Remove mailing list prefix from issue titles.

[Worg.git] / org-faq.org

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#+EMAIL:     carsten.dominik@gmail.com
#+AUTHOR:    Worg people
#+LANGUAGE:  en
#+TITLE:     Org-mode Frequently Asked Questions
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<a href="/"><img src="http://orgmode.org/img/org-mode-unicorn.png" class="logo-link" /></a>
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[[file:index.org][{Back to Worg's index}]]

* Welcome
  :PROPERTIES:
  :CUSTOM_ID: Welcome
  :END:

Welcome to the Org-mode FAQ.

You can navigate the FAQ by clicking on any of the topics in the Table
of Contents.

If your browser supports JavaScript, you can...

- move through the topics by typing "=n=" (next) and "=p=" (previous).

- see an outline view of the FAQ by typing "=m=" or clicking "=toggle
  view=" (above).

- search the FAQ by typing "=s=" (basic search) or "=o=" (occur tree).

- see a full list of navigation commands by typing "=?=" or clicking
  "=Help=" (above).

* What is org-mode?
  :PROPERTIES:
  :CUSTOM_ID: What-is-org-mode
  :END:
** Can I implement a GTD workflow with Org-mode?
   :PROPERTIES:
   :CUSTOM_ID: GTD-workflow-with-Org-mode
   :END:

   Yes, you can.  Check for discussions and pointers [[http://orgmode.org/worg/org-gtd-etc.php][here]].

** What is the difference between Org and TaskPaper?
   :PROPERTIES:
   :CUSTOM_ID: Org-and-TaskPaper
   :END:

  There is really no difference.  Org is as /simple/ as [[http://hogbaysoftware.com/products/taskpaper][TaskPaper]].  It
  is just that, when using Org within Emacs, it lets you do many things
  that you wouldn't be able to do with TaskPaper.  Yes, TaskPaper is
  fiddle-proof and people using Emacs tends to like fiddling (which is
  orthogonal to the idea of using todo-list efficiently), but this is
  just a matter of discipline and common sense, not one of Org's design.

  Read [[http://article.gmane.org/gmane.emacs.orgmode/6224][Carsten's enlightening statement]] on this.
** What is the meaning of the Unicorn on Org's website?
   :PROPERTIES:
   :CUSTOM_ID: unicorn
   :END:

The Unicorn is the logo of Org-mode because:

- Org-mode is the UNICs of ORgaNizers.

- Org-mode is an Emacs mode, so it makes sense to use an animal
  similar or related to the gnu used for GNU Emacs.

- Org-mode is meant to show you the way, and an animal with two horns
  can not do this very well, can it?

- Unicorn tears are said to reverse petrification, and wasn't this how
  we all felt before getting to some degree of time and task
  management?

- It will take forever to learn everything there is to know about a
  unicorn.

- A unicorn is a fabulous creature.  Org-mode wants to be a fabulous
  creation.

Using a unicorn was originally /Bastien Guerry's/ idea, his friend
/Christophe Bataillon/ designed the logo for us, and /Greg Newman/
gave it a refresh some time later.  Bastien writes why he chose a
unicorn:

#+BEGIN_QUOTE
The first reason is not linked to the animal, but to the sounding of the
word "Unicorn" - because Org gives you a /uni/que way of producing files
in several format (HTML, LaTeX, etc.)

The second reason is that a Unicorn doesn't really exist, it is just
something you can dream about, and make others believe it does exist.
Just like the perfect organizer.
#+END_QUOTE

There was a [[http://thread.gmane.org/gmane.emacs.orgmode/11641/focus%3D11641][thread about unicorns]] on the mailing list.  [[http://thread.gmane.org/gmane.emacs.orgmode/11641/focus%3D11641][Christopher
Suckling]] posted a link showing how to make a simple foldable unicorn
(very appropriate for an outlining program!).

[[http://article.gmane.org/gmane.emacs.orgmode/11735][Tim Burt]] made a very complicated one which is now a treasured
possession of the Org-mode author.

- Official logo: [[http://orgmode.org/img/org-mode-unicorn.png]]
  This logo is available in a number of different formats including
  Photoshop /.psd/ and scaleable vector graphics /.svg/ [[http://orgmode.org/img/][here]].

- An [[http://orgmode.org/img/nrocinu4.jpg][alternative version]] from Christophe Bataillon (c):

- [[http://article.gmane.org/gmane.emacs.orgmode/14293][Chris Randle]] made a [[http://orgmode.org/img/nrocinu.txt][text version]] using the logo and [[http://glassgiant.com][glassgiant.com]]:

- [[http://article.gmane.org/gmane.emacs.orgmode/14362][Stefan Vollmar]] made a [[http://orgmode.org/img/nrocinu.pdf][pdf version]] (here in [[http://orgmode.org/img/nrocinu_pdf.png][png]]) using "a simple
  threshold technique".

- [[http://article.gmane.org/gmane.emacs.orgmode/11735/match%3D][Tim Burt]] made a folded Unicorn to match the spirit of Org - see the
  whole set of pictures [[http://www.flickr.com/photos/tcburt/sets/72157614543357071/][on his flickr page]].

- Are unicorns real?  Answer [[http://article.gmane.org/gmane.emacs.orgmode/11687/match%3Drosslaird%2Bunicorn][here]] by Ross Laird.

* Mailing list
** Why hasn't my email to the mailing list shown up yet?
   :PROPERTIES:
   :CUSTOM_ID: ml-post-delay
   :END:

The org-mode mailing list is moderated. Thus, if you are not
subscribed to the mailing list, your mail will only appear on the list
after it has been approved by a moderator. To ensure that your mail
appears quickly, please [[http://lists.gnu.org/mailman/listinfo/emacs-orgmode][subscribe to the list]].

** I read the mailing list through gmane. Should I subscribe?
   :PROPERTIES:
   :CUSTOM_ID: ml-subscription-and-gmane
   :END:

The org-mode mailing list is available via nntp at [[http://dir.gmane.org/gmane.emacs.orgmode][Gmane]]. Many
participants in the list prefer read the list in a newsreader, such as
Gnus, instead of receiving emails. If you choose to read the list via
nntp, you can still [[http://lists.gnu.org/mailman/listinfo/emacs-orgmode][subscribe]] to the list and then opt not to receive
any emails on the mailman settings page (see the "Mail Delivery"
setting).

This will ensure that your messages to the list get through quickly,
reduce the work load of the mailing list moderators (who need to clear
every mail from non-members), and provide more accurate information
about the number of list readers.

* Keeping current
  :PROPERTIES:
  :CUSTOM_ID: Keeping-current
  :END:
** How do I keep current with Org mode development?
   :PROPERTIES:
   :CUSTOM_ID: keeping-current-with-Org-mode-development
   :END:

   Org mode is developed in [[http://en.wikipedia.org/wiki/Git_(software)][Git]].  You can keep up-to-date with Org
   mode developement by cloning Org mode repository and refreshing
   your copy with latest changes whenever you wish.  You only need to
   use two Git commands (clone and pull.)  Here are the steps in
   brief (please customize locations to suit your setup):

   1. Select a location to house the Org mode repository (approx. 40
      MB; includes documentation, compiled elisp files and history
      going all the way back to v4.12a)

      : $ mkdir $HOME/elisp && cd $HOME/elisp

   2. Clone the Org mode Git repository.

      Recommended approach:

      : $ git clone git://repo.or.cz/org-mode.git

      Alternate approach if you are behind a firewall that allows only
      HTTP (can be quite slow):

      : $ git clone http://repo.or.cz/r/org-mode.git

   3. Compile and install Org mode and build documentation.

      : $ cd org-mode && make && make doc && make install

      Please note that you can choose to /not/ compile at all and run
      using source =.el= files only.  Compiled files speed things up.

   4. This is where you configure Org mode with Emacs.  Please refer
      to [[./org-tutorials/index.org][Org tutorials]].

   5. Keeping up-to-date.

      Cloning the repository is a one time activity.  From this point
      onwards you only need to /pull/ the latest changes.

      : $ cd $HOME/elisp/org-mode

      and then

      : $ git pull && make clean && make && make doc && make install

   6. You should restart org mode to have the changes take effect (if
      you are not rebooting Emacs.)  Also since the intention is to
      "keep up" with Org mode, you should visit ChangeLog and updated
      sections of documentation for latest updates (use =git log=.)

   7. As you use your repository over time it will accumulate loose objects.
      You can reduce the total size of your git repository with

      : $ git gc

      which will consolidate loose git objects into pack files.  This
      reduces the size of the repository and speeds up data access to
      the objects.

** How can I keep local changes and still track Org mode development?
   :PROPERTIES:
   :CUSTOM_ID: keeping-local-changes-current-with-Org-mode-development
   :END:

  Say you want to make minor changes to the Makefile to reflect your
  location for =emacs=.

  Create a local branch for your changes on top of origin/master as
  follows:

  : $ git checkout -b local origin/master
  : $ git config branch.local.rebase true
  : # Make your changes to the Makefile and create a new commit
  : $ git add Makefile
  : $ git commit -m 'My local Makefile configurations'
  : # Update git to a newer version
  : $ git pull

  Now each time you pull new commits from the distribution repository
  your local commits will be rewound and replayed on top of the new
  origin/master.

-----------

  You would normally work on your =local= branch which includes your
  custom commits; there's no need to switch back to the =master=
  branch.

-----------

Here is an example of dealing with conflict resolution during git pull.

If you get a conflict during a =git pull= you will need to edit the
file with the conflict to fix up the conflicting lines and then tell
git that you have resolved the conflict.

Conflict resolution goes something like this:

1. =git pull= fails with a conflict
2. edit the file
3. =git add= the file to mark the conflict resolved
4. =git rebase --continue=
5. lather, rinse, and repeat 2-4 as needed

For this example we have the following Makefile:

: #
: # Example Makefile
: #
:
: EMACS=emacs
:
: VERSION=V1.0

and we need to change the =EMACS=emacs= line to =EMACS=myemacs= to
make it work well on our system.

To do this we

  - create a local branch for our work

    : $ git checkout -b local origin/master
    : $ git config branch.local.rebase true

    This marks the branch so that all local commits on it are rebased
    on top of any new commits we get in origin/master during a =git
    pull= operation.

  - Make our custom changes

    Edit the makefile so it looks like this:

    : #
    : # Example Makefile
    : #
    :
    : EMACS=myemacs
    :
    : VERSION=V1.0

  - Create a commit with our custom changes
    : $ git add Makefile
    : $ git commit -m 'My local Makefile configurations'

  - Later we do a =git pull= but that fails with conflicts.

    : $ git pull
    : remote: Counting objects: 5, done.
    : ...
    : Patch failed at 0001.
    :
    : When you have resolved this problem run "git rebase --continue".
    : If you would prefer to skip this patch, instead run "git rebase --skip".
    : To restore the original branch and stop rebasing run "git rebase --abort".

  - Fix the conflict in your favourite editor

    Conflict markers look like this:

    : <<<<<<< HEAD:Makefile
    : EMACS=emacs22
    : =======
    : EMACS=myemacs
    : >>>>>>> Change emacs location:Makefile

    This attempted =git pull= caused a conflict.  Fire up your
    favourite editor and fix the conflict in the Makefile.  The
    conflict markers are <<<<<<<<<< , ======= , and >>>>>>>>>>.  Fix
    the Makefile appropriately and delete the conflict markers.  You
    already edited these lines earlier so fixing it should be trivial.

    In this case we changed =EMACS=emacs= to =EMACS=myemacs= and
    upstream changed =EMACS=emacs= to =EMACS=emacs22=.  Just fix the
    file and save it by deleting the conflict markers and keeping the
    code you need (in this case the =EMACS=myemacs= line which we
    originally modified.)

  - Mark the file's conflict resolved

    : $ git add Makefile

    You use =git add= because you are adding new content to be tracked - you're not adding a file, but you are adding changes in content.

  - Continue the rebase operation

    : $ git rebase --continue

    If any other conflicts arise you fix them the same way - edit the file, mark the conflict resolved, and continue.

At anytime during the rebase conflict resolution you can say "oops this is all wrong - put it back the way it was before I did a pull"
using
: $ git rebase --abort

** How can I install an up-to-date version of org-mode without "make" tools?
   :PROPERTIES:
   :CUSTOM_ID: installing-org-without-make-tools
   :END:

If you are using org-mode on a computer that lacks developer tools for
compiling software, such as [[http://www.gnu.org/software/make/][GNU Make]], you will have to use a
*different* installation method than [[http://orgmode.org/manual/Installation.html#Installation][the one outlined in the manual]].

Please see [[http://article.gmane.org/gmane.emacs.orgmode/15264][this thread]] on the mailing list for several different ways
you can install a recent version of org-mode without using the
customary =make clean && make && make install=.

The result of that discussion is the file/function found in
[[http://orgmode.org/worg/org-hacks.php#compiling-org-without-make]].

* Setup
  :PROPERTIES:
  :CUSTOM_ID: Setup
  :END:

** How can I quickly browse all Org options?

=M-x org-customize RET=

See also [[file:org-tutorials/org-customize.org][Carsten's Org customize tutorial]] and [[file:org-configs/org-customization-guide.org][this customization guide]]
for details.

** Can I use the editing features of org-mode in other modes?
   :PROPERTIES:
   :CUSTOM_ID: use-editing-features-in-other-modes
   :END:

   Not really---but there are a few editing features you can use in
   other modes.

   - For tables there is =orgtbl-mode= which implements the table
     editor as a minor mode. (To enable, type =M-x orgtbl-mode=)
   - For ordered lists there is =orgstuct-mode= which allows for easy
     list editing as a minor mode. (To enable, type =M-x
     orgstruct-mode=)

   You can activate these modes automatically by using hooks:

   : (add-hook 'mail-mode-hook 'turn-on-orgtbl)
   : (add-hook 'mail-mode-hook 'turn-on-orgstruct)

   For footnotes, there is the function =org-footnote-action=, which
   works in non-org buffers. This function is a powerful tool for
   creating and sorting footnotes. To use it globally, you can add the
   following keybinding to your =.emacs= file (requires Org 6.17 or
   greater):

   : (global-set-key (kbd "C-c f") 'org-footnote-action)

   For other features you need to switch to Org-mode temporarily, or
   prepare text in a different buffer.

** Why isn't feature "X" working the way it is described in the manual?
   :PROPERTIES:
   :CUSTOM_ID: making-sure-org-mode-is-up-to-date
   :END:

Org-mode develops very quickly. There have been a great many changes,
for instance, since the release of Emacs 22, which shipped with
version 4.67d of org-mode. (Emacs 23 is expected to ship with version
6.21b.)

Many of the users on the org-mode mailing list are using either a
recent release of org-mode or the
[[http://orgmode.org/index.html#sec-3.2][development version of
org-mode from the git repository]].

If some settings and features aren't working the way you expect, make
sure that the version of the manual you are consulting matches the
version of org-mode you are using.

   - You can check which version of org-mode you are using by
     selection =Org --> Documentation --> Show Version= in the Emacs
     menu.

   - The [[http://orgmode.org/manual/index.html][online manual]] at [[http://orgmode.org][orgmode.org]] corresponds to the most recent
     release.

   - The [[http://www.gnu.org/software/emacs/manual/html_node/org/index.html][manual]] at [[http://www.gnu.org][www.gnu.org]] corresponds to the version of org-mode
     released with the latest official Gnu Emacs release (Emacs 22 and
     org-mode 4.67d as of February 2009). Note: compared with the
     manual at the orgmode.org, the manual at www.gnu.org is
     considerably out of date.

For instructions on how to stay current with org-mode, consult [[keeping-current-with-Org-mode-development][this
FAQ]] or follow the instructions on [[http://orgmode.org][the official org-mode site]].

** Can I get the visibility-cycling features in outline-mode and outline-minor-mode?
   :PROPERTIES:
   :CUSTOM_ID: use-visibility-cycling-in-outline-mode
   :END:

   Yes, these functions are written in a way that they are independent of
   the outline setup.  The following setup provides standard Org-mode
   functionality in outline-mode on =TAB= and =S-TAB=.  For
   outline-minor-mode, we use =C-TAB= instead of =TAB=,
   because =TAB= usually has mode-specific tasks.

#+BEGIN_SRC emacs-lisp
(add-hook 'outline-minor-mode-hook
  (lambda ()
    (define-key outline-minor-mode-map [(control tab)] 'org-cycle)
    (define-key outline-minor-mode-map [(shift tab)] 'org-global-cycle)))
(add-hook 'outline-mode-hook
  (lambda ()
    (define-key outline-mode-map [(tab)] 'org-cycle)
    (define-key outline-mode-map [(shift tab)] 'org-global-cycle)))
#+END_SRC

Or check out /outline-magic.el/, which does this and also provides
promotion and demotion functionality.  /outline-magic.el/ is
available at [[http://www.astro.uva.nl/~dominik/Tools/outline-magic.el][Outline Magic]].

** Can I save/restore the visibility state of an org-mode buffer?

Well, no.

** How can I keep track of changes in my Org files?
   :PROPERTIES:
   :CUSTOM_ID: track-of-changes-in-Org-files
   :END:

  Use git to track the history of the files, use a cronjob to check in
  changes regularly.  Such a setup is described by Bernt Hansen
  in [[http://article.gmane.org/gmane.emacs.orgmode/6233][this message]] on [[http://dir.gmane.org/gmane.emacs.orgmode][emacs-orgmode]].

** Can I use Org-mode as the default mode for all README files?
   :PROPERTIES:
   :CUSTOM_ID: Org-mode-as-default-mode
   :END:

Add the following to your .emacs file:

: (add-to-list 'auto-mode-alist '("README$" . org-mode))

You can even make it the default mode for any files with unspecified
mode using

: (setq default-major-mode 'org-mode)

** Can I use ido.el for completing stuff in Org?
   :PROPERTIES:
   :CUSTOM_ID: ido-complete
   :END:

   Yes, you can.  If you are an ido user and ido-mode is active, the
   following setting will make Org use =ido-completing-read= for most
   of its completing prompts.

: (setq org-completion-use-ido t)

** Should I use one big org file or multiple files?
   :PROPERTIES:
   :CUSTOM_ID: how-to-organize-org-mode-files
   :END:

Org-mode is flexible enough to accomodate a variety of organizational
and time management schemes. Org's
[[http://orgmode.org/manual/Document-Structure.html#Document-Structure][outline
cycling and convenient editing and navigation commands]] make it
possible to maintain all of your projects and notes in a single file.
But org-mode's [[http://orgmode.org/manual/Hyperlinks.html#Hyperlinks][quick and easy hyperlinks]], along with [[http://orgmode.org/manual/Refiling-notes.html#Refiling-notes][easy refiling of
notes and todos]], also make it a delight to maintain a private "wiki"
consisting of multiple files.

No matter how you organize your org files, org-mode's agenda commands
make it easy to search all your notes and gather together crucial data
in a single view.

Moreover, several org-mode settings can be configured either globally
in your =.emacs= file or locally (per file or per outline tree). See
the [[http://orgmode.org/manual/index.html#Top][manual]] for more details. For an example of local customizations
see [[limit-agenda-with-category-match][this FAQ]].

Here are a few ideas for organizing org-mode files:

- A single file for all your projects and notes.
- One file per project.
- One file per client.
- One file per area of responsibility or type of work (e.g.,
  household, health, work, etc.).
- One file for projects, one for appointments, one for reference
  material, one for someday/maybe items, etc.
- A wiki of hyperlinked files that grows and adapts to meet your
  needs.

For more ideas, see some of the links on the [[file:org-tutorials/index.org][org-tutorial index]] or
[[file:org-gtd-etc.org][this page on org-mode and GTD]].

** Why doesn't C-c a call the agenda? Why don't some org keybindings work?
   :PROPERTIES:
   :CUSTOM_ID: setting-global-keybindings
   :END:

Org-mode has a few global keybindings that the user must set
explicitly in an =.emacs= file. These keybindings include the
customary shortcut for calling the agenda (=C-c a=). If nothing
happens when you type =C-c a=, then make sure that the following lines
are in your =.emacs= file:

#+BEGIN_SRC emacs-lisp
;; The following lines are always needed.  Choose your own keys.
(add-to-list 'auto-mode-alist '("\\.org\\'" . org-mode))
(global-set-key "\C-cl" 'org-store-link)
(global-set-key "\C-ca" 'org-agenda)
(global-set-key "\C-cb" 'org-iswitchb)
#+END_SRC emacs-lisp

You may, of course, choose whatever keybindings work best for you
and do not conflict with other modes.

Please see [[http://orgmode.org/manual/Activation.html][this section of the manual]] if you have additional
questions.

** Why aren't some of the variables I've customized having an effect?
   :PROPERTIES:
   :CUSTOM_ID: load-org-after-setting-variables
   :END:

Some org variables have to be set before org.el is loaded or else they
will not work. (An example is the new variable
=org-enforce-todo-dependencies=.)

To make sure all your variables work you should not use =(require
'org)=. Instead use the following setting:

: (require 'org-install)

You should also make sure that you do not require any other =org-...=
files in your =.emacs= file before you have set your org variables,
since these will also cause org.el to be loaded. To be safe, load org
files *after* you have set your variables.

** Org-mode has a lot of colors?  How can I change them?
   :PROPERTIES:
   :CUSTOM_ID: customizing-org-faces
   :END:

This is a question that applies to Emacs as a whole, but it comes up
quite frequently on the org-mode mailing list, so it is appropriate to
discuss it here.

If you would like to change the style of a face in org-mode (or any
other Emacs mode), simply type =M-x customize-face [RET]= while the
cursor is on the color/style you are interested in modifying. You will
be given the opportunity to customize all the faces located at that
point.

If you would like an overview of all the faces in org-mode, you can
type =C-u M-x list-faces-display [RET] org= and you will be shown all
the faces defined by org-mode along with an illustration of their
current settings.

If you would like to customize org-faces and other aspects of
org-appearance, type =M-x customize-group org-font-lock [RET]=.

Finally, if you would like verbose information about the properties of
the text under the cursor, you can type =C-u C-x ==.

See the Worg page on [[file:org-tutorials/org-appearance.org][customizing Org appearance]] for further information.

** How can I make sure that timestamps appear in English?
   :PROPERTIES:
   :CUSTOM_ID: timestamps-and-system-time-locale
   :END:

If your system's locale is not set to English, but you would like the
timestamps in your org-mode files to appear in English, you can set
the following variable:

#+begin_src emacs-lisp
  (setq system-time-locale "C")
#+end_src

** What does a minimal .emacs look like?
Using a stripped down minimal .emacs files removes broken custom
settings as the cause of an issue and makes it easy to reproduce for
other people.  The example below has system-specific paths that you'll
need to change for your own use.
#+begin_src emacs-lisp
  (add-to-list 'load-path (expand-file-name "~/git/org-mode/lisp"))
  (add-to-list 'auto-mode-alist '("\\.\\(org\\  |org_archive\\|txt\\)$" . org-mode))
  (setq org-agenda-files '("/tmp/test.org"))
  (require 'org-install)
  (require 'org-habit)
  
  (global-set-key "\C-cl" 'org-store-link)
  (global-set-key "\C-ca" 'org-agenda)
  (global-set-key "\C-cb" 'org-iswitchb)
#+end_src

You can save the minimal .emacs file to ~/minimal.emacs, add suspect
configuration code to it, then start emacs something like this:
#+begin_src sh
  emacs -Q -l ~/minimal.emacs
#+end_src

On OS X, starting emacs with minimal configuration might look
something like this:
#+begin_src sh 
  /Applications/emacs.app/Contents/MacOS/Emacs -Q -l ~/minimal.emacs
#+end_src sh


* Errors and general problems
  :PROPERTIES:
  :CUSTOM_ID: Errors
  :END:
** Opening Org files in Emacs leads to a crash
   :PROPERTIES:
   :CUSTOM_ID: Emacs-crashes-with-org-indent-mode
   :END:
   The only known case where Org-mode can crash Emacs is when you are
   using =org-indent-mode= with Emacs 23.1 (in fact, any version of
   Emacs before version 23.1.50.3).  Upgrade to Emacs 23.2 and the
   problem should go away.

** When I try to use Org-mode, I always get the error message =(wrong-type-argument keymapp nil)=
   :PROPERTIES:
   :CUSTOM_ID: wrong-type-argument-keymapp
   :END:

   This is a conflict with an outdated version of the /allout.el/, see
   the [[http://orgmode.org/manual/Conflicts.html#Conflicts][Conflicts]] section in the manual

** How can I control the application launched by Org-mode to open a certain file type like pdf, html.... 
   :PROPERTIES:
   :CUSTOM_ID: external-application-launched-to-open-file-link
   :END:

If you want special control about how Org-mode opens files, see the
variables =org-file-apps=, =org-file-apps-defaults-gnu=,
=org-file-apps-defaults-macosx=, =org-file-apps-defaults-windowsnt=.

*However*, normally it is best to just use the mechanism the
operating-system provides:

*** GNU/Linux systems
    You you have to check your mailcap settings, find the files:

    : /etc/mailcap
    : 
    : or  
    : 
    : $HOME/.mailcap

and modify them accordingly. Please read their manual entry.

*** Windows systems 
    + for html pages you may configure the =browse-url-= variables through
      the Customize interface,
    + the pdf files are automatically opened with Acrobat Reader (if it is
      installed)

*** Mac OSX
    Change the application responsible for this file type by selecting
    such a file in the Finder, select =File->Get Info= from the menu
    and select the application to open this file with.  Then, to
    propagate the change to all files with the same extension, select
    the =Change all= button.

** Org-mode takes over the TAB key.  I also want to use YASnippet, is there a way to fix this conflict?
   :PROPERTIES:
   :CUSTOM_ID: YASnippet
   :END:

[[http://code.google.com/p/yasnippet/][yasnippet]] is yet another snippet expansion system for Emacs.  It is
inspired by TextMate's templating syntax.
- watch the [[http://www.youtube.com/watch?v=vOj7btx3ATg][video on YouTube]]
- see the [[http://yasnippet.googlecode.com/svn/trunk/doc/index.html][intro and tutorial]]

*Note*: yasnippet is not compatible with =org-indent-mode= currently
there is no known way to use both successfully with =yas/trigger-key=
set to =TAB= (or =[tab]= etc...)

The way Org-mode binds the =TAB= key (binding to =[tab]= instead of
=\t=) overrules yasnippets' access to this key.  The following code
fixes this problem:

#+begin_src emacs-lisp
(add-hook 'org-mode-hook
          (lambda ()
            (org-set-local 'yas/trigger-key [tab])
            (define-key yas/keymap [tab] 'yas/next-field-group)))
#+end_src

If the above code doesn't work (which it may not with later versions
of yasnippet).  Then try the following

#+begin_src emacs-lisp
  (defun yas/org-very-safe-expand ()
    (let ((yas/fallback-behavior 'return-nil)) (yas/expand)))
  
  (add-hook 'org-mode-hook
            (lambda ()
              ;; yasnippet (using the new org-cycle hooks)
              (make-variable-buffer-local 'yas/trigger-key)
              (setq yas/trigger-key [tab])
              (add-to-list 'org-tab-first-hook 'yas/org-very-safe-expand)
              (define-key yas/keymap [tab] 'yas/next-field)))
#+end_src

Rick Moynihan maintains a [[http://github.com/RickMoynihan/yasnippet-org-mode][git repository]] (or [[http://github.com/eschulte/yasnippet-org-mode][Eric's fork of the same]])
with YASnippets for Org-mode.

** Org-mode takes over the S-cursor keys.  I also want to use CUA-mode, is there a way to fix this conflict?
   :PROPERTIES:
   :CUSTOM_ID: CUA-mode
   :END:

Yes, see the  [[http://orgmode.org/manual/Conflicts.html#Conflicts][Conflicts]] section of the manual.

** Org-mode takes over the S-cursor keys.  I also want to use windmove.el, is there a way to fix this conflict?
   :PROPERTIES:
   :CUSTOM_ID: windmove.el
   :END:

Yes, see the [[http://orgmode.org/manual/Conflicts.html#Conflicts][Conflicts]] section of the manual.

** Org behaves strangely: some keys don't work, some features are missing, my settings have no effect, ...
   :PROPERTIES:
   :CUSTOM_ID: loaded-old-org
   :END:

When this sort of things happen, it probably is because Emacs is loading an old version of Org-mode instead of the one you expected. Check it with =M-x org-version=.

This happens because Emacs loads first the system org-mode (the one included with Emacs) before the one in your directory. Check the =load-path= variable; you might see that your org-mode appears /after/ the system-wide path; this is bad.

You should add your directories to the =load-path= at the beginning:

:  (add-to-list 'load-path "~/.emacs.d/org-mode/lisp") (require 'org-install)

Function =add-to-list= adds at the beginning. Don't use =append= because it appends at the end. Also be sure to use =(require 'org-install)= and not =(require 'org)=.

This wrong version loading may also happen if you have a byte-compiled =org.elc= from an old version together with a new =org.el=. Since Emacs prefers loading byte-compiled files (even if the =.el= is newer), it will load the old Org-mode.

** Why doesn't org-batch-agenda work under Win32?
   :PROPERTIES:
   :CUSTOM_ID: org-batch-agenda-under-win32
   :END:

When I run the example batch files to print my agenda to the console
under Win32 I get the failure:

: End of file during parsing

and no agenda is printed.

The problem is the use of single quotes surrounding the eval in the
emacs command-line. This gets confused under Win32. All string
parameters with spaces must be surrounded in double quotes. This means
that double quotes being passed to the eval must be escaped.

Therefore, instead of the following:

: <path to emacs>\emacs.exe -batch -l ~/_emacs_org \
:     -eval '(org-batch-agenda "a")'

you need to use the following:

:  <path to emacs>\emacs.exe -batch -l ~/_emacs_org \
:     -eval "(org-batch-agenda \"a\")"

(all on one line, of course).

** Org agenda seems very slow
   :PROPERTIES:
   :CUSTOM_ID: slow-agenda
   :END:

If it takes a long time to generate or refresh the agenda, you might
want first check which version of org-mode you are using. There have
been major optimizations of org-agenda since 6.21b, which was the
version of org-mode released with Emacs 23. If you are using 6.21b or
earlier (you can check with =M-x org-version=), then you might want to
consider upgrading to a more recent version of org-mode.

Here are some other ideas for speeding up the agenda:

1. Use a one day agenda view (rather than a seven day view).

   =(setq org-agenda-ndays 1)=

2. Archive inactive items to separate files.
   
   =C-c C-x C-s= (org-archive-subtree)

3. Do not include the global todo list in your agenda view.

   (setq org-agenda-include-all-todo nil)

4. Make sure that your org files are byte-compiled.

   I.e., make sure there are files ending in .elc in your org
   installation directory.

** Visual-line-mode doesn't work well with org-mode
   :PROPERTIES:
   :CUSTOM_ID: visual-line-mode
   :END:

Visual-line-mode "soft wraps" lines so that the visual edge of the
buffer is considered a line break for purposes of navigation, even
though there is no line break in reality. 

In older versions of org-mode, org-beginning-of-line and
org-end-of-line do not work well with visual line mode. (The two
commands disregard soft line breaks and move to the beginning and end
of the hard line break.) A patch was introduces to fix this behavior
in July of 2009. n

If you are using an older version of org mode, you can:

1. Add a hook to turn off visual line mode.

2. Add the following to your =.emacs=:

#+begin_src emacs-lisp

(add-hook 'org-mode-hook
  (lambda ()
    (define-key org-mode-map "\C-a" 'move-beginning-of-line)
    (define-key org-mode-map "\C-e" 'move-end-of-line)))

#+end_src

* Outline
  :PROPERTIES:
  :CUSTOM_ID: Outline
  :END:
** Can I have two windows on the same Org-mode file, with different outline visibilities?
   :PROPERTIES:
   :CUSTOM_ID: indirect-buffers
   :END:

   You may use /indirect buffers/ which do exactly this.  See the
   documentation on the command =make-indirect-buffer=.

   Org-mode has built-in commands that allow you create an indirect
   buffer from a subtree of an outline. To open a subtree in new
   window, type =C-c C-x b=. Any changes you make in the new window
   will be saved to the original file, but the visibility of both
   buffers will remain independent of one another.

   For multiple indirect buffers from the same file, you must use the
   prefix =C-u= when creating the second (or third) buffer. Otherwise
   the new indirect buffer will replace the old.

   You can also create an independent view of an outline subtree by
   typing =b= on an item in the agenda.

** Emacs outlines are unreadable.  Can I get rid of all those stars?
   :PROPERTIES:
   :CUSTOM_ID: Emacs-outlines-are-unreadable
   :END:

   See the section [[http://orgmode.org/manual/Clean-view.html#Clean-view][Clean outline view]] in the manual.
** C-k is killing whole subtrees!  I lost my work!
   :PROPERTIES:
   :CUSTOM_ID: C-k-is-killing-subtrees
   :END:

  =(setq org-special-ctrl-k t)= before losing your work.

** Why aren't commands working on regions?
   :PROPERTIES:
   :CUSTOM_ID: transient-mark-mode
   :END:

Some org-mode commands, such as M-right and M-left for demoting or
promoting headlines (see [[demote-multiple-headlines][this FAQ]]), can be applied to entire regions.
These commands, however, will only work on active regions set with
[[http://www.gnu.org/software/emacs/manual/html_node/emacs/Transient-Mark.html#Transient-Mark][transient mark mode]]. Transient mark mode is enabled by default in
Emacs 23. To enable it in earlier versions of emacs, put the following
in your =.emacs= file:

: (transient-mark-mode 1)

Alternatively, you may turn off transient mark mode and use [[http://www.gnu.org/software/emacs/manual/html_node/emacs/Momentary-Mark.html][a
momentary mark]] (=C-<SPC> C-<SPC>=).

** Why is a blank line inserted after headlines and list items?
   :PROPERTIES:
   :ID:       2463F4D8-F686-4CF3-AA07-08976F8A4972
   :END:
   :PROPERTIES:
   :CUSTOM_ID: blank-line-after-headlines-and-list-items
   :END:

In org-mode, typing =M-RET= at the end of a headline will create a new
headline of the same level on a new line. The same is true for plain
lists. By default org-mode uses context to determine if a blank line
should be inserted after each headline or plain list item when =M-RET=
is pressed. For instance, if a there is a blank line before a
headline, then typing =M-RET= at the end of the line will insert a
blank line before the new headline. For instance, hitting =M-RET=
at the end of "Headline Two" below inserts a new headline without a
blank line:

: ** Headline One
: ** Headline Two
: **

If there is a blank line between Headline One and Headline Two,
however, the results will be as follows:

: ** Headline One
:
: ** Headline Two
:
: **

If you do not like the default behavior you can change it with the
variable =org-blank-before-new-entry=. You can set headings and/or
plain lists to auto (the default setting), t (always), or nil (never).

** How can I promote or demote multiple headlines at once?
   :PROPERTIES:
   :CUSTOM_ID: demote-multiple-headlines
   :END:

If you have a long list of first level headlines that you'd like to
demote to second level headlines, you can select the headlines as a
region and then hit =M-<right>= to demote all the headlines at once.

Note: =M-S-<right>= will not work on a selected region. Its use is to
demote a single subtree (i.e., a headline and all sub-headlines).

If M-<right> doesn't seem to work, make sure transient mark mode is
enabled. See [[transient-mark-mode][this FAQ]].

** What's the deal with all the ellipses in my org outlines?
   :PROPERTIES:
   :CUSTOM_ID: org-ellipses
   :END:

Org-mode uses ellipses to indicate folded (and thus hidden) text. Most
commonly, ellispes occur at the end of headings with folded content:

: * Heading ...

Or, for instance, they may indicate closed drawers:

: :PROPERTIES: ...

Sometimes, as a result of editing and cycling an outline, ellipses may
appear in unexpected places. You should *never* delete these ellipses,
as you may accidentally delete hidden text. Instead, you can type =C-c
C-r= (org-reveal) to display all hidden text in the vicinity. Or you
may type =M-x RET show-all= to reveal all text in the org file.

If you would prefer a symbol or face for indicating hidden text, you
can customize the variable org-ellipses.

** How do I yank a subtree so it's indented according to points' location?
   :PROPERTIES:
   :CUSTOM_ID: yank-indent-subtree
   :END:

You can either use =C-c C-w= with a working [[http://orgmode.org/manual/Refiling-notes.html#Refiling-notes][refile-targets]] setup.

Or set =org-yank-adjusted-subtrees= to =t= which will adjust the
yanked headline's level correctly.

Just use =C-k= and =C-y= as you would everywhere else in Emacs.

** Can I read org-mode outlines in vim?
   :PROPERTIES:
   :CUSTOM_ID: org-outlines-in-vim
   :END:

Yes, there is a script that enables one to view and navigate folded
outline/org files in vim (though without most of org-mode's
functionality, of course).

  - [[http://www.vim.org/scripts/script.php?script_id%3D1266][Emacs outline mode - Imitates Emacsen : vim online]]

For instructions on how to set it up, please see [[http://mid.gmane.org/EA275862-B97A-4BAC-B879-177FD07A2D56@gaillourdet.net][this mailing list
post]].

* Todos and Tags
  :PROPERTIES:
  :CUSTOM_ID: Todos-and-Tags
  :END:
** How can I cycle through the TODO keyword of an entry?
   :PROPERTIES:
   :CUSTOM_ID: cycle-TODO-keywords
   :END:

  =C-c C-t= or =S-<left/right>= is what you need.

** How do I track state changes for tasks in Org?
   :PROPERTIES:
   :CUSTOM_ID: track-state-changes-for-tasks
   :END:

  Take a look at the [[http://thread.gmane.org/gmane.emacs.orgmode/6082][post by Bernt Hansen]] for setting up TODO keyword
  states and logging timestamps for task state changes.

** Can I select the TODO keywords with a tag-like interface?
   :PROPERTIES:
   :CUSTOM_ID: select-TODO-keywords-with-tag-like-interface
   :END:

  Yes.  Use =(setq org-use-fast-todo-selection t)=

  If you want to set both your todos and your tags using a single
  interface, then check out the variable
  =org-fast-tag-selection-include-todo=.

  See [[http://orgmode.org/manual/Fast-access-to-TODO-states.html][this section of the manual]] for more details.

** How can I quickly set the tag of an entry?
   :PROPERTIES:
   :CUSTOM_ID: quickly-set-tag-of-entry
   :END:

   Use =C-c C-c= or =C-c C-q= on the headline. =C-c C-q= is useful for
   setting tabs in a [[http://orgmode.org/manual/Remember.html#Remember][remember]] buffer, since =C-c C-c= is the default
   keybinding for filing a note from the remember buffer.

   You can set tags even more quickly by setting one of the character
   shortcuts for [[http://orgmode.org/manual/Setting-tags.html#Setting-tags][fast tag selection]].

   To set tag shortcuts for all org buffers, put something like the
   following in your =.emacs= file (or create the same settings by
   typing =M-x customize-variable RET org-tag-alist=):

: (setq org-tag-alist '(("computer" . ?c) ("office" . ?o) ("home" . ?h)))

   To set tag shortcuts for a single buffer, put something like the
   following at the top of your org file:

: #+TAGS: computer(c) office(o) home(h)

** How can I change the colors of TODO keywords?

You can use the variable org-todo-keyword-faces. Here are some sample
settings:

#+begin_src emacs-lisp
(setq org-todo-keyword-faces
      '(
        ("TODO"  . (:foreground "firebrick2" :weight bold))
        ("WAITING"  . (:foreground "olivedrab" :weight bold))
        ("LATER"  . (:foreground "sienna" :weight bold))
        ("PROJECT"  . (:foreground "steelblue" :weight bold))
        ("DONE"  . (:foreground "forestgreen" :weight bold))
        ("MAYBE"  . (:foreground "dimgrey" :weight bold))
        ("CANCELED"  . shadow)
        ))
#+end_src

If you want to change the color of all active todos or all inactive
todos, type:

: M-x customize-face RET org-todo
: M-x customize-face RET org-done

You can also set values for each of these in your =.emacs= file:

: (set-face-foreground 'org-todo "firebrick2")
: (set-face-foreground 'org-done "forestgreen")

* Hyperlinks
  :PROPERTIES:
  :CUSTOM_ID: Hyperlinks
  :END:
** Why do I have to confirm the execution of each shell/elisp link?
   :PROPERTIES:
   :CUSTOM_ID: confirm-shell/elisp-link
   :END:

   The confirmation is there to protect you from unwantingly execute
   potentially dangerous commands.  For example, imagine a link

   : [[shell:rm -rf ~/*][Google Search]]

   In an Org-mode buffer, this command would look like /Google Search/,
   but really it would remove your home directory.  If you wish, you can
   make it easier to respond to the query by setting

   : (setq org-confirm-shell-link-function 'y-or-n-p
   :       org-confirm-elisp-link-function 'y-or-n-p).

   Then a single keypress will be enough to confirm those links.  It is
   also possible to turn off this check entirely, but I strongly
   recommend against this.  Be warned.

** Can I use RET or TAB to follow a link?
   :PROPERTIES:
   :CUSTOM_ID: RET-or-TAB-to-follow-link
   :END:

   Yes, this is how:

   : (setq org-return-follows-link t)
   : (setq org-tab-follows-link t)

** Can I keep mouse-1 clicks from following a link?
   :PROPERTIES:
   :CUSTOM_ID: mouse-1-following-link
   :END:

   Activating links with =mouse-1= is a new feature in Emacs 22, to make
   link behavior similar to other applications like web browsers.  If
   you hold the mouse button down a bit longer, the cursor will be set
   without following the link.  If you cannot get used to this behavior,
   you can (as in Emacs 21) use =mouse-2= to follow links and turn off
   link activation for =mouse-1= with

   : (setq org-mouse-1-follows-link nil)

** How can I get completion of file names when creating a link?
   :PROPERTIES:
   :CUSTOM_ID: completion-of-file-links
   :END:

You can use org-insert-link with a prefix argument:

: C-u C-c C-l

You will be greeted with prompt in the minibuffer that allows for file
completion using your preferred Emacs method for finding files.

* Plain Lists
  :PROPERTIES:
  :CUSTOM_ID: Plain-Lists
  :END:
** How can I insert an empty line before each newly inserted headline, but not before each newly inserted plain-list item?
   :PROPERTIES:
   :CUSTOM_ID: empty-line-before-each-new-headline-but-not-item
   :END:

: (setq org-blank-before-new-entry
:       '((heading . t) (plain-list-item . nil))

See also [[id:2463F4D8-F686-4CF3-AA07-08976F8A4972][Why is a blank line inserted after headlines and list items?]].

** How can I convert itemized lists to enumerated lists?
   :PROPERTIES:
   :CUSTOM_ID: convert-itemized-to-enumerated-lists
   :END:

   You can use =C-c -= or =S-<left>/<right>= to cycle through the various
   bullet headlines available for lists: =-, +, *, 1., 1)=.

   See [[http://orgmode.org/manual/Plain-lists.html#Plain-lists][this section of the manual]] for more information.

** How can I convert plain lists to headlines and vice versa?
   :PROPERTIES:
   :CUSTOM_ID: convert-plain-lists-to-headlines
   :END:

   To convert a plain list item or line to a headline, type =C-c *= on
   the headline. This will make the line a subheading of the current
   headline.

   To convert a headline to a plain list item, type =C-c -= while the
   cursor is on the headline.

   To convert a headline to an unadorned line of text, type =C-c *= on
   the headline.

   You can use query replace to accomplish the same things, as Bernt
   Hansen explains in [[http://article.gmane.org/gmane.emacs.orgmode/10148][this mailing list post]].

** Is there a good way to create a description list?
   :PROPERTIES:
   :CUSTOM_ID: description-lists
   :END:

  Yes, these are now built-in:

#+BEGIN_EXAMPLE
- item1 :: Description of this item 1
- item2 :: Description of this item 2
- item1 :: Description of this item 3
      also in multiple lines
#+END_EXAMPLE

* Tables
  :PROPERTIES:
  :CUSTOM_ID: Tables
  :END:
** Can I plot data from a table?
   :PROPERTIES:
   :CUSTOM_ID: plotting-table-data
   :END:

   Yes, you can, using org-plot.el written by James TD Smith and now
   bundled with Org.  See [[http://orgmode.org/manual/Org-Plot.html#Org-Plot][the manual section about this]].

   See also [[file:org-tutorials/org-plot.org][this excellent tutorial]] by Eric Schulte.

** How can I fill a table column with incremental numbers?
   :PROPERTIES:
   :CUSTOM_ID: fill-table-column-with-incremental-numbers
   :END:

Here is how: Use a field formula to set the first value in the column:

#+begin_src org
,| N   |   |
,|-----+---|
,| :=1 |   |
,|     |   |
,|     |   |
,|     |   |
,#+TBLFM: @2$1=1
#+end_src

Then define a column formula in the second field:

#+begin_src org
,| N        |   |
,|----------+---|
,| 1        |   |
,| =@-1 + 1 |   |
,|          |   |
,|          |   |
,#+TBLFM: @2$1=1
#+end_src

After recomputing the table, the column will be filled with
incremental numbers:

#+begin_src org
,| N |   |
,|---+---|
,| 1 |   |
,| 2 |   |
,| 3 |   |
,| 4 |   |
,#+TBLFM: $1=@-1 + 1::@2$1=1
#+end_src

Note that you could use arbitrary starting values and column formulas.

** Why does my table column get filled with #ERROR?
   :PROPERTIES:
   :CUSTOM_ID: table-column-filled-with-ERROR
   :END:

   Org-mode tried to compute the column from other fields using a
   formula stored in the =#+TBLFM:= line just below the table, and
   the evaluation of the formula fails.  Fix the fields used in the
   formula, or fix the formula, or remove it!

** How can I stop the table editor from creating new lines?
   :PROPERTIES:
   :CUSTOM_ID: table-editor-creates-new-lines
   :END:

   When I am in the last column of a table and just above a horizontal
   line in the table, pressing TAB creates a new table line before the
   horizontal line.  To move to the line below the
   horizontal line instead, do this:

   Press =down= (to get on the separator line) and then =TAB=.
   Or configure the variable

   : (setq org-table-tab-jumps-over-hlines t)

** How can I get table fields starting with "="?
   :PROPERTIES:
   :CUSTOM_ID: table-fields-starting-with-=
   :END:

   With the setting

   : (setq org-table-formula-evaluate-inline nil)

   this will no longer happen.  You can still use formulas using the
   commands @<tt>C-c =@</tt> and @<tt>C-u C-c =@</tt>

** How can I change the indentation of an entire table without fixing every line by hand?
   :PROPERTIES:
   :CUSTOM_ID: change-indentation-entire-table
   :END:

   The indentation of a table is set by the first line.  So just fix the
   indentation of the first line and realign with =TAB=.

** In my huge table the realigning after each TAB takes too long.  What can I do?
   :PROPERTIES:
   :CUSTOM_ID: table-realigning-after-TAB-takes-long
   :END:

   Either split the table into several by inserting an empty line every
   100 lines or so.  Or turn off the automatic re-align with

   : (setq org-table-automatic-realign nil)

   After this the only way to realign a table is to press =C-c C-c=.  It
   will no longer happen automatically, removing the corresponding delays
   during editing.

** Recalculation of my table takes too long.  What can I do?
   :PROPERTIES:
   :CUSTOM_ID: Recalculation-of-my-table-takes-too-long
   :END:

   Nothing, really.  The spreadsheet in org is mostly done to make
   calculations possible, not so much to make them fast.  Since Org-mode
   is firmly committed to the ASCII format, nothing is stopping you from
   editing the table by hand.  Therefore, there is no internal
   representation of the data.  Each time Org-mode starts a computation,
   it must scan the table for special lines, find the fields etc.  This
   is slow.  Furthermore, Calc is slow compared to hardware
   computations.  To make this work with normal editing, recalculation
   is not happening automatically, or only for the current line, so that
   the long wait for a full table iteration only happens when you ask
   for it.

   So for really complex tables, moving to a "real" spreadsheet may
   still be the best option.

   That said, there are some ways to optimize things in Org-mode, and I
   have been thinking about moving a bit further down this line.
   However, for my applications this has so far not been an issue at
   all.  If you have a good case, you could try to convince me.

** =S-RET= in a table keeps increasing the copied numbers.  How can I stop this?
   :PROPERTIES:
   :CUSTOM_ID: S-RET-in-a-table-increases-copied-numbers
   :END:

   Well, it is /supposed/ to be a feature, to make it easy to create a
   column with increasing numbers.  If this gets into your way, turn it
   off with

   : (setq org-org-table-copy-increment nil)

** When I export tables to html, they don't have borders.
   :PROPERTIES:
   :CUSTOM_ID: table-borders-in-html-export
   :END:

By default, org mode exports tables without borders.

You can changed this by placing an =#+ATTR_HTML= line before the
table:

:  #+ATTR_HTML: border="2" rules="all" frame="all"

See [[http://orgmode.org/manual/Tables-in-HTML-export.html#Tables-in-HTML-export][the manual]] for more details.

** Why does the Calc high precision (e. g. =p20=) not work like expected?
   :PROPERTIES:
   :CUSTOM_ID: table-high-precision
   :END:

- *Short answer*

  Avoid
  : | 0.16666667000000 |
  : #+TBLFM: $1 = 1 / 2 * 3; p20 %.14f
  and use
  : | 0.16666666666667 |
  : #+TBLFM: $1 = 1 / 2 * 3; p20 f14

- *Longer answer*

  It is important to distinguish between the precision of
  1) =p20=: Calc internal calculation (=calc-internal-prec=)
  2) =f14=: Calc float formatting, unlimited in precision (=calc-float-format=)
  3) =%.14f=: the =printf= reformatting, limited in precision

  See [[http://orgmode.org/manual/Formula-syntax-for-Calc.html#Formula-syntax-for-Calc][the Org manual]] (org-version 6.35 or newer) for more details.

  Use =C-h v org-calc-default-modes RET= to check the Org default settings
  which are used if no format specifiers are added to a table formula.
  The examples below have been made with the out_of_the_box Org defaults
  =calc-internal-prec = 12= and =calc-float-format = 8=.

  Remember the formula debugger, toggled with =C-c {=,
  to view the processing stages like:
  |   | formula debugger label | processing stage           |
  | / | <                      | <>                         |
  |---+------------------------+----------------------------|
  |   | Result:                | output of Calc             |
  |   | Format:                | reformatting with =printf= |

  Following are some examples to demonstrate
  the interaction of the three precisions.

  - *display precision limitations for Calc formulas*
    - limited by Calc internal calculation precision from Org default
      (here =p12=)
      : | 0.16666666666700 |
      : #+TBLFM: $1 = 1 / 2 * 3;     f14

      : | 0.1666666666670000000 |
      : #+TBLFM: $1 = 1 / 2 * 3;     f19

    - limited by Calc float format from Org default (here =f8=)
      : | 0.16666667 |
      : #+TBLFM: $1 = 1 / 2 * 3

      : | 0.16666667 |
      : #+TBLFM: $1 = 1 / 2 * 3; p20

      : | 0.16666667000000 |
      : #+TBLFM: $1 = 1 / 2 * 3;         %.14f

      : | 0.16666667000000 |
      : #+TBLFM: $1 = 1 / 2 * 3; p20     %.14f

    - limited by Calc float format specified
      : | 0.166667 |
      : #+TBLFM: $1 = 1 / 2 * 3;     f6

      : | 0.16666666666667 |
      : #+TBLFM: $1 = 1 / 2 * 3; p20 f14

      : | 0.1666666666666666667 |
      : #+TBLFM: $1 = 1 / 2 * 3; p20 f19

    - limited by =printf= conversion to Emacs Lisp float
      : | 0.1666666699999999900 | the inaccuracy is platform dependent |
      : #+TBLFM: $1 = 1 / 2 * 3;         %.19f

      : | 0.1666666699999999900 | the inaccuracy is platform dependent |
      : #+TBLFM: $1 = 1 / 2 * 3; p20     %.19f

      : | 0.1666666666666666600 | the inaccuracy is platform dependent |
      : #+TBLFM: $1 = 1 / 2 * 3; p20 f20 %.19f

    - limited by =printf= format specified
      : | 0.166667 |
      : #+TBLFM: $1 = 1 / 2 * 3;         %.6f

  - *display precision limitations for Emacs Lisp formulas*
    - limited by Emacs Lisp float
      : | 0.16666666666666666 |
      : #+TBLFM: $1 = '(/ 1.0 (* 2 3))

      : | 0.1666666666666666574 | the inaccuracy is platform dependent |
      : #+TBLFM: $1 = '(/ 1.0 (* 2 3)); %.19f

    - limited by =printf= format specified
      : | 0.16666666666667 |
      : #+TBLFM: $1 = '(/ 1.0 (* 2 3)); %.14f

This FAQ entry is based on this [[http://thread.gmane.org/gmane.emacs.orgmode/22642][mailing list thread]]
and is continued in the [[#table-float-fraction][next FAQ entry]].

** Which float format shows the fraction part also when the latter is zero?
   :PROPERTIES:
   :CUSTOM_ID: table-float-fraction
   :END:

- *Short answer*

  Avoid
  : | 1 |
  : #+TBLFM: $1 = 1 + 0; f3
  and use
  : | 1.000 |
  : #+TBLFM: $1 = 1 + 0; %.3f

- *Longer answer*

  For =f3= and =f-3= see =`d f' (`calc-fix-notation')= in [[http://www.delorie.com/gnu/docs/calc/calc.html#SEC_Top][the Calc manual]]
  in the section Mode Settings -> Display Modes -> Float Formats
  [[http://www.delorie.com/gnu/docs/calc/calc_163.html][found here as long as the section numbering is kept]].

  Remember the formula debugger, toggled with =C-c {=,
  to view the processing stages like:
  |   | formula debugger label | processing stage           |
  | / | <                      | <>                         |
  |---+------------------------+----------------------------|
  |   | Result:                | output of Calc             |
  |   | Format:                | reformatting with =printf= |

  Following are some examples to demonstrate different float formats.

  - normal precision
    : |----------------------+---------+-------+-------|
    : | number               |      f3 |   f-3 |  %.3f |
    : |----------------------+---------+-------+-------|
    : | 1 + 0                |       1 |     1 | 1.000 |
    : | 0 + 0                |       0 |     0 | 0.000 |
    : |----------------------+---------+-------+-------|
    : | 1 + 1 / 2 * 3 * 1000 |   1.000 | 1.000 | 1.000 |
    : | 0 + 1 / 2 * 3 * 1000 | 1.67e-4 | 0.000 | 0.000 |
    : |----------------------+---------+-------+-------|
    : | 1 + 1 / 2 * 3 *  100 |   1.002 | 1.002 | 1.002 |
    : | 0 + 1 / 2 * 3 *  100 |   0.002 | 0.002 | 0.002 |
    : |----------------------+---------+-------+-------|
    : #+TBLFM: $2 = $1; f3 :: $3 = $1; f-3 :: $4 = $1; %.3f

  - high precision
    : |----------------------+--------------------------+-----------------------|
    : | number               |                      f19 |                  f-19 |
    : |----------------------+--------------------------+-----------------------|
    : | 1 + 0                |                        1 |                     1 |
    : | 0 + 0                |                        0 |                     0 |
    : |----------------------+--------------------------+-----------------------|
    : | 1 + 1 / 2 * 3 * 1e19 |    1.0000000000000000000 | 1.0000000000000000000 |
    : | 0 + 1 / 2 * 3 * 1e19 | 1.666666666666666667e-20 | 0.0000000000000000000 |
    : |----------------------+--------------------------+-----------------------|
    : | 1 + 1 / 2 * 3 * 1e18 |    1.0000000000000000002 | 1.0000000000000000002 |
    : | 0 + 1 / 2 * 3 * 1e18 |    0.0000000000000000002 | 0.0000000000000000002 |
    : |----------------------+--------------------------+-----------------------|
    : #+TBLFM: $2 = $1; p20 f19 :: $3 = $1; p20 f-19

    The =printf= reformatting (=%.19f=) cannot be used with high precision,
    see the [[#table-high-precision][previous FAQ entry]].

* Markup
  :PROPERTIES:
  :CUSTOM_ID: Footnotes
  :END:
** How can I get automatic renumbering of footnotes in org-mode?
   :PROPERTIES:
   :CUSTOM_ID:       footnote-auto-adjust
   :END:

You can add the following line to your .emacs file:

: (setq org-footnote-auto-adjust t)

Or, if you prefer, you can turn this option on locally by placing the
following line at the top of your org file:

: #+STARTUP: fnadjust

When auto-adjust is turned on, footnotes in the file with numerical
labels will be renumbered whenever a new footnote is added. Meanwhile,
all footnotes, including those with custom labels such
=[fn:custom-label ]=, will be sorted in the order of their appearance
in the text.

This emulates the footnote behavior that many users may be familiar
with from word-processing programs or from the footnote-mode included
with emacs.

If you do not turn on org-footnote-auto-adjust, you sort and/or
renumber footnotes at any time by calling org-footnote-action with a
prefix argument.

** Why isn't auto renumbering of footnotes turned on by default?
   :PROPERTIES:
   :CUSTOM_ID:       why-no-default-auto-adjust
   :END:

Org mode has a very robust footnote mechanism allowing for a variety
of types of footnotes. With some of the following footnote notations,
auto-adjust may be either irrelevant or undesired:

 - Automatically numbered
 - Footnotes with custom labels
 - Inline footnotes

In addition, org mode can be customized to place footnotes either at
the end of a document or at the end of the outline heading in which
they appear. Users who change this setting while editing a document
may be disconcerted to find all of their footnotes rearranged
automatically.

** I have auto-fill-mode set and org-mode is inserting unwanted comment markers!
   :PROPERTIES:
   :CUSTOM_ID: auto-fill-and-unwanted-comments
   :END:

If the following occurs:

#+begin_src org

#+OPTIONS: toc:nil
Some entered text.
# More entered tex.

#+end_src

Make sure that the variable comment-start is nil.

** Are there any shortcuts for entering source blocks and comment lines?
   :PROPERTIES:
   :CUSTOM_ID: shortcuts-for-entering-source-blocks
   :END:

Org mode has some [[http://orgmode.org/manual/Literal-examples.html#Literal-examples][very convenient markup]] for including literal blocks
and lines of code in a file. (This is especially useful when exporting
documents or using the contributed package [[file:org-contrib/babel/index.org][org-babel]] for executing
blocks of code.)

#+begin_src org
  ,#+begin_src perl
  ,  print "Hello, world!\n";
  ,#+end_src
#+end_src

It can be tiresome to enter the block comment lines manually. There
are several possible shortcuts you can use to enter them:

1) Built-in expansion

   - Org mode has a "secret" method of expanding source code blocks
     and comment lines.

   - If you type "<s" followed by =TAB= or =M-TAB=, a source block will
     magically appear.

   - For a full list of expansions, type =M-x describe-variable
     [RET] org-structure-template-alist=.

2) [[http://orgmode.org/manual/Literal-examples.html#Literal-examples][Registers]]

   - Add the following line to your emacs file:

     =(set-register ?p "#+begin_src\n\n#+end_src perl")=

   - Then type =C-x r i p= to insert the source block. Please note: if
     you save another value to the register "p" with =C-x r s p=, it
     will overwrite the setting above for the current emacs session.

3) [[http://orgmode.org/manual/Literal-examples.html#Literal-examples][Abbrevs]]

 - Activate the abbrev minor-mode in org-mode:

   + M-x abbrev-mode

   + /Permanently/:

       + =(add-hook 'org-mode-hook (lambda () (abbrev-mode 1)))=

 - In org-mode, type "sbp" (a sample abbreviation for a perl source
   block).

 - Immediately after "sbp" type =C-x a i l=.

 - Enter the expansion: 

   - =#+begin_src perl[C-q C-j][C-q C-j]#+end_src=

   - Note: =C-q C-j= creates a new line in the minibuffer

 - Now, whenever, you type sbp followed by =SPACE= or =RET= in an
   org-mode buffer, the src block will magically appear.

 - To review your list of abbrevs, type =M-x edit-abbrevs=.

 - If you want more complex completion (like yasnippet) you can combine
   abbrev mode with [[http://www.emacswiki.org/emacs/SkeletonMode][skeletons]].

4) [[http://code.google.com/p/yasnippet/][Yasnippet]]

 - Several org-mode users install yasnippet for convenient, complex
   expansion.

 - See Bernt Hansen's [[http://doc.norang.ca/org-mode.html#Yasnippets][org-mode setup]] for a good introduction to
   yasnippet.

* Remember
  :PROPERTIES:
  :CUSTOM_ID: Remember
  :END:
** Can I use the remember buffer to clock a customer phone call?
   :PROPERTIES:
   :CUSTOM_ID: use-remember-buffer-to-clock-phone-call
   :END:

  Yes, you can.  Take a look at the [[http://thread.gmane.org/gmane.emacs.orgmode/5482][setup described by Bernt Hansen]]
  and check out (in the same thread) what Nick Docos had to fix to
  make Bernt's set-up work for him.
** Can I automatically start the clock when opening a remember template?
   :PROPERTIES:
   :CUSTOM_ID: start-clock-when-opening-remember-template
   :END:

   Yes, this is possible.  Use the following code and make sure that
   after executing it, `my-start-clock-if-needed' is in
   `remember-mode-hook' /after/ `org-remember-apply-template'.

   : (add-hook 'remember-mode-hook 'my-start-clock-if-needed 'append)
   : (defun my-start-clock-if-needed ()
   :   (save-excursion
   :     (goto-char (point-min))
   :     (when (re-search-forward " *CLOCK-IN *" nil t)
   :       (replace-match "")
   :       (org-clock-in))))

   Then, when a template contains the key string CLOCK-IN, the clock
   will be started.  Starting with Org-mode version 5.20, the clock will
   automatically be stopped when storing the remember buffer.

* Searches
  :PROPERTIES:
  :CUSTOM_ID: Searches
  :END:
** Isearch does not find string hidden in links.  What can I do?
   :PROPERTIES:
   :CUSTOM_ID: isearch-in-links
   :END:

  M-x =visible-mode= will display the full link, making them searchable.

** How can I reduce the amount of context shown in sparse trees?
   :PROPERTIES:
   :CUSTOM_ID: context-in-sparse-trees
   :END:

   Take a look at the following variables:

   - =org-show-hierarchy-above=
   - =org-show-following-headline=
   - =org-show-siblings=
   - =org-show-entry-blow=

   which give command-dependent control over how much context is shown
   by a particular operation.

** How can I combine the results of two calls to =org-occur=?
   :PROPERTIES:
   :CUSTOM_ID: two-calls-to-org-occur
   :END:

   You can construct a regular expression that matches all targets you
   want.  Alternatively, use a =C-u= prefix with the second and any
   further calls to =org-occur= to keep the current visibility and
   highlighting in addition to the new ones.

* Agenda
  :PROPERTIES:
  :CUSTOM_ID: Agenda
  :END:
** How can I change the advanced warning time for deadlines?
##<<warning-period-for-deadlines>>

Deadline warnings appear in the daily agenda view a specified number
of days before the deadline is due. The default setting is 14 days.
You can change this with the variable =org-deadline-warning-days=.
(See [[http://orgmode.org/manual/Deadlines-and-scheduling.html#Deadlines-and-scheduling][this section]] of the manual.)

For instance,

: (setq org-deadline-warning-days 30)

would cause warnings for each deadline to appear 30 days in advance.

Naturally, you might not want warnings for all of your deadlines to
appear so far in advance. Thus, you can change the lead time for
individual items as follows:

: * TODO Get a gift for the party
:   DEADLINE: <2009-01-16 Fri -2d>

The "-2d" above changes the lead time for this deadline warning to two
days in advance. You can also use "w" for weeks and "m" for months.
** How can I postpone a task until a certain date?
   :PROPERTIES:
   :CUSTOM_ID: deferring-tasks
   :END:

The easiest way to postpone a task is to schedule it in the future.
For instance, typing =C-c C-s +2w= on a headline will push a task two
weeks into the future, so that it won't show up on the daily agenda
until two weeks from now.

If you'd like to prevent the task from showing up on your global todo
list, you have a couple of options.

1. You can set the variable =org-agenda-todo-ignore-scheduled= to =t=.
   This will exclude any scheduled items from your global list of
   active todos (=C-c a t=). (The variable
   =org-agenda-todo-ignore-with-date= will exclude both scheduled and
   deadline items from your todo list).
2. You can remove the todo keyword from the item (C-c C-t <SPC>). The
   item will still appear on your agenda two weeks from today, but it
   won't show up on your todo lists.
** Can I send myself an email containing tasks or other agenda info?
   :PROPERTIES:
   :CUSTOM_ID: email-containing-tasks-or-other-agenda-info
   :END:

   Yes.  See [[http://article.gmane.org/gmane.emacs.orgmode/6112][this thread]] on the list.

** How can I limit the agenda view to my "work" tasks?
   :PROPERTIES:
   :CUSTOM_ID: limit-agenda-with-tag-filtering
   :END:

   It is often convenient to group org files into separate categories,
   such as "home" and "work" (or "personal" and "professional"). One
   of the main reasons for such classification is to create agenda
   views that are limited by type of work or area of responsibility.
   For instance, while at work, one may want to see only professional
   tasks; while away from work, one may want to see only personal
   tasks.

   One way to categorize files and tasks is to use a "#+FILETAGS"
   declaration at the top of each file, such as:

   : #+FILETAGS: work

   As long as org-use-tag-inheritance is turned on, the filetags will
   be inherited by all tasks in the file. A file can have multiple
   filetags. And, of course, tags can be added to individual headings.

   Tasks can be quickly filtered by tag from within the agenda by
   typing "/" and the name of the tag. The full key sequence to filter
   for work items in an agenda view would be:

   : C-c a a / work [or a tag shortcut]

** How can I limit the agenda view to a particular category?
   :PROPERTIES:
   :CUSTOM_ID: limit-agenda-with-category-match
   :END:

   Another way to filter agenda views by type of work is to use a
   "#+CATEGORY" declaration at the top of each file, such as:

   : #+CATEGORY: work

   Categories can also be added to individual headings within a file:

   : * Big project
   :   :PROPERTIES:
   :   :CATEGORY: work
   :   :END:

   All todos belonging to the category "work" can be found a with a
   simple tags-todo search:

   : C-c a M

   At the prompt, type:

   : CATEGORY="work"

   The same results can be achieved with custom agenda commands, such as:

#+BEGIN_SRC emacs-lisp
(setq org-agenda-custom-commands
      '(("h" tags-todo "CATEGORY=\"home\"")
        ("w" tags-todo "CATEGORY=\"work\"")
        ;; other custom agenda commands here
        ))
#+END_SRC

** How can include all org files in a directory in my agenda?
   :PROPERTIES:
   :CUSTOM_ID: set-agenda-files-using-wildcards
   :END:

You can simply include the directory (as one of the items) in the
value of the variable org-agenda-files:

: (setq org-agenda-files '("/my/special/path/org/"))

There is another way of accomplishing the same end:

: (setq org-agenda-files (file-expand-wildcards "/my/special/path/org/*.org"))

** Why aren't items disappearing from my agenda once they are marked done?
   :PROPERTIES:
   :CUSTOM_ID: removing-done-items-from-agenda
   :END:

If items remain on your daily/weekly agenda after they are marked
done, check the configuration of the following variables:

: org-agenda-skip-scheduled-if-done
: org-agenda-skip-deadline-if-done
: org-agenda-skip-timestamp-if-done

For instance, type:

: M-x customize-variable RET org-agenda-skip-scheduled-if-done

If this variable is turned off (=nil=), then scheduled items will
remain on the agenda even after they are marked done.

If the variable is turned on (=t=), then scheduled items will
disappear from the agenda after they are marked done.

If these settings seem not to behave the way you expect, then make
sure you understand [[scheduled-vs-deadline-vs-timestamp][the
difference between SCHEDULED, DEADLINE, and timestamps]].

** What is the difference between SCHEDULED, DEADLINE, and plain timestamps?
   :PROPERTIES:
   :CUSTOM_ID: scheduled-vs-deadline-vs-timestamp
   :END:

1. SCHEDULED items (set with =C-c C-s=) will appear on your agenda on
   the day they are scheduled and on every day thereafter until they
   are done. Schedule a task if you want to be reminded to do
   something beginning on a certain day and until it is done.

: ** TODO Scheduled item
:    SCHEDULED: <2009-03-01 Sun>

2. Items with a DEADLINE timestamp (set with =C-c C-d=) appear on your
   agenda in advance of the when they are due and remain on your
   agenda until they are done. Add a DEADLINE to an item if you want
   to make sure to complete it by a certain date. (The variable
   org-deadline-warning-days determines how far in advance items with
   deadlines will show up in the agenda. See [[warning-period-for-deadlines][this FAQ]] for more
   information.)

: ** TODO Item with a deadline
:    DEADLINE: <2009-01-20 Tue>

3. An active timestamp (set with =C-c .=) will appear on your agenda
   only on the day it is scheduled. Use a timestamp for appointments
   or any reminders you want to show up only on a particular day.

: ** TODO Item with an active timestamp
: <2009-04-18 Sat>

Note: items with inactive timestamps (set with C-c ! and marked by
square brackets) will not show up in the agenda at all.

** Can I add files recursively to my list of agenda files?
   :PROPERTIES:
   :CUSTOM_ID: set-agenda-files-recursively
   :END:

Yes, you can use the library "find-lisp."

: (load-library "find-lisp")
: (setq org-agenda-files (find-lisp-find-files "~/org" "\.org$"))

This will add all files ending in =org= in the directory "~/org"
and all of its subdirectories to your list of agenda files.

See [[http://thread.gmane.org/gmane.emacs.orgmode/8992][this thread]] on the mailing list for more information.

** Why does an item appearing at the wrong time of day in my agenda?
   :PROPERTIES:
   :CUSTOM_ID: agenda-wrong-time-of-day
   :END:

When preparing the agenda view, org-mode scans each relevant headline
for a time designation. This approach is very nice for adding
free-form timestamps to an item for scheduling. Thus, either of the
following work would work to schedule an item at 10:00am:

#+begin_src org
,** 10:00am Get dried ice at the magic store
,   SCHEDULED: <2009-05-27 Wed>
#+end_src

#+begin_src org
,** Get dried ice at the magic store
,   SCHEDULED: <2009-05-27 Wed 10:00>
#+end_src

To enable this flexibility, org-mode scans the entire headline for
time of day notation. A potential problem can arise if you use
inactive timestamps in the headline to note when an item was created.
For example,

#+begin_src org
,** Get dried ice at the magic store [2009-05-26 Tue 12:58]
,   SCHEDULED: <2009-05-27 Wed>
#+end_src

Org mode would interpret the time in the inactive timestamp as a
time-of-day indicator and the entry would appear in your agenda at
12:58.

If you would like to turn off the time-of-day search, you can
configure the variable =org-agenda-search-headline-for-time= (requires
org-mode >= 6.24).

* Appointments/Diary
  :PROPERTIES:
  :CUSTOM_ID: Appointments/Diary
  :END:
** Is it possible to include entries from org-mode files into my emacs diary?
   :PROPERTIES:
   :CUSTOM_ID: include-entries-from-org-mode-files-into-emacs-diary
   :END:

   Since the org-mode agenda is much more powerful and can contain the
   diary, you should think twice before deciding to do this.  If you
   insist, however, integrating Org-mode information into the diary is
   possible.  You need to turn on /fancy diary display/ by setting in
   .emacs:

   : (add-hook 'diary-display-hook 'diary-fancy-display)

   Then include the following line into your ~/diary file, in
   order to get the entries from all files listed in the variable
   =org-agenda-files=

   : &%%(org-diary)

   You may also select specific files with

   : &%%(org-diary) ~/path/to/some/org-file.org
   : &%%(org-diary) ~/path/to/another/org-file.org

   If you now launch the calendar and press @<tt>d@</tt> to display a
   diary, the headlines of entries containing a timestamp, date range,
   schedule, or deadline referring to the selected date will be listed.
   Just like Org-mode's agenda view, the diary for /today/ contains
   additional entries for overdue deadlines and scheduled items.  See
   also the documentation of the =org-diary= function.  Under XEmacs, it
   is not possible to jump back from the diary to the org, this works
   only in the agenda buffer.
** I want to add my Org scheduled/deadlined entries in my diary!
   :PROPERTIES:
   :CUSTOM_ID: add-Org-scheduled/deadlined-entries-to-diary!
   :END:

  Put this in your ~/.diary:

  : &%%(org-diary :scheduled :timestamp :deadline)

** How can I set up automatic reminders based on Org information?
   :PROPERTIES:
   :CUSTOM_ID: automatic-reminders
   :END:

  See [[http://article.gmane.org/gmane.emacs.orgmode/5271][this post]] by N. Dokos on the list.
** How can I make =appt= notice my Org appointments?
   :PROPERTIES:
   :CUSTOM_ID: appt-notice-my-Org-appointments
   :END:

  : M-x org-agenda-to-appt RET

** How can I create more complex appointments in my org-files?
   :PROPERTIES:
   :CUSTOM_ID: diary-sexp-in-org-files
   :END:

Org-mode's active timestamps work very well for scheduling individual
or recurring appointments, such as:

#+begin_src org
  ,* 8:00am Dentist appointment <2009-01-16 Fri>
#+end_src

or
#+begin_src org
  ,* Vacation
  ,  <2009-03-20 Fri>--<2009-04-01 Wed>
#+end_src

or

#+begin_src org
  ,* Weekly meeting with boss
  ,  <2009-01-20 Tue 14:00 +1w>
#+end_src

Sometimes, however, you need to set up more complicated recurring
appointments. Org-mode has built-in support for many of
[[http://www.gnu.org/software/emacs/manual/html_node/emacs/Sexp-Diary-Entries.html][the
powerful sexp entries]] that work in [[http://www.gnu.org/software/emacs/manual/html_node/emacs/Diary.html#Diary][Emacs diary]]. Let's say, for
instance, that you teach a class that meets every Monday evening
between February 16 and April 20, 2009. The way to enter this an
org-mode file is:

#+begin_src org
  ,** Class 7:00pm-9:00pm
  ,   <%%(and (= 1 (calendar-day-of-week date)) (diary-block 2 16 2009 4 20 2009))>
#+end_src

The expression above designates all Mondays that fall between February
16 and April 20. How exactly does it work?

 - (and... :: Indicates that *both* of the conditions that follow have
          to be true.

   - (= 1 (calendar-day-of-week date)) :: Is the day of the week a
        Monday?

       - Note: the function calendar-day-of-week converts the date to the day of week
         expressed in numeric form, where 0 = Sunday, 1 = Monday, and so on.

   - (diary-block 2 16 2009 4 20 2009) :: Does the date fall between
        these two dates?

You can make a sexp as complex as you like. If you wanted to omit a
week because of holidays, for instance, you could add another
condition to the sexp:

#+begin_src org
  ,** Class 7:00pm-9:00pm
  ,   <%%(unless (diary-block 3 9 2009 3 13 2009) (and (= 1 (calendar-day-of-week date)) (diary-block 2 16 2009 4 20 2009)))>
#+end_src

The sexp above would omit Monday during the week of March 9, 2009. For
another way to accomplish the same thing, see [[org-diary-class][this FAQ]].

Another diary function commonly used for more complex scheduling is
diary-float. For instance,

#+begin_src org
  ,* Monthly meeting
  ,  <%%(diary-float t 3 3)>
#+end_src

...would appear on the third Wednesday of every month.

For more ideas on how to create diary special expressions, see [[http://www.emacswiki.org/cgi-bin/wiki/DiaryMode][this
page on the Emacs wiki]].

** How can I schedule a weekly class that lasts for a limited period of time?
   :PROPERTIES:
   :CUSTOM_ID: org-diary-class
   :END:

Org-mode offers a convenient diary sexp function for setting up a
recurring appointment that lasts for a certain period of time, such as
a class. It is called org-diary-class and it can be entered as
follows:

#+begin_src org
  ,** Class 7:00pm-9:00pm
  ,   <%%(org-diary-class 2 16 2009 4 20 2009 1 10)>
#+end_src

The function above schedules an appointment for every Monday (1)
between February 16 and April 20, 2009, except for ISO week 10 (March
1 to March 7).

The function org-diary-class has the following format:

: (org-diary-class M1 D1 Y1 M2 D2 Y2 DAYNAME &rest SKIP-WEEKS)

M1/2, D1/2, and Y1/2 indicate the beginning and ending dates. Dayname
takes the form of a number indicating the day of the week (0 = Sunday,
1 = Monday, and so on...). In addition, one can add an optional
argument SKIP-WEEKS to indicate weeks on the calendar that should be
skipped. This argument should be expressed as an ISO week number. You
can find the number by invoking emacs' built-in calendar (=M-x
calendar=), navigating to the appropriate week, and typing =p c=
(calendar-iso-print-date).

** How can I set an event to occur every day except Saturday and Sunday?

   #+begin_example
   ** Daily meeting
      <%%(memq (calendar-day-of-week date) '(1 2 3 4 5))>
   #+end_example

* Export
  :PROPERTIES:
  :CUSTOM_ID: Export
  :END:
** Can I get TODO items exported to HTML as lists, rather than as headlines?
   :PROPERTIES:
   :CUSTOM_ID: export-TODO-items-as-lists
   :END:

   If you plan to use ASCII or HTML export, make sure things you want to
   be exported as item lists are level 4 at least, even if that does
   mean there is a level jump.  For example:

   : * Todays top priorities
   : **** TODO write a letter to xyz
   : **** TODO Finish the paper
   : **** Pick up kids at the school

   Alternatively, if you need a specific value for the heading/item
   transition in a particular file, use the =#+OPTIONS= line to
   configure the H switch.

   : #+OPTIONS:   H:2; ...

** Can I export only a single subtree?
   :PROPERTIES:
   :CUSTOM_ID: export-single-subtree
   :END:

   If you want to export a subtree, mark the subtree as region and then
   export.  Marking can be done with =C-c @ C-x C-x=, for example.

** How can I tell my calendar web application about appointments in my agenda files?

Here is what you need to do:

1. a script that calls Emacs in batch mode and produce a .ics file
2. a script that uploads this .ics file somewhere on the web
3. tell your webapp to fetch this .ics file on the web

Here is the script I use for the first step:

#+begin_src shell-script-mode
#!/bin/bash

/usr/local/bin/emacs --batch --eval \
"(progn (load-file \"~/install/git/org-mode/org.el\") \
        (load-file \"~/elisp/config/org-batch-config.el\") \
        (setq org-combined-agenda-icalendar-file \"~/org/cal/org.ics\")
        (setq org-agenda-files (quote (\"~/org/bzg.org\"))))" \
    -f org-export-icalendar-combine-agenda-files
#+end_src

Depending on your configuration, you might change the load sequence.

Here is the script I use for the second step:

#+begin_src shell-script-mode
#!/bin/bash
/usr/bin/rsync -rtv ~/org/org.ics -e ssh me@my_server:/home/me/public_html/
#+end_src

Note: if you want to cron this rsync script, you will need to let
=my_server= to know about your SSH public key.  Check [[http://troy.jdmz.net/rsync/index.html][this page]] as a
starter.

Now you can cron the two scripts above and your webapp will always be
up to date with your Org agendas.

Also see [[http://orgmode.org/org.html#Exporting-Agenda-Views][Exporting agenda views]] from Org manual.

** How can I get Mac OSX 10.3 iCal to import my Org-exported .ics files?
   :PROPERTIES:
   :CUSTOM_ID: iCal-import-ics-files-old
   :END:

   When using iCal under Apple MacOS X Tiger, you can create a new
   calendar /OrgMode/ (the default name for the calendar created by =C-c
   C-e c=, see the variables =org-icalendar-combined-name= and
   =org-combined-agenda-icalendar-file=).  Then set Org-mode to
   overwrite the corresponding file /~/Library/Calendars/OrgMode.ics/.
   You may even use AppleScript to make iCal re-read the calendar files
   each time a new version of /OrgMode.ics/ is produced.  Here is the
   setup needed for this:

   : (setq org-combined-agenda-icalendar-file
   :     "~/Library/Calendars/OrgMode.ics")
   : (add-hook 'org-after-save-iCalendar-file-hook
   :  (lambda ()
   :   (shell-command
   :    "osascript -e 'tell application \"iCal\" to reload calendars'")))

** How can I get Mac OSX 10.4 or later iCal to import my Org-exported .ics files?
   :PROPERTIES:
   :CUSTOM_ID: iCal-import-ics-files-new
   :END:

   For Mac OS X 10.4, you need to write the ics file to
   =/Library/WebServer/Documents/= and then subscribe iCalendar to
   =http: //localhost/orgmode.ics=

** How can I remove timestamps and todo keywords from my exported file?
   :PROPERTIES:
   :CUSTOM_ID: export-options-remove-timestamps
   :END:

You can place an options line at the top of your org file:

: #+OPTIONS: <:nil todo:nil

There is a whole host of export options you can set with an in-buffer
options or via global variables. See [[http://orgmode.org/manual/Export-options.html#Export-options][this section]] of the manual for a
full list.

** How can I preserve faces when I export an agenda from the command line?
   :PROPERTIES:
   :CUSTOM_ID: preserving-faces-during-batch-export
   :END:

Normally, when you export an org file or an agenda view from within
emacs, htmlize will convert your face definitions to direct color css
styles inlined into each =<span>= object, resulting in an HTML output
that preserves the general look of your Org buffers and agenda views.

Let's say you generate an export from the command line, such as the
following:

: emacs -batch -l ~/.emacs -eval '(org-batch-agenda "e")'

or

: emacs -batch -l ~/.emacs -eval '(org-publish-all)'

In such an instance, the exported HTML will contain only very basic
color styles. The reason is that when Emacs is run in batch mode, it
does not have a display and therefore only rudimentary face
definitions.  If you'd like to use more complex styles, you'll have to
make sure that the export process only assigns classes instead of
direct color values.  This can be done by binding the variable
=org-export-htmlize-output-style= to =css= for the duration of the
export, for example with

: emacs -batch -l ~/.emacs
:   -eval '(let ((org-export-htmlize-generate-css (quote css)))
:            (org-batch-agenda "e"))'

Then you can use a style file to make these classes look any way you
like.  To generate face definitions for a CSS file based on any faces
you are currently using in Emacs, you can use the following command:

: M-x org-export-htmlize-generate-css RET

This will generate a =<style>...</style>= section, the content of
which you can add to your style file.

** How can I avoid dark color background when exporting agenda to ps format?
   :PROPERTIES:
   :CUSTOM_ID: avoiding-dark-background-when-exporting-agenda
   :END:

Add this to your .emacs and evaluate it.

#+BEGIN_SRC emacs-lisp
  (setq org-agenda-exporter-settings
        '((ps-print-color-p 'black-white)))
#+END_SRC

** How can I get colored source code when exporting to LaTeX?
   :PROPERTIES:
   :CUSTOM_ID: fontified_source_code_w_latex
   :END:

As of Sun Aug 9 2009 the "current" version of Org-mode (see
[[keeping-current-with-Org-mode-development]]) supports exporting source
code to LaTeX using the listings package.

To turn on listing export add the following to your Org-mode
customization.
#+begin_src emacs-lisp
  ;; requite org-latex so that the following variables are defined
  (require 'org-latex)
  
  ;; tell org to use listings
  (setq org-export-latex-listings t)
  
  ;; you must include the listings package
  (add-to-list 'org-export-latex-packages-alist '("" "listings"))
  
  ;; if you want colored source code then you need to include the color package
  (add-to-list 'org-export-latex-packages-alist '("" "color"))
#+end_src

The listings package will now be used to fontify source code in your
LaTeX documents.  By default listings will not color any of your
source code.  If you would like to set colors for keywords and
comments in your latex documents you can do so using LaTeX directives
like the following.
#+begin_src latex
  \lstset{keywordstyle=\color{blue},
    commentstyle=\color{red},
    stringstyle=\color{green}
  }
#+end_src

of if you want to get even fancier with your colors you can try
something like the following
#+begin_src latex
\definecolor{keywords}{RGB}{255,0,90}
\definecolor{comments}{RGB}{60,179,113}
\definecolor{fore}{RGB}{249,242,215}
\definecolor{back}{RGB}{51,51,51}
\lstset{
  basicstyle=\color{fore},
  keywordstyle=\color{keywords},  
  commentstyle=\color{comments},
  backgroundcolor=\color{back}
}
#+end_src

For more complex listings use cases consult the [[ftp://ftp.tex.ac.uk/tex-archive/macros/latex/contrib/listings/listings.pdf][listings manual]].

** How can I export to Latex Beamer
   :PROPERTIES:
   :CUSTOM_ID: beamer
   :END:
The latex [[http://latex-beamer.sourceforge.net/][Beamer Class]] is a useful class for generating slide shows.
The following can be used to export Org-mode documents to LaTeX
beamer.

Add the following to your Emacs initialization file.
#+begin_src emacs-lisp
  (unless (boundp 'org-export-latex-classes)
    (setq org-export-latex-classes nil))
  (add-to-list 'org-export-latex-classes
               '("beamer"
                 "\\documentclass[11pt]{beamer}\n\\usepackage[utf8]{inputenc}\n\\usepackage[T1]{fontenc}\n\\usepackage{hyperref}\n\\usepackage{verbatim}\n"
                 ("\\section{%s}" . "\\section*{%s}")
                 ("\\begin{frame}\\frametitle{%s}" "\\end{frame}"
                  "\\begin{frame}\\frametitle{%s}" "\\end{frame}")))
#+end_src

Then by placing
: #+LaTeX_CLASS: beamer
in the header of your Org-mode document it will automatically export
to the Beamer document class on LaTeX export.  With the above
configuration top-level headers will be mapped to sections in the
Beamer document, second-level headers will be mapped to frames, and
lower level headlines will be mapped to itemize objects.

This above is adapted from an [[http://article.gmane.org/gmane.emacs.orgmode/15077/match=beamer+dokos][email by Nick Dokos]], and an [[http://article.gmane.org/gmane.emacs.orgmode/17767/match=beamer+dokos][email by
Thomas Dye]].  For a much more complex Beamer setup see the [[http://article.gmane.org/gmane.emacs.orgmode/17767/match=beamer+dokos][email by
Thomas Dye]].

** How can I use RefTeX in Org-mode files for LaTeX export and in Org-babel LaTeX code blocks?

[[http://www.gnu.org/software/auctex/reftex.html][RefTeX]] is an indispensable tool for the author of LaTeX documents.  It
aids in creation of bibliographies, cross-references, indexes, and
glossaries.  RefTeX understands the structure of multi-file LaTeX
documents and is able to collect from them information about the
location(s) of external data stores used in creation of the final
document.  RefTeX was written by Carsten Dominik and is currently
being maintained by the [[http://www.gnu.org/software/auctex/index.html][AucTeX]] project.

*** Using RefTeX In Org-mode Files for LaTeX Export
In Org-mode files for LaTeX export, the trick is to find a way to tell
RefTeX the locations of external data stores.  One way is to set the
variable, =reftex-default-bibliography=.  Add lines like these to
.emacs:

#+begin_src emacs-lisp 
  (setq reftex-default-bibliography
        (quote
         ("default.bib" "other-default.bib")))       
#+end_src

In practice, this is a limited solution and the
typical user will want to pass this information on a per-file basis.
Two solutions to this problem were posted on a blog, [[http://www.mfasold.net/blog/2009/02/using-emacs-org-mode-to-draft-papers/][Mario's
Braindump]].  

The first solution, proposed by Mario, enables the RefTeX citation
function in Org-mode.  Add these lines to .emacs:

#+begin_src emacs-lisp
  (defun org-mode-reftex-setup ()
    (load-library "reftex")
    (and (buffer-file-name)
         (file-exists-p (buffer-file-name))
         (reftex-parse-all))
    (define-key org-mode-map (kbd "C-c )") 'reftex-citation))
  (add-hook 'org-mode-hook 'org-mode-reftex-setup)
#+end_src

Then add the following lines anywhere in the Org-mode file (Org-mode
will recognize them as LaTeX commands):

#+begin_src org
\bibliographystyle{plain}
\bibliography{BIB-NAME}
#+end_src

With this setup, =C-c )= will invoke =reftex-citation= which will
insert a reference in the usual way:

#+begin_src org
  ,* test reftex
  
  ,This is a citation \cite{tierney90}.
  
  ,\bibliographystyle{plain}
  ,\bibliography{tsd}
#+end_src

This Org-mode file will export the following LaTeX output:

#+begin_src latex :exports code
  % Created 2010-03-22 Mon 14:34
  \documentclass[11pt,letter]{article}
  \usepackage[utf8]{inputenc}
  \usepackage[T1]{fontenc}
  \usepackage{hyperref}
  
  \title{test.org}
  \author{Tom Dye}
  \date{2010-03-22 Mon}
  
  \begin{document}
  
  \maketitle
  
  \setcounter{tocdepth}{3}
  \tableofcontents
  \vspace*{1cm}
  
  \section{test reftex}
  \label{sec-1}
  
  
  This is a citation \cite{tierney90}.
  
  \bibliographystyle{plain}
  \bibliography{tsd}
  
  \end{document}
#+end_src


A second solution, to activate the RefTeX minor mode on a per-file
basis, was posted by Kevin Brubeck Unhammer in response to this idea.
Add the following lines to .emacs:

#+begin_src emacs-lisp
  (add-hook ‘org-mode-hook
             (lambda ()
               (if (member “WRITE” org-todo-keywords-1)
                   (org-mode-article-modes))))
#+end_src

where =org-mode-article-modes= is defined as follows:

#+begin_src emacs-lisp
  (defun org-mode-article-modes ()
    (reftex-mode t)
    (bib-cite-minor-mode t)
    (and (buffer-file-name)
         (file-exists-p (buffer-file-name))
         (reftex-parse-all)))
#+end_src

Add the =\bibliographystyle{}= and =\bibliography{}= lines to the
Org-mode file as before and define a TODO keyword, =WRITE=, perhaps
like this:

#+begin_src org
  ,#+TODO: TODO(t) STARTED(s) WRITE | DONE(d) DEFERRED(f)
#+end_src

With this setup, you insert a citation with =M-x reftex-citation RET=.

*** Using RefTeX in Org-babel LaTeX Code Blocks

In Org-babel LaTeX code blocks, the trick is to give RefTeX access to
information in other Org-babel LaTeX code blocks.  If you use an Emacs
starter kit where configuration information is held in Org-mode files,
then the second solution is preferable because you won't be asked for
a master file when Emacs is started.  For this reason, the second
solution is modified for use with Org-babel latex code blocks.  No
key-binding is needed here because Org-babel code blocks are edited
within the usual AucTeX environment.

Add the following lines to .emacs (adapted from  Kevin Brubeck Unhammer's [[http://www.mfasold.net/blog/2009/02/using-emacs-org-mode-to-draft-papers/][Reftex Setup]])
#+begin_src emacs-lisp
  (defun org-mode-article-modes ()
    (reftex-mode t)
    (and (buffer-file-name)
         (file-exists-p (buffer-file-name))
         (reftex-parse-all)))
  
  (add-hook 'org-mode-hook
            (lambda ()
              (if (member "REFTEX" org-todo-keywords-1)
                  (org-mode-article-modes))))
#+end_src

Then add a line like the following line to the top of your org-mode file:

#+begin_src org
  ,#+TODO: TODO(t) STARTED(s) | DONE(d) DEFERRED(f) REFTEX
#+end_src

When you open an org-mode file with a line like this, RefTeX will
prompt for the master .tex file, which will be parsed in the usual
way.  This means that the .tex file should already exist, perhaps by
tangling the LaTeX preamble and postamble, before
=org-mode-article-modes= is activated for the Org-mode file.

* MobileOrg

** Which versions of MobileOrg do exist
   :PROPERTIES:
   :CUSTOM_ID: mobileorg_versions
   :END:

- MobileOrg for the iPhone/iPod Touch/iPad series of devices, by
  Richard Moreland.  Check out
  [[http://mobileorg.ncogni.to/][Richard's page]]
- Matt Jones is developing a feature-equivalent application for
  Android, see
  [[http://wiki.github.com/matburt/mobileorg-android/][his project page]].

** What can I do if I don't want to use Dropbox.com
   :PROPERTIES:
   :CUSTOM_ID: mobileorg_webdav
   :END:

Dropbox.com is the easiest way to connect between Emacs and MobileOrg,
you can get a free account there.  If for some reason you cannot or do
not want to use this path, you can use any webdav server.  On this
webdav server you need to create a dedicated directory for the
communication between Emacs and MobileOrg.  If you can mount that
directory locally so that Emacs can directly write to it, just point
to that directory using the variable =org-mobile-directory=.  Using
the /tramp/ method, =org-mobile-directory= may point to a remote
directory accessible through, for example, /ssh/ and /scp/:

#+begin_src emacs-lisp
(setq org-mobile-directory "/scpc:user@@remote.host:org/webdav/")
#+end_src

If Emacs cannot access the WebDAV directory directly using a /tramp/
method, you can use a local directory for staging.  Other means must
then be used to keep this directory in sync with the WebDAV directory.
In the following example, files are staged in =~/stage/=, and Org-mode
hooks take care of moving files to and from the WebDAV directory using
/scp/.

#+begin_src emacs-lisp
(setq org-mobile-directory "~/stage/")
(add-hook 'org-mobile-post-push-hook
  (lambda () (shell-command "scp -r ~/stage/* user@@wdhost:mobile/")))
(add-hook 'org-mobile-pre-pull-hook
  (lambda () (shell-command "scp user@@wdhost:mobile/mobileorg.org ~/stage/ ")))
(add-hook 'org-mobile-post-pull-hook
  (lambda () (shell-command "scp ~/stage/mobileorg.org user@@wdhost:mobile/")))
#+end_src

* COMMENT HTML style specifications

#+begin_src emacs-lisp
  (defun org-faq-make-target ()
    "Make hard target for current headline."
    (interactive)
    (if (not (org-on-heading-p))
        (error "Not on a headline"))
    (let ((h (org-trim (org-get-heading 'no-tags))))
      (if (string-match "[ \t]*\\?\\'" h)
          (setq h (replace-match "" t t h)))
      (while (string-match "[ \t]+" h)
        (setq h (replace-match "-" t t h)))
      (org-entry-put nil "CUSTOM_ID" h)))
#+end_src