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;;; org-latex.el --- LaTeX exporter for org-mode
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;;
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;; Copyright (C) 2007-2011 Free Software Foundation, Inc.
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;;
;; Emacs Lisp Archive Entry
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;; Filename: org-latex.el
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;; Version: 7.4
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;; Author: Bastien Guerry <bzg AT altern DOT org>
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;; Maintainer: Carsten Dominik <carsten.dominik AT gmail DOT com>
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;; Keywords: org, wp, tex
;; Description: Converts an org-mode buffer into LaTeX
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;; This file is part of GNU Emacs.
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;; 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.

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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

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;;; Commentary:
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;;
;; This library implements a LaTeX exporter for org-mode.
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;;
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;; It is part of Org and will be autoloaded
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;;
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;; The interactive functions are similar to those of the HTML exporter:
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;;
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;; M-x `org-export-as-latex'
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;; M-x `org-export-as-pdf'
;; M-x `org-export-as-pdf-and-open'
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;; M-x `org-export-as-latex-batch'
;; M-x `org-export-as-latex-to-buffer'
;; M-x `org-export-region-as-latex'
;; M-x `org-replace-region-by-latex'
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;;
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;;; Code:

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

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(require 'footnote)
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(require 'org)
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(require 'org-exp)
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(require 'org-macs)
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(require 'org-beamer)
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;;; Variables:
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(defvar org-export-latex-class nil)
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(defvar org-export-latex-class-options nil)
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(defvar org-export-latex-header nil)
(defvar org-export-latex-append-header nil)
(defvar org-export-latex-options-plist nil)
(defvar org-export-latex-todo-keywords-1 nil)
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(defvar org-export-latex-complex-heading-re nil)
(defvar org-export-latex-not-done-keywords nil)
(defvar org-export-latex-done-keywords nil)
(defvar org-export-latex-display-custom-times nil)
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(defvar org-export-latex-all-targets-re nil)
(defvar org-export-latex-add-level 0)
(defvar org-export-latex-sectioning "")
(defvar org-export-latex-sectioning-depth 0)
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(defvar org-export-latex-special-keyword-regexp
  (concat "\\<\\(" org-scheduled-string "\\|"
	  org-deadline-string "\\|"
	  org-closed-string"\\)")
  "Regexp matching special time planning keywords plus the time after it.")
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(defvar latexp)    ; dynamically scoped from org.el
(defvar re-quote)  ; dynamically scoped from org.el
(defvar commentsp) ; dynamically scoped from org.el

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;;; User variables:
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(defgroup org-export-latex nil
  "Options for exporting Org-mode files to LaTeX."
  :tag "Org Export LaTeX"
  :group 'org-export)

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(defcustom org-export-latex-default-class "article"
  "The default LaTeX class."
  :group 'org-export-latex
  :type '(string :tag "LaTeX class"))
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(defcustom org-export-latex-classes
  '(("article"
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     "\\documentclass[11pt]{article}"
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     ("\\section{%s}" . "\\section*{%s}")
     ("\\subsection{%s}" . "\\subsection*{%s}")
     ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
     ("\\paragraph{%s}" . "\\paragraph*{%s}")
     ("\\subparagraph{%s}" . "\\subparagraph*{%s}"))
    ("report"
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     "\\documentclass[11pt]{report}"
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     ("\\part{%s}" . "\\part*{%s}")
     ("\\chapter{%s}" . "\\chapter*{%s}")
     ("\\section{%s}" . "\\section*{%s}")
     ("\\subsection{%s}" . "\\subsection*{%s}")
     ("\\subsubsection{%s}" . "\\subsubsection*{%s}"))
    ("book"
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     "\\documentclass[11pt]{book}"
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     ("\\part{%s}" . "\\part*{%s}")
     ("\\chapter{%s}" . "\\chapter*{%s}")
     ("\\section{%s}" . "\\section*{%s}")
     ("\\subsection{%s}" . "\\subsection*{%s}")
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     ("\\subsubsection{%s}" . "\\subsubsection*{%s}"))
    ("beamer"
     "\\documentclass{beamer}"
     org-beamer-sectioning
     ))
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  "Alist of LaTeX classes and associated header and structure.
If #+LaTeX_CLASS is set in the buffer, use its value and the
associated information.  Here is the structure of each cell:

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

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

The HEADER-STRING is the header that will be inserted into the LaTeX file.
It should contain the \\documentclass macro, and anything else that is needed
for this setup.  To this header, the following commands will be added:

- Calls to \\usepackage for all packages mentioned in the variables
  `org-export-latex-default-packages-alist' and
  `org-export-latex-packages-alist'.  Thus, your header definitions should
  avoid to also request these packages.

- Lines specified via \"#+LaTeX_HEADER:\"

If you need more control about the sequence in which the header is built
up, or if you want to exclude one of these building blocks for a particular
class, you can use the following macro-like placeholders.

 [DEFAULT-PACKAGES]      \\usepackage statements for default packages
 [NO-DEFAULT-PACKAGES]   do not include any of the default packages
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 [PACKAGES]              \\usepackage statements for packages
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 [NO-PACKAGES]           do not include the packages
 [EXTRA]                 the stuff from #+LaTeX_HEADER
 [NO-EXTRA]              do not include #+LaTeX_HEADER stuff
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 [BEAMER-HEADER-EXTRA]   the beamer extra headers
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So a header like

  \\documentclass{article}
  [NO-DEFAULT-PACKAGES]
  [EXTRA]
  \\providecommand{\\alert}[1]{\\textbf{#1}}
  [PACKAGES]

will omit the default packages, and will include the #+LaTeX_HEADER lines,
then have a call to \\providecommand, and then place \\usepackage commands
based on the content of `org-export-latex-packages-alist'.

If your header or `org-export-latex-default-packages-alist' inserts
\"\\usepackage[AUTO]{inputenc}\", AUTO will automatically be replaced with
a coding system derived from `buffer-file-coding-system'.  See also the
variable `org-export-latex-inputenc-alist' for a way to influence this
mechanism.

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.
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Instead of a cons cell (numbered . unnumbered), you can also provide a list
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of 2 or 4 elements,
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  (numbered-open numbered-close)

or

  (numbered-open numbered-close unnumbered-open unnumbered-close)

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providing opening and closing strings for a LaTeX environment that should
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represent the document section.  The opening clause should have a %s
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to represent the section title.

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 the headline text.  The function
must return a cons cell with the (possibly modified) headline text, and the
sectioning list in the cdr."
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  :group 'org-export-latex
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  :type '(repeat
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	  (list (string :tag "LaTeX class")
		(string :tag "LaTeX header")
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		(repeat :tag "Levels" :inline t
			(choice
			 (cons :tag "Heading"
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			       (string :tag "  numbered")
			       (string :tag "unnumbered"))
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			 (list :tag "Environment"
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			       (string :tag "Opening   (numbered)")
			       (string :tag "Closing   (numbered)")
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			       (string :tag "Opening (unnumbered)")
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			       (string :tag "Closing (unnumbered)"))
			 (function :tag "Hook computing sectioning"))))))

(defcustom org-export-latex-inputenc-alist nil
  "Alist of inputenc coding system names, and what should really be used.
For example, adding an entry

      (\"utf8\" . \"utf8x\")

will cause \\usepackage[utf8x]{inputenc} to be used for buffers that
are written as utf8 files."
  :group 'org-export-latex
  :type '(repeat
	  (cons
	   (string :tag "Derived from buffer")
	   (string :tag "Use this instead"))))

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(defcustom org-export-latex-emphasis-alist
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  '(("*" "\\textbf{%s}" nil)
    ("/" "\\emph{%s}" nil)
    ("_" "\\underline{%s}" nil)
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    ("+" "\\st{%s}" nil)
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    ("=" "\\verb" t)
    ("~" "\\verb" t))
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  "Alist of LaTeX expressions to convert emphasis fontifiers.
Each element of the list is a list of three elements.
The first element is the character used as a marker for fontification.
The second element is a formatting string to wrap fontified text with.
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If it is \"\\verb\", Org will automatically select a delimiter
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character that is not in the string.
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The third element decides whether to protect converted text from other
conversions."
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  :group 'org-export-latex
  :type 'alist)

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(defcustom org-export-latex-title-command "\\maketitle"
  "The command used to insert the title just after \\begin{document}.
If this string contains the formatting specification \"%s\" then
it will be used as a formatting string, passing the title as an
argument."
  :group 'org-export-latex
  :type 'string)

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(defcustom org-export-latex-import-inbuffer-stuff nil
  "Non-nil means define TeX macros for Org's inbuffer definitions.
For example \orgTITLE for #+TITLE."
  :group 'org-export-latex
  :type 'boolean)

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(defcustom org-export-latex-date-format
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  "%d %B %Y"
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  "Format string for \\date{...}."
  :group 'org-export-latex
  :type 'string)

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(defcustom org-export-latex-todo-keyword-markup "\\textbf{%s}"
  "Markup for TODO keywords, as a printf format.
This can be a single format for all keywords, a cons cell with separate
formats for not-done and done states, or an association list with setup
for individual keywords.  If a keyword shows up for which there is no
markup defined, the first one in the association list will be used."
  :group 'org-export-latex
  :type '(choice
	  (string :tag "Default")
	  (cons :tag "Distinguish undone and done"
		(string :tag "Not-DONE states")
		(string :tag "DONE states"))
	  (repeat :tag "Per keyword markup"
		  (cons
		   (string :tag "Keyword")
		   (string :tag "Markup")))))

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(defcustom org-export-latex-tag-markup "\\textbf{%s}"
  "Markup for tags, as a printf format."
  :group 'org-export-latex
  :type 'string)

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(defcustom org-export-latex-timestamp-markup "\\textit{%s}"
  "A printf format string to be applied to time stamps."
  :group 'org-export-latex
  :type 'string)

(defcustom org-export-latex-timestamp-keyword-markup "\\texttt{%s}"
  "A printf format string to be applied to time stamps."
  :group 'org-export-latex
  :type 'string)

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(defcustom org-export-latex-href-format "\\href{%s}{%s}"
  "A printf format string to be applied to href links.
The format must contain two %s instances.  The first will be filled with
the link, the second with the link description."
  :group 'org-export-latex
  :type 'string)

(defcustom org-export-latex-hyperref-format "\\hyperref[%s]{%s}"
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  "A printf format string to be applied to hyperref links.
The format must contain two %s instances.  The first will be filled with
the link, the second with the link description."
  :group 'org-export-latex
  :type 'string)

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

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(defcustom org-export-latex-tables-centered t
  "When non-nil, tables are exported in a center environment."
  :group 'org-export-latex
  :type 'boolean)

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(defcustom org-export-latex-tables-column-borders nil
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  "When non-nil, grouping columns can cause outer vertical lines in tables.
When nil, grouping causes only separation lines between groups."
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  :group 'org-export-latex
  :type 'boolean)
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(defcustom org-export-latex-low-levels 'itemize
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  "How to convert sections below the current level of sectioning.
This is specified by the `org-export-headline-levels' option or the
value of \"H:\" in Org's #+OPTION line.
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This can be either nil (skip the sections), `description', `itemize',
or `enumerate' (convert the sections as the corresponding list type), or
a string to be used instead of \\section{%s}.  In this latter case,
the %s stands here for the inserted headline and is mandatory.

It may also be a list of three string to define a user-defined environment
that should be used.  The first string should be the like
\"\\begin{itemize}\", the second should be like \"\\item %s %s\" with up
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to two occurrences of %s for the title and a label, respectively.  The third
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string should be like \"\\end{itemize\"."
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  :group 'org-export-latex
  :type '(choice (const :tag "Ignore" nil)
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		 (const :tag "Convert as descriptive list" description)
		 (const :tag "Convert as itemized list" itemize)
		 (const :tag "Convert as enumerated list" enumerate)
		 (list  :tag "User-defined environment"
			:value ("\\begin{itemize}" "\\end{itemize}" "\\item %s")
			(string :tag "Start")
			(string :tag "End")
			(string :tag "item"))
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		 (string :tag "Use a section string" :value "\\subparagraph{%s}")))

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(defcustom org-export-latex-list-parameters
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  '(:cbon "$\\boxtimes$" :cboff "$\\Box$")
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  "Parameters for the LaTeX list exporter.
These parameters will be passed on to `org-list-to-latex', which in turn
will pass them (combined with the LaTeX default list parameters) to
`org-list-to-generic'."
  :group 'org-export-latex
  :type 'plist)

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(defcustom org-export-latex-verbatim-wrap
  '("\\begin{verbatim}\n" . "\\end{verbatim}\n")
  "Environment to be wrapped around a fixed-width section in LaTeX export.
This is a cons with two strings, to be added before and after the
fixed-with text.

Defaults to \\begin{verbatim} and \\end{verbatim}."
  :group 'org-export-translation
  :group 'org-export-latex
  :type '(cons (string :tag "Open")
	       (string :tag "Close")))

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(defcustom org-export-latex-listings nil
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  "Non-nil means export source code using the listings package.
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This package will fontify source code, possibly even with color.
If you want to use this, you also need to make LaTeX use the
listings package, and if you want to have color, the color
package.  Just add these to `org-export-latex-packages-alist',
for example using customize, or with something like

  (require 'org-latex)
  (add-to-list 'org-export-latex-packages-alist '(\"\" \"listings\"))
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  (add-to-list 'org-export-latex-packages-alist '(\"\" \"color\"))

Alternatively,

  (setq org-export-latex-listings 'minted)

causes source code to be exported using the minted package as
opposed to listings. If you want to use minted, you need to add
the minted package to `org-export-latex-packages-alist', for
example using customize, or with

  (require 'org-latex)
  (add-to-list 'org-export-latex-packages-alist '(\"\" \"minted\"))

In addition, it is neccessary to install
pygments (http://pygments.org), and to configure
`org-latex-to-pdf-process' so that the -shell-escape option is
passed to pdflatex.
"
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  :group 'org-export-latex
  :type 'boolean)

(defcustom org-export-latex-listings-langs
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  '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
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    (c "C") (cc "C++")
    (fortran "fortran")
    (perl "Perl") (cperl "Perl") (python "Python") (ruby "Ruby")
    (html "HTML") (xml "XML")
    (tex "TeX") (latex "TeX")
    (shell-script "bash")
    (gnuplot "Gnuplot")
    (ocaml "Caml") (caml "Caml")
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    (sql "SQL") (sqlite "sql"))
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  "Alist mapping languages to their listing language counterpart.
The key is a symbol, the major mode symbol without the \"-mode\".
The value is the string that should be inserted as the language parameter
for the listings package.  If the mode name and the listings name are
the same, the language does not need an entry in this list - but it does not
hurt if it is present."
  :group 'org-export-latex
  :type '(repeat
	  (list
	   (symbol :tag "Major mode       ")
	   (string :tag "Listings language"))))

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(defcustom org-export-latex-listings-w-names t
  "Non-nil means export names of named code blocks.
Code blocks exported with the listings package (controlled by the
`org-export-latex-listings' variable) can be named in the style
of noweb."
  :group 'org-export-latex
  :type 'boolean)

(defcustom org-export-latex-minted-langs
  '((emacs-lisp "common-lisp")
    (cc "c++")
    (cperl "perl")
    (shell-script "bash")
    (caml "ocaml"))
  "Alist mapping languages to their minted language counterpart.
The key is a symbol, the major mode symbol without the \"-mode\".
The value is the string that should be inserted as the language parameter
for the minted package.  If the mode name and the listings name are
the same, the language does not need an entry in this list - but it does not
hurt if it is present.

Note that minted uses all lower case for language identifiers,
and that the full list of language identifiers can be obtained
with:
pygmentize -L lexers
"
  :group 'org-export-latex
  :type '(repeat
	  (list
	   (symbol :tag "Major mode       ")
	   (string :tag "Listings language"))))

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(defcustom org-export-latex-remove-from-headlines
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  '(:todo nil :priority nil :tags nil)
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  "A plist of keywords to remove from headlines.  OBSOLETE.
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Non-nil means remove this keyword type from the headline.

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Don't remove the keys, just change their values.

Obsolete, this variable is no longer used.  Use the separate
variables `org-export-with-todo-keywords', `org-export-with-priority',
and `org-export-with-tags' instead."
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  :type 'plist
  :group 'org-export-latex)

(defcustom org-export-latex-image-default-option "width=10em"
  "Default option for images."
  :group 'org-export-latex
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  :type 'string)
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(defcustom org-export-latex-tabular-environment "tabular"
  "Default environment used to build tables."
  :group 'org-export-latex
  :type 'string)

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(defcustom org-export-latex-inline-image-extensions
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  '("pdf" "jpeg" "jpg" "png" "ps" "eps")
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  "Extensions of image files that can be inlined into LaTeX.
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Note that the image extension *actually* allowed depend on the way the
LaTeX file is processed.  When used with pdflatex, pdf, jpg and png images
are OK.  When processing through dvi to Postscript, only ps and eps are
allowed.  The default we use here encompasses both."
  :group 'org-export-latex
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  :type '(repeat (string :tag "Extension")))

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(defcustom org-export-latex-coding-system nil
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  "Coding system for the exported LaTeX file."
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  :group 'org-export-latex
  :type 'coding-system)

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(defgroup org-export-pdf nil
  "Options for exporting Org-mode files to PDF, via LaTeX."
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  :tag "Org Export PDF"
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  :group 'org-export-latex
  :group 'org-export)

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(defcustom org-latex-to-pdf-process
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  '("pdflatex -interaction nonstopmode -output-directory %o %f"
    "pdflatex -interaction nonstopmode -output-directory %o %f"
    "pdflatex -interaction nonstopmode -output-directory %o %f")
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  "Commands to process a LaTeX file to a PDF file.
This is a list of strings, each of them will be given to the shell
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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.

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The reason why this is a list is that it usually takes several runs of
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`pdflatex', maybe mixed with a call to `bibtex'.  Org does not have a clever
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mechanism to detect which of these commands have to be run to get to a stable
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result, and it also does not do any error checking.

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By default, Org uses 3 runs of `pdflatex' to do the processing.  If you
have texi2dvi on your system and if that does not cause the infamous
egrep/locale bug:

     http://lists.gnu.org/archive/html/bug-texinfo/2010-03/msg00031.html

then `texi2dvi' is the superior choice.  Org does offer it as one
of the customize options.

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Alternatively, this may be a Lisp function that does the processing, so you
could use this to apply the machinery of AUCTeX or the Emacs LaTeX mode.
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This function should accept the file name as its single argument."
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  :group 'org-export-pdf
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  :type '(choice
	  (repeat :tag "Shell command sequence"
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		  (string :tag "Shell command"))
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	  (const :tag "2 runs of pdflatex"
		 ("pdflatex -interaction nonstopmode -output-directory %o %f"
		   "pdflatex -interaction nonstopmode -output-directory %o %f"))
	  (const :tag "3 runs of pdflatex"
		 ("pdflatex -interaction nonstopmode -output-directory %o %f"
		   "pdflatex -interaction nonstopmode -output-directory %o %f"
		   "pdflatex -interaction nonstopmode -output-directory %o %f"))
	  (const :tag "pdflatex,bibtex,pdflatex,pdflatex"
		 ("pdflatex -interaction nonstopmode -output-directory %o %f"
		   "bibtex %b"
		   "pdflatex -interaction nonstopmode -output-directory %o %f"
		   "pdflatex -interaction nonstopmode -output-directory %o %f"))
	  (const :tag "texi2dvi"
		 ("texi2dvi -p -b -c -V %f"))
	  (const :tag "rubber"
		 ("rubber -d --into %o %f"))
	  (function)))
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(defcustom org-export-pdf-logfiles
  '("aux" "idx" "log" "out" "toc" "nav" "snm" "vrb")
  "The list of file extensions to consider as LaTeX logfiles."
  :group 'org-export-pdf
  :type '(repeat (string :tag "Extension")))

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(defcustom org-export-pdf-remove-logfiles t
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  "Non-nil means remove the logfiles produced by PDF production.
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These are the .aux, .log, .out, and .toc files."
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  :group 'org-export-pdf
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  :type 'boolean)

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;;; Hooks

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(defvar org-export-latex-after-initial-vars-hook nil
  "Hook run before LaTeX export.
The exact moment is after the initial variables like org-export-latex-class
have been determined from the environment.")

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(defvar org-export-latex-after-blockquotes-hook nil
  "Hook run during LaTeX export, after blockquote, verse, center are done.")

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(defvar org-export-latex-final-hook nil
  "Hook run in the finalized LaTeX buffer.")

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(defvar org-export-latex-after-save-hook nil
  "Hook run in the finalized LaTeX buffer, after it has been saved.")

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;;; Autoload functions:
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;;;###autoload
(defun org-export-as-latex-batch ()
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  "Call `org-export-as-latex', may be used in batch processing.
For example:

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emacs   --batch
        --load=$HOME/lib/emacs/org.el
        --eval \"(setq org-export-headline-levels 2)\"
        --visit=MyFile --funcall org-export-as-latex-batch"
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  (org-export-as-latex org-export-headline-levels 'hidden))

;;;###autoload
(defun org-export-as-latex-to-buffer (arg)
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  "Call `org-export-as-latex` with output to a temporary buffer.
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No file is created.  The prefix ARG is passed through to `org-export-as-latex'."
  (interactive "P")
  (org-export-as-latex arg nil nil "*Org LaTeX Export*")
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  (when org-export-show-temporary-export-buffer
    (switch-to-buffer-other-window "*Org LaTeX Export*")))
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;;;###autoload
(defun org-replace-region-by-latex (beg end)
  "Replace the region from BEG to END with its LaTeX export.
It assumes the region has `org-mode' syntax, and then convert it to
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LaTeX.  This can be used in any buffer.  For example, you could
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write an itemized list in `org-mode' syntax in an LaTeX buffer and
then use this command to convert it."
  (interactive "r")
  (let (reg latex buf)
    (save-window-excursion
      (if (org-mode-p)
	  (setq latex (org-export-region-as-latex
		       beg end t 'string))
	(setq reg (buffer-substring beg end)
	      buf (get-buffer-create "*Org tmp*"))
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	(with-current-buffer buf
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	  (erase-buffer)
	  (insert reg)
	  (org-mode)
	  (setq latex (org-export-region-as-latex
		       (point-min) (point-max) t 'string)))
	(kill-buffer buf)))
    (delete-region beg end)
    (insert latex)))

;;;###autoload
(defun org-export-region-as-latex (beg end &optional body-only buffer)
  "Convert region from BEG to END in `org-mode' buffer to LaTeX.
If prefix arg BODY-ONLY is set, omit file header, footer, and table of
contents, and only produce the region of converted text, useful for
cut-and-paste operations.
If BUFFER is a buffer or a string, use/create that buffer as a target
of the converted LaTeX.  If BUFFER is the symbol `string', return the
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produced LaTeX as a string and leave no buffer behind.  For example,
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a Lisp program could call this function in the following way:

  (setq latex (org-export-region-as-latex beg end t 'string))

When called interactively, the output buffer is selected, and shown
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in a window.  A non-interactive call will only return the buffer."
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  (interactive "r\nP")
  (when (interactive-p)
    (setq buffer "*Org LaTeX Export*"))
  (let ((transient-mark-mode t) (zmacs-regions t)
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	ext-plist rtn)
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    (setq ext-plist (plist-put ext-plist :ignore-subtree-p t))
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    (goto-char end)
    (set-mark (point)) ;; to activate the region
    (goto-char beg)
    (setq rtn (org-export-as-latex
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	       nil nil ext-plist
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	       buffer body-only))
    (if (fboundp 'deactivate-mark) (deactivate-mark))
    (if (and (interactive-p) (bufferp rtn))
	(switch-to-buffer-other-window rtn)
      rtn)))

;;;###autoload
(defun org-export-as-latex (arg &optional hidden ext-plist
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				to-buffer body-only pub-dir)
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  "Export current buffer to a LaTeX file.
If there is an active region, export only the region.  The prefix
ARG specifies how many levels of the outline should become
headlines.  The default is 3.  Lower levels will be exported
depending on `org-export-latex-low-levels'.  The default is to
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convert them as description lists.
HIDDEN is obsolete and does nothing.
EXT-PLIST is a property list with
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external parameters overriding org-mode's default settings, but
still inferior to file-local settings.  When TO-BUFFER is
non-nil, create a buffer with that name and export to that
buffer.  If TO-BUFFER is the symbol `string', don't leave any
buffer behind but just return the resulting LaTeX as a string.
When BODY-ONLY is set, don't produce the file header and footer,
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simply return the content of \\begin{document}...\\end{document},
without even the \\begin{document} and \\end{document} commands.
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when PUB-DIR is set, use this as the publishing directory."
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  (interactive "P")
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  (when (and (not body-only) arg (listp arg)) (setq body-only t))
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  (run-hooks 'org-export-first-hook)

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  ;; Make sure we have a file name when we need it.
  (when (and (not (or to-buffer body-only))
	     (not buffer-file-name))
    (if (buffer-base-buffer)
	(org-set-local 'buffer-file-name
		       (with-current-buffer (buffer-base-buffer)
			 buffer-file-name))
      (error "Need a file name to be able to export")))

  (message "Exporting to LaTeX...")
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  (org-unmodified
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   (let ((inhibit-read-only t))
     (remove-text-properties (point-min) (point-max)
			     '(:org-license-to-kill nil))))
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  (org-update-radio-target-regexp)
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  (org-export-latex-set-initial-vars ext-plist arg)
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  (setq org-export-opt-plist org-export-latex-options-plist)
  (org-install-letbind)
  (run-hooks 'org-export-latex-after-initial-vars-hook)
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  (let* ((wcf (current-window-configuration))
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	 (opt-plist org-export-latex-options-plist)
	 (region-p (org-region-active-p))
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	 (rbeg (and region-p (region-beginning)))
	 (rend (and region-p (region-end)))
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	 (subtree-p
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	  (if (plist-get opt-plist :ignore-subtree-p)
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	      nil
	    (when region-p
	      (save-excursion
		(goto-char rbeg)
		(and (org-at-heading-p)
		     (>= (org-end-of-subtree t t) rend))))))
	 (opt-plist (setq org-export-opt-plist
			  (if subtree-p
			      (org-export-add-subtree-options opt-plist rbeg)
			    opt-plist)))
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	 ;; Make sure the variable contains the updated values.
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	 (org-export-latex-options-plist (setq org-export-opt-plist opt-plist))
	 ;; The following two are dynamically scoped into other
	 ;; routines below.
	 (org-current-export-dir
	  (or pub-dir (org-export-directory :html opt-plist)))
	 (org-current-export-file buffer-file-name)
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	 (title (or (and subtree-p (org-export-get-title-from-subtree))
		    (plist-get opt-plist :title)
		    (and (not
			  (plist-get opt-plist :skip-before-1st-heading))
			 (org-export-grab-title-from-buffer))
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		    (and buffer-file-name
			 (file-name-sans-extension
			  (file-name-nondirectory buffer-file-name)))
		    "No Title"))
	 (filename
	  (and (not to-buffer)
	       (concat
		(file-name-as-directory
		 (or pub-dir
		     (org-export-directory :LaTeX ext-plist)))
		(file-name-sans-extension
		 (or (and subtree-p
			  (org-entry-get rbeg "EXPORT_FILE_NAME" t))
		     (file-name-nondirectory ;sans-extension
		      (or buffer-file-name
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			  (error "Don't know which export file to use")))))
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		".tex")))
	 (filename
	  (and filename
	       (if (equal (file-truename filename)
			  (file-truename (or buffer-file-name "dummy.org")))
		   (concat filename ".tex")
		 filename)))
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	 (buffer (if to-buffer
		     (cond
		      ((eq to-buffer 'string) (get-buffer-create
					       "*Org LaTeX Export*"))
		      (t (get-buffer-create to-buffer)))
		   (find-file-noselect filename)))
	 (odd org-odd-levels-only)
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	 (header (org-export-latex-make-header title opt-plist))
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	 (skip (cond (subtree-p nil)
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		     (region-p nil)
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		     (t (plist-get opt-plist :skip-before-1st-heading))))
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	 (text (plist-get opt-plist :text))
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	 (org-export-preprocess-hook
	  (cons
	   `(lambda () (org-set-local 'org-complex-heading-regexp
				      ,org-export-latex-complex-heading-re))
	   org-export-preprocess-hook))
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	 (first-lines (if skip "" (org-export-latex-first-lines
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				   opt-plist
				   (if subtree-p
				       (save-excursion
					 (goto-char rbeg)
					 (point-at-bol 2))
				     rbeg)
				   (if region-p rend))))
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	 (coding-system (and (boundp 'buffer-file-coding-system)
			     buffer-file-coding-system))
	 (coding-system-for-write (or org-export-latex-coding-system
				      coding-system))
	 (save-buffer-coding-system (or org-export-latex-coding-system
					coding-system))
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	 (region (buffer-substring
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		  (if region-p (region-beginning) (point-min))
		  (if region-p (region-end) (point-max))))
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	 (text
	  (and text (string-match "\\S-" text)
	       (org-export-preprocess-string
		text
		:emph-multiline t
		:for-LaTeX t
		:comments nil
		:tags (plist-get opt-plist :tags)
		:priority (plist-get opt-plist :priority)
		:footnotes (plist-get opt-plist :footnotes)
		:drawers (plist-get opt-plist :drawers)
		:timestamps (plist-get opt-plist :timestamps)
		:todo-keywords (plist-get opt-plist :todo-keywords)
		:add-text nil
		:skip-before-1st-heading skip
		:select-tags nil
		:exclude-tags nil
		:LaTeX-fragments nil)))
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	 (string-for-export
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	  (org-export-preprocess-string
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	   region
	   :emph-multiline t
	   :for-LaTeX t
	   :comments nil
	   :tags (plist-get opt-plist :tags)
	   :priority (plist-get opt-plist :priority)
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	   :footnotes (plist-get opt-plist :footnotes)
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	   :drawers (plist-get opt-plist :drawers)
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	   :timestamps (plist-get opt-plist :timestamps)
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	   :todo-keywords (plist-get opt-plist :todo-keywords)
	   :add-text (if (eq to-buffer 'string) nil text)
	   :skip-before-1st-heading skip
	   :select-tags (plist-get opt-plist :select-tags)
	   :exclude-tags (plist-get opt-plist :exclude-tags)
	   :LaTeX-fragments nil)))
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    (set-buffer buffer)
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    (erase-buffer)
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    (org-install-letbind)
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    (and (fboundp 'set-buffer-file-coding-system)
	 (set-buffer-file-coding-system coding-system-for-write))

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    ;; insert the header and initial document commands
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    (unless (or (eq to-buffer 'string) body-only)
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      (insert header))
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    ;; insert text found in #+TEXT
    (when (and text (not (eq to-buffer 'string)))
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      (insert (org-export-latex-content
	       text '(lists tables fixed-width keywords))
	       "\n\n"))
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    ;; insert lines before the first headline
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    (unless skip
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      (insert first-lines))
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    ;; export the content of headlines
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    (org-export-latex-global
     (with-temp-buffer
       (insert string-for-export)
       (goto-char (point-min))
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       (when (re-search-forward "^\\(\\*+\\) " nil t)
	 (let* ((asters (length (match-string 1)))
		(level (if odd (- asters 2) (- asters 1))))
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	   (setq org-export-latex-add-level
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		 (if odd (1- (/ (1+ asters) 2)) (1- asters)))
	   (org-export-latex-parse-global level odd)))))

    ;; finalization
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    (unless body-only (insert "\n\\end{document}"))
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    ;; Attach description terms to the \item macro
    (goto-char (point-min))
    (while (re-search-forward "^[ \t]*\\\\item\\([ \t]+\\)\\[" nil t)
      (delete-region (match-beginning 1) (match-end 1)))

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    ;; Relocate the table of contents
    (goto-char (point-min))
    (when (re-search-forward "\\[TABLE-OF-CONTENTS\\]" nil t)
      (goto-char (point-min))
      (while (re-search-forward "\\\\tableofcontents\\>[ \t]*\n?" nil t)
	(replace-match ""))
      (goto-char (point-min))
      (and (re-search-forward "\\[TABLE-OF-CONTENTS\\]" nil t)
	   (replace-match "\\tableofcontents" t t)))

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    ;; Cleanup forced line ends in items where they are not needed
    (goto-char (point-min))
    (while (re-search-forward
	    "^[ \t]*\\\\item\\>.*\\(\\\\\\\\\\)[ \t]*\\(\n\\\\label.*\\)*\n\\\\begin"
	    nil t)
      (delete-region (match-beginning 1) (match-end 1)))
    (goto-char (point-min))
    (while (re-search-forward
	    "^[ \t]*\\\\item\\>.*\\(\\\\\\\\\\)[ \t]*\\(\n\\\\label.*\\)*"
	    nil t)
      (if (looking-at "[\n \t]+")
	  (replace-match "\n")))

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    (run-hooks 'org-export-latex-final-hook)
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    (if to-buffer
	(unless (eq major-mode 'latex-mode) (latex-mode))
      (save-buffer))
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    (org-export-latex-fix-inputenc)
    (run-hooks 'org-export-latex-after-save-hook)
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    (goto-char (point-min))
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    (or (org-export-push-to-kill-ring "LaTeX")
	(message "Exporting to LaTeX...done"))
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    (prog1
	(if (eq to-buffer 'string)
	    (prog1 (buffer-substring (point-min) (point-max))
	      (kill-buffer (current-buffer)))
	  (current-buffer))
      (set-window-configuration wcf))))

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;;;###autoload
(defun org-export-as-pdf (arg &optional hidden ext-plist
			      to-buffer body-only pub-dir)
  "Export as LaTeX, then process through to PDF."
  (interactive "P")
  (message "Exporting to PDF...")
  (let* ((wconfig (current-window-configuration))
	 (lbuf (org-export-as-latex arg hidden ext-plist
				    to-buffer body-only pub-dir))
	 (file (buffer-file-name lbuf))
	 (base (file-name-sans-extension (buffer-file-name lbuf)))
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	 (pdffile (concat base ".pdf"))
	 (cmds org-latex-to-pdf-process)
	 (outbuf (get-buffer-create "*Org PDF LaTeX Output*"))
	 (bibtex-p (with-current-buffer lbuf
		     (save-excursion
		       (goto-char (point-min))
		       (re-search-forward "\\\\bibliography{" nil t))))
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	 cmd output-dir errors)
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    (with-current-buffer outbuf (erase-buffer))
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    (message (concat "Processing LaTeX file " file "..."))
    (setq output-dir (file-name-directory file))
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    (if (and cmds (symbolp cmds))
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	(funcall cmds (shell-quote-argument file))
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      (while cmds
	(setq cmd (pop cmds))
	(while (string-match "%b" cmd)
	  (setq cmd (replace-match
		     (save-match-data
		       (shell-quote-argument base))
		     t t cmd)))
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	(while (string-match "%f" cmd)
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	  (setq cmd (replace-match
		     (save-match-data
		       (shell-quote-argument file))
		     t t cmd)))
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	(while (string-match "%o" cmd)
	  (setq cmd (replace-match
		     (save-match-data
		       (shell-quote-argument output-dir))
		     t t cmd)))
	(shell-command cmd outbuf)))
    (message (concat "Processing LaTeX file " file "...done"))
    (setq errors (org-export-latex-get-error outbuf))
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    (if (not (file-exists-p pdffile))
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	(error (concat "PDF file " pdffile " was not produced"
		       (if errors (concat ":" errors "") "")))
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      (set-window-configuration wconfig)
      (when org-export-pdf-remove-logfiles
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	(dolist (ext org-export-pdf-logfiles)
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	  (setq file (concat base "." ext))
	  (and (file-exists-p file) (delete-file file))))
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      (message (concat
		"Exporting to PDF...done"
		(if errors
		    (concat ", with some errors:" errors)
		  "")))
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      pdffile)))

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(defun org-export-latex-get-error (buf)
  "Collect the kinds of errors that remain in pdflatex processing."
  (with-current-buffer buf
    (save-excursion
      (goto-char (point-max))
      (when (re-search-backward "^[ \t]*This is pdf.*?TeX.*?Version" nil t)
	;; OK, we are at the location of the final run
	(let ((pos (point)) (errors "") (case-fold-search t))
	  (if (re-search-forward "Reference.*?undefined" nil t)
	      (setq errors (concat errors " [undefined reference]")))
	  (goto-char pos)
	  (if (re-search-forward "Citation.*?undefined" nil t)
	      (setq errors (concat errors " [undefined citation]")))
	  (goto-char pos)
	  (if (re-search-forward "Undefined control sequence" nil t)
	      (setq errors (concat errors " [undefined control sequence]")))
	  (and (org-string-nw-p errors) errors))))))

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;;;###autoload
(defun org-export-as-pdf-and-open (arg)
  "Export as LaTeX, then process through to PDF, and open."
  (interactive "P")
  (let ((pdffile (org-export-as-pdf arg)))
    (if pdffile
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	(progn
	  (org-open-file pdffile)
	  (when org-export-kill-product-buffer-when-displayed
	    (kill-buffer (find-buffer-visiting
			  (concat (file-name-sans-extension (buffer-file-name))
				  ".tex")))))
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      (error "PDF file was not produced"))))

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;;; Parsing functions:
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(defun org-export-latex-parse-global (level odd)
  "Parse the current buffer recursively, starting at LEVEL.
If ODD is non-nil, assume the buffer only contains odd sections.
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Return a list reflecting the document structure."
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  (save-excursion
    (goto-char (point-min))
    (let* ((cnt 0) output
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	   (depth org-export-latex-sectioning-depth))
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      (while (org-re-search-forward-unprotected
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	      (concat "^\\(\\(?:\\*\\)\\{"
		      (number-to-string (+ (if odd 2 1) level))
		      "\\}\\) \\(.*\\)$")
	      ;; make sure that there is no upper heading
	      (when (> level 0)
		(save-excursion
		  (save-match-data
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		    (org-re-search-forward-unprotected
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		     (concat "^\\(\\(?:\\*\\)\\{"
			     (number-to-string level)
			     "\\}\\) \\(.*\\)$") nil t)))) t)
	(setq cnt (1+ cnt))
	(let* ((pos (match-beginning 0))
	       (heading (match-string 2))
	       (nlevel (if odd (/ (+ 3 level) 2) (1+ level))))
	  (save-excursion
	    (narrow-to-region
	     (point)
	     (save-match-data
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	       (if (org-re-search-forward-unprotected
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		    (concat "^\\(\\(?:\\*\\)\\{"
			    (number-to-string (+ (if odd 2 1) level))
			    "\\}\\) \\(.*\\)$") nil t)
		   (match-beginning 0)
		 (point-max))))
	    (goto-char (point-min))
	    (setq output
		  (append output
			  (list
			   (list
			    `(pos . ,pos)
			    `(level . ,nlevel)
			    `(occur . ,cnt)
			    `(heading . ,heading)
			    `(content . ,(org-export-latex-parse-content))
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			    `(subcontent . ,(org-export-latex-parse-subcontent
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					     level odd)))))))
	  (widen)))
      (list output))))

(defun org-export-latex-parse-content ()
  "Extract the content of a section."
  (let ((beg (point))
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	(end (if (org-re-search-forward-unprotected "^\\(\\*\\)+ .*$" nil t)
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		 (progn (beginning-of-line) (point))
	       (point-max))))
    (buffer-substring beg end)))

(defun org-export-latex-parse-subcontent (level odd)
  "Extract the subcontent of a section at LEVEL.
If ODD Is non-nil, assume subcontent only contains odd sections."
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  (if (not (org-re-search-forward-unprotected
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	    (concat "^\\(\\(?:\\*\\)\\{"
		    (number-to-string (+ (if odd 4 2) level))
		    "\\}\\) \\(.*\\)$")
	    nil t))
      nil ; subcontent is nil
    (org-export-latex-parse-global (+ (if odd 2 1) level) odd)))

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;;; Rendering functions:
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(defun org-export-latex-global (content)
  "Export CONTENT to LaTeX.
CONTENT is an element of the list produced by
`org-export-latex-parse-global'."
  (if (eq (car content) 'subcontent)
      (mapc 'org-export-latex-sub (cdr content))
    (org-export-latex-sub (car content))))

(defun org-export-latex-sub (subcontent)
  "Export the list SUBCONTENT to LaTeX.
SUBCONTENT is an alist containing information about the headline
and its content."
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  (let ((num (plist-get org-export-latex-options-plist :section-numbers)))
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    (mapc (lambda(x) (org-export-latex-subcontent x num)) subcontent)))
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(defun org-export-latex-subcontent (subcontent num)
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  "Export each cell of SUBCONTENT to LaTeX.
If NUM, export sections as numerical sections."
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  (let* ((heading (cdr (assoc 'heading subcontent)))
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	 (level (- (cdr (assoc 'level subcontent))
		   org-export-latex-add-level))
	 (occur (number-to-string (cdr (assoc 'occur subcontent))))
	 (content (cdr (assoc 'content subcontent)))
	 (subcontent (cadr (assoc 'subcontent subcontent)))
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	 (label (org-get-text-property-any 0 'target heading))
	 (label-list (cons label (cdr (assoc label
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