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;; org.el --- Outline-based notes management and organizer
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;; Carstens outline-mode for keeping track of everything.
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;; Copyright (C) 2004, 2005 Free Software Foundation, Inc.
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;;
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;; Author: Carsten Dominik <dominik at science dot uva dot nl>
;; Keywords: outlines, hypermedia, calendar
;; Homepage: http://www.astro.uva.nl/~dominik/Tools/org/
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;; Version: 3.14
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;;
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;; This file is part of GNU Emacs.
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;;
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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 2, or (at your option)
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;; any later version.

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;; 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
;; along with GNU Emacs; see the file COPYING.  If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:
;;
;; Org-mode is a mode for keeping notes, maintaining ToDo lists, and doing
;; project planning with a fast and effective plain-text system.
;;
;; Org-mode develops organizational tasks around a NOTES file that contains
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;; information about projects as plain text.  Org-mode is implemented on top
;; of outline-mode - ideal to keep the content of large files well structured.
;; It supports ToDo items, deadlines and time stamps, which can be extracted
;; to create a daily/weekly agenda that also integrates the diary of the Emacs
;; calendar.  Tables are easily created with a built-in table editor.  Plain
;; text URL-like links connect to websites, emails (VM, RMAIL, WANDERLUST),
;; Usenet messages (Gnus), BBDB entries, and any files related to the
;; projects.  For printing and sharing of notes, an Org-mode file (or a part
;; of it) can be exported as a structured ASCII file, or as HTML.
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;;
;; Installation
;; ------------
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;; If Org-mode is part of the Emacs distribution or an XEmacs package, you
;; only need to copy the following lines to your .emacs file.  The last two
;; lines define *global* keys for the commands `org-store-link' and
;; `org-agenda' - please choose suitable keys yourself.
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;;
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;;    (add-to-list 'auto-mode-alist '("\\.org$" . org-mode))
;;    (define-key global-map "\C-cl" 'org-store-link)
;;    (define-key global-map "\C-ca" 'org-agenda)
;;
;; If you have downloaded Org-mode from the Web, you must byte-compile
;; org.el and put it on your load path.  In addition to the Emacs Lisp
;; lines above, you also need to add the following lines to .emacs:
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;;
;;    (autoload 'org-mode "org" "Org mode" t)
;;    (autoload 'org-diary "org" "Diary entries from Org mode")
;;    (autoload 'org-agenda "org" "Multi-file agenda from Org mode" t)
;;    (autoload 'org-store-link "org" "Store a link to the current location" t)
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;;    (autoload 'orgtbl-mode "org" "Org tables as a minor mode" t)
;;    (autoload 'turn-on-orgtbl "org" "Org tables as a minor mode")
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;;
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;; This setup will put all files with extension ".org" into Org-mode.  As
;; an alternative, make the first line of a file look like this:
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;;
;;     MY PROJECTS    -*- mode: org; -*-
;;
;; which will select Org-mode for this buffer no matter what the file's
;; name is.
;;
;; Documentation
;; -------------
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;; The documentation of Org-mode can be found in the TeXInfo file.  The
;; distribution also contains a PDF version of it.  At the homepage of
;; Org-mode, you can read the same text online as HTML.  There is also an
;; excellent reference card made by Philip Rooke.
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;;
;; Changes:
;; -------
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;; Version 3.14
;;    - Formulas for individual fields in table.
;;    - Automatic recalculation in calculating tables.
;;    - Named fields and columns in tables.
;;    - Fixed bug with calling `org-archive' several times in a row.
;;
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;; Version 3.13
;;    - Efficiency improvements:  Fewer table re-alignments needed.
;;    - New special lines in tables, for defining names for individual cells.
;;
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;; Version 3.12
;;    - Tables can store formulas (one per column) and compute fields.
;;      Not quite like a full spreadsheet, but very powerful.
;;    - table.el keybinding is now `C-c ~'.
;;    - Numeric argument to org-cycle does `show-subtree' above on level ARG.
;;    - Small changes to keys in agenda buffer.  Affected keys:
;;      [w] weekly view; [d] daily view; [D] toggle diary inclusion.
;;    - Bug fixes.
;;
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;; Version 3.11
;;    - Links inserted with C-c C-l are now by default enclosed in angle
;;      brackets.  See the new variable `org-link-format'.
;;    - ">" terminates a link, this is a way to have several links in a line.
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;;      Both "<" and ">" are no longer allowed as characters in a link.
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;;    - Archiving of finished tasks.
;;    - C-<up>/<down> bindings removed, to allow access to paragraph commands.
;;    - Compatibility with CUA-mode (see variable `org-CUA-compatible').
;;    - Compatibility problems with viper-mode fixed.
;;    - Improved html export of tables.
;;    - Various clean-up changes.
;;
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;; Version 3.10
;;    - Using `define-derived-mode' to derive `org-mode' from `outline-mode'.
;;
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;; Version 3.09
;;    - Time-of-day specifications in agenda are extracted and placed
;;      into the prefix.  Timed entries can be placed into a time grid for
;;      day.
;;
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;; Version 3.08
;;    - "|" no longer allowed as part of a link, to allow links in tables.
;;    - The prefix of items in the agenda buffer can be configured.
;;    - Cleanup.
;;
;; Version 3.07
;;    - Some folding incinsistencies removed.
;;    - BBDB links to company-only entries.
;;    - Bug fixes and global cleanup.
;;
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;; Version 3.06
;;    - M-S-RET inserts a new TODO heading.
;;    - New startup option `content'.
;;    - Better visual response when TODO items in agenda change status.
;;    - Window positioning after visibility state changes optimized and made
;;      configurable.  See `org-cycle-hook' and `org-occur-hook'.
;;
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;; Version 3.05
;;    - Agenda entries from the diary are linked to the diary file, so
;;      adding and editing diary entries can be done directly from the agenda.
;;    - Many calendar/diary commands available directly from agenda.
;;    - Field copying in tables with S-RET does increment.
;;    - C-c C-x C-v extracts the visible part of the buffer for printing.
;;    - Moving subtrees up and down preserves the whitespace at the tree end.
;;
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;; Version 3.04
;;    - Table editor optimized to need fewer realignments, and to keep
;;      table shape when typing in fields.
;;    - A new minor mode, orgtbl-mode, introduces the Org-mode table editor
;;      into arbitrary major modes.
;;    - Fixed bug with realignment in XEmacs.
;;    - Startup options can be set with special #+STARTUP line.
;;    - Heading following a match in org-occur can be suppressed.
;;
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;; Version 3.03
;;    - Copyright transfer to the FSF.
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;;    - Effect of C-u and C-u C-u in org-timeline swapped.
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;;    - Timeline now always contains today, and `.' jumps to it.
;;    - Table editor:
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;;      - cut and paste of rectangular regions in tables
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;;      - command to convert org-mode table to table.el table and back
;;      - command to treat several cells like a paragraph and fill it
;;      - command to convert a buffer region to a table
;;      - import/export tables as tab-separated files (exchange with Excel)
;;    - Agenda:
;;      - Sorting mechanism for agenda items rewritten from scratch.
;;      - Sorting fully configurable.
;;      - Entries specifying a time are sorted together.
;;    - Completion also covers option keywords after `#-'.
;;    - Bug fixes.
;;
;; Version 3.01
;;    - New reference card, thanks to Philip Rooke for creating it.
;;    - Single file agenda renamed to "Timeline".  It no longer shows
;;      warnings about upcoming deadlines/overdue scheduled items.
;;      That functionality is now limited to the (multifile) agenda.
;;    - When reading a date, the calendar can be manipulated with keys.
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;;    - Link support for RMAIL and Wanderlust (from planner.el, untested).
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;;    - Minor bug fixes and documentation improvements.

;;; Code:

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(eval-when-compile (require 'cl) (require 'calendar))
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(require 'outline)
(require 'time-date)
(require 'easymenu)

;;; Customization variables

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(defvar org-version "3.14"
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  "The version number of the file org.el.")
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(defun org-version ()
  (interactive)
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  (message "Org-mode version %s" org-version))

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;; The following two constants are for compatibility with different Emacs
;; versions (Emacs versus XEmacs) and with different versions of outline.el.
;; The compatibility code in org.el is based on these two constants.
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(defconst org-xemacs-p (featurep 'xemacs)
  "Are we running xemacs?")
(defconst org-noutline-p (featurep 'noutline)
  "Are we using the new outline mode?")

(defgroup org nil
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  "Outline-based notes management and organizer "
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  :tag "Org"
  :group 'outlines
  :group 'hypermedia
  :group 'calendar)

(defgroup org-startup nil
  "Options concerning startup of Org-mode."
  :tag "Org Startup"
  :group 'org)

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(defcustom org-CUA-compatible nil
  "Non-nil means use alternative key bindings for S-<cursor movement>.
Org-mode used S-<cursor movement> for changing timestamps and priorities.
S-<cursor movement> is also used for example by `CUA-mode' to select text.
If you want to use Org-mode together with `CUA-mode', Org-mode needs to use
alternative bindings.  Setting this variable to t will replace the following
keys both in Org-mode and in the Org-agenda buffer.

S-RET   -> C-S-RET
S-up    -> M-p
S-down  -> M-n
S-left  -> M--
S-right -> M-+

If you do not like the alternative keys, take a look at the variable
`org-disputed-keys'.

This option is only relevant at load-time of Org-mode.  Changing it requires
a restart of Emacs to become effective."
  :group 'org-startup
  :type 'boolean)

(defvar org-disputed-keys
  '((S-up     [(shift up)]      [(meta ?p)])
    (S-down   [(shift down)]    [(meta ?n)])
    (S-left   [(shift left)]    [(meta ?-)])
    (S-right  [(shift right)]   [(meta ?+)])
    (S-return [(shift return)]  [(control shift return)]))
  "Keys for which Org-mode and other modes compete.
This is an alist, cars are symbols for lookup, 1st element is the default key,
second element will be used when `org-CUA-compatible' is t.")

(defun org-key (key)
  "Select a key according to `org-CUA-compatible'."
  (nth (if org-CUA-compatible 2 1)
       (or (assq key org-disputed-keys)
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	   (error "Invalid Key %s in `org-key'" key))))
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(defcustom org-startup-folded t
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  "Non-nil means, entering Org-mode will switch to OVERVIEW.
This can also be configured on a per-file basis by adding one of
the following lines anywhere in the buffer:

   #+STARTUP: fold
   #+STARTUP: nofold
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   #+STARTUP: content"
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  :group 'org-startup
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  :type '(choice
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	  (const :tag "nofold: show all" nil)
	  (const :tag "fold: overview" t)
	  (const :tag "content: all headlines" content)))
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(defcustom org-startup-truncated t
  "Non-nil means, entering Org-mode will set `truncate-lines'.
This is useful since some lines containing links can be very long and
uninteresting.  Also tables look terrible when wrapped."
  :group 'org-startup
  :type 'boolean)

(defcustom org-startup-with-deadline-check nil
  "Non-nil means, entering Org-mode will run the deadline check.
This means, if you start editing an org file, you will get an
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immediate reminder of any due deadlines.
This can also be configured on a per-file basis by adding one of
the following lines anywhere in the buffer:

   #+STARTUP: dlcheck
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   #+STARTUP: nodlcheck"
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  :group 'org-startup
  :type 'boolean)

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(defcustom org-insert-mode-line-in-empty-file nil
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  "Non-nil means insert the first line setting Org-mode in empty files.
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When the function `org-mode' is called interactively in an empty file, this
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normally means that the file name does not automatically trigger Org-mode.
To ensure that the file will always be in Org-mode in the future, a
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line enforcing Org-mode will be inserted into the buffer, if this option
has been set."
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  :group 'org-startup
  :type 'boolean)

(defgroup org-keywords nil
  "Options concerning TODO items in Org-mode."
  :tag "Org Keywords"
  :group 'org)

(defcustom org-todo-keywords '("TODO" "DONE")
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  "List of TODO entry keywords.
\\<org-mode-map>By default, this is '(\"TODO\" \"DONE\").  The last entry in the list is
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considered to mean that the entry is \"done\".  All the other mean that
action is required, and will make the entry show up in todo lists, diaries
etc.
The command \\[org-todo] cycles an entry through these states, and an
additional state where no keyword is present.  For details about this
cycling, see also the variable `org-todo-interpretation'
Changes become only effective after restarting Emacs."
  :group 'org-keywords
  :type '(repeat (string :tag "Keyword")))

(defcustom org-todo-interpretation 'sequence
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  "Controls how TODO keywords are interpreted.
\\<org-mode-map>Possible values are `sequence' and `type'.
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This variable is only relevant if `org-todo-keywords' contains more than two
states.  There are two ways how these keywords can be used:

- As a sequence in the process of working on a TODO item, for example
  (setq org-todo-keywords '(\"TODO\" \"STARTED\" \"VERIFY\" \"DONE\")
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	org-todo-interpretation 'sequence)
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- As different types of TODO items, for example
  (setq org-todo-keywords '(\"URGENT\" \"RELAXED\" \"REMIND\" \"FOR_TOM\" \"DONE\")
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	org-todo-interpretation 'type)
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When the states are interpreted as a sequence, \\[org-todo] always cycles
to the next state, in order to walk through all different states.  So with
\\[org-todo], you turn an empty entry into the state TODO.  When you started
working on the item, you use \\[org-todo] again to switch it to \"STARTED\",
later to VERIFY and finally to DONE.

When the states are interpreted as types, \\[org-todo] still cycles through
when it is called several times in direct succession, in order to initially
select the type.  However, if not called immediately after a previous
\\[org-todo], it switches from each type directly to DONE.  So with the
above example, you could use `\\[org-todo] \\[org-todo]' to label an entry
RELAXED.  If you later return to this entry and press \\[org-todo] again,
RELAXED will not be changed REMIND, but directly to DONE.

You can create a large number of types.  To initially select a
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type, it is then best to use \\[universal-argument] \\[org-todo] in order to specify the
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type with completion.  Of course, you can also type the keyword
directly into the buffer.  M-TAB completes TODO keywords at the
beginning of a headline."
  :group 'org-keywords
  :type '(choice (const sequence)
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		 (const type)))
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(defcustom org-default-priority ?B
  "The default priority of TODO items.
This is the priority an item get if no explicit priority is given."
  :group 'org-keywords
  :type 'character)

(defcustom org-lowest-priority ?C
  "The lowest priority of TODO items.  A character like ?A, ?B etc."
  :group 'org-keywords
  :type 'character)

(defcustom org-deadline-string "DEADLINE:"
  "String to mark deadline entries.
A deadline is this string, followed by a time stamp.  Should be a word,
terminated by a colon.  You can insert a schedule keyword and
a timestamp with \\[org-deadline].
Changes become only effective after restarting Emacs."
  :group 'org-keywords
  :type 'string)

(defcustom org-scheduled-string "SCHEDULED:"
  "String to mark scheduled TODO entries.
A schedule is this string, followed by a time stamp.  Should be a word,
terminated by a colon.  You can insert a schedule keyword and
a timestamp with \\[org-schedule].
Changes become only effective after restarting Emacs."
  :group 'org-keywords
  :type 'string)

(defcustom org-comment-string "COMMENT"
  "Entries starting with this keyword will never be exported.
An entry can be toggled between COMMENT and normal with
\\[org-toggle-comment].
Changes become only effective after restarting Emacs."
  :group 'org-keywords
  :type 'string)

(defcustom org-after-todo-state-change-hook nil
  "Hook which is run after the state of a TODO item was changed.
The new state (a string with a todo keyword, or nil) is available in the
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Lisp variable `state'."
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  :group 'org-keywords
  :type 'hook)

;; Variables for pre-computed regular expressions, all buffer local
(defvar org-todo-kwd-priority-p nil
  "Do TODO items have priorities?")
(make-variable-buffer-local 'org-todo-kwd-priority-p)
(defvar org-todo-kwd-max-priority nil
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  "Maximum priority of TODO items.")
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(make-variable-buffer-local 'org-todo-kwd-max-priority)
(defvar org-ds-keyword-length 12
  "Maximum length of the Deadline and SCHEDULED keywords.")
(make-variable-buffer-local 'org-ds-keyword-length)
(defvar org-done-string nil
  "The last string in `org-todo-keywords', indicating an item is DONE.")
(make-variable-buffer-local 'org-done-string)
(defvar org-todo-regexp nil
  "Matches any of the TODO state keywords.")
(make-variable-buffer-local 'org-todo-regexp)
(defvar org-not-done-regexp nil
  "Matches any of the TODO state keywords except the last one.")
(make-variable-buffer-local 'org-not-done-regexp)
(defvar org-todo-line-regexp nil
  "Matches a headline and puts TODO state into group 2 if present.")
(make-variable-buffer-local 'org-todo-line-regexp)
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(defvar org-nl-done-regexp nil
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  "Matches newline followed by a headline with the DONE keyword.")
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(make-variable-buffer-local 'org-nl-done-regexp)
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(defvar org-looking-at-done-regexp nil
  "Matches the DONE keyword a point.")
(make-variable-buffer-local 'org-looking-at-done-regexp)
(defvar org-deadline-regexp nil
  "Matches the DEADLINE keyword.")
(make-variable-buffer-local 'org-deadline-regexp)
(defvar org-deadline-time-regexp nil
  "Matches the DEADLINE keyword together with a time stamp.")
(make-variable-buffer-local 'org-deadline-time-regexp)
(defvar org-deadline-line-regexp nil
  "Matches the DEADLINE keyword and the rest of the line.")
(make-variable-buffer-local 'org-deadline-line-regexp)
(defvar org-scheduled-regexp nil
  "Matches the SCHEDULED keyword.")
(make-variable-buffer-local 'org-scheduled-regexp)
(defvar org-scheduled-time-regexp nil
  "Matches the SCHEDULED keyword together with a time stamp.")
(make-variable-buffer-local 'org-scheduled-time-regexp)

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(defvar org-category nil
  "Variable used by org files to set a category for agenda display.
Such files should use a file variable to set it, for example

   -*- mode: org; org-category: \"ELisp\"

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or contain a special line

#+CATEGORY: ELisp

If the file does not specify a category, then file's base name
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is used instead.")

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(defun org-set-regexps-and-options ()
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  "Precompute regular expressions for current buffer."
  (when (eq major-mode 'org-mode)
    (let ((re (org-make-options-regexp
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	       '("CATEGORY" "SEQ_TODO" "PRI_TODO" "TYP_TODO"
		 "STARTUP" "ARCHIVE")))
	  (splitre "[ \t]+")
	  kwds int key value cat arch)
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      (save-excursion
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	(save-restriction
	  (widen)
	  (goto-char (point-min))
	  (while (re-search-forward re nil t)
	    (setq key (match-string 1) value (match-string 2))
	    (cond
	     ((equal key "CATEGORY")
	      (if (string-match "[ \t]+$" value)
		  (setq value (replace-match "" t t value)))
	      (setq cat (intern value)))
	     ((equal key "SEQ_TODO")
	      (setq int 'sequence
		    kwds (append kwds (org-split-string value splitre))))
	     ((equal key "PRI_TODO")
	      (setq int 'priority
		    kwds (append kwds (org-split-string value splitre))))
	     ((equal key "TYP_TODO")
	      (setq int 'type
		    kwds (append kwds (org-split-string value splitre))))
	     ((equal key "STARTUP")
	      (let ((opts (org-split-string value splitre))
		    (set '(("fold" org-startup-folded t)
			   ("nofold" org-startup-folded nil)
			   ("content" org-startup-folded content)
			   ("dlcheck" org-startup-with-deadline-check t)
			   ("nodlcheck" org-startup-with-deadline-check nil)))
		    l var val)
		(while (setq l (assoc (pop opts) set))
		  (setq var (nth 1 l) val (nth 2 l))
		  (set (make-local-variable var) val))))
	     ((equal key "ARCHIVE")
	      (string-match " *$" value)
	      (setq arch (replace-match "" t t value))
	      (remove-text-properties 0 (length arch)
				      '(face t fontified t) arch)))
	    )))
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      (and cat (set (make-local-variable 'org-category) cat))
      (and kwds (set (make-local-variable 'org-todo-keywords) kwds))
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      (and arch (set (make-local-variable 'org-archive-location) arch))
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      (and int (set (make-local-variable 'org-todo-interpretation) int)))
    ;; Compute the regular expressions and other local variables
    (setq org-todo-kwd-priority-p (equal org-todo-interpretation 'priority)
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	  org-todo-kwd-max-priority (1- (length org-todo-keywords))
	  org-ds-keyword-length (+ 2 (max (length org-deadline-string)
					  (length org-scheduled-string)))
	  org-done-string
	  (nth (1- (length org-todo-keywords)) org-todo-keywords)
	  org-todo-regexp
	  (concat "\\<\\(" (mapconcat 'regexp-quote org-todo-keywords
				      "\\|") "\\)\\>")
	  org-not-done-regexp
	  (concat "\\<\\("
		  (mapconcat 'regexp-quote
			     (nreverse (cdr (reverse org-todo-keywords)))
			     "\\|")
		  "\\)\\>")
	  org-todo-line-regexp
	  (concat "^\\(\\*+\\)[ \t]*\\("
		  (mapconcat 'regexp-quote org-todo-keywords "\\|")
		  "\\)? *\\(.*\\)")
	  org-nl-done-regexp
	  (concat "[\r\n]\\*+[ \t]+" org-done-string "\\>")
	  org-looking-at-done-regexp (concat "^" org-done-string "\\>")
	  org-deadline-regexp (concat "\\<" org-deadline-string)
	  org-deadline-time-regexp
	  (concat "\\<" org-deadline-string " *<\\([^>]+\\)>")
	  org-deadline-line-regexp
	  (concat "\\<\\(" org-deadline-string "\\).*")
	  org-scheduled-regexp
	  (concat "\\<" org-scheduled-string)
	  org-scheduled-time-regexp
	  (concat "\\<" org-scheduled-string " *<\\([^>]+\\)>"))
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    (org-set-font-lock-defaults)))

(defgroup org-time nil
  "Options concerning time stamps and deadlines in Org-mode."
  :tag "Org Time"
  :group 'org)

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(defconst org-time-stamp-formats '("<%Y-%m-%d %a>" . "<%Y-%m-%d %a %H:%M>")
  "Formats for `format-time-string' which are used for time stamps.
It is not recommended to change this constant.")


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(defcustom org-deadline-warning-days 30
  "No. of days before expiration during which a deadline becomes active.
This variable governs the display in the org file."
  :group 'org-time
  :type 'number)

(defcustom org-popup-calendar-for-date-prompt t
  "Non-nil means, pop up a calendar when prompting for a date.
In the calendar, the date can be selected with mouse-1.  However, the
minibuffer will also be active, and you can simply enter the date as well.
When nil, only the minibuffer will be available."
  :group 'org-time
  :type 'number)

(defcustom org-calendar-follow-timestamp-change t
  "Non-nil means, make the calendar window follow timestamp changes.
When a timestamp is modified and the calendar window is visible, it will be
moved to the new date."
  :group 'org-time
  :type 'boolean)

(defgroup org-agenda nil
  "Options concerning agenda display Org-mode."
  :tag "Org Agenda"
  :group 'org)

(defcustom org-agenda-files nil
  "A list of org files for agenda/diary display.
Entries are added to this list with \\[org-add-file] and removed with
\\[org-remove-file].  You can also use customize to edit the list."
  :group 'org-agenda
  :type '(repeat file))

(defcustom org-select-timeline-window t
  "Non-nil means, after creating a timeline, move cursor into Timeline window.
When nil, cursor will remain in the current window."
  :group 'org-agenda
  :type 'boolean)

(defcustom org-select-agenda-window t
  "Non-nil means, after creating an agenda, move cursor into Agenda window.
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When nil, cursor will remain in the current window."
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  :group 'org-agenda
  :type 'boolean)

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(defcustom org-fit-agenda-window t
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  "Non-nil means, change window size of agenda to fit content."
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  :group 'org-agenda
  :type 'boolean)

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(defcustom org-agenda-show-all-dates t
  "Non-nil means, `org-agenda' shows every day in the selected range.
When nil, only the days which actually have entries are shown."
  :group 'org-agenda
  :type 'boolean)

;; FIXME: First day of month works only for current month because it would
;; require a variable ndays treatment.
(defcustom org-agenda-start-on-weekday 1
  "Non-nil means, start the overview always on the specified weekday.
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0 Denotes Sunday, 1 denotes Monday etc.
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When nil, always start on the current day."
  :group 'org-agenda
  :type '(choice (const :tag "Today" nil)
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		 (const :tag "First day of month" t)
		 (number :tag "Weekday No.")))
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(defcustom org-agenda-ndays 7
  "Number of days to include in overview display."
  :group 'org-agenda
  :type 'number)

(defcustom org-agenda-include-all-todo t
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  "Non-nil means, the agenda will always contain all TODO entries.
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When nil, date-less entries will only be shown if `org-agenda' is called
with a prefix argument.
When non-nil, the TODO entries will be listed at the top of the agenda, before
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the entries for specific days."
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  :group 'org-agenda
  :type 'boolean)

(defcustom org-agenda-include-diary nil
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  "If non-nil, include in the agenda entries from the Emacs Calendar's diary."
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  :group 'org-agenda
  :type 'boolean)

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(defcustom org-calendar-to-agenda-key [?c]
  "The key to be installed in `calendar-mode-map' for switching to the agenda.
The command `org-calendar-goto-agenda' will be bound to this key.  The
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default is the character `c' because then`c' can be used to switch back and
force between agenda and calendar."
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  :group 'org-agenda
  :type 'sexp)
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(defcustom org-agenda-sorting-strategy '(time-up category-keep priority-down)
  "Sorting structure for the agenda items of a single day.
This is a list of symbols which will be used in sequence to determine
if an entry should be listed before another entry.  The following
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symbols are recognized.
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time-up         Put entries with time-of-day indications first, early first
time-down       Put entries with time-of-day indications first, late first
category-keep   Keep the default order of categories, corresponding to the
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		sequence in `org-agenda-files'.
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category-up     Sort alphabetically by category, A-Z.
category-down   Sort alphabetically by category, Z-A.
priority-up     Sort numerically by priority, high priority last.
priority-down   Sort numerically by priority, high priority first.

The different possibilities will be tried in sequence, and testing stops
if one comparison returns a \"not-equal\".  For example, the default
    '(time-up category-keep priority-down)
means: Pull out all entries having a specified time of day and sort them,
in order to make a time schedule for the current day the first thing in the
agenda listing for the day.  Of the entries without a time indication, keep
the grouped in categories, don't sort the categories, but keep them in
the sequence given in `org-agenda-files'.  Within each category sort by
priority.

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Leaving out `category-keep' would mean that items will be sorted across
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categories by priority."
  :group 'org-agenda
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  :type '(repeat
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	  (choice
	   (const time-up)
	   (const time-down)
	   (const category-keep)
	   (const category-up)
	   (const category-down)
	   (const priority-up)
	   (const priority-down))))
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(defcustom org-agenda-prefix-format "  %-12:c%?-12t% s"
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  "Format specification for the prefix of items in the agenda buffer.
This format works similar to a printf format, with the following meaning:

  %c   the category of the item, \"Diary\" for entries from the diary, or
       as given by the CATEGORY keyword or derived from the file name.
  %t   the time-of-day specification if one applies to the entry, in the
       format HH:MM
  %s   Scheduling/Deadline information, a short string

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All specifiers work basically like the standard `%s' of printf, but may
contain two additional characters:  A question mark just after the `%' and
a whitespace/punctuation character just before the final letter.

If the first character after `%' is a question mark, the entire field
will only be included if the corresponding value applies to the
current entry.  This is useful for fields which should have fixed
width when present, but zero width when absent.  For example,
\"%?-12t\" will result in a 12 character time field if a time of the
day is specified, but will completely disappear in entries which do
not contain a time.

If there is punctuation or whitespace character just before the final
format letter, this character will be appended to the field value if
the value is not empty.  For example, the format \"%-12:c\" leads to
\"Diary: \" if the category is \"Diary\".  If the category were be
empty, no additional colon would be interted.

The default value of this option is \"  %-12:c%?-12t% s\", meaning:
- Indent the line with two space characters
- Give the category in a 12 chars wide field, padded with whitespace on
  the right (because of `-').  Append a colon if there is a category
  (because of `:').
- If there is a time-of-day, put it into a 12 chars wide field.  If no
  time, don't put in an empty field, just skip it (because of '?').
- Finally, put the scheduling information and append a whitespace.

As another example, if you don't want the time-of-day of entries in
the prefix, you could use:

  (setq org-agenda-prefix-format \"  %-11:c% s\")

See also the variable `org-agenda-remove-times-when-in-prefix'."
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  :type 'string
  :group 'org-agenda)

(defcustom org-timeline-prefix-format "  % s"
  "Like `org-agenda-prefix-format', but for the timeline of a single file."
  :type 'string
  :group 'org-agenda)

(defvar org-prefix-format-compiled nil
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  "The compiled version of the most recently used prefix format.
Depending on which command was used last, this may be the compiled version
of `org-agenda-prefix-format' or `org-timeline-prefix-format'.")

(defcustom org-agenda-use-time-grid t
  "Non-nil means, show a time grid in the agenda schedule.
A time grid is a set of lines for specific times (like every two hours between
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8:00 and 20:00.  The items scheduled for a day at specific times are
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sorted in between these lines.
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For deails about when the grid will be shown, and what it will look like, see
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the variable `org-agenda-time-grid'."
  :group 'org-agenda
  :type 'boolean)

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(defcustom org-agenda-time-grid
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  '((daily today require-timed)
    "----------------"
    (800 1000 1200 1400 1600 1800 2000))

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  "The settings for time grid for agenda display.
This is a list of three items.  The first item is again a list.  It contains
symbols specifying conditions when the grid should be displayed:

 daily         if the agenda shows a single day
 weekly        if the agenda shows an entire week
 today         show grid on current date, independent of daily/weekly display
 require-timed show grid only if at least on item has a time specification

The second item is a string which will be places behing the grid time.

The third item is a list of integers, indicating the times that should have
a grid line."
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  :group 'org-agenda
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  :type
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  '(list
    (set :greedy t :tag "Grid Display Options"
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	 (const :tag "Show grid in single day agenda display" daily)
	 (const :tag "Show grid in weekly agenda display" weekly)
	 (const :tag "Always show grid for today" today)
	 (const :tag "Show grid only if any timed entries are present"
		require-timed)
	 (const :tag "Skip grid times already present in an entry"
		remove-match))
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    (string :tag "Grid String")
    (repeat :tag "Grid Times" (integer :tag "Time"))))

(defcustom org-agenda-remove-times-when-in-prefix t
  "Non-nil means, remove duplicate time specifications in agenda items.
When the format `org-agenda-prefix-format' contains a `%t' specifier, a
time-of-day specification in a headline or diary entry is extracted and
placed into the prefix.  If this option is non-nil, the original specification
\(a timestamp or -range, or just a plain time(range) specification like
11:30-4pm) will be removed for agenda display.  This makes the agenda less
cluttered.
The option can be t or nil.  It may also be the symbol `beg', indicating
that the time should only be removed what it is located at the beginning of
the headline/diary entry."
  :group 'org-agenda
  :type '(choice
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	  (const :tag "Always" t)
	  (const :tag "Never" nil)
	  (const :tag "When at beginning of entry" beg)))
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(defcustom org-sort-agenda-notime-is-late t
  "Non-nil means, items without time are considered late.
This is only relevant for sorting.  When t, items which have no explicit
time like 15:30 will be considered as 24:01, i.e. later than any items which
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do have a time.  When nil, the default time is before 0:00.  You can use this
option to decide if the schedule for today should come before or after timeless
agenda entries."
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  :group 'org-agenda
  :type 'boolean)

(defgroup org-structure nil
  "Options concerning structure editing in Org-mode."
  :tag "Org Structure"
  :group 'org)

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(defcustom org-cycle-hook '(org-optimize-window-after-visibility-change)
  "Hook that is run after `org-cycle' has changed the buffer visibility.
The function(s) in this hook must accept a single argument which indicates
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the new state that was set by the most recent `org-cycle' command.  The
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argument is a symbol.  After a global state change, it can have the values
`overview', `content', or `all'.  After a local state change, it can have
the values `folded', `children', or `subtree'."
  :group 'org-structure
  :type 'hook)

(defcustom org-occur-hook '(org-first-headline-recenter)
  "Hook that is run after `org-occur' has constructed a sparse tree.
This can be used to recenter the window to show as much of the structure
as possible."
  :group 'org-structure
  :type 'hook)

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(defcustom org-adapt-indentation t
  "Non-nil means, adapt indentation when promoting and demoting.
When this is set and the *entire* text in an entry is indented, the
indentation is increased by one space in a demotion command, and
decreased by one in a promotion command.  If any line in the entry
body starts at column 0, indentation is not changed at all."
  :group 'org-structure
  :type 'boolean)

(defcustom org-cycle-emulate-tab t
  "Where should `org-cycle' emulate TAB.
nil    Never
white  Only in completely white lines
t      Everywhere except in headlines"
  :group 'org-structure
  :type '(choice (const :tag "Never" nil)
		 (const :tag "Only in completely white lines" white)
		 (const :tag "Everywhere except in headlines" t)
		 ))

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(defcustom org-show-following-heading t
  "Non-nil means, show heading following match in `org-occur'.
When doing an `org-occur' it is useful to show the headline which
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follows the match, even if they do not match the regexp.  This makes it
easier to edit directly inside the sparse tree.  However, if you use
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org-occur mainly as an overview, the following headlines are
unnecessary clutter."
  :group 'org-structure
  :type 'boolean)

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(defcustom org-archive-location "%s_archive::"
  "The location where subtrees should be archived.
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This string consists of two parts, separated by a double-colon.
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The first part is a file name - when omitted, archiving happens in the same
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file.  %s will be replaced by the current file name (without directory part).
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Archiving to a different file is useful to keep archived entries from
contributing to the Org-mode Agenda.

The part after the double colon is a headline.  The archived entries will be
filed under that headline.  When omitted, the subtrees are simply filed away
at the end of the file, as top-level entries.

Here are a few examples:
\"%s_archive::\"
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	If the current file is Projects.org, archive in file
	Projects.org_archive, as top-level trees.  This is the default.
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\"::* Archived Tasks\"
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	Archive in the current file, under the top-level headline
	\"* Archived Tasks\".
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\"~/org/archive.org::\"
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	Archive in file ~/org/archive.org (absolute path), as top-level trees.
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\"basement::** Finished Tasks\"
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	Archive in file ./basement (relative path), as level 3 trees
	below the level 2 heading \"** Finished Tasks\".
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You may set this option on a per-file basis by adding to the buffer a
line like
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#+ARCHIVE: basement::** Finished Tasks"
  :group 'org-structure
  :type 'string)

(defcustom org-archive-mark-done t
  "Non-nil means, mark archived entries as DONE."
  :group 'org-structure
  :type 'boolean)

(defcustom org-archive-stamp-time t
  "Non-nil means, add a time stamp to archived entries.
The time stamp will be added directly after the TODO state keyword in the
first line, so it is probably best to use this in combinations with
`org-archive-mark-done'."
  :group 'org-structure
  :type 'boolean)
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(defgroup org-link nil
  "Options concerning links in Org-mode."
  :tag "Org Link"
  :group 'org)

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(defcustom org-link-format "<%s>"
  "Default format for linkes in the buffer.
This is a format string for printf, %s will be replaced by the link text.
If you want to make sure that your link is always properly terminated,
include angle brackets into this format, like \"<%s>\".  Some people also
recommend an additional URL: prefix, so the format would be \"<URL:%s>\"."
  :group 'org-link
  :type '(choice
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	  (const :tag "\"%s\"   (e.g. http://www.there.com)" "%s")
	  (const :tag "\"<%s>\"  (e.g. <http://www.there.com>)" "<%s>")
	  (const :tag "\"<URL:%s>\"  (e.g. <URL:http://www.there.com>)" "<URL:%s>")
	  (string :tag "Other" :value "<%s>")))
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(defcustom org-allow-space-in-links t
  "Non-nil means, file names in links may contain space characters.
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When nil, it becomes possible to put several links into a line.
Note that in tables, a link never extends accross fields, so in a table
it is always possible to put several links into a line.
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Changing this varable requires a re-launch of Emacs of become effective."
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  :group 'org-link
  :type 'boolean)

(defcustom org-line-numbers-in-file-links t
  "Non-nil means, file links from `org-store-link' contain line numbers.
The line number will be added to the file name with :NNN and interpreted
by the command `org-open-at-point'.
Using a prefix arg to the command \\[org-store-link] (`org-store-link')
negates this setting for the duration of the command."
  :group 'org-link
  :type 'boolean)

(defcustom org-keep-stored-link-after-insertion nil
  "Non-nil means, keep link in list for entire session.

The command `org-store-link' adds a link pointing to the current
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location to an internal list.  These links accumulate during a session.
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The command `org-insert-link' can be used to insert links into any
Org-mode file (offering completion for all stored links).  When this
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option is nil, every link which has been inserted once using \\[org-insert-link]
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will be removed from the list, to make completing the unused links
more efficient."
  :group 'org-link
  :type 'boolean)

(defcustom org-link-frame-setup
  '((vm . vm-visit-folder-other-frame)
    (gnus . gnus-other-frame)
    (file . find-file-other-window))
  "Setup the frame configuration for following links.
When following a link with Emacs, it may often be useful to display
this link in another window or frame.  This variable can be used to
set this up for the different types of links.
For VM, use any of
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    `vm-visit-folder'
    `vm-visit-folder-other-frame'
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For Gnus, use any of
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    `gnus'
    `gnus-other-frame'
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For FILE, use any of
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    `find-file'
    `find-file-other-window'
    `find-file-other-frame'
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For the calendar, use the variable `calendar-setup'.
For BBDB, it is currently only possible to display the matches in
another window."
  :group 'org-link
  :type '(list
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	  (cons (const vm)
		(choice
		 (const vm-visit-folder)
		 (const vm-visit-folder-other-window)
		 (const vm-visit-folder-other-frame)))
	  (cons (const gnus)
		(choice
		 (const gnus)
		 (const gnus-other-frame)))
	  (cons (const file)
		(choice
		 (const find-file)
		 (const find-file-other-window)
		 (const find-file-other-frame)))))
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(defcustom org-usenet-links-prefer-google nil
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  "Non-nil means, `org-store-link' will create web links to google groups.
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When nil, Gnus will be used for such links.
Using a prefix arg to the command \\[org-store-link] (`org-store-link')
negates this setting for the duration of the command."
  :group 'org-link
  :type 'boolean)

(defcustom org-open-non-existing-files nil
  "Non-nil means, `org-open-file' will open non-existing file.
When nil, an error will be generated."
  :group 'org-link
  :type 'boolean)

(defcustom org-confirm-shell-links t
  "Non-nil means, ask for confirmation before executing shell links.
The default is true, to keep new users from shooting into their own foot."
  :group 'org-link
  :type 'boolean)

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(defconst org-file-apps-defaults-gnu
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  '((t        . emacs)
    ("jpg"    . "xv %s")
    ("gif"    . "xv %s")
    ("ppm"    . "xv %s")
    ("pgm"    . "xv %s")
    ("pbm"    . "xv %s")
    ("tif"    . "xv %s")
    ("png"    . "xv %s")
    ("ps"     . "gv %s")
    ("ps.gz"  . "gv %s")
    ("eps"    . "gv %s")
    ("eps.gz" . "gv %s")
    ("dvi"    . "xdvi %s")
    ("mpeg"   . "plaympeg %s")
    ("mp3"    . "plaympeg %s")
    ("fig"    . "xfig %s")
    ("pdf"    . "acroread %s")
    ("doc"    . "soffice %s")
    ("ppt"    . "soffice %s")
    ("pps"    . "soffice %s")
    ("html"   . "netscape -remote openURL(%s,new-window)")
    ("htm"    . "netscape -remote openURL(%s,new-window)")
    ("xs"     . "soffice %s"))
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  "Default file applications on a UNIX/LINUX system.
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See `org-file-apps'.")

(defconst org-file-apps-defaults-macosx
  '((t        . "open %s")
    ("ps"     . "gv %s")
    ("ps.gz"  . "gv %s")
    ("eps"    . "gv %s")
    ("eps.gz" . "gv %s")
    ("dvi"    . "xdvi %s")
    ("fig"    . "xfig %s"))
  "Default file applications on a MacOS X system.
The system \"open\" is known as a default, but we use X11 applications
for some files for which the OS does not have a good default.
See `org-file-apps'.")

(defconst org-file-apps-defaults-windowsnt
  '((t        . (w32-shell-execute "open" file)))
  "Default file applications on a Windows NT system.
The system \"open\" is used for most files.
See `org-file-apps'.")

(defcustom org-file-apps
  '(
    ("txt" . emacs)
    ("tex" . emacs)
    ("ltx" . emacs)
    ("org" . emacs)
    ("el"  . emacs)
    )
  "External applications for opening `file:path' items in a document.
Org-mode uses system defaults for different file types, but
you can use this variable to set the application for a given file
extension.  The entries in this list are cons cells with a file extension
and the corresponding command.  Possible values for the command are:
 `emacs'     The file will be visited by the current Emacs process.
 `default'   Use the default application for this file type.
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 string      A command to be executed by a shell; %s will be replaced
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	     by the path to the file.
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 sexp        A Lisp form which will be evaluated.  The file path will
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	     be available in the Lisp variable `file'.
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For more examples, see the system specific constants
`org-file-apps-defaults-macosx'
`org-file-apps-defaults-windowsnt'
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`org-file-apps-defaults-gnu'."
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  :group 'org-link
  :type '(repeat
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	  (cons (string :tag "Extension")
		(choice :value ""
		 (const :tag "Visit with Emacs" 'emacs)
		 (const :tag "Use system default" 'default)
		 (string :tag "Command")
		 (sexp :tag "Lisp form")))))
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(defgroup org-remember nil
  "Options concerning interaction with remember.el."
  :tag "Org Remember"
  :group 'org)

(defcustom org-directory "~/org"
  "Directory with org files.
This directory will be used as default to prompt for org files.
Used by the hooks for remember.el."
  :group 'org-remember
  :type 'directory)

(defcustom org-default-notes-file "~/.notes"
  "Default target for storing notes.
Used by the hooks for remember.el.  This can be a string, or nil to mean
the value of `remember-data-file'."
  :group 'org-remember
  :type '(choice
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	  (const :tag "Default from remember-data-file" nil)
	  file))
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(defcustom org-reverse-note-order nil
  "Non-nil means, store new notes at the beginning of a file or entry.
When nil, new notes will be filed to the end of a file or entry."
  :group 'org-remember
  :type '(choice
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	  (const :tag "Reverse always" t)
	  (const :tag "Reverse never" nil)
	  (repeat :tag "By file name regexp"
		  (cons regexp boolean))))
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(defgroup org-table nil
  "Options concerning tables in Org-mode."
  :tag "Org Table"
  :group 'org)

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(defcustom org-enable-table-editor 'optimized
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  "Non-nil means, lines starting with \"|\" are handled by the table editor.
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When nil, such lines will be treated like ordinary lines.

When equal to the symbol `optimized', the table editor will be optimized to
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do the following
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- Use automatic overwrite mode in front of whitespace in table fields.
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  This make the structure of the table stay in tact as long as the edited
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  field does not exceed the column width.
- Minimize the number of realigns.  Normally, the table is aligned each time
  TAB or RET are pressed to move to another field.  With optimization this
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  happens only if changes to a field might have  changed the column width.
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Optimization requires replacing the functions `self-insert-command',
`delete-char', and `backward-delete-char' in Org-mode buffers, with a
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slight (in fact: unnoticeable) speed impact for normal typing.  Org-mode is
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very good at guessing when a re-align will be necessary, but you can always
force one with `C-c C-c'.

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If you would like to use the optimized version in Org-mode, but the
un-optimized version in OrgTbl-mode, see the variable `orgtbl-optimized'.
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This variable can be used to turn on and off the table editor during a session,
but in order to toggle optimization, a restart is required."
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  :group 'org-table
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  :type '(choice
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	  (const :tag "off" nil)
	  (const :tag "on" t)
	  (const :tag "on, optimized" optimized)))
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(defcustom org-table-default-size "5x2"
  "The default size for newly created tables, Columns x Rows."
  :group 'org-table
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   :type 'string)
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(defcustom org-table-automatic-realign t
  "Non-nil means, automatically re-align table when pressing TAB or RETURN.
When nil, aligning is only done with \\[org-table-align], or after column
removal/insertion."
  :group 'org-table
  :type 'boolean)

(defcustom org-table-spaces-around-separators '(1 . 1)
  "The number of spaces to be placed before and after separators."
  :group 'org-table
  :type '(cons (number :tag "Before \"|\"") (number :tag " After \"|\"")))

(defcustom org-table-spaces-around-invisible-separators '(1 . 2)
  "The number of spaces to be placed before and after separators.
This option applies when the column separators have been made invisible."
  :group 'org-table
  :type '(cons (number :tag "Before \"|\"") (number :tag " After \"|\"")))

(defcustom org-table-number-regexp "^[<>]?[-+^.0-9]*[0-9][-+^.0-9eEdDx()%]*$"
  "Regular expression for recognizing numbers in table columns.
If a table column contains mostly numbers, it will be aligned to the
right.  If not, it will be aligned to the left.

The default value of this option is a regular expression which allows
anything which looks remotely like a number as used in scientific
context.  For example, all of the following will be considered a
number:
    12    12.2    2.4e-08    2x10^12    4.034+-0.02    2.7(10)  >3.5

Other options offered by the customize interface are more restrictive."
  :group 'org-table
  :type '(choice
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	  (const :tag "Positive Integers"
		 "^[0-9]+$")
	  (const :tag "Integers"
		 "^[-+]?[0-9]+$")
	  (const :tag "Floating Point Numbers"
		 "^[-+]?\\([0-9]*\\.[0-9]+\\|[0-9]+\\.[0-9]*\\)$")
	  (const :tag "Floating Point Number or Integer"
		 "^[-+]?\\([0-9]*\\.[0-9]+\\|[0-9]+\\.?[0-9]*\\)$")
	  (const :tag "Exponential, Floating point, Integer"
		 "^[-+]?[0-9.]+\\([eEdD][-+0-9]+\\)?$")
	  (const :tag "Very General Number-Like"
		 "^[<>]?[-+^.0-9]*[0-9][-+^.0-9eEdDx()%]*$")
	  (string :tag "Regexp:")))
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(defcustom org-table-number-fraction 0.5
  "Fraction of numbers in a column required to make the column align right.
In a column all non-white fields are considered.  If at least this
fraction of fields is matched by `org-table-number-fraction',
alignment to the right border applies."
  :group 'org-table
  :type 'number)

(defcustom org-export-highlight-first-table-line t
  "Non-nil means, highlight the first table line.
In HTML export, this means use <th> instead of <td>.
In tables created with table.el, this applies to the first table line.
In Org-mode tables, all lines before the first horizontal separator
line will be formatted with <th> tags."
  :group 'org-table
  :type 'boolean)

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(defcustom org-table-tab-recognizes-table.el t
  "Non-nil means, TAB will automatically notice a table.el table.
When it sees such a table, it moves point into it and - if necessary -
calls `table-recognize-table'."
  :group 'org-table
  :type 'boolean)

;; FIXME: Should this one be in another group?  Which one?
(defcustom org-enable-fixed-width-editor t
  "Non-nil means, lines starting with \":\" are treated as fixed-width.
This currently only means, they are never auto-wrapped.
When nil, such lines will be treated like ordinary lines."
  :group 'org-table
  :type 'boolean)
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(defgroup org-table-calculation nil
  "Options concerning tables in Org-mode."
  :tag "Org Table Calculation"
  :group 'org)

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(defcustom org-table-copy-increment t
  "Non-nil means, increment when copying current field with \\[org-table-copy-down]."
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  :group 'org-table-calculation
  :type 'boolean)

(defcustom org-calc-default-modes
  '(calc-internal-prec 12
    calc-float-format  (float 5)
    calc-angle-mode    deg
    calc-prefer-frac   nil
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    calc-symbolic-mode nil
    calc-date-format (YYYY "-" MM "-" DD " " Www (" " HH ":" mm))
    calc-display-working-message t
    )
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  "List with Calc mode settings for use in calc-eval for table formulas.
The list must contain alternating symbols (calc modes variables and values.
Don't remove any of the default settings, just change the values.  Org-mode
relies on the variables to be present in the list."
  :group 'org-table-calculation
  :type 'plist)

(defcustom org-table-formula-evaluate-inline t
  "Non-nil means, TAB and RET evaluate a formula in current table field.
If the current field starts with an equal sign, it is assumed to be a formula
which should be evaluated as described in the manual and in the documentation
string of the command `org-table-eval-formula'.  This feature requires the
Emacs calc package.
When this variable is nil, formula calculation is only available through
the command \\[org-table-eval-formula]."
  :group 'org-table-calculation
  :type 'boolean)


(defcustom org-table-formula-use-constants t
  "Non-nil means, interpret constants in formulas in tables.
A constant looks like `$c' or `$Grav' and will be replaced before evaluation
by the value given in `org-table-formula-constants', or by a value obtained
from the `constants.el' package."
  :group 'org-table-calculation
  :type 'boolean)

(defcustom org-table-formula-constants nil
  "Alist with constant names and values, for use in table formulas.
The car of each element is a name of a constant, without the `$' before it.
The cdr is the value as a string.  For example, if you'd like to use the
speed of light in a formula, you would configure

  (setq org-table-formula-constants '((\"c\" . \"299792458.\")))

and then use it in an equation like `$1*$c'."
  :group 'org-table-calculation
  :type '(repeat
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	  (cons (string :tag "name")
		(string :tag "value"))))
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(defcustom org-table-formula-numbers-only nil
  "Non-nil means, calculate only with numbers in table formulas.
Then all input fields will be converted to a number, and the result
must also be a number.  When nil, calc's full potential is available
in table calculations, including symbolics etc."
  :group 'org-table-calculation
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  :type 'boolean)

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(defcustom org-table-allow-automatic-line-recalculation t
  "Non-nil means, lines makred with |#| or |*| will be recomputed automatically.
Automatically means, when TAB or RET or C-c C-c are pressed in the line."
  :group 'org-table-calculation
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  :type 'boolean)

(defgroup org-export nil
  "Options for exporting org-listings."
  :tag "Org Export"
  :group 'org)

(defcustom org-export-language-setup
  '(("en"  "Author"          "Date"  "Table of Contents")
    ("da"  "Ophavsmand"      "Dato"  "Indhold")
    ("de"  "Autor"           "Datum" "Inhaltsverzeichnis")
    ("es"  "Autor"           "Fecha" "\xccndice")
    ("fr"  "Auteur"          "Date"  "Table des Mati\xe8res")
    ("it"  "Autore"          "Data"  "Indice")
    ("nl"  "Auteur"          "Datum" "Inhoudsopgave")
    ("nn"  "Forfattar"       "Dato"  "Innhold")  ;; nn = Norsk (nynorsk)
    ("sv"  "F\xf6rfattarens" "Datum" "Inneh\xe5ll"))
  "Terms used in export text, translated to different languages.
Use the variable `org-export-default-language' to set the language,
or use the +OPTION lines for a per-file setting."
  :group 'org-export
  :type '(repeat
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	  (list
	   (string :tag "HTML language tag")
	   (string :tag "Author")
	   (string :tag "Date")
	   (string :tag "Table of Contents"))))
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(defcustom org-export-default-language "en"
  "The default language of HTML export, as a string.
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This should have an association in `org-export-language-setup'"
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  :group 'org-export
  :type 'string)

(defcustom org-export-headline-levels 3
  "The last level which is still exported as a headline.
Inferior levels will produce itemize lists when exported.
Note that a numeric prefix argument to an exporter function overrides
this setting.

This option can also be set with the +OPTIONS line, e.g. \"H:2\"."
  :group 'org-export
  :type 'number)

(defcustom org-export-with-section-numbers t
  "Non-nil means, add section numbers to headlines when exporting.

This option can also be set with the +OPTIONS line, e.g. \"num:t\"."
  :group 'org-export
  :type 'boolean)

(defcustom org-export-with-toc t
  "Non-nil means, create a table of contents in exported files.
The TOC contains headlines with levels up to`org-export-headline-levels'.

Headlines which contain any TODO items will be marked with \"(*)\" in
ASCII export, and with red color in HTML output.

In HTML output, the TOC will be clickable.

This option can also be set with the +OPTIONS line, e.g. \"toc:nil\"."
  :group 'org-export
  :type 'boolean)

(defcustom org-export-preserve-breaks nil
  "Non-nil means, preserve all line breaks when exporting.
Normally, in HTML output paragraphs will be reformatted.  In ASCII
export, line breaks will always be preserved, regardless of this variable.

This option can also be set with the +OPTIONS line, e.g. \"\\n:t\"."
  :group 'org-export
  :type 'boolean)

(defcustom org-export-html-inline-images t
  "Non-nil means, inline images into exported HTML pages.
The link will still be to the original location of the image file.
So if you are moving the page, lets say to your public HTML site,
you will have to move the image and maybe change the link."
  :group 'org-export
  :type 'boolean)

(defcustom org-export-html-expand t
  "Non-nil means, for HTML export, treat @<...> as HTML tag.
When nil, these tags will be exported as plain text and therefore
not be interpreted by a browser.

This option can also be set with the +OPTIONS line, e.g. \"@:nil\"."
  :group 'org-export
  :type 'boolean)

(defcustom org-export-with-fixed-width t
  "Non-nil means, lines starting with \":\" will be in fixed width font.
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This can be used to have pre-formatted text, fragments of code etc.  For
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example
  : ;; Some Lisp examples
  : (while (defc cnt)
  :   (ding))
will be looking just like this in also HTML.  In ASCII export, this option
has no effect.

This option can also be set with the +OPTIONS line, e.g. \"::nil\"."
  :group 'org-export
  :type 'boolean)

(defcustom org-export-with-tables t
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  "If non-nil, lines starting with \"|\" define a table.
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For example:

  | Name        | Address  | Birthday  |
  |-------------+----------+-----------|
  | Arthur Dent | England  | 29.2.2100 |

In ASCII export, this option has no effect.

This option can also be set with the +OPTIONS line, e.g. \"|:nil\"."
  :group 'org-export
  :type 'boolean)

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(defcustom org-export-prefer-native-exporter-for-tables nil
  "Non-nil means, always export tables created with table.el natively.
Natively means, use the HTML code generator in table.el.
When nil, Org-mode's own HTML generator is used when possible (i.e. if
the table does not use row- or column-spanning).  This has the
advantage, that the automatic HTML conversions for math symbols and
sub/superscripts can be applied.  Org-mode's HTML generator is also
much faster."
  :group 'org-export
  :type 'boolean)

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(defcustom org-export-html-table-tag
  "<table border=1 cellspacing=0 cellpadding=6>"
  "The HTML tag used to start a table.
This must be a <table> tag, but you may change the options like
borders and spacing."
  :group 'org-export
  :type 'string)

(defcustom org-export-with-emphasize t
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  "Non-nil means, interpret *word*, /word/, and _word_ as emphasized text.
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If the export target supports emphasizing text, the word will be
typeset in bold, italic, or underlined, respectively.  Works only for
single words, but you can say: I *really* *mean* *this*.
In ASCII export, this option has no effect.

This option can also be set with the +OPTIONS line, e.g. \"*:nil\"."
  :group 'org-export
  :type 'boolean)

(defcustom org-match-sexp-depth 3
  "Number of stacked braces for sub/superscript matching.
This has to be set before loading org.el to be effective."
  :group 'org-export
  :type 'integer)

;; FIXME: Should () parens be removed as well in sub/superscripts?
(defcustom org-export-with-sub-superscripts t
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  "Non-nil means, interpret \"_\" and \"^\" for export.
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When this option is turned on, you can use TeX-like syntax for sub- and
superscripts.  Several characters after \"_\" or \"^\" will be
considered as a single item - so grouping with {} is normally not
needed.  For example, the following things will be parsed as single
sub- or superscripts.

 10^24   or   10^tau     several digits will be considered 1 item
 10^-12  or   10^-tau    a leading sign with digits or a word
 x^2-y^3                 will be read as x^2 - y^3, because items are
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			 terminated by almost any nonword/nondigit char.
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 x_{i^2} or   x^(2-i)    braces or parenthesis do grouping.

Still, ambiguity is possible - so when in doubt use {} to enclose the
sub/superscript.
In ASCII export, this option has no effect.

This option can also be set with the +OPTIONS line, e.g. \"^:nil\"."
  :group 'org-export
  :type 'boolean)

(defcustom org-export-with-TeX-macros t
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  "Non-nil means, interpret simple TeX-like macros when exporting.
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For example, HTML export converts \\alpha to &alpha; and \\AA to &Aring;.
No only real TeX macros will work here, but the standard HTML entities
for math can be used as macro names as well.  For a list of supported
names in HTML export, see the constant `org-html-entities'.
In ASCII export, this option has no effect.

This option can also be set with the +OPTIONS line, e.g. \"TeX:nil\"."
  :group 'org-export
  :type 'boolean)

(defcustom org-export-html-with-timestamp nil
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  "If non-nil, write `org-export-html-html-helper-timestamp'
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into the exported html text.  Otherwise, the buffer will just be saved
to a file."
  :group 'org-export
  :type 'boolean)

(defcustom org-export-html-html-helper-timestamp
  "<br><br><hr><p><!-- hhmts start --> <!-- hhmts end -->\n"
  "The HTML tag used as timestamp delimiter for HTML-helper-mode."
  :group 'org-export
  :type 'string)

(defcustom org-export-ascii-show-new-buffer t
  "Non-nil means, popup buffer containing the exported ASCII text.
Otherwise the buffer will just be saved to a file and stay hidden."
  :group 'org-export
  :type 'boolean)

(defcustom org-export-html-show-new-buffer nil
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  "Non-nil means,  popup buffer containing the exported html text.
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Otherwise, the buffer will just be saved to a file and stay hidden."
  :group 'org-export
  :type 'boolean)

(defgroup org-faces nil
  "Faces for highlighting in Org-mode."
  :tag "Org Faces"
  :group 'org)

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(defface org-level-1 ;; font-lock-function-name-face
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  '((((type tty) (class color)) (:foreground "blue" :weight bold))
    (((class color) (background light)) (:foreground "Blue"))
    (((class color) (background dark)) (:foreground "LightSkyBlue"))
    (t (:inverse-video t :bold t)))
  "Face used for level 1 headlines."
  :group 'org-faces)