lisp/ob-vala.el

   1 ;;; ob-vala.el --- Babel functions for Vala evaluation -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2017 Free Software Foundation, Inc.
   4
   5 ;; Author: Christian Garbs <mitch@cgarbs.de>
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://orgmode.org
   8
   9 ;;; License:
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software: you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation, either version 3 of the License, or
  16 ;; (at your option) any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  25
  26 ;;; Commentary:
  27
  28 ;; ob-vala.el provides Babel support for the Vala language
  29 ;; (see http://live.gnome.org/Vala for details)
  30
  31 ;;; Requirements:
  32
  33 ;; - Vala compiler binary (valac)
  34 ;; - Vala development environment (Vala libraries etc.)
  35 ;;
  36 ;; vala-mode.el is nice to have for code formatting, but is not needed
  37 ;; for ob-vala.el
  38
  39 ;;; Code:
  40
  41 (require 'ob)
  42
  43 (declare-function org-trim "org" (s &optional keep-lead))
  44
  45 ;; File extension.
  46 (add-to-list 'org-babel-tangle-lang-exts '("vala" . "vala"))
  47
  48 ;; Header arguments empty by default.
  49 (defvar org-babel-default-header-args:vala '())
  50
  51 (defcustom org-babel-vala-compiler "valac"
  52   "Command used to compile a C source code file into an executable.
  53 May be either a command in the path, like \"valac\"
  54 or an absolute path name, like \"/usr/local/bin/valac\".
  55 Parameters may be used like this: \"valac -v\""
  56   :group 'org-babel
  57   :version "26.1"
  58   :package-version '(Org . "9.1")
  59   :type 'string)
  60
  61 ;; This is the main function which is called to evaluate a code
  62 ;; block.
  63 ;;
  64 ;; - run Vala compiler and create a binary in a temporary file
  65 ;;   - compiler/linker flags can be set via :flags header argument
  66 ;; - if compilation succeeded, run the binary
  67 ;;   - commandline parameters to the binary can be set via :cmdline
  68 ;;     header argument
  69 ;;   - stdout will be parsed as RESULT (control via :result-params
  70 ;;     header argument)
  71 ;;
  72 ;; There is no session support because Vala is a compiled language.
  73 ;;
  74 ;; This function is heavily based on ob-C.el
  75 (defun org-babel-execute:vala (body params)
  76   "Execute a block of Vala code with Babel.
  77 This function is called by `org-babel-execute-src-block'."
  78   (message "executing Vala source code block")
  79   (let* ((tmp-src-file (org-babel-temp-file
  80                         "vala-src-"
  81                         ".vala"))
  82          (tmp-bin-file (org-babel-temp-file "vala-bin-" org-babel-exeext))
  83          (cmdline (cdr (assq :cmdline params)))
  84          (flags (cdr (assq :flags params))))
  85     (with-temp-file tmp-src-file (insert body))
  86     (org-babel-eval
  87      (format "%s %s -o %s %s"
  88              org-babel-vala-compiler
  89              (mapconcat #'identity
  90                         (if (listp flags) flags (list flags)) " ")
  91              (org-babel-process-file-name tmp-bin-file)
  92              (org-babel-process-file-name tmp-src-file)) "")
  93     (when (file-executable-p tmp-bin-file)
  94         (let ((results
  95                (org-trim
  96                 (org-babel-eval
  97                  (concat tmp-bin-file (if cmdline (concat " " cmdline) "")) ""))))
  98           (org-babel-reassemble-table
  99            (org-babel-result-cond (cdr (assq :result-params params))
 100              (org-babel-read results)
 101              (let ((tmp-file (org-babel-temp-file "vala-")))
 102                (with-temp-file tmp-file (insert results))
 103                (org-babel-import-elisp-from-file tmp-file)))
 104            (org-babel-pick-name
 105             (cdr (assq :colname-names params)) (cdr (assq :colnames params)))
 106            (org-babel-pick-name
 107             (cdr (assq :rowname-names params)) (cdr (assq :rownames params))))))))
 108
 109 (defun org-babel-prep-session:vala (_session _params)
 110   "Prepare a session.
 111 This function does nothing as Vala is a compiled language with no
 112 support for sessions."
 113   (error "Vala is a compiled language -- no support for sessions"))
 114
 115 (provide 'ob-vala)
 116
 117 ;;; ob-vala.el ends here