[Orgmode] Re: [ANN] Org-babel integrated into Org-mode

[Štěpán Němec]

"Eric Schulte" <address@hidden> writes:

> Hi Rainer,
>
> First I'll give some expanded instructions in the hopes of helping out
> anyone else affected by my lack of good instructions in the announcement
> email.  Then I'll provide a re-write of your config below as an example.
>
> Babel took the integration into Org-mode as an opportunity to do some
> much needed house cleaning.  Most importantly we have cleared out
> unnecessary configuration variables -- which is great unless you already
> have these variables set.
>
> We have eliminated the two main internal lists of languages, namely
> - org-babel-interpreters and
> - org-babel-tangle-langs
> so any config lines which mention those variables, can/should be
> stripped out in their entirety.  This includes any calls to the
> `org-babl-add-interpreter' function, whose sole purpose was to add
> languages to the org-babel-interpreters variable.
>
> alright, so with those calls stripped out, we may still in some cases
> want to associate a file name extension with certain languages, for
> example we want all of our emacs-lisp files to end in a ".el", we can do
> this will the `org-babel-tangle-lang-exts' variable.  In general you
> shouldn't need to touch this as it already has defaults for most common
> languages, and if a language is not present in org-babel-tangle-langs,
> then babel will just use the language name, so for example a file of c
> code will have a ".c" extension by default, sh code will have a ".sh"
> extension ect...
>
> You also mentioned shebang lines.  This configuration now lives in
> header arguments.  So the shebang for a single file can be set at the
> code block level, e.g.
>
> #+begin_src clojure :shebang #!/usr/bin/env clj
>   (println "with a shebang line, I can be run as a script!")
> #+end_src
>
> note that whenever a file is tangled which includes a shebang line,
> org-babel will make the file executable, so there is good reason to only
> add shebangs at the source-code level.  However if you're sure that you
> want all of your code in some language (say shell scripts) to tangle out
> with shebang lines, then you can customize the default header arguments
> for that language, e.g.
>
> ;; ensure this variable is defined defined
> (unless (boundp 'org-babel-default-header-args:sh)
>   (setq org-babel-default-header-args:sh '()))
>
> ;; add a default shebang header argument
> (add-to-list 'org-babel-default-header-args:sh
>              '(:shebang . "#!/bin/bash"))
>
> The final change, is that to conform to Emacs guidelines, the prefix
> org-babel-* in all require lines, has been changed to ob-*, also, since
> Babel now loads by default with Org-mode you can remove any
>   (require 'org-babel)
> or 
>   (require 'org-babel-init)
> that may by lying around your configuration.
>
> Whew! that was alot of writing for a /simplification/ of configuration.
> Hopefully the example of your configuration below will be a more
> succinct demonstration of the needed transformations.
>
> Rainer M Krug <address@hidden> writes:
>
>> Hi
>>
>> First of all thanks for integrating Org-babel into Org-mode.
>>
>> But for the less fluent elisp and org-mode users, I am slightly confused in
>> the changes necessary on my side.
>>
>> I have the following in my emacs.org file:
>>
>>
>> #+begin_src emacs-lisp
>>   (require 'org-babel-R)         ;; requires R and ess-mode
>>   ;; (require 'org-babel-ruby)      ;; requires ruby, irb, ruby-mode, and
>> inf-ruby
>>   (require 'org-babel-python)    ;; requires python, and python-mode
>>   ;; (require 'org-babel-clojure)   ;; requires clojure, clojure-mode,
>> swank-clojure and slime
>> #+end_src
>
> the above becomes
>
> #+begin_src emacs-lisp
>   (require 'ob-R)
>   ;; (require 'ob-ruby)
>   (require 'ob-python)
>   ;; (require 'ob-clojure)
> #+end_src
>
>> 
>> *** Start babel
>> #+begin_src emacs-lisp
>>   (org-babel-load-library-of-babel)
>> #+end_src
>
> the above becomes
>
> #+begin_src emacs-lisp
>   (org-babel-lob-ingest "~/path/to/org/contrib/babel/library-of-babel.org")
> #+end_src
>
>> 
>> *** Customization of sh
>> set shebang for sh script to "#!/bin/bash" and exclude additional comments
>> (t)
>> #+begin_src emacs-lisp
>>   (setq org-babel-tangle-langs
>>   (cons
>>   '("sh" "sh" "#!/bin/bash" t)
>> (remove-if (lambda (el) (string= (car el) "sh")) org-babel-tangle-langs)))
>> #+end_src
>
> #+begin_src emacs-lisp
>   ;; ensure this variable is defined defined
>   (unless (boundp 'org-babel-default-header-args:sh)
>     (setq org-babel-default-header-args:sh '()))
>
>   ;; add a default shebang header argument
>   (add-to-list 'org-babel-default-header-args:sh
>                '(:shebang . "#!/bin/bash"))
> #+end_src
>
>> 
>> *** Customization of R
>>   set shebang for R script to "" and exclude additional comments (t)
>> #+begin_src emacs-lisp
>>   (setq org-babel-tangle-langs
>>   (cons
>>   '("R" "R")
>>   (remove-if (lambda (el) (string= (car el) "R")) org-babel-tangle-langs)))
>> #+end_src
>>
>
> the above can be omitted entirely
>
> If you've made it this far, then thanks for your patience, and please
> let me know if you run into any problems with the above.
>
> Best -- Eric

How come some of your rewrites above still use the `org-babel-' prefix?
(As a side note, I don't see what Emacs guidelines suggest `ob-' is more
appropriate than `org-babel-', and I would personally prefer to retain
the latter -- it's much more descriptive.)

    Štěpán

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