Unicode-Characters for TODO-States in Emacs Orgmode

By default Emacs Orgmode uses uppercase words for todo keywords. But having tens of entries marked with TODO and DONE in my file looked horribly cluttered to me. So I searched for alternatives. After a few months of experimentation, I decided on the following scheme.

keep auto-complete from competing with org-mode structure-templates

For a long time it bothered me that auto-complete made it necessary for me to abort completion before being able to use org-mode templates.

I typed <s and auto-complete showed stuff like <string, forcing me to hit C-g before I could use TAB to complete the template with org-mode.

I fixed this for me by adding all the org-mode structure templates as stop-words:

;; avoid competing with org-mode templates.
(add-hook 'org-mode-hook
          (lambda ()
            (make-local-variable 'ac-stop-words)
            (loop for template in org-structure-template-alist do
                  (add-to-list 'ac-stop-words 
                               (concat "<" (car template))))))

Org-mode with Parallel Babel

Update 2017: a block with sem -j ... seems to block in recent versions of Emacs until all subtasks are done. It would be great if someone could figure out why (though it likely is the right thing to do). To circumvent that, you can daemonize the job in sem, but that might have unwanted side-effects: sem "[job] &"

Babel in Org

Emacs Org-mode provides the wonderful babel-capability: Including code-blocks in any language directly in org-mode documents in plain text.

In default usage, running such code freezes my emacs until the code is finished, though.

Up to a few weeks ago, I solved this with a custom function, which spawns a new emacs as script runner for the specific code:

; Execute babel source blocks asynchronously by just opening a new emacs.
(defun bab/org-babel-execute-src-block-new-emacs ()
  "Execute the current source block in a separate emacs,
so we do not block the current emacs."
  (let ((line (line-number-at-pos))
        (file (buffer-file-name)))
    (async-shell-command (concat 
                          "TERM=vt200 emacs -nw --find-file " 
                          " --eval '(goto-line "
                          (number-to-string line) 
                          ")' --eval "
     "'(let ((org-confirm-babel-evaluate nil))(org-babel-execute-src-block t))' "
                          "--eval '(kill-emacs 0)'"))))

and its companion for exporting to beamer-latex presentation pdf:

; Export as pdf asynchronously by just opening a new emacs.
(defun bab/org-beamer-export-new-emacs ()
  "Export the current file in a separate emacs,
so we do not block the current emacs."
  (let ((line (line-number-at-pos))
        (file (buffer-file-name)))
    (async-shell-command (concat 
                          "TERM=vt200 emacs -nw --find-file " 
                          " --eval '(goto-line " 
                          (number-to-string line) 
                          ")' --eval "
     "'(let ((org-confirm-babel-evaluate nil))(org-beamer-export-to-pdf))' "
                          "--eval '(kill-emacs 0)'"))))

But for shell-scripts there’s a much simpler alternative:

Tutorial: Writing scientific papers for ACPD using emacs org-mode

PDF-version (for printing)

orgmode-version (for editing)

Emacs Org mode is an excellent tool for reproducible research,1 but research is only relevant if people learn about it.2 To reach people with scientific work, you need to publish your results in a Journal, so I show here how to publish in ACPD with Emacs Org mode.3

Unicode char \u8:χ not set up for use with LaTeX: Solution (made easy with Emacs)

For years I regularly stumbled over LaTeX-Errors in the form of Unicode char \u8:χ not set up for use with LaTeX. I always took the chickens path and replaced the unicode characters with the tex-escapes in the file. That was easy, but it made my files needlessly unreadable. Today I decided to FIX the problem once and for all. And it worked. Easily.

Firstoff: The problem I’m facing is that my keyboard layout makes it effortless for me to input characters like ℂ Σ and χ. But LaTeX cannot cope with them out-of-the-box.

Reproduzierbare Veröffentlichungen

Für verlässliche Wissenschaft sind reproduzierbare Veröffentlichungen essenziell - aber oft sind sie nicht gegeben12. Dieser 5-Minuten-Vortrag motiviert, wieso Reproduzierbarkeit so wichtig ist, und zeigt eine Lösung zum wirklich reproduzierbaren Veröffentlichen - die er auch selbst nutzt. Ich habe ihn in einem Seminar zum wissenschaftlichen Präsentieren gehalten.

Reproduzierbare Veröffentlichungen

PDF-version (for printing)

Release (to download)

orgmode-version (for editing)

repository (for forking)

Falscher Anreiz

  • Die Versuchung
    • „Haben Sie einmal ein Paper mit per Skript erstellten Grafiken veröffentlicht?“
    • „Haben Sie Skripte und Daten veröffentlicht?“
    • „Warum erfinden Sie die Daten nicht? Das wäre weniger Arbeit…“

    „Niemals! Das verbietet die wissenschaftliche Integrität!“

  • Doch es passiert - leider
    • Einstieg: „passte ich den Untersuchungsentwurf an“.
    • Dietrich Stapel: „Es war grau und es war üblich“.
    • Sturz: „erfindet die Daten“.
    • „Forscher gratulieren“.
    • „Drei [seiner] Doktoranden sind Ungereimtheiten […] aufgefallen“.

    [Quarks & Co., 2013-06-04]

  1. Gerade haben Biologen gezeigt3, dass die Verfügbarkeit der Rohdaten von alten Veröffentlichungen jedes Jahr um 17% fällt. Das heißt, schon nach 4 Jahren gibt es für die Hälfte der Veröffentlichungen keine Daten mehr. Die hier gezeigte Methode macht es sehr einfach sicherzustellen, dass alle für die Veröffentlichung notwendigen Daten mitveröffentlicht werden - und erzeugt automatisch eine Archivdatei dafür. 

  2. Leider ist die durch die politisch gesetzten Rahmenbedingungen erzwungene Konkurrenzsituation für reproduzierbare Veröffentlichungen hinderlich, denn wer seine Daten und Skripte veröffentlicht - eigentlich alle Programme, die er oder sie nutzte - verspielt die Möglichkeit, sich ein Monopol auf die Daten aufzubauen, das die nächsten Veröffentlichungen sichern könnte. Sobald die Daten draußen sind, können andere damit arbeiten - und nur die schnellsten können veröffentlichen (ja, das System ist dumm…). Zusätzlich stehen sauberer Veröffentlichung oft „IP“-Regeln entgegen - also der Wunsch der Uni, ihre Ergebnisse zu monopolisieren. Zum Glück gibt es mit Open Access inzwischen eine Bewegung gegen solche schädlichen Regelungen - aber der Kampf wird wohl noch lange andauern. Immerhin stehen hier Misstrauen, Gier und leider berechtigte Sorgen um die eigene Zukunft gegen wissenschaftliche Integrität. 

  3. The Availability of Research Data Declines Rapidly with Article Age - Zeitungsartikel dazu: The Vast Majority of Raw Data From Old Scientific Studies May Now Be Missing

Publish a single file with emacs org-mode

I often write small articles on some experience I make, and since I want to move towards using static pages more often, I tried using emacs org-mode publishing for that. Strangely the simple usecase of publishing a single file seems quite a bit more complex than needed, so I document the steps here.

This is my first use of org-publish, so I likely do not use it perfectly. But as it stands, it works. You can find the org-publish version of this article at

How to show the abstract before the table of contents in org-mode

I use Emacs Org-Mode for writing all kinds of articles. The standard format for org-mode is to show the table of contents before all other content, but that requires people to scroll down to see whether the article is interesting for them. Therefore I want the abstract to be shown before the table of contents.

Babcore: Emacs Customizations everyone should have

Update (2017-05): babcore is at 0.2, but I cannot currently update the marmalade package. See lisplets/babcore.el

1 Intro

PDF-version (for printing)

Package (to install)

orgmode-version (for editing)

repository (for forking)

project page (for fun ☺)

Emacs Lisp (to use)

I have been tweaking my emacs configuration for years, now, and I added quite some cruft. But while searching for the right way to work, I also found some gems which I direly miss in pristine emacs.

This file is about those gems.

Babcore is strongly related to Prelude. Actually it is just like prelude, but with the stuff I consider essential. And staying close to pristine Emacs, so you can still work at a coworkers desk.

But before we start, there is one crucial piece of advice which everyone who uses Emacs should know:

C-g: abort

Hold control and hit g.

That gets you out of almost any situation. If anything goes wrong, just hit C-g repeatedly till the problem is gone - or you cooled off far enough to realize that a no-op is the best way to react.

To repeat: If anything goes wrong, just hit C-g.

Going from a simple Makefile to Autotools

Table of Contents



I recently started looking into Autotools, to make it easier to run my code on multiple platforms.

Naturally you can use cmake or scons or waf or ninja or tup, all of which are interesting in there own respect. But none of them has seen the amount of testing which went into autotools, and none of them have the amount of tweaks needed to support about every system under the sun. And I recently found pyconfigure which allows using autotools with python and offers detection of library features.

Warning 2016: Contains some cargo-cult-programming — my current setup is cleaner thanks to using AC_CONFIG_LINKS in

Insert a scaled screenshot in emacs org-mode

@marjoleink asked on identi.ca1, if it is possible to use emacs org-mode for showing scaled screenshots inline while writing. Since I thought I’d enjoy some hacking, I decided to take the challenge.

It does not do auto-scaling of embedded images, as far as I know, but the use case of screenshots can be done with a simple function (add this to your ~/.emacs or ~/.emacs.d/init.el):

  1. Matthew Gregg: @marjoleink "way of life" thing again, but if you can invest some time, org-mode is a really powerful note keeping environment. → Marjolein Katsma: @mcg I'm sure it is - but seriously: can you embed a diagram2 or screenshot, scale it, and link it to itself? 

  2. For diagrams, you can just insert a link to the image file without description, then org-mode can show it inline. To get an even nicer user-experience (plain text diagrams or ascii-art), you can use inline code via org-babel using graphviz (dot) or ditaa - the latter is used for the diagrams in my complete Mercurial branching strategy

Recipes for presentations with beamer latex using emacs org-mode

I wrote some recipes for creating the kinds of slides I need with emacs org-mode export to beamer latex.

Update: Read ox-beamer to see how to adapt this to work with the new export engine in org-mode 0.8.

PDF recipes The recipes as PDF (21 slides, 247 KiB)

org-mode file The org-mode sources (12.2 KiB)

Below is an html export of the org-mode file. Naturally it does not look as impressive as the real slides, but it captures all the sources, so I think it has some value.

Note: To be able to use the simple block-creation commands, you need to add #+startup: beamer to the header of your file or explicitely activate org-beamer with M-x org-beamer-mode.

«I love your presentation»:

PS: I hereby allow use of these slides under any of the licenses used by worg and/or the emacs wiki.

Minimal example for literate programming with noweb in emacs org-mode

If you want to use the literate programming features in emacs org-mode, you can try this minimal example to get started: Activate org-babel-tangle, then put this into the file

Minimal example for noweb in org-mode

* Assign 

First we assign abc:

#+begin_src python :noweb-ref assign_abc
abc = "abc"

* Use

Then we use it in a function:

#+begin_src python :noweb tangle :tangle
def x():
  return abc


Custom link completion for org-mode in 25 lines (emacs)

Update (2013-01-23): The new org-mode removed (org-make-link), so I replaced it with (concat) and uploaded a new example-file: org-custom-link-completion.el.
Happy Hacking!

1 Intro

I recently set up custom completion for two of my custom link types in Emacs org-mode. When I wrote on about that, Greg Tucker-Kellog said that he’d like to see that. So I decided, I’d publish my code.

El Kanban Org: parse org-mode todo-states to use org-tables as Kanban tables

Kanban for emacs org-mode.

Update (2013-04-13): Kanban.el now lives in its own repository: on bitbucket and on a statically served http-repo (to be independent from unfree software).

Update (2013-04-10): Thanks to Han Duply, kanban links now work for entries from other files. And I uploaded kanban.el on marmalade.

Some time ago I learned about kanban, and the obvious next step was: “I want to have a kanban board from org-mode”. I searched for it, but did not find any. Not wanting to give up on the idea, I implemented my own :)

The result are two functions: kanban-todo and kanban-zero.

“Screenshot” :)

Refactor in such a way that the
let Presentation manage dumb sprites
return all actions on every command:
Make the UiState adhere the list of
Turn the model into a pure state

Paper zu Org-Mode für „reproducible research“

Ich bin gerade auf das Paper hier gestoßen:

A Multi-Language Computing Environment for Literate Programming and Reproducible Research” (PDF)

Es beschreibt schön, was mit emacs org-mode möglich ist. Dazu gehören so spannende Punkte wie im Dokument mitgelieferter Quellcode, dessen Ergebnisse automatisch eingebunden werden, so dass die Dokumente aktuell bleiben können.

Inhalt abgleichen
Willkommen im Weltenwald!

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