ob-core: fix bug when source block is at bob
[org-mode.git] / lisp / ob-scala.el
blob7df8da82b7d37b808d4c4642ca73319f915d0055
1 ;;; ob-scala.el --- org-babel functions for Scala evaluation
3 ;; Copyright (C) 2012-2016 Free Software Foundation, Inc.
5 ;; Author: Andrzej Lichnerowicz
6 ;; Keywords: literate programming, reproducible research
7 ;; Homepage: http://orgmode.org
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software: you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation, either version 3 of the License, or
14 ;; (at your option) any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
24 ;;; Commentary:
25 ;; Currently only supports the external execution. No session support yet.
27 ;;; Requirements:
28 ;; - Scala language :: http://www.scala-lang.org/
29 ;; - Scala major mode :: Can be installed from Scala sources
30 ;; https://github.com/scala/scala-dist/blob/master/tool-support/src/emacs/scala-mode.el
32 ;;; Code:
33 (require 'ob)
34 (eval-when-compile (require 'cl))
36 (defvar org-babel-tangle-lang-exts) ;; Autoloaded
37 (add-to-list 'org-babel-tangle-lang-exts '("scala" . "scala"))
38 (defvar org-babel-default-header-args:scala '())
39 (defvar org-babel-scala-command "scala"
40 "Name of the command to use for executing Scala code.")
42 (defun org-babel-execute:scala (body params)
43 "Execute a block of Scala code with org-babel. This function is
44 called by `org-babel-execute-src-block'"
45 (message "executing Scala source code block")
46 (let* ((processed-params (org-babel-process-params params))
47 (session (org-babel-scala-initiate-session (nth 0 processed-params)))
48 (vars (nth 1 processed-params))
49 (result-params (nth 2 processed-params))
50 (result-type (cdr (assoc :result-type params)))
51 (full-body (org-babel-expand-body:generic
52 body params))
53 (result (org-babel-scala-evaluate
54 session full-body result-type result-params)))
56 (org-babel-reassemble-table
57 result
58 (org-babel-pick-name
59 (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
60 (org-babel-pick-name
61 (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
63 (defvar org-babel-scala-wrapper-method
65 "var str_result :String = null;
67 Console.withOut(new java.io.OutputStream() {def write(b: Int){
68 }}) {
69 str_result = {
71 }.toString
74 print(str_result)
78 (defun org-babel-scala-evaluate
79 (session body &optional result-type result-params)
80 "Evaluate BODY in external Scala process.
81 If RESULT-TYPE equals `output' then return standard output as a string.
82 If RESULT-TYPE equals `value' then return the value of the last statement
83 in BODY as elisp."
84 (when session (error "Sessions are not (yet) supported for Scala"))
85 (case result-type
86 (output
87 (let ((src-file (org-babel-temp-file "scala-")))
88 (progn (with-temp-file src-file (insert body))
89 (org-babel-eval
90 (concat org-babel-scala-command " " src-file) ""))))
91 (value
92 (let* ((src-file (org-babel-temp-file "scala-"))
93 (wrapper (format org-babel-scala-wrapper-method body)))
94 (with-temp-file src-file (insert wrapper))
95 (let ((raw (org-babel-eval
96 (concat org-babel-scala-command " " src-file) "")))
97 (org-babel-result-cond result-params
98 raw
99 (org-babel-script-escape raw)))))))
102 (defun org-babel-prep-session:scala (session params)
103 "Prepare SESSION according to the header arguments specified in PARAMS."
104 (error "Sessions are not (yet) supported for Scala"))
106 (defun org-babel-scala-initiate-session (&optional session)
107 "If there is not a current inferior-process-buffer in SESSION
108 then create. Return the initialized session. Sessions are not
109 supported in Scala."
110 nil)
112 (provide 'ob-scala)
116 ;;; ob-scala.el ends here