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https://github.com/sagemath/ob-sagemath

org-babel integration with SageMath
https://github.com/sagemath/ob-sagemath

emacs sagemath

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org-babel integration with SageMath

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* ob-sagemath

  [[http://melpa.org/#/ob-sagemath][file:http://melpa.org/packages/ob-sagemath-badge.svg]]

  [[http://stable.melpa.org/#/ob-sagemath][file:http://stable.melpa.org/packages/ob-sagemath-badge.svg]]

  [[https://travis-ci.org/stakemori/ob-sagemath][https://travis-ci.org/stakemori/ob-sagemath.svg]]



  ob-sagemath provides an [[http://orgmode.org/worg/org-contrib/babel/][org-babel]] integration with [[http://www.sagemath.org/][SageMath]] by [[https://github.com/stakemori/sage-shell-mode][sage-shell-mode]].

  This package is inspired by [[https://github.com/gregsexton/ob-ipython][ob-ipython]],

  though the implementation is completely different.



** Requirements

   1. SageMath 6.6 or newer.

   1. GNU Emacs 24.3 or newer.

   1. [[https://github.com/stakemori/sage-shell-mode][sage-shell-mode]]



** Installation and sample configuration

   You can install =ob-sagemath= from [[https://github.com/milkypostman/melpa.git][MELPA]].

   =ob-sagemath= requires [[https://github.com/stakemori/sage-shell-mode][sage-shell-mode]].

   See [[https://github.com/stakemori/sage-shell-mode#installation-and-setup][Installation and Setup]] to setup [[https://github.com/stakemori/sage-shell-mode][sage-shell-mode]].

   The following is a sample configuration for =ob-sagemath=. Put these lines in your "~/.emacs.d/init.el".



#+begin_src emacs-lisp

  ;; Ob-sagemath supports only evaluating with a session.

  (setq org-babel-default-header-args:sage '((:session . t)

                                             (:results . "output")))



  ;; C-c c for asynchronous evaluating (only for SageMath code blocks).

  (with-eval-after-load "org"

    (define-key org-mode-map (kbd "C-c c") 'ob-sagemath-execute-async))



  ;; Do not confirm before evaluation

  (setq org-confirm-babel-evaluate nil)



  ;; Do not evaluate code blocks when exporting.

  (setq org-export-babel-evaluate nil)



  ;; Show images when opening a file.

  (setq org-startup-with-inline-images t)



  ;; Show images after evaluating code blocks.

  (add-hook 'org-babel-after-execute-hook 'org-display-inline-images)

#+end_src



** Example file

   Here is an example org file.



   [[file:./example.org][example.org]]



** Session

    ob-sagemath currently supports only evaluating with a session by using [[https://github.com/stakemori/sage-shell-mode][sage-shell-mode]].

    So like in the sample configuration, you have to provide the =:session= header argument.

    Usually, code blocks are evaluated in the =*Sage*= process buffer.

    If the =:session= argument is provided and it is a string, then the code block is evaluated in

    another process buffer.

    For example, by evaluating the following code block, a process buffer =*Sage*= is created and

    the code block is evaluated in the process buffer.



#+BEGIN_EXAMPLE

  ,#+BEGIN_SRC  sage :session foo

    print 'This code will be evaluated in the process buffer *Sage*.'

  ,#+END_SRC

#+END_EXAMPLE



** Asynchronous evaluation

   You can evaluate SageMath code blocks by =C-c C-c= (bound to =org-ctrl-c-ctrl-c=) like in other org-babel packages.

   But usually it blocks user inputs. In the sample configuration, =C-c c= is bound to =ob-sagemath-execute-async=.

   And it enables the asynchronous evaluation. So you can interact with Emacs during the evaluation.

   With a prefix argument, it evaluates all code blocks in a buffer.

   If the =org-mode= buffer is killed during the evaluation, the output will be lost.

   Please do not kill the =org-mode= buffer until the evaluation completes.



   Because =org-mode= doesn't provide a standard way for asynchronous evaluation,

   *this feature is unstable.*



** Images

   Image files of graphs can be embedded by providing the =:file= header argument.

   By evaluating the code block, the image file is stored in the file.

   Here is an example.



#+BEGIN_EXAMPLE

  ,#+BEGIN_SRC sage :file sin.png

    # You can change the size of the image by providing the figsize argument.

    plot(sin, [0, 2*pi], figsize=4)

  ,#+END_SRC



  ,#+RESULTS:

  [[file:sin.png]]

#+END_EXAMPLE



   If the =:file= header argument is not provided and the =:results= header argument contains =file=,

   then the code block returns a temporally file name.

   SageMath deletes these temporally files when the process exits.



#+BEGIN_EXAMPLE

  ,#+BEGIN_SRC sage :results file

    plot(sin, [0, 2*pi])

  ,#+END_SRC

#+END_EXAMPLE



** Tables

   If the =:results= header argument contains =table= and the output looks like a table

   (a list/tuple of lists/tuples), then the result is converted to a table.



#+BEGIN_EXAMPLE

  ,#+BEGIN_SRC sage :results table :colnames '(Fruit Price)

    [("Apple", 300), ("Banana", 200), ("Orange", 300)]

  ,#+END_SRC



  ,#+RESULTS:

  | Fruit  | Price |

  |--------+-------|

  | Apple  |   300 |

  | Banana |   200 |

  | Orange |   300 |

#+END_EXAMPLE



** Kill evaluation

   To kill the evaluation, switch to the process buffer (usually its buffer name is =*Sage*=),

   and hit =C-c C-c= (bound to =sage-shell:interrupt-subjob=).



** Issues or pull requests

   I am new to org-babel. There may be missing features. Feel free to post issues or send pull requests.