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+;;; ob-shen.el --- org-babel functions for Shen
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+
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+;; Copyright (C) 2010-2011 Free Software Foundation
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+
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+;; Author: Eric Schulte
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+;; Keywords: literate programming, reproducible research, shen
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+;; Homepage: http://orgmode.org
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+
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+;; This file is part of GNU Emacs.
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+
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+;; GNU Emacs is free software: you can redistribute it and/or modify
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+;; it under the terms of the GNU General Public License as published by
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+;; the Free Software Foundation, either version 3 of the License, or
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+;; (at your option) any later version.
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+
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+;; GNU Emacs is distributed in the hope that it will be useful,
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+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+;; GNU General Public License for more details.
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+
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+;; You should have received a copy of the GNU General Public License
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+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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+
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+;;; Commentary:
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+
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+;; Currently this only works using session evaluation as there is no
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+;; defined method for executing shen code outside of a session.
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+
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+;;; Requirements:
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+
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+;; - shen-mode and inf-shen will soon be available through the GNU
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+;; elpa, however in the interim they are available at
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+;; https://github.com/eschulte/shen-mode
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+
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+;;; Code:
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+(require 'ob)
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+(require 'inf-shen)
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+
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+(defvar org-babel-default-header-args:shen '()
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+ "Default header arguments for shen code blocks.")
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+
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+(defun org-babel-expand-body:shen (body params)
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+ "Expand BODY according to PARAMS, return the expanded body."
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+ (let ((vars (mapcar #'cdr (org-babel-get-header params :var))))
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+ (if (> (length vars) 0)
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+ (concat "(let "
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+ (mapconcat (lambda (var)
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+ (format "%s %s" (car var)
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+ (org-babel-shen-var-to-shen (cdr var))))
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+ vars " ")
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+ body ")")
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+ body)))
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+
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+(defun org-babel-shen-var-to-shen (var)
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+ "Convert VAR into a shen variable."
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+ (if (listp var)
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+ (concat "[" (mapconcat #'org-babel-ruby-var-to-ruby var " ") "]")
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+ (format "%S" var)))
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+
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+(defun org-babel-execute:shen (body params)
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+ "Execute a block of Shen code with org-babel.
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+This function is called by `org-babel-execute-src-block'"
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+ (let* ((result-type (cdr (assoc :result-type params)))
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+ (full-body (org-babel-expand-body:shen body params)))
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+ ((lambda (results)
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+ (if (or (member 'scalar result-params)
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+ (member 'verbatim result-params))
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+ results
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+ (condition-case nil (org-babel-script-escape results)
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+ (error result))))
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+ (with-temp-buffer
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+ (insert full-body)
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+ (call-interactively #'shen-eval-defun)))))
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+
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+(provide 'ob-shen)
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+;;; ob-shen.el ends here
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Eric Schulte