;;; ob-clojure.el --- org-babel functions for clojure evaluation

;; Copyright (C) 2009-2013 Free Software Foundation, Inc.

;; Author: Oleh Krehel
;; 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 nrepl for eval

;;; Requirements:

;;; - clojure
;;; - clojure-mode
;;; - nrepl

;;; Best way to get clojure is with https://github.com/technomancy/leiningen
;;; Best way to get nrepl is from MELPA (clojure-mode is a dependency).

;;; Code:
(require 'ob)
(require 'ob-tangle)

(defvar org-babel-tangle-lang-exts)
(add-to-list 'org-babel-tangle-lang-exts '("clojure" . "clj"))

(defvar org-babel-default-header-args:clojure
  '((:results . "value") (:tangle . "yes")))

(defun org-babel-execute:clojure (body params)
  "Execute a block of Clojure code with Babel and nREPL."
  (require 'nrepl)
  (if (nrepl-current-connection-buffer)
      (let* ((result (nrepl-eval body))
             (s (plist-get result :stdout))
             (r (plist-get result :value)))
        (if s (concat s "\n" r) r))
    (error "nREPL not connected! Use M-x nrepl-jack-in.")))

(provide 'ob-clojure-nrepl)

;;; ob-clojure-nrepl.el ends here