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| | ;;; ob-table.el --- support for calling org-babel functions from tables
;; Copyright (C) 2009-2011 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
;; This file is part of GNU Emacs.
;; GNU Emacs 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 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Should allow calling functions from org-mode tables using the
;; function `sbe' as so...
;; #+begin_src emacs-lisp :results silent
;; (defun fibbd (n) (if (< n 2) 1 (+ (fibbd (- n 1)) (fibbd (- n 2)))))
;; #+end_src
;; #+name: fibbd
;; #+begin_src emacs-lisp :var n=2 :results silent
;; (fibbd n)
;; #+end_src
;; | original | fibbd |
;; |----------+--------|
;; | 0 | |
;; | 1 | |
;; | 2 | |
;; | 3 | |
;; | 4 | |
;; | 5 | |
;; | 6 | |
;; | 7 | |
;; | 8 | |
;; | 9 | |
;; #+TBLFM: $2='(sbe 'fibbd (n $1))
;;; Code:
(require 'ob)
(defun org-babel-table-truncate-at-newline (string)
"Replace newline character with ellipses.
If STRING ends in a newline character, then remove the newline
character and replace it with ellipses."
(if (and (stringp string) (string-match "[\n\r]\\(.\\)?" string))
(concat (substring string 0 (match-beginning 0))
(if (match-string 1 string) "...")) string))
(defmacro sbe (source-block &rest variables)
"Return the results of calling SOURCE-BLOCK with VARIABLES.
Each element of VARIABLES should be a two
element list, whose first element is the name of the variable and
second element is a string of its value. The following call to
`sbe' would be equivalent to the following source code block.
(sbe 'source-block (n $2) (m 3))
#+begin_src emacs-lisp :var results=source-block(n=val_at_col_2, m=3) :results silent
results
#+end_src
NOTE: by default string variable names are interpreted as
references to source-code blocks, to force interpretation of a
cell's value as a string, prefix the identifier with two \"$\"s
rather than a single \"$\" (i.e. \"$$2\" instead of \"$2\" in the
example above.
NOTE: it is also possible to pass header arguments to the code
block. In this case a table cell should hold the string value of
the header argument which can then be passed before all variables
as shown in the example below.
| 1 | 2 | :file nothing.png | nothing.png |
#+TBLFM: @1$4='(sbe test-sbe $3 (x $1) (y $2))"
(let* ((header-args (if (stringp (car variables)) (car variables) ""))
(variables (if (stringp (car variables)) (cdr variables) variables)))
(let* (quote
(variables
(mapcar
(lambda (var)
;; ensure that all cells prefixed with $'s are strings
(cons (car var)
(delq nil (mapcar
(lambda (el)
(if (eq '$ el)
(setq quote t)
(prog1 (if quote
(format "\"%s\"" el)
(org-babel-clean-text-properties el))
(setq quote nil))))
(cdr var)))))
variables)))
(unless (stringp source-block)
(setq source-block (symbol-name source-block)))
((lambda (result)
(org-babel-trim (if (stringp result) result (format "%S" result))))
(if (and source-block (> (length source-block) 0))
(let ((params
(eval `(org-babel-parse-header-arguments
(concat
":var results="
,source-block
"[" ,header-args "]"
"("
(mapconcat
(lambda (var-spec)
(if (> (length (cdr var-spec)) 1)
(format "%S='%S"
(car var-spec)
(mapcar #'read (cdr var-spec)))
(format "%S=%s"
(car var-spec) (cadr var-spec))))
',variables ", ")
")")))))
(org-babel-execute-src-block
nil (list "emacs-lisp" "results" params)
'((:results . "silent"))))
"")))))
(def-edebug-spec sbe (form form))
(provide 'ob-table)
;;; ob-table.el ends here
|