Re: [babel] maxima support?

["Eric Schulte" <schulte.eric@gmail.com>]

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Eric S Fraga <e.fraga@ucl.ac.uk> writes:

> "Eric Schulte" <schulte.eric@gmail.com> writes:
>
> [...]
>
>>
>> Ah, I see the problem, I used let instead of let*.  Please try this
>> updated version of the patch.  Sorry I would test this myself, but I
>> don't have Maxima installed.
>
> No problem at all!  I'm happy to test this as many times as necessary.
>
> In any case, this works fine in that maxima is indeed evaluated and
> output is returned.  However, two problems arise:
>
> 1. lines of the form "rat: replaced XXX by YYY = ZZZ" are not deleted
>    (as used to be by the grep -v replaced hack I had in the original
>    ob-maxima).  Essentially, we need to ignore output lines that match
>    the regex "^rat: replaced .*$" (I think this should do it...).
>
> 2. The output is converted to an org table:
>

The attached should fix both of these problems.  Please let me know how
this works.

Thanks -- Eric


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From 839612902cc1a0887f4e12cf408f3c8594b01599 Mon Sep 17 00:00:00 2001
From: Eric Schulte <schulte.eric@gmail.com>
Date: Mon, 14 Mar 2011 15:20:05 -0600
Subject: [PATCH] adding support for Maxima code blocks -- thanks to Eric Fraga

---
 lisp/ob-maxima.el |   80 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 lisp/org.el       |    1 +
 2 files changed, 81 insertions(+), 0 deletions(-)
 create mode 100644 lisp/ob-maxima.el

diff --git a/lisp/ob-maxima.el b/lisp/ob-maxima.el
new file mode 100644
index 0000000..e8b2df4
--- /dev/null
+++ b/lisp/ob-maxima.el
@@ -0,0 +1,80 @@
+;;; org-babel-maxima.el --- org-babel functions for maxima evaluation
+
+;; Copyright (c) 2009, 2010, 2011 Eric S Fraga, Eric Schulte
+
+;; Author: Eric S Fraga, Eric Schulte
+;; Keywords: literate programming, reproducible research, maxima
+;; Homepage: http://orgmode.org
+;; Version: 0.01
+
+;;; License:
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; Org-Babel support for evaluating maxima entries.
+;;
+;; This differs from most standard languages in that
+;;
+;; 1) there is no such thing as a "session" in maxima
+;;
+;; 2) we are generally only going to return output from maxima
+;;
+;; 3) we are adding the "cmdline" header argument
+;;
+;; 4) there are no variables
+
+;;; Code:
+(require 'ob)
+
+(defvar org-babel-default-header-args:maxima '())
+
+(defun org-babel-maxima-expand (body params)
+  "Expand a block of Maxima code according to its header arguments."
+  body)
+
+(defun org-babel-execute:maxima (body params)
+  "Execute a block of Maxima entries with org-babel.  This function is
+called by `org-babel-execute-src-block'."
+  (message "executing Maxima source code block")
+  (let* ((result-params (split-string (or (cdr (assoc :results params)) "")))
+	 (cmdline (cdr (assoc :cmdline params)))
+	 (in-file (org-babel-temp-file "maxima-"))
+	 (cmd (format "maxima --very-quiet -r 'batchload(%S)$' %s"
+		      in-file cmdline)))
+    (with-temp-file in-file (insert body))
+    (message cmd)
+    ((lambda (raw) ;; " | grep -v batch | grep -v 'replaced' | sed '/^$/d' "
+       (mapconcat
+	identity
+	(delq nil
+	      (mapcar (lambda (line)
+			(unless (or (string-match "batch" line)
+				    (string-match "^rat: replaced .*$" line)
+				    (= 0 (length line)))
+			  line))
+		      (split-string raw))) "\n"))
+     (org-babel-eval cmd ""))))
+
+(defun org-babel-prep-session:maxima (session params)
+  (error "Maxima does not support sessions"))
+
+(provide 'ob-maxima)
+
+;; arch-tag: d86c97ac-7eab-4349-8d8b-302dd09779a8
+
+;;; org-babel-maxima.el ends here
diff --git a/lisp/org.el b/lisp/org.el
index 96ad8ff..ae0ef5e 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -164,6 +164,7 @@ requirements) is loaded."
 		 (const :tag "Javascript" js)
 		 (const :tag "Latex" latex)
 		 (const :tag "Ledger" ledger)
+		 (const :tag "Maxima" maxima)
 		 (const :tag "Matlab" matlab)
 		 (const :tag "Mscgen" mscgen)
 		 (const :tag "Ocaml" ocaml)
-- 
1.7.1


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>
> *** simple test
>     #+begin_src maxima :results value
> programmode: false;
> eq: x**2-1 = 0;
> solution: solve(eq, x);
> print(solution);
>     #+end_src
>
>     #+results:
>     | solve: | solution: | x | = | - | 1 | x | = | 1 | [%t1, | %t2] |
>
> This isn't necessary appropriate in this case...  but I guess this is
> now a matter of adding all the normal frills given that the basic
> functionality is there?
>
> Thanks!