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;;; ob-clojure.el --- org-babel functions for clojure evaluation
;; Copyright (C) 2009-2012 Free Software Foundation, Inc.
;; Author: Joel Boehland
;; 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:
;;; support for evaluating clojure code, relies on slime for all eval
;;; Requirements:
;;; - clojure (at least 1.2.0)
;;; - clojure-mode
;;; - slime
;;; By far, the best way to install these components is by following
;;; the directions as set out by Phil Hagelberg (Technomancy) on the
;;; web page: http://technomancy.us/126
;;; Code:
(require 'ob)
(declare-function slime-eval "ext:slime" (sexp &optional package))
(defvar org-babel-tangle-lang-exts)
(add-to-list 'org-babel-tangle-lang-exts '("clojure" . "clj"))
(defvar org-babel-default-header-args:clojure '())
(defvar org-babel-header-args:clojure '((package . :any)))
(defun org-babel-expand-body:clojure (body params)
"Expand BODY according to PARAMS, return the expanded body."
(let* ((vars (mapcar #'cdr (org-babel-get-header params :var)))
(result-params (cdr (assoc :result-params params)))
(print-level nil) (print-length nil)
(body (org-babel-trim
(if (> (length vars) 0)
(concat "(let ["
(mapconcat
(lambda (var)
(format "%S (quote %S)" (car var) (cdr var)))
vars "\n ")
"]\n" body ")")
body))))
(cond ((or (member "code" result-params) (member "pp" result-params))
(format (concat "(let [org-mode-print-catcher (java.io.StringWriter.)] "
"(clojure.pprint/with-pprint-dispatch clojure.pprint/%s-dispatch "
"(clojure.pprint/pprint (do %s) org-mode-print-catcher) "
"(str org-mode-print-catcher)))")
(if (member "code" result-params) "code" "simple") body))
;; if (:results output), collect printed output
((member "output" result-params)
(format "(clojure.core/with-out-str %s)" body))
(t body))))
(defun org-babel-execute:clojure (body params)
"Execute a block of Clojure code with Babel."
(require 'slime)
(with-temp-buffer
(insert (org-babel-expand-body:clojure body params))
((lambda (result)
(let ((result-params (cdr (assoc :result-params params))))
(if (or (member "scalar" result-params)
(member "verbatim" result-params))
result
(condition-case nil (org-babel-script-escape result)
(error result)))))
(slime-eval
`(swank:eval-and-grab-output
,(buffer-substring-no-properties (point-min) (point-max)))
(cdr (assoc :package params))))))
(provide 'ob-clojure)
;;; ob-clojure.el ends here
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