From 06bf0eb7fe9fa0446f586d785dd8c9bdd96950ae Mon Sep 17 00:00:00 2001
From: Eric Schulte <schulte.eric@gmail.com>
Date: Mon, 18 Jul 2011 10:07:49 -0600
Subject: [PATCH] ob-java: minimal support for evaluation of java code blocks

---
 Makefile        |  3 +-
 doc/org.texi    |  1 +
 lisp/ob-java.el | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
 lisp/org.el     |  1 +
 4 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100644 lisp/ob-java.el

diff --git a/Makefile b/Makefile
index c3a59d982..ce419c1cc 100644
--- a/Makefile
+++ b/Makefile
@@ -157,7 +157,8 @@ LISPF      = 	org.el			\
 		ob-org.el		\
 		ob-js.el		\
 		ob-scheme.el		\
-		ob-lilypond.el
+		ob-lilypond.el		\
+		ob-java.el
 
 LISPFILES0  = $(LISPF:%=lisp/%)
 LISPFILES   = $(LISPFILES0) lisp/org-install.el
diff --git a/doc/org.texi b/doc/org.texi
index e2af595f9..0e077bdf5 100644
--- a/doc/org.texi
+++ b/doc/org.texi
@@ -11890,6 +11890,7 @@ Code blocks in the following languages are supported.
 @item CSS @tab css @tab ditaa @tab ditaa
 @item Graphviz @tab dot @tab Emacs Lisp @tab emacs-lisp
 @item gnuplot @tab gnuplot @tab Haskell @tab haskell
+@item Java @tab java @tab @tab
 @item Javascript @tab js @tab LaTeX @tab latex 
 @item Ledger @tab ledger @tab Lisp @tab lisp 
 @item Lilypond @tab lilypond @tab MATLAB @tab matlab
diff --git a/lisp/ob-java.el b/lisp/ob-java.el
new file mode 100644
index 000000000..8e837602f
--- /dev/null
+++ b/lisp/ob-java.el
@@ -0,0 +1,74 @@
+;;; ob-java.el --- org-babel functions for java evaluation
+
+;; Copyright (C) 2011  Free Software Foundation, Inc.
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research
+;; Homepage: http://orgmode.org
+;; Version: 7.6
+
+;; 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 this only supports the external compilation and execution
+;; of java code blocks (i.e., no session support).
+
+;;; Code:
+(require 'ob)
+(require 'ob-eval)
+
+(defvar org-babel-tangle-lang-exts)
+(add-to-list 'org-babel-tangle-lang-exts '("java" . "java"))
+
+(defvar org-babel-java-command "java"
+  "Name of the java command.")
+
+(defvar org-babel-java-compiler "javac"
+  "Name of the java compiler.")
+
+(defun org-babel-execute:java (body params)
+  (let* ((classname (or (cdr (assoc :classname params))
+			(error
+			 "Can't compile a java block without a classname")))
+	 (packagename (file-name-directory classname))
+	 (src-file (concat classname ".java"))
+	 (full-body (org-babel-expand-body:generic body params))
+	 (compile
+	  (progn (with-temp-file src-file (insert full-body))
+		 (org-babel-eval
+		  (concat org-babel-java-compiler " " src-file) ""))))
+    ;; created package-name directories if missing
+    (unless (file-exists-p packagename)
+      (make-directory packagename 'parents))
+    ((lambda (results)
+       (org-babel-reassemble-table
+	(if (member "vector" (cdr (assoc :result-params params)))
+	    (let ((tmp-file (org-babel-temp-file "c-")))
+	      (with-temp-file tmp-file (insert results))
+	      (org-babel-import-elisp-from-file tmp-file))
+	  (org-babel-read results))
+	(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)))))
+     (org-babel-eval (concat org-babel-java-command " " classname) ""))))
+
+(provide 'ob-java)
+
+;; arch-tag: dd1cfb00-7f76-4ecf-922c-f7031b68b85e
+
+;;; ob-java.el ends here
diff --git a/lisp/org.el b/lisp/org.el
index 27be6a6bc..962b1b022 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -162,6 +162,7 @@ requirements) is loaded."
 		 (const :tag "Emacs Lisp" emacs-lisp)
 		 (const :tag "Gnuplot" gnuplot)
 		 (const :tag "Haskell" haskell)
+		 (const :tag "Java" java)
 		 (const :tag "Javascript" js)
 		 (const :tag "Latex" latex)
 		 (const :tag "Ledger" ledger)