;;; ob-scala.el --- org-babel functions for Scala evaluation ;; Copyright (C) 2012-2013 Free Software Foundation, Inc. ;; Author: Andrzej Lichnerowicz ;; 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: ;; Currently only supports the external execution. No session support yet. ;;; Requirements: ;; - Scala language :: http://www.scala-lang.org/ ;; - Scala major mode :: Can be installed from Scala sources ;; https://github.com/scala/scala-dist/blob/master/tool-support/src/emacs/scala-mode.el ;;; Code: (require 'ob) (eval-when-compile (require 'cl)) (defvar org-babel-tangle-lang-exts) ;; Autoloaded (add-to-list 'org-babel-tangle-lang-exts '("scala" . "scala")) (defvar org-babel-default-header-args:scala '()) (defvar org-babel-scala-command "scala" "Name of the command to use for executing Scala code.") (defun org-babel-execute:scala (body params) "Execute a block of Scala code with org-babel. This function is called by `org-babel-execute-src-block'" (message "executing Scala source code block") (let* ((processed-params (org-babel-process-params params)) (session (org-babel-scala-initiate-session (nth 0 processed-params))) (vars (nth 1 processed-params)) (result-params (nth 2 processed-params)) (result-type (cdr (assoc :result-type params))) (full-body (org-babel-expand-body:generic body params)) (result (org-babel-scala-evaluate session full-body result-type result-params))) (org-babel-reassemble-table result (org-babel-pick-name (cdr (assoc :colname-names params)) (cdr (assoc :colnames params))) (org-babel-pick-name (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params)))))) (defun org-babel-scala-table-or-string (results) "Convert RESULTS into an appropriate elisp value. If RESULTS look like a table, then convert them into an Emacs-lisp table, otherwise return the results as a string." (org-babel-script-escape results)) (defvar org-babel-scala-wrapper-method "var str_result :String = null; Console.withOut(new java.io.OutputStream() {def write(b: Int){ }}) { str_result = { %s }.toString } print(str_result) ") (defun org-babel-scala-evaluate (session body &optional result-type result-params) "Evaluate BODY in external Scala process. If RESULT-TYPE equals 'output then return standard output as a string. If RESULT-TYPE equals 'value then return the value of the last statement in BODY as elisp." (when session (error "Sessions are not (yet) supported for Scala")) (case result-type (output (let ((src-file (org-babel-temp-file "scala-"))) (progn (with-temp-file src-file (insert body)) (org-babel-eval (concat org-babel-scala-command " " src-file) "")))) (value (let* ((src-file (org-babel-temp-file "scala-")) (wrapper (format org-babel-scala-wrapper-method body))) (with-temp-file src-file (insert wrapper)) ((lambda (raw) (org-babel-result-cond result-params raw (org-babel-scala-table-or-string raw))) (org-babel-eval (concat org-babel-scala-command " " src-file) "")))))) (defun org-babel-prep-session:scala (session params) "Prepare SESSION according to the header arguments specified in PARAMS." (error "Sessions are not (yet) supported for Scala")) (defun org-babel-scala-initiate-session (&optional session) "If there is not a current inferior-process-buffer in SESSION then create. Return the initialized session. Sessions are not supported in Scala." nil) (provide 'ob-scala) ;;; ob-scala.el ends here