;;; ob-vala.el --- Babel functions for Vala evaluation -*- lexical-binding: t; -*-
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;; Copyright (C) 2017-2018 Free Software Foundation, Inc.
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;; Author: Christian Garbs <mitch@cgarbs.de>
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;; Keywords: literate programming, reproducible research
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;; Homepage: https://orgmode.org
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;;; License:
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; ob-vala.el provides Babel support for the Vala language
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;; (see http://live.gnome.org/Vala for details)
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;;; Requirements:
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;; - Vala compiler binary (valac)
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;; - Vala development environment (Vala libraries etc.)
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;;
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;; vala-mode.el is nice to have for code formatting, but is not needed
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;; for ob-vala.el
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;;; Code:
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(require 'ob)
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(declare-function org-trim "org" (s &optional keep-lead))
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;; File extension.
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(add-to-list 'org-babel-tangle-lang-exts '("vala" . "vala"))
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;; Header arguments empty by default.
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(defvar org-babel-default-header-args:vala '())
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(defcustom org-babel-vala-compiler "valac"
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"Command used to compile a C source code file into an executable.
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May be either a command in the path, like \"valac\"
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or an absolute path name, like \"/usr/local/bin/valac\".
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Parameters may be used like this: \"valac -v\""
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:group 'org-babel
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:version "26.1"
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:package-version '(Org . "9.1")
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:type 'string)
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;; This is the main function which is called to evaluate a code
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;; block.
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;;
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;; - run Vala compiler and create a binary in a temporary file
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;; - compiler/linker flags can be set via :flags header argument
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;; - if compilation succeeded, run the binary
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;; - commandline parameters to the binary can be set via :cmdline
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;; header argument
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;; - stdout will be parsed as RESULT (control via :result-params
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;; header argument)
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;;
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;; There is no session support because Vala is a compiled language.
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;;
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;; This function is heavily based on ob-C.el
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(defun org-babel-execute:vala (body params)
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"Execute a block of Vala code with Babel.
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This function is called by `org-babel-execute-src-block'."
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(message "executing Vala source code block")
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(let* ((tmp-src-file (org-babel-temp-file
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"vala-src-"
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".vala"))
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(tmp-bin-file (org-babel-temp-file "vala-bin-" org-babel-exeext))
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(cmdline (cdr (assq :cmdline params)))
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(flags (cdr (assq :flags params))))
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(with-temp-file tmp-src-file (insert body))
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(org-babel-eval
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(format "%s %s -o %s %s"
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org-babel-vala-compiler
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(mapconcat #'identity
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(if (listp flags) flags (list flags)) " ")
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(org-babel-process-file-name tmp-bin-file)
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(org-babel-process-file-name tmp-src-file)) "")
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(when (file-executable-p tmp-bin-file)
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(let ((results
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(org-trim
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(org-babel-eval
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(concat tmp-bin-file (if cmdline (concat " " cmdline) "")) ""))))
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(org-babel-reassemble-table
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(org-babel-result-cond (cdr (assq :result-params params))
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(org-babel-read results)
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(let ((tmp-file (org-babel-temp-file "vala-")))
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(with-temp-file tmp-file (insert results))
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(org-babel-import-elisp-from-file tmp-file)))
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(org-babel-pick-name
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(cdr (assq :colname-names params)) (cdr (assq :colnames params)))
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(org-babel-pick-name
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(cdr (assq :rowname-names params)) (cdr (assq :rownames params))))))))
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(defun org-babel-prep-session:vala (_session _params)
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"Prepare a session.
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This function does nothing as Vala is a compiled language with no
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support for sessions."
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(error "Vala is a compiled language -- no support for sessions"))
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(provide 'ob-vala)
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;;; ob-vala.el ends here
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