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+;;; org-publish.el --- publish related org-mode files as a website
+
+;; Copyright (C) 2006, 2007  Free Software Foundation, Inc.
+
+;; Author: David O'Toole <dto@gnu.org>
+;; Keywords: hypermedia, outlines
+;; Version: 1.80
+
+;; $Id: org-publish.el,v 1.80 2007/03/22 02:31:03 dto Exp dto $
+
+;; This file 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 2, or (at your option)
+;; any later version.
+
+;; This file 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; see the file COPYING.  If not, write to
+;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;; This file is part of GNU Emacs.
+
+;;; Commentary:
+
+;; Requires at least version 4.27 of org.el
+;;
+;; The official org-mode website:
+;; http://staff.science.uva.nl/~dominik/Tools/org/
+;;
+;; Home page for org-publish.el:
+;; http://dto.freeshell.org/notebook/OrgMode.html
+
+;; This program extends the HTML publishing support of Emacs Org-mode
+;; to allow configurable publishing of related sets of files as a
+;; complete website.
+;;
+;; org-publish.el can do the following:
+;;
+;; + Publish all one's org-files to html
+;; + Upload html, images, attachments and other files to a web server
+;; + Exclude selected private pages from publishing
+;; + Publish a clickable index of pages
+;; + Manage local timestamps, for publishing only changed files
+;; + Accept plugin functions to extend range of publishable content
+;;
+;; Special thanks to the org-mode maintainer Carsten Dominik for his
+;; ideas, enthusiasm, and cooperation.
+
+;;; Installation:
+
+;; Put org-publish.el in your load path, byte-compile it, and then add
+;; the following lines to your emacs initialization file:
+
+;; (autoload 'org-publish "org-publish" nil t)
+;; (autoload 'org-publish "org-publish-all" nil t)
+;; (autoload 'org-publish "org-publish-current-file" nil t)
+;; (autoload 'org-publish "org-publish-current-project" nil t)
+
+;; NOTE: When org-publish.el is included with org.el, those forms are
+;; already in the file org-install.el, and hence don't need to be put
+;; in your emacs initialization file in this case.
+
+;;; Usage:
+;;
+;; The program's main configuration variable is
+;; `org-publish-project-alist'. See below for example configurations
+;; with commentary.
+
+;; The main interactive functions are:
+;;
+;; M-x org-publish
+;; M-x org-publish-all
+;; M-x org-publish-current-file
+;; M-x org-publish-current-project
+
+;;;; Simple example configuration:
+
+;; (setq org-publish-project-alist
+;;       (list
+;;        '("org" . (:base-directory "~/org/"
+;;                   :base-extension "org"
+;;                   :publishing-directory "~/public_html"
+;;                   :with-section-numbers nil
+;;                   :table-of-contents nil
+;;                   :style "<link rel=stylesheet href=\"../other/mystyle.css\" type=\"text/css\">")))
+
+;;;; More complex example configuration:
+
+;; Imagine your *.org files are kept in ~/org, your images in
+;; ~/images, and stylesheets in ~/other. Now imagine you want to
+;; publish the files through an ssh connection to a remote host, via
+;; Tramp-mode. To maintain relative links from *.org files to /images
+;; and /other, we should replicate the same directory structure in
+;; your web server account's designated html root (in this case,
+;; assumed to be ~/html)
+
+;; Once you've done created the proper directories, you can adapt the
+;; following example configuration to your specific paths, run M-x
+;; org-publish-all, and it should publish the files to the correct
+;; directories on the web server, transforming the *.org files into
+;; HTML, and leaving other files alone.
+
+;; (setq org-publish-project-alist
+;;       (list
+;;        '("orgfiles" :base-directory "~/org/"
+;;                     :base-extension "org"
+;;                     :publishing-directory "/ssh:user@host:~/html/notebook/"
+;;                     :publishing-function org-publish-org-to-html
+;;                     :exclude "PrivatePage.org"   ;; regexp
+;;                     :headline-levels 3
+;;                     :with-section-numbers nil
+;;                     :table-of-contents nil
+;;                     :style "<link rel=stylesheet href=\"../other/mystyle.css\" type=\"text/css\">"
+;;                     :auto-preamble t
+;;                     :auto-postamble nil)
+;;
+;;         ("images" :base-directory "~/images/"
+;;                   :base-extension "jpg\\|gif\\|png"
+;;                   :publishing-directory "/ssh:user@host:~/html/images/"
+;;                   :publishing-function org-publish-attachment)
+;;
+;;         ("other"  :base-directory "~/other/"
+;;                   :base-extension "css"
+;;                   :publishing-directory "/ssh:user@host:~/html/other/"
+;;                   :publishing-function org-publish-attachment)
+;;         ("website" :components ("orgfiles" "images" "other"))))
+
+;; For more information, see the documentation for the variable
+;; `org-publish-project-alist'.
+
+;; Of course, you don't have to publish to remote directories from
+;; within emacs. You can always just publish to local folders, and
+;; then use the synchronization/upload tool of your choice.
+
+
+;;; List of user-visible changes since version 1.27
+
+;; 1.78: Allow list-valued :publishing-function
+;; 1.77: Added :preparation-function, this allows you to use GNU Make etc.
+;; 1.65: Remove old "composite projects". They're redundant.
+;; 1.64: Allow meta-projects with :components
+;; 1.57: Timestamps flag is now called "org-publish-use-timestamps-flag"
+;; 1.52: Properly set default for :index-filename
+;; 1.48: Composite projects allowed.
+;;       :include keyword allowed.
+;; 1.43: Index no longer includes itself in the index.
+;; 1.42: Fix "function definition is void" error
+;;       when :publishing-function not set in org-publish-current-file.
+;; 1.41: Fixed bug where index isn't published on first try.
+;; 1.37: Added interactive function "org-publish". Prompts for particular
+;;       project name to publish.
+;; 1.34: Added force-publish option to all interactive functions.
+;; 1.32: Fixed "index.org has changed on disk" error during index publishing.
+;; 1.30: Fixed startup error caused by (require 'em-unix)
+
+;;; Code:
+
+
+(eval-when-compile
+  (require 'cl))
+
+
+(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:
+
+  (:property value :property value ... )
+
+OR,
+
+  (: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 M-x 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.
+    :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 publishing 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. The default is
+                             org-publish-org-to-html, but other
+                             values are possible. May also 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.
+
+Some properties control details of the Org publishing process,
+and are equivalent to the corresponding user variables listed in
+the right column. See the documentation for those variables to
+learn more about their use and default values.
+
+    :language              org-export-default-language
+    :headline-levels       org-export-headline-levels
+    :section-numbers       org-export-with-section-numbers
+    :table-of-contents     org-export-with-toc
+    :emphasize             org-export-with-emphasize
+    :sub-superscript       org-export-with-sub-superscripts
+    :TeX-macros            org-export-with-TeX-macros
+    :fixed-width           org-export-with-fixed-width
+    :tables                org-export-with-tables
+    :table-auto-headline   org-export-highlight-first-table-line
+    :style                 org-export-html-style
+    :convert-org-links     org-export-html-link-org-files-as-html
+    :inline-images         org-export-html-inline-images
+    :expand-quoted-html    org-export-html-expand
+    :timestamp             org-export-html-with-timestamp
+    :publishing-directory  org-export-publishing-directory
+    :preamble              org-export-html-preamble
+    :postamble             org-export-html-postamble
+    :auto-preamble         org-export-html-auto-preamble
+    :auto-postamble        org-export-html-auto-postamble
+    :author                user-full-name
+    :email                 user-mail-address
+
+The following properties may be used to control publishing of an
+index of files or summary page for a given project.
+
+    :auto-index            Whether to publish an index during
+                           org-publish-current-project or org-publish-all.
+    :index-filename        Filename for output of index. Defaults
+                           to 'index.org' (which becomes 'index.html')
+    :index-title           Title of index page. Defaults to name of file.
+    :index-function        Plugin function to use for generation of index.
+                           Defaults to 'org-publish-org-index', which
+                           generates a plain list of links to all files
+                           in the project.
+"
+  :group 'org-publish
+  :type 'alist)
+
+
+(defcustom org-publish-use-timestamps-flag t
+  "When non-nil, use timestamp checking to publish only changed files.
+When nil, do no timestamp checking and always publish all
+files."
+  :group 'org-publish
+  :type 'boolean)
+
+
+(defcustom org-publish-timestamp-directory "~/.org-timestamps/"
+  "Name of directory in which to store publishing timestamps."
+  :group 'org-publish
+  :type 'string)
+
+
+;;;; Timestamp-related functions
+
+
+(defun org-publish-timestamp-filename (filename)
+  "Return path to timestamp file for filename FILENAME."
+  (while (string-match "~\\|/" filename)
+    (setq filename (replace-match "_" nil t filename)))
+  (concat org-publish-timestamp-directory filename ".timestamp"))
+
+
+(defun org-publish-needed-p (filename)
+  "Check whether file should be published.
+If org-publish-use-timestamps-flag is set to nil, this function always
+returns t. Otherwise, check the timestamps folder to determine
+whether file should be published."
+  (if org-publish-use-timestamps-flag
+      (progn
+        ;;
+        ;; create folder if needed
+        (if (not (file-exists-p org-publish-timestamp-directory))
+            (make-directory org-publish-timestamp-directory)
+          (if (not (file-directory-p org-publish-timestamp-directory))
+              (error "org-publish-timestamp-directory must be a directory.")))
+        ;;
+        ;; check timestamp. ok if timestamp file doesn't exist
+        (let* ((timestamp (org-publish-timestamp-filename filename))
+               (rtn (file-newer-than-file-p filename timestamp)))
+          (if rtn
+              ;; handle new timestamps
+              (if (not (file-exists-p timestamp))
+                  ;; create file
+                  (with-temp-buffer
+                    (make-directory (file-name-directory timestamp) :parents)
+                    (write-file timestamp)
+                    (kill-buffer (current-buffer)))))
+          rtn))
+    t))
+
+
+(defun org-publish-update-timestamp (filename)
+  "Update publishing timestamp for file FILENAME."
+  (let ((timestamp (org-publish-timestamp-filename filename)))
+    ;; Emacs 21 doesn't have set-file-times
+    (if (fboundp 'set-file-times)
+        (set-file-times timestamp)
+      (call-process "touch" nil 0 nil timestamp))))
+
+
+;;;; A hash mapping files to project names
+
+
+(defvar org-publish-files (make-hash-table :test 'equal) "Hash
+table mapping file names to project names.")
+
+
+;;;; Checking filenames against this hash
+
+
+(defun org-publish-validate-link (link &optional directory)
+  (gethash (file-truename (expand-file-name link directory))
+           org-publish-files))
+
+
+;;;; Getting project information out of org-publish-project-alist
+
+
+(defun org-publish-get-plists (&optional project-name)
+ "Return a list of property lists for project PROJECT-NAME.
+When argument is not given, return all property lists for all projects."
+ (let ((alist (if project-name
+                   (list (assoc project-name org-publish-project-alist))
+                 org-publish-project-alist))
+        (project nil)
+        (plists nil)
+        (single nil)
+        (components nil))
+
+   ;;
+   ;;
+   (while (setq project (pop alist))
+     ;; what kind of project is it?
+     (if (setq components (plist-get (cdr project) :components))
+          ;; meta project. annotate each plist with name of enclosing project
+          (setq single
+                (apply 'append
+                       (mapcar 'org-publish-get-plists components)))
+        ;; normal project
+        (setq single (list (cdr project))))
+     ;;
+     (setq plists (append plists single))
+     (dolist (p single)
+        (let* ((exclude (plist-get p :exclude))
+               (files (org-publish-get-base-files p exclude)))
+          (dolist (f files)
+            (puthash (file-truename f) (car project) org-publish-files)))))
+   plists))
+
+
+
+(defun org-publish-get-base-files (plist &optional exclude-regexp)
+  "Return a list of all files in project defined by PLIST.
+If EXCLUDE-REGEXP is set, this will be used to filter out
+matching filenames."
+  (let* ((dir (file-name-as-directory (plist-get plist :base-directory)))
+         (include-list (plist-get plist :include))
+         (extension (or (plist-get plist :base-extension) "org"))
+         (regexp (concat "^[^\\.].*\\.\\(" extension "\\)$"))
+         (allfiles (directory-files dir t regexp)))
+    ;;
+    ;; exclude files
+    (setq allfiles
+          (if (not exclude-regexp)
+              allfiles
+            (delq nil
+                  (mapcar (lambda (x)
+                            (if (string-match exclude-regexp x) nil x))
+                          allfiles))))
+    ;;
+    ;; include extra files
+    (let ((inc nil))
+      (while (setq inc (pop include-list))
+        (setq allfiles (cons (expand-file-name inc dir) allfiles))))
+
+    allfiles))
+
+
+(defun org-publish-get-project-from-filename (filename)
+  "Figure out which project a given FILENAME belongs to, if any.
+Filename should contain full path. Returns name of project, or
+nil if not found."
+  (org-publish-get-plists)
+  (gethash (file-truename filename) org-publish-files))
+
+
+(defun org-publish-get-plist-from-filename (filename)
+  "Return publishing configuration plist for file FILENAME."
+  (let ((found nil))
+    (mapcar
+     (lambda (plist)
+       (let ((files (org-publish-get-base-files plist)))
+         (if (member (expand-file-name filename) files)
+             (setq found plist))))
+     (org-publish-get-plists))
+    found))
+
+
+
+;;;; Pluggable publishing back-end functions
+
+
+(defun org-publish-org-to-html (plist filename)
+  "Publish an org file to HTML.
+PLIST is the property list for the given project.
+FILENAME is the filename of the org file to be published."
+  (require 'org)
+  (let* ((arg (plist-get plist :headline-levels)))
+    (progn
+      (find-file filename)
+      (org-export-as-html arg nil plist)
+      ;; get rid of HTML buffer
+      (kill-buffer (current-buffer)))))
+
+
+(defun org-publish-attachment (plist filename)
+  "Publish a file with no transformation of any kind.
+PLIST is the property list for the given project.
+FILENAME is the filename of the file to be published."
+  ;; make sure eshell/cp code is loaded
+  (require 'eshell)
+  (require 'esh-maint)
+  (require 'em-unix)
+  (let ((destination (file-name-as-directory (plist-get plist :publishing-directory))))
+    (eshell/cp filename destination)))
+
+
+;;;; Publishing files, sets of files, and indices
+
+
+(defun org-publish-file (filename)
+  "Publish file FILENAME."
+  (let* ((project-name (org-publish-get-project-from-filename filename))
+         (plist (org-publish-get-plist-from-filename filename))
+         (publishing-function (or (plist-get plist :publishing-function) 'org-publish-org-to-html)))
+    (if (not project-name)
+        (error (format "File %s is not part of any known project." filename)))
+    (when (org-publish-needed-p filename)
+      (if (listp publishing-function)
+          ;; allow chain of publishing functions
+          (mapc (lambda (f)
+                  (funcall f plist filename)) 
+                publishing-function)
+        (funcall publishing-function plist filename))
+      (org-publish-update-timestamp filename))))
+
+
+(defun org-publish-plist (plist)
+  "Publish all files in set defined by PLIST.
+ If :auto-index is set, publish the index too."
+  (let* ((exclude-regexp (plist-get plist :exclude))
+         (publishing-function (or (plist-get plist :publishing-function) 'org-publish-org-to-html))
+         (index-p (plist-get plist :auto-index))
+         (index-filename (or (plist-get plist :index-filename) "index.org"))
+         (index-function (or (plist-get plist :index-function) 'org-publish-org-index))
+         (preparation-function (plist-get plist :preparation-function))
+         (f nil))
+    ;;
+    (when preparation-function
+      (funcall preparation-function))
+    (if index-p
+        (funcall index-function plist index-filename))
+    (let ((files (org-publish-get-base-files plist exclude-regexp)))
+      (while (setq f (pop files))
+        ;; check timestamps
+        (when (org-publish-needed-p f)
+          (if (listp publishing-function)
+              ;; allow chain of publishing functions
+              (mapc (lambda (func)
+                      (funcall func plist f)) 
+                    publishing-function)
+            (funcall publishing-function plist f))
+          (org-publish-update-timestamp f))))))
+
+
+(defun org-publish-org-index (plist &optional index-filename)
+  "Create an index of pages in set defined by PLIST.
+Optionally set the filename of the index with INDEX-FILENAME;
+default is 'index.org'."
+  (let* ((dir (file-name-as-directory (plist-get plist :base-directory)))
+         (exclude-regexp (plist-get plist :exclude))
+         (files (org-publish-get-base-files plist exclude-regexp))
+         (index-filename (concat dir (or index-filename "index.org")))
+         (index-buffer (find-buffer-visiting index-filename))
+         (ifn (file-name-nondirectory index-filename))
+         (f nil))
+    ;;
+    ;; if buffer is already open, kill it to prevent error message
+    (if index-buffer
+        (kill-buffer index-buffer))
+    (with-temp-buffer
+      (while (setq f (pop files))
+        (let ((fn (file-name-nondirectory f)))
+          (unless (string= fn ifn) ;; index shouldn't index itself
+            (insert (concat " + [[file:" fn "]["
+                            (file-name-sans-extension fn)
+                            "]]\n")))))
+      (write-file index-filename)
+      (kill-buffer (current-buffer)))))
+
+
+;(defun org-publish-meta-index (meta-plist &optional index-filename)
+;  "Create an index for a metaproject."
+;  (let* ((plists (
+
+
+;;;; Interactive publishing functions
+
+
+;;;###autoload
+(defun org-publish (project-name &optional force)
+  "Publish the project PROJECT-NAME."
+  (interactive (list (completing-read "Project name: " org-publish-project-alist
+                                      nil t)
+                     current-prefix-arg))
+  (save-window-excursion
+    (let ((org-publish-use-timestamps-flag (if force nil t))
+          (plists (org-publish-get-plists project-name)))
+      (mapcar 'org-publish-plist plists))))
+
+
+;;;###autoload
+(defun org-publish-current-project (&optional force)
+  "Publish the project associated with the current file.
+With prefix argument, force publishing all files in project."
+  (interactive "P")
+  (save-window-excursion
+    (let* ((project-name (org-publish-get-project-from-filename (buffer-file-name)))
+           (org-publish-use-timestamps-flag (if force nil t)))
+      (if (not project-name)
+          (error (format "File %s is not part of any known project." (buffer-file-name))))
+      (org-publish project-name))))
+
+
+;;;###autoload
+(defun org-publish-current-file (&optional force)
+  "Publish the current file.
+With prefix argument, force publish the file."
+  (interactive "P")
+  (save-window-excursion
+    (let ((org-publish-use-timestamps-flag
+           (if force nil t)))
+      (org-publish-file (buffer-file-name)))))
+
+
+;;;###autoload
+(defun org-publish-all (&optional force)
+  "Publish all projects.
+With prefix argument, force publish all files."
+  (interactive "P")
+  (save-window-excursion
+    (let ((org-publish-use-timestamps-flag
+           (if force nil t))
+          (plists (org-publish-get-plists)))
+      (mapcar 'org-publish-plist plists))))
+
+
+
+(provide 'org-publish)
+;;; org-publish.el ends here