directory of the file."
  :group 'org-export-texinfo
  :type '(repeat :tag "Shell command sequence"
		 (string :tag "Shell command")))

(defcustom org-texinfo-logfiles-extensions
  '("aux" "toc" "cp" "fn" "ky" "pg" "tp" "vr")
  "The list of file extensions to consider as Texinfo logfiles.
The logfiles will be remove if `org-texinfo-remove-logfiles' is
non-nil."
  :group 'org-export-texinfo
  :type '(repeat (string :tag "Extension")))

(defcustom org-texinfo-remove-logfiles t
  "Non-nil means remove the logfiles produced by compiling a Texinfo file.
By default, logfiles are files with these extensions: .aux, .toc,
.cp, .fn, .ky, .pg and .tp.  To define the set of logfiles to remove,
set `org-texinfo-logfiles-extensions'."
  :group 'org-export-latex
  :type 'boolean)

;;; Constants

(defconst org-texinfo-max-toc-depth 4
  "Maximum depth for creation of detailed menu listings.
Beyond this depth, Texinfo will not recognize the nodes and will
cause errors.  Left as a constant in case this value ever
changes.")

(defconst org-texinfo-supported-coding-systems
  '("US-ASCII" "UTF-8" "ISO-8859-15" "ISO-8859-1" "ISO-8859-2" "koi8-r" "koi8-u")
  "List of coding systems supported by Texinfo, as strings.
Specified coding system will be matched against these strings.
If two strings share the same prefix (e.g. \"ISO-8859-1\" and
\"ISO-8859-15\"), the most specific one has to be listed first.")

(defconst org-texinfo-inline-image-rules
  (list (cons "file"
	      (regexp-opt '("eps" "pdf" "png" "jpg" "jpeg" "gif" "svg"))))
  "Rules characterizing image files that can be inlined.")

\f
;;; Internal Functions

(defun org-texinfo--filter-section-blank-lines (headline back-end info)
  "Filter controlling number of blank lines after a section."
  (let ((blanks (make-string 2 ?\n)))
    (replace-regexp-in-string "\n\\(?:\n[ \t]*\\)*\\'" blanks headline)))

(defun org-texinfo--normalize-headlines (tree back-end info)
  "Normalize headlines in TREE.

BACK-END is the symbol specifying back-end used for export. INFO
is a plist used as a communication channel.

Make sure every headline in TREE contains a section, since those
are required to install a menu.  Also put exactly one blank line
at the end of each section.

Return new tree."
  (org-element-map tree 'headline
    (lambda (hl)
      (org-element-put-property hl :post-blank 1)
      (let ((contents (org-element-contents hl)))
	(when contents
	  (let ((first (org-element-map contents '(headline section)
			 #'identity info t)))
	    (unless (eq (org-element-type first) 'section)
	      (apply #'org-element-set-contents
		     hl
		     (cons `(section (:parent ,hl)) contents)))))))
    info)
  tree)

(defun org-texinfo--find-verb-separator (s)
  "Return a character not used in string S.
This is used to choose a separator for constructs like \\verb."
  (let ((ll "~,./?;':\"|!@#%^&-_=+abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ<>()[]{}"))
    (loop for c across ll
	  when (not (string-match (regexp-quote (char-to-string c)) s))
	  return (char-to-string c))))

(defun org-texinfo--text-markup (text markup info)
  "Format TEXT depending on MARKUP text markup.
INFO is a plist used as a communication channel.  See
`org-texinfo-text-markup-alist' for details."
  (let ((fmt (cdr (assq markup org-texinfo-text-markup-alist))))
    (cond
     ;; No format string: Return raw text.
     ((not fmt) text)
     ((eq 'verb fmt)
      (let ((separator (org-texinfo--find-verb-separator text)))
	(concat "@verb{" separator text separator "}")))
     ((eq 'code fmt)
      (let ((start 0)
	    (rtn "")
	    char)
	(while (string-match "[@{}]" text)
	  (setq char (match-string 0 text))
	  (if (> (match-beginning 0) 0)
	      (setq rtn (concat rtn (substring text 0 (match-beginning 0)))))
	  (setq text (substring text (1+ (match-beginning 0))))
	  (setq char (concat "@" char)
		rtn (concat rtn char)))
	(setq text (concat rtn text)
	      fmt "@code{%s}")
	(format fmt text)))
     ;; Else use format string.
     (t (format fmt text)))))

(defun org-texinfo--get-node (blob info)
  "Return node or anchor associated to BLOB.
BLOB is an element or object.  INFO is a plist used as
a communication channel.  The function guarantees the node or
anchor name is unique."
  (let ((cache (plist-get info :texinfo-node-cache)))
    (or (cdr (assq blob cache))
	(let ((name
	       (org-texinfo--sanitize-node
		(if (eq (org-element-type blob) 'headline)
		    (org-export-data (org-export-get-alt-title blob info) info)
		  (org-export-get-reference blob info)))))
	  ;; Ensure NAME is unique.
	  (while (rassoc name cache) (setq name (concat name "x")))
	  (plist-put info :texinfo-node-cache (cons (cons blob name) cache))
	  name))))

(defun org-texinfo--sanitize-node (title)
  "Bend string TITLE to node line requirements.
Trim string and collapse multiple whitespace characters as they
are not significant.  Also remove the following characters: @
{ } ( ) : . ,"
  (replace-regexp-in-string
   "[:,.]" ""
   (replace-regexp-in-string
    "\\`(\\(.*)\\)" "[\\1"
    (org-trim (replace-regexp-in-string "[ \t]\\{2,\\}" " " title)))))

(defun org-texinfo--sanitize-content (text)
  "Escape special characters in string TEXT.
Special characters are: @ { }"
  (replace-regexp-in-string "[@{}]" "@\\&" text))

(defun org-texinfo--wrap-float (value info &optional type label caption short)
  "Wrap string VALUE within a @float command.
INFO is the current export state, as a plist.  TYPE is float
type, as a string.  LABEL is the cross reference label for the
float, as a string.  CAPTION and SHORT are, respectively, the
caption and shortcaption used for the float, as secondary
strings (e.g., returned by `org-export-get-caption')."
  (let* ((backend
	  (org-export-create-backend
	   :parent 'texinfo
	   :transcoders '((link . (lambda (object c i) c))
			  (radio-target . (lambda (object c i) c))
			  (target . ignore))))
	 (short-backend
	  (org-export-create-backend
	   :parent 'texinfo
	   :transcoders '((footnote-reference . ignore)
			  (inline-src-block . ignore)
			  (link . (lambda (object c i) c))
			  (radio-target . (lambda (object c i) c))
			  (target . ignore)
			  (verbatim . ignore))))
	 (short-str
	  (if (and short caption)
	      (format "@shortcaption{%s}\n"
		      (org-export-data-with-backend short short-backend info))
	    ""))
	 (caption-str
	  (if (or short caption)
	      (format "@caption{%s}\n"
		      (org-export-data-with-backend
		       (or caption short)
		       (if (equal short-str "") short-backend backend)
		       info))
	    "")))
    (format "@float %s%s\n%s\n%s%s@end float"
	    type (if label (concat "," label) "") value caption-str short-str)))

;;; Template

(defun org-texinfo-template (contents info)
  "Return complete document string after Texinfo conversion.
CONTENTS is the transcoded contents string.  INFO is a plist
holding export options."
  (let ((title (org-export-data (plist-get info :title) info))
	;; Copying data is the contents of the first headline in
	;; parse tree with a non-nil copying property.
	(copying (org-element-map (plist-get info :parse-tree) 'headline
		   (lambda (hl)
		     (and (org-not-nil (org-element-property :COPYING hl))
			  (org-element-contents hl)))
		   info t)))
    (concat
     "\\input texinfo    @c -*- texinfo -*-\n"
     "@c %**start of header\n"
     (let ((file (or (plist-get info :texinfo-filename)
		     (let ((f (plist-get info :output-file)))
		       (and f (concat (file-name-sans-extension f) ".info"))))))
       (and file (format "@setfilename %s\n" file)))
     (format "@settitle %s\n" title)
     ;; Insert class-defined header.
     (org-element-normalize-string
      (let ((header (nth 1 (assoc (plist-get info :texinfo-class)
				  org-texinfo-classes)))
	    (coding
	     (catch 'coding-system
	       (let ((case-fold-search t)
		     (name (symbol-name (or org-texinfo-coding-system
					    buffer-file-coding-system))))
		 (dolist (system org-texinfo-supported-coding-systems "UTF-8")
		   (when (org-string-match-p (regexp-quote system) name)
		     (throw 'coding-system system))))))
	    (language (plist-get info :language))
	    (case-fold-search nil))
	;; Auto coding system.
	(replace-regexp-in-string
	 "^@documentencoding \\(AUTO\\)$"
	 coding
	 (replace-regexp-in-string
	  "^@documentlanguage \\(AUTO\\)$" language header t nil 1) t nil 1)))
     ;; Additional header options set by #+TEXINFO_HEADER.
     (let ((texinfo-header (plist-get info :texinfo-header)))
       (and texinfo-header (org-element-normalize-string texinfo-header)))
     "@c %**end of header\n\n"
     ;; Additional options set by #+TEXINFO_POST_HEADER.
     (let ((texinfo-post-header (plist-get info :texinfo-post-header)))
       (and texinfo-post-header
	    (org-element-normalize-string texinfo-post-header)))
     ;; Copying.
     (and copying
	  (format "@copying\n%s@end copying\n\n"
		  (org-element-normalize-string
		   (org-export-data copying info))))
     ;; Info directory information.  Only supply if both title and
     ;; category are provided.
     (let ((dircat (plist-get info :texinfo-dircat))
	   (dirtitle
	    (let ((title (plist-get info :texinfo-dirtitle)))
	      (and title
		   (string-match "^\\(?:\\* \\)?\\(.*?\\)\\(\\.\\)?$" title)
		   (format "* %s." (match-string 1 title))))))
       (when (and dircat dirtitle)
	 (concat "@dircategory " dircat "\n"
		 "@direntry\n"
		 (let ((dirdesc
			(let ((desc (plist-get info :texinfo-dirdesc)))
			  (cond ((not desc) nil)
				((org-string-match-p "\\.$" desc) desc)
				(t (concat desc "."))))))
		   (if dirdesc (format "%-23s %s" dirtitle dirdesc) dirtitle))
		 "\n"
		 "@end direntry\n\n")))
     ;; Title
     "@finalout\n"
     "@titlepage\n"
     (when (plist-get info :with-title)
       (concat
	(format "@title %s\n" (or (plist-get info :texinfo-printed-title) title ""))
	(let ((subtitle (plist-get info :subtitle)))
	  (when subtitle
	    (format "@subtitle %s\n"
		    (org-export-data subtitle info))))))
     (when (plist-get info :with-author)
       (concat
	;; Primary author.
	(let ((author (org-string-nw-p
		       (org-export-data (plist-get info :author) info)))
	      (email (and (plist-get info :with-email)
			  (org-string-nw-p
			   (org-export-data (plist-get info :email) info)))))
	  (cond ((and author email)
		 (format "@author %s (@email{%s})\n" author email))
		(author (format "@author %s\n" author))
		(email (format "@author @email{%s}\n" email))))
	;; Other authors.
	(let ((subauthor (plist-get info :subauthor)))
	  (and subauthor
	       (org-element-normalize-string
		(replace-regexp-in-string "^" "@author " subauthor))))))
     (and copying "@page\n@vskip 0pt plus 1filll\n@insertcopying\n")
     "@end titlepage\n\n"
     ;; Table of contents.
     (and (plist-get info :with-toc) "@contents\n\n")
     ;; Configure Top Node when not for Tex
     "@ifnottex\n"
     "@node Top\n"
     (format "@top %s\n" title)
     (and copying "@insertcopying\n")
     "@end ifnottex\n\n"
     ;; Menu.
     (org-texinfo-make-menu (plist-get info :parse-tree) info 'master)
     "\n"
     ;; Document's body.
     contents "\n"
     ;; Creator.
     (and (plist-get info :with-creator)
	  (concat (plist-get info :creator) "\n"))
     ;; Document end.
     "@bye")))


\f
;;; Transcode Functions

;;;; Bold

(defun org-texinfo-bold (bold contents info)
  "Transcode BOLD from Org to Texinfo.
CONTENTS is the text with bold markup.  INFO is a plist holding
contextual information."
  (org-texinfo--text-markup contents 'bold info))

;;;; Center Block

(defun org-texinfo-center-block (center-block contents info)
  "Transcode a CENTER-BLOCK element from Org to Texinfo.
CONTENTS holds the contents of the block.  INFO is a plist used
as a communication channel."
  contents)

;;;; Clock

(defun org-texinfo-clock (clock contents info)
  "Transcode a CLOCK element from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual
information."
  (concat
   "@noindent"
   (format "@strong{%s} " org-clock-string)
   (format (plist-get info :texinfo-inactive-timestamp-format)
	   (concat (org-timestamp-translate (org-element-property :value clock))
		   (let ((time (org-element-property :duration clock)))
		     (and time (format " (%s)" time)))))
   "@*"))

;;;; Code

(defun org-texinfo-code (code contents info)
  "Transcode a CODE object from Org to Texinfo.
CONTENTS is nil.  INFO is a plist used as a communication
channel."
  (org-texinfo--text-markup (org-element-property :value code) 'code info))

;;;; Drawer

(defun org-texinfo-drawer (drawer contents info)
  "Transcode a DRAWER element from Org to Texinfo.
CONTENTS holds the contents of the block.  INFO is a plist
holding contextual information."
  (let* ((name (org-element-property :drawer-name drawer))
	 (output (funcall (plist-get info :texinfo-format-drawer-function)
			  name contents)))
    output))

;;;; Dynamic Block

(defun org-texinfo-dynamic-block (dynamic-block contents info)
  "Transcode a DYNAMIC-BLOCK element from Org to Texinfo.
CONTENTS holds the contents of the block.  INFO is a plist
holding contextual information."
  contents)

;;;; Entity

(defun org-texinfo-entity (entity contents info)
  "Transcode an ENTITY object from Org to Texinfo.
CONTENTS are the definition itself.  INFO is a plist holding
contextual information."
  (let ((ent (org-element-property :latex entity)))
    (if (org-element-property :latex-math-p entity) (format "@math{%s}" ent) ent)))

;;;; Example Block

(defun org-texinfo-example-block (example-block contents info)
  "Transcode an EXAMPLE-BLOCK element from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual
information."
  (format "@verbatim\n%s@end verbatim"
	  (org-export-format-code-default example-block info)))

;;; Export Block

(defun org-texinfo-export-block (export-block contents info)
  "Transcode a EXPORT-BLOCK element from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual information."
  (when (string= (org-element-property :type export-block) "TEXINFO")
    (org-remove-indentation (org-element-property :value export-block))))

;;; Export Snippet

(defun org-texinfo-export-snippet (export-snippet contents info)
  "Transcode a EXPORT-SNIPPET object from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual information."
  (when (eq (org-export-snippet-backend export-snippet) 'texinfo)
    (org-element-property :value export-snippet)))

;;;; Fixed Width

(defun org-texinfo-fixed-width (fixed-width contents info)
  "Transcode a FIXED-WIDTH element from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual information."
  (format "@example\n%s\n@end example"
	  (org-remove-indentation
	   (org-texinfo--sanitize-content
	    (org-element-property :value fixed-width)))))

;;;; Footnote Reference

(defun org-texinfo-footnote-reference (footnote contents info)
  "Create a footnote reference for FOOTNOTE.

FOOTNOTE is the footnote to define.  CONTENTS is nil.  INFO is a
plist holding contextual information."
  (let ((def (org-export-get-footnote-definition footnote info)))
    (format "@footnote{%s}"
	    (org-trim (org-export-data def info)))))

;;;; Headline

(defun org-texinfo-headline (headline contents info)
  "Transcode a HEADLINE element from Org to Texinfo.
CONTENTS holds the contents of the headline.  INFO is a plist
holding contextual information."
  (let* ((class (plist-get info :texinfo-class))
	 (level (org-export-get-relative-level headline info))
	 (numberedp (org-export-numbered-headline-p headline info))
	 (class-sectioning (assoc class (plist-get info :texinfo-classes)))
	 ;; Find the index type, if any.
	 (index (org-element-property :INDEX headline))
	 ;; Create node info, to insert it before section formatting.
	 ;; Use custom menu title if present.
	 (node (format "@node %s\n" (org-texinfo--get-node headline info)))
	 ;; Section formatting will set two placeholders: one for the
	 ;; title and the other for the contents.
	 (section-fmt
	  (if (org-not-nil (org-element-property :APPENDIX headline))
	      "@appendix %s\n%s"
	    (let ((sec (if (and (symbolp (nth 2 class-sectioning))
				(fboundp (nth 2 class-sectioning)))
			   (funcall (nth 2 class-sectioning) level numberedp)
			 (nth (1+ level) class-sectioning))))
	      (cond
	       ;; No section available for that LEVEL.
	       ((not sec) nil)
	       ;; Section format directly returned by a function.
	       ((stringp sec) sec)
	       ;; (numbered-section . unnumbered-section)
	       ((not (consp (cdr sec)))
		(concat (if (or index (not numberedp)) (cdr sec) (car sec))
			"\n%s"))))))
	 (todo
	  (and (plist-get info :with-todo-keywords)
	       (let ((todo (org-element-property :todo-keyword headline)))
		 (and todo (org-export-data todo info)))))
	 (todo-type (and todo (org-element-property :todo-type headline)))
	 (tags (and (plist-get info :with-tags)
		    (org-export-get-tags headline info)))
	 (priority (and (plist-get info :with-priority)
			(org-element-property :priority headline)))
	 (text (org-export-data (org-element-property :title headline) info))
	 (full-text (funcall (plist-get info :texinfo-format-headline-function)
			     todo todo-type priority text tags))
	 (contents (if (org-string-nw-p contents) (concat "\n" contents) "")))
    (cond
     ;; Case 1: This is a footnote section: ignore it.
     ((org-element-property :footnote-section-p headline) nil)
     ;; Case 2: This is the `copying' section: ignore it
     ;;         This is used elsewhere.
     ((org-not-nil (org-element-property :COPYING headline)) nil)
     ;; Case 3: An index.  If it matches one of the known indexes,
     ;;         print it as such following the contents, otherwise
     ;;         print the contents and leave the index up to the user.
     (index
      (concat node
	      (format
	       section-fmt
	       full-text
	       (concat contents
		       (and (member index '("cp" "fn" "ky" "pg" "tp" "vr"))
			    (concat "\n@printindex " index))))))
     ;; Case 4: This is a deep sub-tree: export it as a list item.
     ;;         Also export as items headlines for which no section
     ;;         format has been found.
     ((or (not section-fmt) (org-export-low-level-p headline info))
      ;; Build the real contents of the sub-tree.
      (concat (and (org-export-first-sibling-p headline info)
		   (format "@%s\n" (if numberedp 'enumerate 'itemize)))
	      "@item\n" full-text "\n"
	      contents
	      (if (org-export-last-sibling-p headline info)
		  (format "@end %s" (if numberedp 'enumerate 'itemize))
		"\n")))
     ;; Case 5: Standard headline.  Export it as a section.
     (t (concat node (format section-fmt full-text contents))))))

(defun org-texinfo-format-headline-default-function
  (todo todo-type priority text tags)
  "Default format function for a headline.
See `org-texinfo-format-headline-function' for details."
  (concat (when todo (format "@strong{%s} " todo))
	  (when priority (format "@emph{#%s} " priority))
	  text
	  (when tags (format " :%s:" (mapconcat 'identity tags ":")))))

;;;; Inline Src Block

(defun org-texinfo-inline-src-block (inline-src-block contents info)
  "Transcode an INLINE-SRC-BLOCK element from Org to Texinfo.
CONTENTS holds the contents of the item.  INFO is a plist holding
contextual information."
  (let* ((code (org-element-property :value inline-src-block))
	 (separator (org-texinfo--find-verb-separator code)))
    (concat "@verb{" separator code separator "}")))

;;;; Inlinetask

(defun org-texinfo-inlinetask (inlinetask contents info)
  "Transcode an INLINETASK element from Org to Texinfo.
CONTENTS holds the contents of the block.  INFO is a plist
holding contextual information."
  (let ((title (org-export-data (org-element-property :title inlinetask) info))
	(todo (and (plist-get info :with-todo-keywords)
		   (let ((todo (org-element-property :todo-keyword inlinetask)))
		     (and todo (org-export-data todo info)))))
	(todo-type (org-element-property :todo-type inlinetask))
	(tags (and (plist-get info :with-tags)
		   (org-export-get-tags inlinetask info)))
	(priority (and (plist-get info :with-priority)
		       (org-element-property :priority inlinetask))))
    (funcall (plist-get info :texinfo-format-inlinetask-function)
	     todo todo-type priority title tags contents)))

(defun org-texinfo-format-inlinetask-default-function
  (todo todo-type priority title tags contents)
  "Default format function for a inlinetasks.
See `org-texinfo-format-inlinetask-function' for details."
  (let ((full-title
	 (concat (when todo (format "@strong{%s} " todo))
		 (when priority (format "#%c " priority))
		 title
		 (when tags (format ":%s:" (mapconcat #'identity tags ":"))))))
    (format "@center %s\n\n%s\n" full-title contents)))

;;;; Italic

(defun org-texinfo-italic (italic contents info)
  "Transcode ITALIC from Org to Texinfo.
CONTENTS is the text with italic markup.  INFO is a plist holding
contextual information."
  (org-texinfo--text-markup contents 'italic info))

;;;; Item

(defun org-texinfo-item (item contents info)
  "Transcode an ITEM element from Org to Texinfo.
CONTENTS holds the contents of the item.  INFO is a plist holding
contextual information."
  (format "@item%s\n%s"
	  (let ((tag (org-element-property :tag item)))
	    (if tag (concat " " (org-export-data tag info)) ""))
	  (or contents "")))

;;;; Keyword

(defun org-texinfo-keyword (keyword contents info)
  "Transcode a KEYWORD element from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual information."
  (let ((key (org-element-property :key keyword))
	(value (org-element-property :value keyword)))
    (cond
     ((string= key "TEXINFO") value)
     ((string= key "CINDEX") (format "@cindex %s" value))
     ((string= key "FINDEX") (format "@findex %s" value))
     ((string= key "KINDEX") (format "@kindex %s" value))
     ((string= key "PINDEX") (format "@pindex %s" value))
     ((string= key "TINDEX") (format "@tindex %s" value))
     ((string= key "VINDEX") (format "@vindex %s" value))
     ((string= key "TOC")
      (cond ((org-string-match-p "\\<tables\\>" value)
	     (concat "@listoffloats "
		     (org-export-translate "Table" :utf-8 info)))
	    ((org-string-match-p "\\<listings\\>" value)
	     (concat "@listoffloats "
		     (org-export-translate "Listing" :utf-8 info))))))))

;;;; Line Break

(defun org-texinfo-line-break (line-break contents info)
  "Transcode a LINE-BREAK object from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual information."
  "@*\n")

;;;; Link

(defun org-texinfo-link (link desc info)
  "Transcode a LINK object from Org to Texinfo.

DESC is the description part of the link, or the empty string.
INFO is a plist holding contextual information.  See
`org-export-data'."
  (let* ((type (org-element-property :type link))
	 (raw-path (org-element-property :path link))
	 ;; Ensure DESC really exists, or set it to nil.
	 (desc (and (not (string= desc "")) desc))
	 (path (cond
		((member type '("http" "https" "ftp"))
		 (concat type ":" raw-path))
		((string= type "file") (org-export-file-uri raw-path))
		(t raw-path))))
    (cond
     ((org-export-custom-protocol-maybe link desc 'texinfo))
     ((org-export-inline-image-p link org-texinfo-inline-image-rules)
      (org-texinfo--inline-image link info))
     ((equal type "radio")
      (let ((destination (org-export-resolve-radio-link link info)))
	(if (not destination) desc
	  (format "@ref{%s,,%s}"
		  (org-texinfo--get-node destination info)
		  desc))))
     ((member type '("custom-id" "id" "fuzzy"))
      (let ((destination
	     (if (equal type "fuzzy")
		 (org-export-resolve-fuzzy-link link info)
	       (org-export-resolve-id-link link info))))
	(case (org-element-type destination)
	  ((nil)
	   (format org-texinfo-link-with-unknown-path-format
		   (org-texinfo--sanitize-content path)))
	  ;; Id link points to an external file.
	  (plain-text
	   (if desc (format "@uref{file://%s,%s}" destination desc)
	     (format "@uref{file://%s}" destination)))
	  (headline
	   (format "@ref{%s,%s}"
		   (org-texinfo--get-node destination info)
		   (cond
		    (desc)
		    ((org-export-numbered-headline-p destination info)
		     (mapconcat
		      #'number-to-string
		      (org-export-get-headline-number destination info) "."))
		    (t (org-export-data
			(org-element-property :title destination) info)))))
	  (otherwise
	   (format "@ref{%s,,%s}"
		   (org-texinfo--get-node destination info)
		   (cond
		    (desc)
		    ;; No description is provided: first try to
		    ;; associate destination to a number.
		    ((let ((n (org-export-get-ordinal destination info)))
		       (cond ((not n) nil)
			     ((integerp n) n)
			     (t (mapconcat #'number-to-string n ".")))))
		    ;; Then grab title of headline containing
		    ;; DESTINATION.
		    ((let ((h (org-element-lineage destination '(headline) t)))
		       (and h
			    (org-export-data
			     (org-element-property :title destination) info))))
		    ;; Eventually, just return "Top" to refer to the
		    ;; beginning of the info file.
		    (t "Top")))))))
     ((equal type "info")
      (let* ((info-path (split-string path "[:#]"))
	     (info-manual (car info-path))
	     (info-node (or (cadr info-path) "Top"))
	     (title (or desc "")))
	(format "@ref{%s,%s,,%s,}" info-node title info-manual)))
     ((string= type "mailto")
      (format "@email{%s}"
	      (concat (org-texinfo--sanitize-content path)
		      (and desc (concat "," desc)))))
     ;; External link with a description part.
     ((and path desc) (format "@uref{%s,%s}" path desc))
     ;; External link without a description part.
     (path (format "@uref{%s}" path))
     ;; No path, only description.  Try to do something useful.
     (t
      (format (plist-get info :texinfo-link-with-unknown-path-format) desc)))))

(defun org-texinfo--inline-image (link info)
  "Return Texinfo code for an inline image.
LINK is the link pointing to the inline image.  INFO is the
current state of the export, as a plist."
  (let* ((parent (org-export-get-parent-element link))
	 (label (and (org-element-property :name parent)
		     (org-texinfo--get-node parent info)))
	 (caption (org-export-get-caption parent))
	 (shortcaption (org-export-get-caption parent t))
	 (path  (org-element-property :path link))
	 (filename
	  (file-name-sans-extension
	   (if (file-name-absolute-p path) (expand-file-name path) path)))
	 (extension (file-name-extension path))
	 (attributes (org-export-read-attribute :attr_texinfo parent))
	 (height (or (plist-get attributes :height) ""))
	 (width (or (plist-get attributes :width) ""))
	 (alt (or (plist-get attributes :alt) ""))
	 (image (format "@image{%s,%s,%s,%s,%s}"
			filename width height alt extension)))
    (cond ((or caption shortcaption)
	   (org-texinfo--wrap-float image
				    info
				    (org-export-translate "Figure" :utf-8 info)
				    label
				    caption
				    shortcaption))
	  (label (concat "@anchor{" label "}\n" image))
	  (t image))))


;;;; Menu

(defun org-texinfo-make-menu (scope info &optional master)
  "Create the menu for inclusion in the Texinfo document.

SCOPE is a headline or a full parse tree.  INFO is the
communication channel, as a plist.

When optional argument MASTER is non-nil, generate a master menu,
including detailed node listing."
  (let ((menu (org-texinfo--build-menu scope info)))
    (when (org-string-nw-p menu)
      (org-element-normalize-string
       (format
	"@menu\n%s@end menu"
	(concat menu
		(when master
		  (let ((detailmenu
			 (org-texinfo--build-menu
			  scope info
			  (let ((toc-depth (plist-get info :with-toc)))
			    (if (wholenump toc-depth) toc-depth
			      org-texinfo-max-toc-depth)))))
		    (when (org-string-nw-p detailmenu)
		      (concat "\n@detailmenu\n"
			      "--- The Detailed Node Listing ---\n\n"
			      detailmenu
			      "@end detailmenu\n"))))))))))

(defun org-texinfo--build-menu (scope info &optional level)
  "Build menu for entries within SCOPE.
SCOPE is a headline or a full parse tree.  INFO is a plist
containing contextual information.  When optional argument LEVEL
is an integer, build the menu recursively, down to this depth."
  (cond
   ((not level)
    (org-texinfo--format-entries (org-texinfo--menu-entries scope info) info))
   ((zerop level) nil)
   (t
    (org-element-normalize-string
     (mapconcat
      (lambda (h)
	(let ((entries (org-texinfo--menu-entries h info)))
	  (when entries
	    (concat
	     (format "%s\n\n%s\n"
		     (org-export-data (org-export-get-alt-title h info) info)
		     (org-texinfo--format-entries entries info))
	     (org-texinfo--build-menu h info (1- level))))))
      (org-texinfo--menu-entries scope info) "")))))

(defun org-texinfo--format-entries (entries info)
  "Format all direct menu entries in SCOPE, as a string.
SCOPE is either a headline or a full Org document.  INFO is
a plist containing contextual information."
  (org-element-normalize-string
   (mapconcat
    (lambda (h)
      (let* ((title (org-export-data
		     (org-export-get-alt-title h info) info))
	     (node (org-texinfo--get-node h info))
	     (entry (concat "* " title ":"
			    (if (string= title node) ":"
			      (concat " " node ". "))))
	     (desc (org-element-property :DESCRIPTION h)))
	(if (not desc) entry
	  (format (format "%%-%ds %%s" org-texinfo-node-description-column)
		  entry desc))))
    entries "\n")))

(defun org-texinfo--menu-entries (scope info)
  "List direct children in SCOPE needing a menu entry.
SCOPE is a headline or a full parse tree.  INFO is a plist
holding contextual information."
  (let* ((cache (or (plist-get info :texinfo-entries-cache)
		    (plist-get (plist-put info :texinfo-entries-cache
					  (make-hash-table :test #'eq))
			       :texinfo-entries-cache)))
	 (cached-entries (gethash scope cache 'no-cache)))
    (if (not (eq cached-entries 'no-cache)) cached-entries
      (puthash scope
	       (org-element-map (org-element-contents scope) 'headline
		 (lambda (h)
		   (and (not (org-not-nil (org-element-property :COPYING h)))
			(not (org-element-property :footnote-section-p h))
			(not (org-export-low-level-p h info))
			h))
		 info nil 'headline)
	       cache))))

;;;; Node Property

(defun org-texinfo-node-property (node-property contents info)
  "Transcode a NODE-PROPERTY element from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual
information."
  (format "%s:%s"
          (org-element-property :key node-property)
          (let ((value (org-element-property :value node-property)))
            (if value (concat " " value) ""))))

;;;; Paragraph

(defun org-texinfo-paragraph (paragraph contents info)
  "Transcode a PARAGRAPH element from Org to Texinfo.
CONTENTS is the contents of the paragraph, as a string.  INFO is
the plist used as a communication channel."
  contents)

;;;; Plain List

(defun org-texinfo-plain-list (plain-list contents info)
  "Transcode a PLAIN-LIST element from Org to Texinfo.
CONTENTS is the contents of the list.  INFO is a plist holding
contextual information."
  (let* ((attr (org-export-read-attribute :attr_texinfo plain-list))
	 (indic (or (plist-get attr :indic)
		    (plist-get info :texinfo-def-table-markup)))
	 (table-type (plist-get attr :table-type))
	 (type (org-element-property :type plain-list))
	 (list-type (cond
		     ((eq type 'ordered) "enumerate")
		     ((eq type 'unordered) "itemize")
		     ((member table-type '("ftable" "vtable")) table-type)
		     (t "table"))))
    (format "@%s\n%s@end %s"
	    (if (eq type 'descriptive) (concat list-type " " indic) list-type)
	    contents
	    list-type)))

;;;; Plain Text

(defun org-texinfo-plain-text (text info)
  "Transcode a TEXT string from Org to Texinfo.
TEXT is the string to transcode.  INFO is a plist holding
contextual information."
  ;; First protect @, { and }.
  (let ((output (org-texinfo--sanitize-content text)))
    ;; Activate smart quotes.  Be sure to provide original TEXT string
    ;; since OUTPUT may have been modified.
    (when (plist-get info :with-smart-quotes)
      (setq output
	    (org-export-activate-smart-quotes output :texinfo info text)))
    ;; LaTeX into @LaTeX{} and TeX into @TeX{}
    (let ((case-fold-search nil)
	  (start 0))
      (while (string-match "\\(\\(?:La\\)?TeX\\)" output start)
	(setq output (replace-match
		      (format "@%s{}" (match-string 1 output)) nil t output)
	      start (match-end 0))))
    ;; Convert special strings.
    (when (plist-get info :with-special-strings)
      (while (string-match (regexp-quote "...") output)
	(setq output (replace-match "@dots{}" nil t output))))
    ;; Handle break preservation if required.
    (when (plist-get info :preserve-breaks)
      (setq output (replace-regexp-in-string
		    "\\(\\\\\\\\\\)?[ \t]*\n" " @*\n" output)))
    ;; Return value.
    output))

;;;; Planning

(defun org-texinfo-planning (planning contents info)
  "Transcode a PLANNING element from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual
information."
  (concat
   "@noindent"
   (mapconcat
    'identity
    (delq nil
	  (list
	   (let ((closed (org-element-property :closed planning)))
	     (when closed
	       (concat
		(format "@strong{%s} " org-closed-string)
		(format (plist-get info :texinfo-inactive-timestamp-format)
			(org-timestamp-translate closed)))))
	   (let ((deadline (org-element-property :deadline planning)))
	     (when deadline
	       (concat
		(format "@strong{%s} " org-deadline-string)
		(format (plist-get info :texinfo-active-timestamp-format)
			(org-timestamp-translate deadline)))))
	   (let ((scheduled (org-element-property :scheduled planning)))
	     (when scheduled
	       (concat
		(format "@strong{%s} " org-scheduled-string)
		(format (plist-get info :texinfo-active-timestamp-format)
			(org-timestamp-translate scheduled)))))))
    " ")
   "@*"))

;;;; Property Drawer

(defun org-texinfo-property-drawer (property-drawer contents info)
  "Transcode a PROPERTY-DRAWER element from Org to Texinfo.
CONTENTS holds the contents of the drawer.  INFO is a plist
holding contextual information."
  (and (org-string-nw-p contents)
       (format "@verbatim\n%s@end verbatim" contents)))

;;;; Quote Block

(defun org-texinfo-quote-block (quote-block contents info)
  "Transcode a QUOTE-BLOCK element from Org to Texinfo.
CONTENTS holds the contents of the block.  INFO is a plist
holding contextual information."
  (let* ((title (org-element-property :name quote-block))
	 (start-quote (concat "@quotation"
			      (if title
				  (format " %s" title)))))
    (format "%s\n%s@end quotation" start-quote contents)))

;;;; Radio Target

(defun org-texinfo-radio-target (radio-target text info)
  "Transcode a RADIO-TARGET object from Org to Texinfo.
TEXT is the text of the target.  INFO is a plist holding
contextual information."
  (format "@anchor{%s}%s"
	  (org-export-get-reference radio-target info)
	  text))

;;;; Section

(defun org-texinfo-section (section contents info)
  "Transcode a SECTION element from Org to Texinfo.
CONTENTS holds the contents of the section.  INFO is a plist
holding contextual information."
  (concat contents
	  (let ((parent (org-export-get-parent-headline section)))
	    (and parent (org-texinfo-make-menu parent info)))))

;;;; Special Block

(defun org-texinfo-special-block (special-block contents info)
  "Transcode a SPECIAL-BLOCK element from Org to Texinfo.
CONTENTS holds the contents of the block.  INFO is a plist used
as a communication channel."
  (let ((type (org-element-property :type special-block)))
    (format "@%s\n%s@end %s" type contents type)))

;;;; Src Block

(defun org-texinfo-src-block (src-block contents info)
  "Transcode a SRC-BLOCK element from Org to Texinfo.
CONTENTS holds the contents of the item.  INFO is a plist holding
contextual information."
  (let* ((lisp (org-string-match-p "lisp"
				   (org-element-property :language src-block)))
	 (code (org-texinfo--sanitize-content
		(org-export-format-code-default src-block info)))
	 (value (format
		 (if lisp "@lisp\n%s@end lisp" "@example\n%s@end example")
		 code))
	 (caption (org-export-get-caption src-block))
	 (shortcaption (org-export-get-caption src-block t)))
    (if (not (or caption shortcaption)) value
      (org-texinfo--wrap-float value
			       info
			       (org-export-translate "Listing" :utf-8 info)
			       (org-export-get-reference src-block info)
			       caption
			       shortcaption))))

;;;; Statistics Cookie

(defun org-texinfo-statistics-cookie (statistics-cookie contents info)
  "Transcode a STATISTICS-COOKIE object from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual information."
  (org-element-property :value statistics-cookie))

;;;; Subscript

(defun org-texinfo-subscript (subscript contents info)
  "Transcode a SUBSCRIPT object from Org to Texinfo.
CONTENTS is the contents of the object.  INFO is a plist holding
contextual information."
  (format "@math{_%s}" contents))

;;;; Superscript

(defun org-texinfo-superscript (superscript contents info)
  "Transcode a SUPERSCRIPT object from Org to Texinfo.
CONTENTS is the contents of the object.  INFO is a plist holding
contextual information."
  (format "@math{^%s}" contents))

;;;; Table

(defun org-texinfo-table (table contents info)
  "Transcode a TABLE element from Org to Texinfo.
CONTENTS is the contents of the table.  INFO is a plist holding
contextual information."
  (if (eq (org-element-property :type table) 'table.el)
      (format "@verbatim\n%s@end verbatim"
	      (org-element-normalize-string
	       (org-element-property :value table)))
    (let* ((col-width (org-export-read-attribute :attr_texinfo table :columns))
	   (columns
	    (if col-width (format "@columnfractions %s" col-width)
	      (org-texinfo-table-column-widths table info)))
	   (caption (org-export-get-caption table))
	   (shortcaption (org-export-get-caption table t))
	   (table-str (format "@multitable %s\n%s@end multitable"
			      columns
			      contents)))
      (if (not (or caption shortcaption)) table-str
	(org-texinfo--wrap-float table-str
				 info
				 (org-export-translate "Table" :utf-8 info)
				 (org-export-get-reference table info)
				 caption
				 shortcaption)))))

(defun org-texinfo-table-column-widths (table info)
  "Determine the largest table cell in each column to process alignment.
TABLE is the table element to transcode.  INFO is a plist used as
a communication channel."
  (let ((widths (make-vector (cdr (org-export-table-dimensions table info)) 0)))
    (org-element-map table 'table-row
      (lambda (row)
	(let ((idx 0))
	  (org-element-map row 'table-cell
	    (lambda (cell)
	      ;; Length of the cell in the original buffer is only an
	      ;; approximation of the length of the cell in the
	      ;; output.  It can sometimes fail (e.g. it considers
	      ;; "/a/" being larger than "ab").
	      (let ((w (- (org-element-property :contents-end cell)
			  (org-element-property :contents-begin cell))))
		(aset widths idx (max w (aref widths idx))))
	      (incf idx))
	    info)))
      info)
    (format "{%s}" (mapconcat (lambda (w) (make-string w ?a)) widths "} {"))))

;;;; Table Cell

(defun org-texinfo-table-cell (table-cell contents info)
  "Transcode a TABLE-CELL element from Org to Texinfo.
CONTENTS is the cell contents.  INFO is a plist used as
a communication channel."
  (concat
   (let ((scientific-notation
	  (plist-get info :texinfo-table-scientific-notation)))
     (if (and contents
	      scientific-notation
	      (string-match orgtbl-exp-regexp contents))
	 ;; Use appropriate format string for scientific notation.
	 (format scientific-notation
		 (match-string 1 contents)
		 (match-string 2 contents))
       contents))
   (when (org-export-get-next-element table-cell info) "\n@tab ")))

;;;; Table Row

(defun org-texinfo-table-row (table-row contents info)
  "Transcode a TABLE-ROW element from Org to Texinfo.
CONTENTS is the contents of the row.  INFO is a plist used as
a communication channel."
  ;; Rules are ignored since table separators are deduced from
  ;; borders of the current row.
  (when (eq (org-element-property :type table-row) 'standard)
    (let ((rowgroup-tag
	   (if (and (= 1 (org-export-table-row-group table-row info))
		    (org-export-table-has-header-p
		     (org-export-get-parent-table table-row) info))
	       "@headitem "
	     "@item ")))
      (concat rowgroup-tag contents "\n"))))

;;;; Target

(defun org-texinfo-target (target contents info)
  "Transcode a TARGET object from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual
information."
  (format "@anchor{%s}" (org-export-get-reference target info)))

;;;; Timestamp

(defun org-texinfo-timestamp (timestamp contents info)
  "Transcode a TIMESTAMP object from Org to Texinfo.
CONTENTS is nil.  INFO is a plist holding contextual
information."
  (let ((value (org-texinfo-plain-text
		(org-timestamp-translate timestamp) info)))
    (case (org-element-property :type timestamp)
      ((active active-range)
       (format (plist-get info :texinfo-active-timestamp-format) value))
      ((inactive inactive-range)
       (format (plist-get info :texinfo-inactive-timestamp-format) value))
      (t (format (plist-get info :texinfo-diary-timestamp-format) value)))))

;;;; Verbatim

(defun org-texinfo-verbatim (verbatim contents info)
  "Transcode a VERBATIM object from Org to Texinfo.
CONTENTS is nil.  INFO is a plist used as a communication
channel."
  (org-texinfo--text-markup
   (org-element-property :value verbatim) 'verbatim info))

;;;; Verse Block

(defun org-texinfo-verse-block (verse-block contents info)
  "Transcode a VERSE-BLOCK element from Org to Texinfo.
CONTENTS is verse block contents. INFO is a plist holding
contextual information."
  (format "@display\n%s@end display" contents))

\f
;;; Interactive functions

(defun org-texinfo-export-to-texinfo
    (&optional async subtreep visible-only body-only draft ext-plist)
  "Export current buffer to a Texinfo file.

If narrowing is active in the current buffer, only export its
narrowed part.

If a region is active, export that region.

A non-nil optional argument ASYNC means the process should happen
asynchronously.  The resulting file should be accessible through
the `org-export-stack' interface.

When optional argument SUBTREEP is non-nil, export the sub-tree
at point, extracting information from the headline properties
first.

When optional argument VISIBLE-ONLY is non-nil, don't export
contents of hidden elements.

When optional argument BODY-ONLY is non-nil, only write code
between \"\\begin{document}\" and \"\\end{document}\".

When optional argument DRAFT is non-nil, ignore user
errors (e.g., invalid links) during the process.

EXT-PLIST, when provided, is a property list with external
parameters overriding Org default settings, but still inferior to
file-local settings.

Return output file's name."
  (interactive)
  (let ((outfile (org-export-output-file-name ".texi" subtreep))
	(org-export-coding-system org-texinfo-coding-system))
    (org-export-to-file 'texinfo outfile
      async subtreep visible-only body-only draft ext-plist)))

(defun org-texinfo-export-to-info
    (&optional async subtreep visible-only body-only draft ext-plist)
  "Export current buffer to Texinfo then process through to INFO.

If narrowing is active in the current buffer, only export its
narrowed part.

If a region is active, export that region.

A non-nil optional argument ASYNC means the process should happen
asynchronously.  The resulting file should be accessible through
the `org-export-stack' interface.

When optional argument SUBTREEP is non-nil, export the sub-tree
at point, extracting information from the headline properties
first.

When optional argument VISIBLE-ONLY is non-nil, don't export
contents of hidden elements.

When optional argument BODY-ONLY is non-nil, only write code
between \"\\begin{document}\" and \"\\end{document}\".

When optional argument DRAFT is non-nil, ignore user
errors (e.g., invalid links) during the process.

EXT-PLIST, when provided, is a property list with external
parameters overriding Org default settings, but still inferior to
file-local settings.

When optional argument PUB-DIR is set, use it as the publishing
directory.

Return INFO file's name."
  (interactive)
  (let ((outfile (org-export-output-file-name ".texi" subtreep))
	(org-export-coding-system org-texinfo-coding-system))
    (org-export-to-file 'texinfo outfile
      async subtreep visible-only body-only draft ext-plist
      (lambda (file) (org-texinfo-compile file)))))

;;;###autoload
(defun org-texinfo-publish-to-texinfo (plist filename pub-dir)
  "Publish an org file to Texinfo.

FILENAME is the filename of the Org file to be published.  PLIST
is the property list for the given project.  PUB-DIR is the
publishing directory.

Return output file name."
  (org-publish-org-to 'texinfo filename ".texi" plist pub-dir))

;;;###autoload
(defun org-texinfo-convert-region-to-texinfo ()
  "Assume the current region has org-mode syntax, and convert it to Texinfo.
This can be used in any buffer.  For example, you can write an
itemized list in org-mode syntax in an Texinfo buffer and use
this command to convert it."
  (interactive)
  (org-export-replace-region-by 'texinfo))

(defun org-texinfo-compile (file)
  "Compile a texinfo file.

FILE is the name of the file being compiled.  Processing is
done through the command specified in `org-texinfo-info-process'.

Return INFO file name or an error if it couldn't be produced."
  (let* ((base-name (file-name-sans-extension (file-name-nondirectory file)))
	 (full-name (file-truename file))
	 (out-dir (file-name-directory file))
	 ;; Properly set working directory for compilation.
	 (default-directory (if (file-name-absolute-p file)
				(file-name-directory full-name)
			      default-directory))
	 errors)
    (message "Processing Texinfo file %s..." file)
    (save-window-excursion
      ;; Replace %b, %f and %o with appropriate values in each command
      ;; before applying it.  Output is redirected to "*Org INFO
      ;; Texinfo Output*" buffer.
      (let ((outbuf (get-buffer-create "*Org INFO Texinfo Output*")))
	(with-current-buffer outbuf (compilation-mode))
	(dolist (command org-texinfo-info-process)
	  (shell-command
	   (replace-regexp-in-string
	    "%b" (shell-quote-argument base-name)
	    (replace-regexp-in-string
	     "%f" (shell-quote-argument full-name)
	     (replace-regexp-in-string
	      "%o" (shell-quote-argument out-dir) command t t) t t) t t)
	   outbuf))
	;; Collect standard errors from output buffer.
	(setq errors (org-texinfo-collect-errors outbuf)))
      (let ((infofile (concat out-dir base-name ".info")))
	;; Check for process failure.  Provide collected errors if
	;; possible.
	(if (not (file-exists-p infofile))
	    (error "INFO file %s wasn't produced%s" infofile
		   (if errors (concat ": " errors) ""))
	  ;; Else remove log files, when specified, and signal end of
	  ;; process to user, along with any error encountered.
	  (when org-texinfo-remove-logfiles
	    (dolist (ext org-texinfo-logfiles-extensions)
	      (let ((file (concat out-dir base-name "." ext)))
		(when (file-exists-p file) (delete-file file)))))
	  (message (concat "Process completed"
			   (if (not errors) "."
			     (concat " with errors: " errors)))))
	;; Return output file name.
	infofile))))

(defun org-texinfo-collect-errors (buffer)
  "Collect some kind of errors from \"makeinfo\" command output.

BUFFER is the buffer containing output.

Return collected error types as a string, or nil if there was
none."
  (with-current-buffer buffer
    (save-excursion
      (goto-char (point-min))
      ;; Find final "makeinfo" run.
      (when t
	(let ((case-fold-search t)
	      (errors ""))
	  (when (save-excursion
		  (re-search-forward "perhaps incorrect sectioning?" nil t))
	    (setq errors (concat errors " [incorrect sectioning]")))
	  (when (save-excursion
		  (re-search-forward "missing close brace" nil t))
	    (setq errors (concat errors " [syntax error]")))
	  (when (save-excursion
		  (re-search-forward "Unknown command" nil t))
	    (setq errors (concat errors " [undefined @command]")))
	  (when (save-excursion
		  (re-search-forward "No matching @end" nil t))
	    (setq errors (concat errors " [block incomplete]")))
	  (when (save-excursion
		  (re-search-forward "requires a sectioning" nil t))
	    (setq errors (concat errors " [invalid section command]")))
	  (when (save-excursion
		  (re-search-forward "\\[unexpected\ ]" nil t))
	    (setq errors (concat errors " [unexpected error]")))
	  (when (save-excursion
		  (re-search-forward "misplaced " nil t))
	    (setq errors (concat errors " [syntax error]")))
	  (and (org-string-nw-p errors) (org-trim errors)))))))


(provide 'ox-texinfo)

;; Local variables:
;; generated-autoload-file: "org-loaddefs.el"
;; End:

;;; ox-texinfo.el ends here