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elpa/org-20171204/ob-vala.el

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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