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+;;; ob-vala.el --- Babel functions for Vala evaluation -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2017 Free Software Foundation, Inc.
+
+;; Author: Christian Garbs <mitch@cgarbs.de>
+;; Keywords: literate programming, reproducible research
+;; Homepage: http://orgmode.org
+
+;;; License:
+
+;; 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 <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; ob-vala.el provides Babel support for the Vala language
+;; (see http://live.gnome.org/Vala for details)
+
+;;; Requirements:
+
+;; - Vala compiler binary (valac)
+;; - Vala development environment (Vala libraries etc.)
+;;
+;; vala-mode.el is nice to have for code formatting, but is not needed
+;; for ob-vala.el
+
+;;; Code:
+
+(require 'ob)
+
+(declare-function org-trim "org" (s &optional keep-lead))
+
+;; File extension.
+(add-to-list 'org-babel-tangle-lang-exts '("vala" . "vala"))
+
+;; Header arguments empty by default.
+(defvar org-babel-default-header-args:vala '())
+
+(defcustom org-babel-vala-compiler "valac"
+ "Command used to compile a C source code file into an executable.
+May be either a command in the path, like \"valac\"
+or an absolute path name, like \"/usr/local/bin/valac\".
+Parameters may be used like this: \"valac -v\""
+ :group 'org-babel
+ :version "26.1"
+ :package-version '(Org . "9.1")
+ :type 'string)
+
+;; This is the main function which is called to evaluate a code
+;; block.
+;;
+;; - run Vala compiler and create a binary in a temporary file
+;; - compiler/linker flags can be set via :flags header argument
+;; - if compilation succeeded, run the binary
+;; - commandline parameters to the binary can be set via :cmdline
+;; header argument
+;; - stdout will be parsed as RESULT (control via :result-params
+;; header argument)
+;;
+;; There is no session support because Vala is a compiled language.
+;;
+;; This function is heavily based on ob-C.el
+(defun org-babel-execute:vala (body params)
+ "Execute a block of Vala code with Babel.
+This function is called by `org-babel-execute-src-block'."
+ (message "executing Vala source code block")
+ (let* ((tmp-src-file (org-babel-temp-file
+ "vala-src-"
+ ".vala"))
+ (tmp-bin-file (org-babel-temp-file "vala-bin-" org-babel-exeext))
+ (cmdline (cdr (assq :cmdline params)))
+ (flags (cdr (assq :flags params))))
+ (with-temp-file tmp-src-file (insert body))
+ (org-babel-eval
+ (format "%s %s -o %s %s"
+ org-babel-vala-compiler
+ (mapconcat #'identity
+ (if (listp flags) flags (list flags)) " ")
+ (org-babel-process-file-name tmp-bin-file)
+ (org-babel-process-file-name tmp-src-file)) "")
+ (when (file-executable-p tmp-bin-file)
+ (let ((results
+ (org-trim
+ (org-babel-eval
+ (concat tmp-bin-file (if cmdline (concat " " cmdline) "")) ""))))
+ (org-babel-reassemble-table
+ (org-babel-result-cond (cdr (assq :result-params params))
+ (org-babel-read results)
+ (let ((tmp-file (org-babel-temp-file "vala-")))
+ (with-temp-file tmp-file (insert results))
+ (org-babel-import-elisp-from-file tmp-file)))
+ (org-babel-pick-name
+ (cdr (assq :colname-names params)) (cdr (assq :colnames params)))
+ (org-babel-pick-name
+ (cdr (assq :rowname-names params)) (cdr (assq :rownames params))))))))
+
+(defun org-babel-prep-session:vala (_session _params)
+ "Prepare a session.
+This function does nothing as Vala is a compiled language with no
+support for sessions."
+ (error "Vala is a compiled language -- no support for sessions"))
+
+(provide 'ob-vala)
+
+;;; ob-vala.el ends here