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| | ;;; ob-table.el --- Support for Calling Babel Functions from Tables -*- lexical-binding: t; -*-
;; Copyright (C) 2009-2018 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Should allow calling functions from Org tables using the function
;; `org-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='(org-sbe "fibbd" (n $1))
;; NOTE: The quotation marks around the function name, 'fibbd' here,
;; are optional.
;;; Code:
(require 'ob-core)
(declare-function org-trim "org" (s &optional keep-lead))
(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))
(when (match-string 1 string) "...")) string))
(defmacro org-sbe (source-block &rest variables)
"Return the results of calling SOURCE-BLOCK with VARIABLES.
Each element of VARIABLES should be a list of two elements: the
first element is the name of the variable and second element is a
string of its value.
So this `org-sbe' construct
(org-sbe \"source-block\" (n $2) (m 3))
is the equivalent of the following source code block:
#+begin_src emacs-lisp :var results=source-block(n=val_at_col_2, m=3) :results silent
results
#+end_src
NOTE: The quotation marks around the function name,
'source-block', are optional.
NOTE: By default, string variable names are interpreted as
references to source-code blocks, to force interpretation of a
cell's value as a string, prefix the identifier a \"$\" (e.g.,
\"$$2\" instead of \"$2\" or \"$@2$2\" instead of \"@2$2\").
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=\\='(org-sbe test-sbe $3 (x $1) (y $2))"
(declare (debug (form form)))
(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)
(prog1 nil (setq quote t))
(prog1
(cond
(quote (format "\"%s\"" el))
((stringp el) (org-no-properties el))
(t el))
(setq quote nil))))
(cdr var)))))
variables)))
(unless (stringp source-block)
(setq source-block (symbol-name source-block)))
(let ((result
(if (and source-block (> (length source-block) 0))
(let ((params
;; FIXME: Why `eval'?!?!?
(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"))))
"")))
(org-trim (if (stringp result) result (format "%S" result)))))))
(provide 'ob-table)
;;; ob-table.el ends here
|