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+;;; ox-publish.el --- Publish Related Org Mode Files as a Website
+;; Copyright (C) 2006-2013 Free Software Foundation, Inc.
+
+;; Author: David O'Toole <dto@gnu.org>
+;; Maintainer: Carsten Dominik <carsten DOT dominik AT gmail DOT com>
+;; Keywords: hypermedia, outlines, 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:
+
+;; This program allow configurable publishing of related sets of
+;; Org mode files as a complete website.
+;;
+;; ox-publish.el can do the following:
+;;
+;; + Publish all one's Org files to a given export back-end
+;; + Upload HTML, images, attachments and other files to a web server
+;; + Exclude selected private pages from publishing
+;; + Publish a clickable sitemap of pages
+;; + Manage local timestamps for publishing only changed files
+;; + Accept plugin functions to extend range of publishable content
+;;
+;; Documentation for publishing is in the manual.
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+(require 'format-spec)
+(require 'ox)
+
+
+
+;;; Variables
+
+(defvar org-publish-temp-files nil
+  "Temporary list of files to be published.")
+
+;; Here, so you find the variable right before it's used the first time:
+(defvar org-publish-cache nil
+  "This will cache timestamps and titles for files in publishing projects.
+Blocks could hash sha1 values here.")
+
+(defgroup org-publish nil
+  "Options for publishing a set of Org-mode and related files."
+  :tag "Org Publishing"
+  :group 'org)
+
+(defcustom org-publish-project-alist nil
+  "Association list to control publishing behavior.
+Each element of the alist is a publishing 'project.'  The CAR of
+each element is a string, uniquely identifying the project.  The
+CDR of each element is in one of the following forms:
+
+1. A well-formed property list with an even number of elements,
+   alternating keys and values, specifying parameters for the
+   publishing process.
+
+     \(:property value :property value ... )
+
+2. A meta-project definition, specifying of a list of
+   sub-projects:
+
+     \(:components (\"project-1\" \"project-2\" ...))
+
+When the CDR of an element of org-publish-project-alist is in
+this second form, the elements of the list after `:components'
+are taken to be components of the project, which group together
+files requiring different publishing options.  When you publish
+such a project with \\[org-publish], the components all publish.
+
+When a property is given a value in `org-publish-project-alist',
+its setting overrides the value of the corresponding user
+variable (if any) during publishing.  However, options set within
+a file override everything.
+
+Most properties are optional, but some should always be set:
+
+  `:base-directory'
+
+    Directory containing publishing source files.
+
+  `:base-extension'
+
+    Extension (without the dot!) of source files.  This can be
+    a regular expression.  If not given, \"org\" will be used as
+    default extension.
+
+  `:publishing-directory'
+
+    Directory (possibly remote) where output files will be
+    published.
+
+The `:exclude' property may be used to prevent certain files from
+being published.  Its value may be a string or regexp matching
+file names you don't want to be published.
+
+The `:include' property may be used to include extra files.  Its
+value may be a list of filenames to include.  The filenames are
+considered relative to the base directory.
+
+When both `:include' and `:exclude' properties are given values,
+the exclusion step happens first.
+
+One special property controls which back-end function to use for
+publishing files in the project.  This can be used to extend the
+set of file types publishable by `org-publish', as well as the
+set of output formats.
+
+  `:publishing-function'
+
+    Function to publish file.  Each back-end may define its
+    own (i.e. `org-latex-publish-to-pdf',
+    `org-html-publish-to-html').  May be a list of functions, in
+    which case each function in the list is invoked in turn.
+
+Another property allows you to insert code that prepares
+a project for publishing.  For example, you could call GNU Make
+on a certain makefile, to ensure published files are built up to
+date.
+
+  `:preparation-function'
+
+    Function to be called before publishing this project.  This
+    may also be a list of functions.
+
+  `:completion-function'
+
+    Function to be called after publishing this project.  This
+    may also be a list of functions.
+
+Some properties control details of the Org publishing process,
+and are equivalent to the corresponding user variables listed in
+the right column.  Back-end specific properties may also be
+included.  See the back-end documentation for more information.
+
+  :author                   `user-full-name'
+  :creator                  `org-export-creator-string'
+  :email                    `user-mail-address'
+  :exclude-tags             `org-export-exclude-tags'
+  :headline-levels          `org-export-headline-levels'
+  :language                 `org-export-default-language'
+  :preserve-breaks          `org-export-preserve-breaks'
+  :section-numbers          `org-export-with-section-numbers'
+  :select-tags              `org-export-select-tags'
+  :time-stamp-file          `org-export-time-stamp-file'
+  :with-archived-trees      `org-export-with-archived-trees'
+  :with-author              `org-export-with-author'
+  :with-creator             `org-export-with-creator'
+  :with-date                `org-export-with-date'
+  :with-drawers             `org-export-with-drawers'
+  :with-email               `org-export-with-email'
+  :with-emphasize           `org-export-with-emphasize'
+  :with-entities            `org-export-with-entities'
+  :with-fixed-width         `org-export-with-fixed-width'
+  :with-footnotes           `org-export-with-footnotes'
+  :with-inlinetasks         `org-export-with-inlinetasks'
+  :with-latex               `org-export-with-latex'
+  :with-priority            `org-export-with-priority'
+  :with-smart-quotes        `org-export-with-smart-quotes'
+  :with-special-strings     `org-export-with-special-strings'
+  :with-statistics-cookies' `org-export-with-statistics-cookies'
+  :with-sub-superscript     `org-export-with-sub-superscripts'
+  :with-toc                 `org-export-with-toc'
+  :with-tables              `org-export-with-tables'
+  :with-tags                `org-export-with-tags'
+  :with-tasks               `org-export-with-tasks'
+  :with-timestamps          `org-export-with-timestamps'
+  :with-planning            `org-export-with-planning'
+  :with-todo-keywords       `org-export-with-todo-keywords'
+
+The following properties may be used to control publishing of
+a site-map of files or summary page for a given project.
+
+  `:auto-sitemap'
+
+    Whether to publish a site-map during
+    `org-publish-current-project' or `org-publish-all'.
+
+  `:sitemap-filename'
+
+    Filename for output of sitemap.  Defaults to \"sitemap.org\".
+
+  `:sitemap-title'
+
+    Title of site-map page.  Defaults to name of file.
+
+  `:sitemap-function'
+
+    Plugin function to use for generation of site-map.  Defaults
+    to `org-publish-org-sitemap', which generates a plain list of
+    links to all files in the project.
+
+  `:sitemap-style'
+
+    Can be `list' (site-map is just an itemized list of the
+    titles of the files involved) or `tree' (the directory
+    structure of the source files is reflected in the site-map).
+    Defaults to `tree'.
+
+  `:sitemap-sans-extension'
+
+    Remove extension from site-map's file-names.  Useful to have
+    cool URIs (see http://www.w3.org/Provider/Style/URI).
+    Defaults to nil.
+
+If you create a site-map file, adjust the sorting like this:
+
+  `:sitemap-sort-folders'
+
+    Where folders should appear in the site-map.  Set this to
+    `first' (default) or `last' to display folders first or last,
+    respectively.  Any other value will mix files and folders.
+
+  `:sitemap-sort-files'
+
+    The site map is normally sorted alphabetically.  You can
+    change this behaviour setting this to `anti-chronologically',
+    `chronologically', or nil.
+
+  `:sitemap-ignore-case'
+
+    Should sorting be case-sensitive?  Default nil.
+
+The following property control the creation of a concept index.
+
+  `:makeindex'
+
+    Create a concept index.  The file containing the index has to
+    be called \"theindex.org\".  If it doesn't exist in the
+    project, it will be generated.  Contents of the index are
+    stored in the file \"theindex.inc\", which can be included in
+    \"theindex.org\".
+
+Other properties affecting publication.
+
+  `:body-only'
+
+    Set this to t to publish only the body of the documents."
+  :group 'org-export-publish
+  :type 'alist)
+
+(defcustom org-publish-use-timestamps-flag t
+  "Non-nil means use timestamp checking to publish only changed files.
+When nil, do no timestamp checking and always publish all files."
+  :group 'org-export-publish
+  :type 'boolean)
+
+(defcustom org-publish-timestamp-directory
+  (convert-standard-filename "~/.org-timestamps/")
+  "Name of directory in which to store publishing timestamps."
+  :group 'org-export-publish
+  :type 'directory)
+
+(defcustom org-publish-list-skipped-files t
+  "Non-nil means show message about files *not* published."
+  :group 'org-export-publish
+  :type 'boolean)
+
+(defcustom org-publish-sitemap-sort-files 'alphabetically
+  "Method to sort files in site-maps.
+Possible values are `alphabetically', `chronologically',
+`anti-chronologically' and nil.
+
+If `alphabetically', files will be sorted alphabetically.  If
+`chronologically', files will be sorted with older modification
+time first.  If `anti-chronologically', files will be sorted with
+newer modification time first.  nil won't sort files.
+
+You can overwrite this default per project in your
+`org-publish-project-alist', using `:sitemap-sort-files'."
+  :group 'org-export-publish
+  :type 'symbol)
+
+(defcustom org-publish-sitemap-sort-folders 'first
+  "A symbol, denoting if folders are sorted first in sitemaps.
+Possible values are `first', `last', and nil.
+If `first', folders will be sorted before files.
+If `last', folders are sorted to the end after the files.
+Any other value will not mix files and folders.
+
+You can overwrite this default per project in your
+`org-publish-project-alist', using `:sitemap-sort-folders'."
+  :group 'org-export-publish
+  :type 'symbol)
+
+(defcustom org-publish-sitemap-sort-ignore-case nil
+  "Non-nil when site-map sorting should ignore case.
+
+You can overwrite this default per project in your
+`org-publish-project-alist', using `:sitemap-ignore-case'."
+  :group 'org-export-publish
+  :type 'boolean)
+
+(defcustom org-publish-sitemap-date-format "%Y-%m-%d"
+  "Format for printing a date in the sitemap.
+See `format-time-string' for allowed formatters."
+  :group 'org-export-publish
+  :type 'string)
+
+(defcustom org-publish-sitemap-file-entry-format "%t"
+  "Format string for site-map file entry.
+You could use brackets to delimit on what part the link will be.
+
+%t is the title.
+%a is the author.
+%d is the date formatted using `org-publish-sitemap-date-format'."
+  :group 'org-export-publish
+  :type 'string)
+
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Timestamp-related functions
+
+(defun org-publish-timestamp-filename (filename &optional pub-dir pub-func)
+  "Return path to timestamp file for filename FILENAME."
+  (setq filename (concat filename "::" (or pub-dir "") "::"
+			 (format "%s" (or pub-func ""))))
+  (concat "X" (if (fboundp 'sha1) (sha1 filename) (md5 filename))))
+
+(defun org-publish-needed-p
+  (filename &optional pub-dir pub-func true-pub-dir base-dir)
+  "Non-nil if FILENAME should be published in PUB-DIR using PUB-FUNC.
+TRUE-PUB-DIR is where the file will truly end up.  Currently we
+are not using this - maybe it can eventually be used to check if
+the file is present at the target location, and how old it is.
+Right now we cannot do this, because we do not know under what
+file name the file will be stored - the publishing function can
+still decide about that independently."
+  (let ((rtn (if (not org-publish-use-timestamps-flag) t
+	       (org-publish-cache-file-needs-publishing
+		filename pub-dir pub-func base-dir))))
+    (if rtn (message "Publishing file %s using `%s'" filename pub-func)
+      (when org-publish-list-skipped-files
+	(message   "Skipping unmodified file %s" filename)))
+    rtn))
+
+(defun org-publish-update-timestamp
+  (filename &optional pub-dir pub-func base-dir)
+  "Update publishing timestamp for file FILENAME.
+If there is no timestamp, create one."
+  (let ((key (org-publish-timestamp-filename filename pub-dir pub-func))
+	(stamp (org-publish-cache-ctime-of-src filename)))
+    (org-publish-cache-set key stamp)))
+
+(defun org-publish-remove-all-timestamps ()
+  "Remove all files in the timestamp directory."
+  (let ((dir org-publish-timestamp-directory)
+	files)
+    (when (and (file-exists-p dir) (file-directory-p dir))
+      (mapc 'delete-file (directory-files dir 'full "[^.]\\'"))
+      (org-publish-reset-cache))))
+
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Getting project information out of `org-publish-project-alist'
+
+(defun org-publish-expand-projects (projects-alist)
+  "Expand projects in PROJECTS-ALIST.
+This splices all the components into the list."
+  (let ((rest projects-alist) rtn p components)
+    (while (setq p (pop rest))
+      (if (setq components (plist-get (cdr p) :components))
+	  (setq rest (append
+		      (mapcar (lambda (x) (assoc x org-publish-project-alist))
+			      components)
+		      rest))
+	(push p rtn)))
+    (nreverse (delete-dups (delq nil rtn)))))
+
+(defvar org-sitemap-sort-files)
+(defvar org-sitemap-sort-folders)
+(defvar org-sitemap-ignore-case)
+(defvar org-sitemap-requested)
+(defvar org-sitemap-date-format)
+(defvar org-sitemap-file-entry-format)
+(defun org-publish-compare-directory-files (a b)
+  "Predicate for `sort', that sorts folders and files for sitemap."
+  (let ((retval t))
+    (when (or org-sitemap-sort-files org-sitemap-sort-folders)
+      ;; First we sort files:
+      (when org-sitemap-sort-files
+	(case org-sitemap-sort-files
+	  (alphabetically
+	   (let* ((adir (file-directory-p a))
+		  (aorg (and (string-match "\\.org$" a) (not adir)))
+		  (bdir (file-directory-p b))
+		  (borg (and (string-match "\\.org$" b) (not bdir)))
+		  (A (if aorg (concat (file-name-directory a)
+				      (org-publish-find-title a)) a))
+		  (B (if borg (concat (file-name-directory b)
+				      (org-publish-find-title b)) b)))
+	     (setq retval (if org-sitemap-ignore-case
+			      (not (string-lessp (upcase B) (upcase A)))
+			    (not (string-lessp B A))))))
+	  ((anti-chronologically chronologically)
+	   (let* ((adate (org-publish-find-date a))
+		  (bdate (org-publish-find-date b))
+		  (A (+ (lsh (car adate) 16) (cadr adate)))
+		  (B (+ (lsh (car bdate) 16) (cadr bdate))))
+	     (setq retval
+		   (if (eq org-sitemap-sort-files 'chronologically) (<= A B)
+		     (>= A B)))))))
+      ;; Directory-wise wins:
+      (when org-sitemap-sort-folders
+        ;; a is directory, b not:
+        (cond
+         ((and (file-directory-p a) (not (file-directory-p b)))
+          (setq retval (equal org-sitemap-sort-folders 'first)))
+	 ;; a is not a directory, but b is:
+         ((and (not (file-directory-p a)) (file-directory-p b))
+          (setq retval (equal org-sitemap-sort-folders 'last))))))
+    retval))
+
+(defun org-publish-get-base-files-1
+  (base-dir &optional recurse match skip-file skip-dir)
+  "Set `org-publish-temp-files' with files from BASE-DIR directory.
+If RECURSE is non-nil, check BASE-DIR recursively.  If MATCH is
+non-nil, restrict this list to the files matching the regexp
+MATCH.  If SKIP-FILE is non-nil, skip file matching the regexp
+SKIP-FILE.  If SKIP-DIR is non-nil, don't check directories
+matching the regexp SKIP-DIR when recursing through BASE-DIR."
+  (mapc (lambda (f)
+	  (let ((fd-p (file-directory-p f))
+		(fnd (file-name-nondirectory f)))
+	    (if (and fd-p recurse
+		     (not (string-match "^\\.+$" fnd))
+		     (if skip-dir (not (string-match skip-dir fnd)) t))
+		(org-publish-get-base-files-1
+		 f recurse match skip-file skip-dir)
+	      (unless (or fd-p ;; this is a directory
+			  (and skip-file (string-match skip-file fnd))
+			  (not (file-exists-p (file-truename f)))
+			  (not (string-match match fnd)))
+
+		(pushnew f org-publish-temp-files)))))
+	(let ((all-files (if (not recurse) (directory-files base-dir t match)
+			   ;; If RECURSE is non-nil, we want all files
+			   ;; matching MATCH and sub-directories.
+			   (org-remove-if-not
+			    (lambda (file)
+			      (or (file-directory-p file)
+				  (and match (string-match match file))))
+			    (directory-files base-dir t)))))
+	  (if (not org-sitemap-requested) all-files
+	    (sort all-files 'org-publish-compare-directory-files)))))
+
+(defun org-publish-get-base-files (project &optional exclude-regexp)
+  "Return a list of all files in PROJECT.
+If EXCLUDE-REGEXP is set, this will be used to filter out
+matching filenames."
+  (let* ((project-plist (cdr project))
+	 (base-dir (file-name-as-directory
+		    (plist-get project-plist :base-directory)))
+	 (include-list (plist-get project-plist :include))
+	 (recurse (plist-get project-plist :recursive))
+	 (extension (or (plist-get project-plist :base-extension) "org"))
+	 ;; sitemap-... variables are dynamically scoped for
+	 ;; org-publish-compare-directory-files:
+	 (org-sitemap-requested
+	  (plist-get project-plist :auto-sitemap))
+	 (sitemap-filename
+	  (or (plist-get project-plist :sitemap-filename) "sitemap.org"))
+	 (org-sitemap-sort-folders
+	  (if (plist-member project-plist :sitemap-sort-folders)
+	      (plist-get project-plist :sitemap-sort-folders)
+	    org-publish-sitemap-sort-folders))
+	 (org-sitemap-sort-files
+	  (cond ((plist-member project-plist :sitemap-sort-files)
+		 (plist-get project-plist :sitemap-sort-files))
+		;; For backward compatibility:
+		((plist-member project-plist :sitemap-alphabetically)
+		 (if (plist-get project-plist :sitemap-alphabetically)
+		     'alphabetically nil))
+		(t org-publish-sitemap-sort-files)))
+	 (org-sitemap-ignore-case
+	  (if (plist-member project-plist :sitemap-ignore-case)
+	      (plist-get project-plist :sitemap-ignore-case)
+	    org-publish-sitemap-sort-ignore-case))
+	 (match (if (eq extension 'any) "^[^\\.]"
+		  (concat "^[^\\.].*\\.\\(" extension "\\)$"))))
+    ;; Make sure `org-sitemap-sort-folders' has an accepted value
+    (unless (memq org-sitemap-sort-folders '(first last))
+      (setq org-sitemap-sort-folders nil))
+
+    (setq org-publish-temp-files nil)
+    (if org-sitemap-requested
+	(pushnew (expand-file-name (concat base-dir sitemap-filename))
+		  org-publish-temp-files))
+    (org-publish-get-base-files-1 base-dir recurse match
+				  ;; FIXME distinguish exclude regexp
+				  ;; for skip-file and skip-dir?
+				  exclude-regexp exclude-regexp)
+    (mapc (lambda (f)
+	    (pushnew
+	     (expand-file-name (concat base-dir f))
+	     org-publish-temp-files))
+	  include-list)
+    org-publish-temp-files))
+
+(defun org-publish-get-project-from-filename (filename &optional up)
+  "Return the project that FILENAME belongs to."
+  (let* ((filename (expand-file-name filename))
+	 project-name)
+
+    (catch 'p-found
+      (dolist (prj org-publish-project-alist)
+	(unless (plist-get (cdr prj) :components)
+	  ;; [[info:org:Selecting%20files]] shows how this is supposed to work:
+	  (let* ((r (plist-get (cdr prj) :recursive))
+		 (b (expand-file-name (file-name-as-directory
+				       (plist-get (cdr prj) :base-directory))))
+		 (x (or (plist-get (cdr prj) :base-extension) "org"))
+		 (e (plist-get (cdr prj) :exclude))
+		 (i (plist-get (cdr prj) :include))
+		 (xm (concat "^" b (if r ".+" "[^/]+") "\\.\\(" x "\\)$")))
+	    (when
+		(or (and i
+			 (member filename
+				 (mapcar (lambda (file)
+					   (expand-file-name file b))
+					 i)))
+		    (and (not (and e (string-match e filename)))
+			 (string-match xm filename)))
+	      (setq project-name (car prj))
+	      (throw 'p-found project-name))))))
+    (when up
+      (dolist (prj org-publish-project-alist)
+	(if (member project-name (plist-get (cdr prj) :components))
+	    (setq project-name (car prj)))))
+    (assoc project-name org-publish-project-alist)))
+
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Tools for publishing functions in back-ends
+
+(defun org-publish-org-to (backend filename extension plist &optional pub-dir)
+  "Publish an Org file to a specified back-end.
+
+BACKEND is a symbol representing the back-end used for
+transcoding.  FILENAME is the filename of the Org file to be
+published.  EXTENSION is the extension used for the output
+string, with the leading dot.  PLIST is the property list for the
+given project.
+
+Optional argument PUB-DIR, when non-nil is the publishing
+directory.
+
+Return output file name."
+  (unless (or (not pub-dir) (file-exists-p pub-dir)) (make-directory pub-dir t))
+  ;; Check if a buffer visiting FILENAME is already open.
+  (let* ((org-inhibit-startup t)
+	 (visitingp (find-buffer-visiting filename))
+	 (work-buffer (or visitingp (find-file-noselect filename))))
+    (prog1 (with-current-buffer work-buffer
+	     (let ((output-file
+		    (org-export-output-file-name extension nil pub-dir))
+		   (body-p (plist-get plist :body-only)))
+	       (org-export-to-file
+		backend output-file nil nil body-p
+		;; Add `org-publish-collect-numbering' and
+		;; `org-publish-collect-index' to final output
+		;; filters.  The latter isn't dependent on
+		;; `:makeindex', since we want to keep it up-to-date
+		;; in cache anyway.
+		(org-combine-plists
+		 plist
+		 `(:filter-final-output
+		   ,(cons 'org-publish-collect-numbering
+			  (cons 'org-publish-collect-index
+				(plist-get plist :filter-final-output))))))))
+      ;; Remove opened buffer in the process.
+      (unless visitingp (kill-buffer work-buffer)))))
+
+(defvar project-plist)
+
+(defun org-publish-attachment (plist filename pub-dir)
+  "Publish a file with no transformation of any kind.
+
+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."
+  (unless (file-directory-p pub-dir)
+    (make-directory pub-dir t))
+  (or (equal (expand-file-name (file-name-directory filename))
+	     (file-name-as-directory (expand-file-name pub-dir)))
+      (copy-file filename
+		 (expand-file-name (file-name-nondirectory filename) pub-dir)
+		 t)))
+
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Publishing files, sets of files, and indices
+
+(defun org-publish-file (filename &optional project no-cache)
+  "Publish file FILENAME from PROJECT.
+If NO-CACHE is not nil, do not initialize org-publish-cache and
+write it to disk.  This is needed, since this function is used to
+publish single files, when entire projects are published.
+See `org-publish-projects'."
+  (let* ((project
+	  (or project
+	      (or (org-publish-get-project-from-filename filename)
+		  (error "File %s not part of any known project"
+			 (abbreviate-file-name filename)))))
+	 (project-plist (cdr project))
+	 (ftname (expand-file-name filename))
+	 (publishing-function
+	  (or (plist-get project-plist :publishing-function)
+	      (error "No publishing function chosen")))
+	 (base-dir
+	  (file-name-as-directory
+	   (expand-file-name
+	    (or (plist-get project-plist :base-directory)
+		(error "Project %s does not have :base-directory defined"
+		       (car project))))))
+	 (pub-dir
+	  (file-name-as-directory
+	   (file-truename
+	    (or (eval (plist-get project-plist :publishing-directory))
+		(error "Project %s does not have :publishing-directory defined"
+		       (car project))))))
+	 tmp-pub-dir)
+
+    (unless no-cache (org-publish-initialize-cache (car project)))
+
+    (setq tmp-pub-dir
+	  (file-name-directory
+	   (concat pub-dir
+		   (and (string-match (regexp-quote base-dir) ftname)
+			(substring ftname (match-end 0))))))
+    (if (listp publishing-function)
+	;; allow chain of publishing functions
+	(mapc (lambda (f)
+		(when (org-publish-needed-p
+		       filename pub-dir f tmp-pub-dir base-dir)
+		  (funcall f project-plist filename tmp-pub-dir)
+		  (org-publish-update-timestamp filename pub-dir f base-dir)))
+	      publishing-function)
+      (when (org-publish-needed-p
+	     filename pub-dir publishing-function tmp-pub-dir base-dir)
+	(funcall publishing-function project-plist filename tmp-pub-dir)
+	(org-publish-update-timestamp
+	 filename pub-dir publishing-function base-dir)))
+    (unless no-cache (org-publish-write-cache-file))))
+
+(defun org-publish-projects (projects)
+  "Publish all files belonging to the PROJECTS alist.
+If `:auto-sitemap' is set, publish the sitemap too.  If
+`:makeindex' is set, also produce a file theindex.org."
+  (mapc
+   (lambda (project)
+     ;; Each project uses its own cache file:
+     (org-publish-initialize-cache (car project))
+     (let* ((project-plist (cdr project))
+	    (exclude-regexp (plist-get project-plist :exclude))
+	    (sitemap-p (plist-get project-plist :auto-sitemap))
+	    (sitemap-filename (or (plist-get project-plist :sitemap-filename)
+				  "sitemap.org"))
+	    (sitemap-function (or (plist-get project-plist :sitemap-function)
+				  'org-publish-org-sitemap))
+	    (org-sitemap-date-format
+	     (or (plist-get project-plist :sitemap-date-format)
+		 org-publish-sitemap-date-format))
+	    (org-sitemap-file-entry-format
+	     (or (plist-get project-plist :sitemap-file-entry-format)
+		 org-publish-sitemap-file-entry-format))
+	    (preparation-function
+	     (plist-get project-plist :preparation-function))
+	    (completion-function (plist-get project-plist :completion-function))
+	    (files (org-publish-get-base-files project exclude-regexp))
+	    (theindex
+	     (expand-file-name "theindex.org"
+			       (plist-get project-plist :base-directory))))
+       (when preparation-function (run-hooks 'preparation-function))
+       (if sitemap-p (funcall sitemap-function project sitemap-filename))
+       ;; Publish all files from PROJECT excepted "theindex.org".  Its
+       ;; publishing will be deferred until "theindex.inc" is
+       ;; populated.
+       (dolist (file files)
+	 (unless (equal file theindex)
+	   (org-publish-file file project t)))
+       ;; Populate "theindex.inc", if needed, and publish
+       ;; "theindex.org".
+       (when (plist-get project-plist :makeindex)
+	 (org-publish-index-generate-theindex
+	  project (plist-get project-plist :base-directory))
+	 (org-publish-file theindex project t))
+       (when completion-function (run-hooks 'completion-function))
+       (org-publish-write-cache-file)))
+   (org-publish-expand-projects projects)))
+
+(defun org-publish-org-sitemap (project &optional sitemap-filename)
+  "Create a sitemap of pages in set defined by PROJECT.
+Optionally set the filename of the sitemap with SITEMAP-FILENAME.
+Default for SITEMAP-FILENAME is 'sitemap.org'."
+  (let* ((project-plist (cdr project))
+	 (dir (file-name-as-directory
+	       (plist-get project-plist :base-directory)))
+	 (localdir (file-name-directory dir))
+	 (indent-str (make-string 2 ?\ ))
+	 (exclude-regexp (plist-get project-plist :exclude))
+	 (files (nreverse
+		 (org-publish-get-base-files project exclude-regexp)))
+	 (sitemap-filename (concat dir (or sitemap-filename "sitemap.org")))
+	 (sitemap-title (or (plist-get project-plist :sitemap-title)
+			  (concat "Sitemap for project " (car project))))
+	 (sitemap-style (or (plist-get project-plist :sitemap-style)
+			    'tree))
+	 (sitemap-sans-extension
+	  (plist-get project-plist :sitemap-sans-extension))
+	 (visiting (find-buffer-visiting sitemap-filename))
+	 (ifn (file-name-nondirectory sitemap-filename))
+	 file sitemap-buffer)
+    (with-current-buffer
+	(let ((org-inhibit-startup t))
+	  (setq sitemap-buffer
+		(or visiting (find-file sitemap-filename))))
+      (erase-buffer)
+      (insert (concat "#+TITLE: " sitemap-title "\n\n"))
+      (while (setq file (pop files))
+	(let ((fn (file-name-nondirectory file))
+	      (link (file-relative-name file dir))
+	      (oldlocal localdir))
+	  (when sitemap-sans-extension
+	    (setq link (file-name-sans-extension link)))
+	  ;; sitemap shouldn't list itself
+	  (unless (equal (file-truename sitemap-filename)
+			 (file-truename file))
+	    (if (eq sitemap-style 'list)
+		(message "Generating list-style sitemap for %s" sitemap-title)
+	      (message "Generating tree-style sitemap for %s" sitemap-title)
+	      (setq localdir (concat (file-name-as-directory dir)
+				     (file-name-directory link)))
+	      (unless (string= localdir oldlocal)
+		(if (string= localdir dir)
+		    (setq indent-str (make-string 2 ?\ ))
+		  (let ((subdirs
+			 (split-string
+			  (directory-file-name
+			   (file-name-directory
+			    (file-relative-name localdir dir))) "/"))
+			(subdir "")
+			(old-subdirs (split-string
+				      (file-relative-name oldlocal dir) "/")))
+		    (setq indent-str (make-string 2 ?\ ))
+		    (while (string= (car old-subdirs) (car subdirs))
+		      (setq indent-str (concat indent-str (make-string 2 ?\ )))
+		      (pop old-subdirs)
+		      (pop subdirs))
+		    (dolist (d subdirs)
+		      (setq subdir (concat subdir d "/"))
+		      (insert (concat indent-str " + " d "\n"))
+		      (setq indent-str (make-string
+					(+ (length indent-str) 2) ?\ )))))))
+	    ;; This is common to 'flat and 'tree
+	    (let ((entry
+		   (org-publish-format-file-entry
+		    org-sitemap-file-entry-format file project-plist))
+		  (regexp "\\(.*\\)\\[\\([^][]+\\)\\]\\(.*\\)"))
+	      (cond ((string-match-p regexp entry)
+		     (string-match regexp entry)
+		     (insert (concat indent-str " + " (match-string 1 entry)
+				     "[[file:" link "]["
+				     (match-string 2 entry)
+				     "]]" (match-string 3 entry) "\n")))
+		    (t
+		     (insert (concat indent-str " + [[file:" link "]["
+				     entry
+				     "]]\n"))))))))
+      (save-buffer))
+    (or visiting (kill-buffer sitemap-buffer))))
+
+(defun org-publish-format-file-entry (fmt file project-plist)
+  (format-spec fmt
+	     `((?t . ,(org-publish-find-title file t))
+	       (?d . ,(format-time-string org-sitemap-date-format
+					  (org-publish-find-date file)))
+	       (?a . ,(or (plist-get project-plist :author) user-full-name)))))
+
+(defun org-publish-find-title (file &optional reset)
+  "Find the title of FILE in project."
+  (or
+   (and (not reset) (org-publish-cache-get-file-property file :title nil t))
+   (let* ((org-inhibit-startup t)
+	  (visiting (find-buffer-visiting file))
+	  (buffer (or visiting (find-file-noselect file)))
+	  title)
+     (with-current-buffer buffer
+       (org-mode)
+       (setq title
+	     (or (org-element-interpret-data
+		  (plist-get (org-export-get-environment) :title))
+		 (file-name-nondirectory (file-name-sans-extension file)))))
+     (unless visiting (kill-buffer buffer))
+     (org-publish-cache-set-file-property file :title title)
+     title)))
+
+(defun org-publish-find-date (file)
+  "Find the date of FILE in project.
+This function assumes FILE is either a directory or an Org file.
+If FILE is an Org file and provides a DATE keyword use it.  In
+any other case use the file system's modification time.  Return
+time in `current-time' format."
+  (if (file-directory-p file) (nth 5 (file-attributes file))
+    (let* ((visiting (find-buffer-visiting file))
+	   (file-buf (or visiting (find-file-noselect file nil)))
+	   (date (plist-get
+		  (with-current-buffer file-buf
+		    (let ((org-inhibit-startup t)) (org-mode))
+		    (org-export-get-environment))
+		  :date)))
+      (unless visiting (kill-buffer file-buf))
+      ;; DATE is either a timestamp object or a secondary string.  If it
+      ;; is a timestamp or if the secondary string contains a timestamp,
+      ;; convert it to internal format.  Otherwise, use FILE
+      ;; modification time.
+      (cond ((eq (org-element-type date) 'timestamp)
+	     (org-time-string-to-time (org-element-interpret-data date)))
+	    ((let ((ts (and (consp date) (assq 'timestamp date))))
+	       (and ts
+		    (let ((value (org-element-interpret-data ts)))
+		      (and (org-string-nw-p value)
+			   (org-time-string-to-time value))))))
+	    ((file-exists-p file) (nth 5 (file-attributes file)))
+	    (t (error "No such file: \"%s\"" file))))))
+
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Interactive publishing functions
+
+;;;###autoload
+(defalias 'org-publish-project 'org-publish)
+
+;;;###autoload
+(defun org-publish (project &optional force async)
+  "Publish PROJECT.
+
+PROJECT is either a project name, as a string, or a project
+alist (see `org-publish-project-alist' variable).
+
+When optional argument FORCE is non-nil, force publishing all
+files in PROJECT.  With a non-nil optional argument ASYNC,
+publishing will be done asynchronously, in another process."
+  (interactive
+   (list
+    (assoc (org-icompleting-read
+	    "Publish project: "
+	    org-publish-project-alist nil t)
+	   org-publish-project-alist)
+    current-prefix-arg))
+  (let ((project-alist  (if (not (stringp project)) (list project)
+			  ;; If this function is called in batch mode,
+			  ;; project is still a string here.
+			  (list (assoc project org-publish-project-alist)))))
+    (if async
+	(org-export-async-start 'ignore
+	  `(let ((org-publish-use-timestamps-flag
+		  (if ',force nil ,org-publish-use-timestamps-flag)))
+	     (org-publish-projects ',project-alist)))
+      (save-window-excursion
+	(let* ((org-publish-use-timestamps-flag
+		(if force nil org-publish-use-timestamps-flag)))
+	  (org-publish-projects project-alist))))))
+
+;;;###autoload
+(defun org-publish-all (&optional force async)
+  "Publish all projects.
+With prefix argument FORCE, remove all files in the timestamp
+directory and force publishing all projects.  With a non-nil
+optional argument ASYNC, publishing will be done asynchronously,
+in another process."
+  (interactive "P")
+  (if async
+      (org-export-async-start 'ignore
+	`(when ',force (org-publish-remove-all-timestamps))
+	`(let ((org-publish-use-timestamps-flag
+		(if ',force nil ,org-publish-use-timestamps-flag)))
+	   (org-publish-projects ',org-publish-project-alist)))
+    (when force (org-publish-remove-all-timestamps))
+    (save-window-excursion
+      (let ((org-publish-use-timestamps-flag
+	     (if force nil org-publish-use-timestamps-flag)))
+	(org-publish-projects org-publish-project-alist)))))
+
+
+;;;###autoload
+(defun org-publish-current-file (&optional force async)
+  "Publish the current file.
+With prefix argument FORCE, force publish the file.  When
+optional argument ASYNC is non-nil, publishing will be done
+asynchronously, in another process."
+  (interactive "P")
+  (let ((file (buffer-file-name (buffer-base-buffer))))
+    (if async
+	(org-export-async-start 'ignore
+	  `(let ((org-publish-use-timestamps-flag
+		  (if ',force nil ,org-publish-use-timestamps-flag)))
+	     (org-publish-file ,file)))
+      (save-window-excursion
+	(let ((org-publish-use-timestamps-flag
+	       (if force nil org-publish-use-timestamps-flag)))
+	  (org-publish-file file))))))
+
+;;;###autoload
+(defun org-publish-current-project (&optional force async)
+  "Publish the project associated with the current file.
+With a prefix argument, force publishing of all files in
+the project."
+  (interactive "P")
+  (save-window-excursion
+    (let ((project (org-publish-get-project-from-filename
+		    (buffer-file-name (buffer-base-buffer)) 'up)))
+      (if project (org-publish project force async)
+	(error "File %s is not part of any known project"
+	       (buffer-file-name (buffer-base-buffer)))))))
+
+
+
+;;; Index generation
+
+(defun org-publish-collect-index (output backend info)
+  "Update index for a file in cache.
+
+OUTPUT is the output from transcoding current file.  BACKEND is
+the back-end that was used for transcoding.  INFO is a plist
+containing publishing and export options.
+
+The index relative to current file is stored as an alist.  An
+association has the following shape: (TERM FILE-NAME PARENT),
+where TERM is the indexed term, as a string, FILE-NAME is the
+original full path of the file where the term in encountered, and
+PARENT is a reference to the headline, if any, containing the
+original index keyword.  When non-nil, this reference is a cons
+cell.  Its CAR is a symbol among `id', `custom-id' and `name' and
+its CDR is a string."
+  (let ((file (plist-get info :input-file)))
+    (org-publish-cache-set-file-property
+     file :index
+     (delete-dups
+      (org-element-map (plist-get info :parse-tree) 'keyword
+	(lambda (k)
+	  (when (equal (org-element-property :key k) "INDEX")
+	    (let ((parent (org-export-get-parent-headline k)))
+	      (list (org-element-property :value k)
+		    file
+		    (cond
+		     ((not parent) nil)
+		     ((let ((id (org-element-property :ID parent)))
+			(and id (cons 'id id))))
+		     ((let ((id (org-element-property :CUSTOM_ID parent)))
+			(and id (cons 'custom-id id))))
+		     (t (cons 'name
+			      ;; Remove statistics cookie.
+			      (replace-regexp-in-string
+			       "\\[[0-9]+%\\]\\|\\[[0-9]+/[0-9]+\\]" ""
+			       (org-element-property :raw-value parent)))))))))
+	info))))
+  ;; Return output unchanged.
+  output)
+
+(defun org-publish-index-generate-theindex (project directory)
+  "Retrieve full index from cache and build \"theindex.org\".
+PROJECT is the project the index relates to.  DIRECTORY is the
+publishing directory."
+  (let ((all-files (org-publish-get-base-files
+		    project (plist-get (cdr project) :exclude)))
+	full-index)
+    ;; Compile full index and sort it alphabetically.
+    (dolist (file all-files
+		  (setq full-index
+			(sort (nreverse full-index)
+			      (lambda (a b) (string< (downcase (car a))
+						(downcase (car b)))))))
+      (let ((index (org-publish-cache-get-file-property file :index)))
+	(dolist (term index)
+	  (unless (member term full-index) (push term full-index)))))
+    ;; Write "theindex.inc" in DIRECTORY.
+    (with-temp-file (expand-file-name "theindex.inc" directory)
+      (let ((current-letter nil) (last-entry nil))
+	(dolist (idx full-index)
+	  (let* ((entry (org-split-string (car idx) "!"))
+		 (letter (upcase (substring (car entry) 0 1)))
+		 ;; Transform file into a path relative to publishing
+		 ;; directory.
+		 (file (file-relative-name
+			(nth 1 idx)
+			(plist-get (cdr project) :base-directory))))
+	    ;; Check if another letter has to be inserted.
+	    (unless (string= letter current-letter)
+	      (insert (format "* %s\n" letter)))
+	    ;; Compute the first difference between last entry and
+	    ;; current one: it tells the level at which new items
+	    ;; should be added.
+	    (let* ((rank (if (equal entry last-entry) (1- (length entry))
+			   (loop for n from 0 to (length entry)
+				 unless (equal (nth n entry) (nth n last-entry))
+				 return n)))
+		   (len (length (nthcdr rank entry))))
+	      ;; For each term after the first difference, create
+	      ;; a new sub-list with the term as body.  Moreover,
+	      ;; linkify the last term.
+	      (dotimes (n len)
+		(insert
+		 (concat
+		  (make-string (* (+ rank n) 2) ? ) "  - "
+		  (if (not (= (1- len) n)) (nth (+ rank n) entry)
+		    ;; Last term: Link it to TARGET, if possible.
+		    (let ((target (nth 2 idx)))
+		      (format
+		       "[[%s][%s]]"
+		       ;; Destination.
+		       (case (car target)
+			 ('nil (format "file:%s" file))
+			 (id (format "id:%s" (cdr target)))
+			 (custom-id (format "file:%s::#%s" file (cdr target)))
+			 (otherwise (format "file:%s::*%s" file (cdr target))))
+		       ;; Description.
+		       (car (last entry)))))
+		  "\n"))))
+	    (setq current-letter letter last-entry entry))))
+      ;; Create "theindex.org", if it doesn't exist yet, and provide
+      ;; a default index file.
+      (let ((index.org (expand-file-name "theindex.org" directory)))
+	(unless (file-exists-p index.org)
+	  (with-temp-file index.org
+	    (insert "#+TITLE: Index\n\n#+INCLUDE: \"theindex.inc\"\n\n")))))))
+
+
+
+;;; External Fuzzy Links Resolution
+;;
+;; This part implements tools to resolve [[file.org::*Some headline]]
+;; links, where "file.org" belongs to the current project.
+
+(defun org-publish-collect-numbering (output backend info)
+  (org-publish-cache-set-file-property
+   (plist-get info :input-file) :numbering
+   (mapcar (lambda (entry)
+	     (cons (org-split-string
+		    (replace-regexp-in-string
+		     "\\[[0-9]+%\\]\\|\\[[0-9]+/[0-9]+\\]" ""
+		     (org-element-property :raw-value (car entry))))
+		   (cdr entry)))
+	   (plist-get info :headline-numbering)))
+  ;; Return output unchanged.
+  output)
+
+(defun org-publish-resolve-external-fuzzy-link (file fuzzy)
+  "Return numbering for headline matching FUZZY search in FILE.
+
+Return value is a list of numbers, or nil.  This function allows
+to resolve external fuzzy links like:
+
+  [[file.org::*fuzzy][description]"
+  (when org-publish-cache
+    (cdr (assoc (org-split-string
+		 (if (eq (aref fuzzy 0) ?*) (substring fuzzy 1) fuzzy))
+		(org-publish-cache-get-file-property
+		 (expand-file-name file) :numbering nil t)))))
+
+
+
+;;; Caching functions
+
+(defun org-publish-write-cache-file (&optional free-cache)
+  "Write `org-publish-cache' to file.
+If FREE-CACHE, empty the cache."
+  (unless org-publish-cache
+    (error "`org-publish-write-cache-file' called, but no cache present"))
+
+  (let ((cache-file (org-publish-cache-get ":cache-file:")))
+    (unless cache-file
+      (error "Cannot find cache-file name in `org-publish-write-cache-file'"))
+    (with-temp-file cache-file
+      (let (print-level print-length)
+	(insert "(setq org-publish-cache (make-hash-table :test 'equal :weakness nil :size 100))\n")
+	(maphash (lambda (k v)
+		   (insert
+		    (format (concat "(puthash %S "
+				    (if (or (listp v) (symbolp v))
+					"'" "")
+				    "%S org-publish-cache)\n") k v)))
+		 org-publish-cache)))
+    (when free-cache (org-publish-reset-cache))))
+
+(defun org-publish-initialize-cache (project-name)
+  "Initialize the projects cache if not initialized yet and return it."
+
+  (unless project-name
+    (error "Cannot initialize `org-publish-cache' without projects name in `org-publish-initialize-cache'"))
+
+  (unless (file-exists-p org-publish-timestamp-directory)
+    (make-directory org-publish-timestamp-directory t))
+  (unless (file-directory-p org-publish-timestamp-directory)
+    (error "Org publish timestamp: %s is not a directory"
+	   org-publish-timestamp-directory))
+
+  (unless (and org-publish-cache
+	       (string= (org-publish-cache-get ":project:") project-name))
+    (let* ((cache-file
+	    (concat
+	     (expand-file-name org-publish-timestamp-directory)
+	     project-name ".cache"))
+	   (cexists (file-exists-p cache-file)))
+
+      (when org-publish-cache (org-publish-reset-cache))
+
+      (if cexists (load-file cache-file)
+	(setq org-publish-cache
+	      (make-hash-table :test 'equal :weakness nil :size 100))
+	(org-publish-cache-set ":project:" project-name)
+	(org-publish-cache-set ":cache-file:" cache-file))
+      (unless cexists (org-publish-write-cache-file nil))))
+  org-publish-cache)
+
+(defun org-publish-reset-cache ()
+  "Empty org-publish-cache and reset it nil."
+  (message "%s" "Resetting org-publish-cache")
+  (when (hash-table-p org-publish-cache)
+    (clrhash org-publish-cache))
+  (setq org-publish-cache nil))
+
+(defun org-publish-cache-file-needs-publishing
+  (filename &optional pub-dir pub-func base-dir)
+  "Check the timestamp of the last publishing of FILENAME.
+Return non-nil if the file needs publishing.  Also check if
+any included files have been more recently published, so that
+the file including them will be republished as well."
+  (unless org-publish-cache
+    (error
+     "`org-publish-cache-file-needs-publishing' called, but no cache present"))
+  (let* ((case-fold-search t)
+	 (key (org-publish-timestamp-filename filename pub-dir pub-func))
+	 (pstamp (org-publish-cache-get key))
+	 (org-inhibit-startup t)
+	 (visiting (find-buffer-visiting filename))
+	 included-files-ctime buf)
+
+    (when (equal (file-name-extension filename) "org")
+      (setq buf (find-file (expand-file-name filename)))
+      (with-current-buffer buf
+	(goto-char (point-min))
+	(while (re-search-forward
+		"^#\\+INCLUDE:[ \t]+\"\\([^\t\n\r\"]*\\)\"[ \t]*.*$" nil t)
+	  (let* ((included-file (expand-file-name (match-string 1))))
+	    (add-to-list 'included-files-ctime
+			 (org-publish-cache-ctime-of-src included-file) t))))
+      (unless visiting (kill-buffer buf)))
+    (if (null pstamp) t
+      (let ((ctime (org-publish-cache-ctime-of-src filename)))
+	(or (< pstamp ctime)
+	    (when included-files-ctime
+	      (not (null (delq nil (mapcar (lambda(ct) (< ctime ct))
+					   included-files-ctime))))))))))
+
+(defun org-publish-cache-set-file-property
+  (filename property value &optional project-name)
+  "Set the VALUE for a PROPERTY of file FILENAME in publishing cache to VALUE.
+Use cache file of PROJECT-NAME.  If the entry does not exist, it
+will be created.  Return VALUE."
+  ;; Evtl. load the requested cache file:
+  (if project-name (org-publish-initialize-cache project-name))
+  (let ((pl (org-publish-cache-get filename)))
+    (if pl (progn (plist-put pl property value) value)
+      (org-publish-cache-get-file-property
+       filename property value nil project-name))))
+
+(defun org-publish-cache-get-file-property
+  (filename property &optional default no-create project-name)
+  "Return the value for a PROPERTY of file FILENAME in publishing cache.
+Use cache file of PROJECT-NAME. Return the value of that PROPERTY
+or DEFAULT, if the value does not yet exist.  If the entry will
+be created, unless NO-CREATE is not nil."
+  ;; Evtl. load the requested cache file:
+  (if project-name (org-publish-initialize-cache project-name))
+  (let ((pl (org-publish-cache-get filename)) retval)
+    (if pl
+	(if (plist-member pl property)
+	    (setq retval (plist-get pl property))
+	  (setq retval default))
+      ;; no pl yet:
+      (unless no-create
+	(org-publish-cache-set filename (list property default)))
+      (setq retval default))
+    retval))
+
+(defun org-publish-cache-get (key)
+  "Return the value stored in `org-publish-cache' for key KEY.
+Returns nil, if no value or nil is found, or the cache does not
+exist."
+  (unless org-publish-cache
+    (error "`org-publish-cache-get' called, but no cache present"))
+  (gethash key org-publish-cache))
+
+(defun org-publish-cache-set (key value)
+  "Store KEY VALUE pair in `org-publish-cache'.
+Returns value on success, else nil."
+  (unless org-publish-cache
+    (error "`org-publish-cache-set' called, but no cache present"))
+  (puthash key value org-publish-cache))
+
+(defun org-publish-cache-ctime-of-src (file)
+  "Get the ctime of FILE as an integer."
+  (let ((attr (file-attributes
+	       (expand-file-name (or (file-symlink-p file) file)
+				 (file-name-directory file)))))
+    (+ (lsh (car (nth 5 attr)) 16)
+       (cadr (nth 5 attr)))))
+
+
+(provide 'ox-publish)
+
+;; Local variables:
+;; generated-autoload-file: "org-loaddefs.el"
+;; End:
+
+;;; ox-publish.el ends here