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+;;; ob-abc.el --- org-babel functions for template evaluation
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+
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+;; Copyright (C) Free Software Foundation
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+
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+;; Author: William Waites
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+;; Keywords: literate programming, music
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+;; Homepage: http://www.tardis.ed.ac.uk/wwaites
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+;; Version: 0.01
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+
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+;;; License:
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+
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+;; This program 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, or (at your option)
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+;; any later version.
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+;;
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+;; This program 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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+;;
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+;; You should have received a copy of the GNU General Public License
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+;; along with GNU Emacs; see the file COPYING. If not, write to the
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+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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+;; Boston, MA 02110-1301, USA.
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+
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+;;; Commentary:
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+
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+;;; This file adds support to Org Babel for music in ABC notation.
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+;;; It requires that the abcm2ps program is installed.
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+;;; See http://moinejf.free.fr/
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+
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+(require 'ob)
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+
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+;; optionally define a file extension for this language
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+(add-to-list 'org-babel-tangle-lang-exts '("abc" . "abc"))
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+
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+;; optionally declare default header arguments for this language
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+(defvar org-babel-default-header-args:abc
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+ '((:results . "file") (:exports . "results"))
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+ "Default arguments to use when evaluating an ABC source block.")
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+
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+(defun org-babel-expand-body:abc (body params)
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+ "Expand BODY according to PARAMS, return the expanded body."
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+ (let ((vars (mapcar #'cdr (org-babel-get-header params :var))))
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+ (mapc
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+ (lambda (pair)
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+ (let ((name (symbol-name (car pair)))
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+ (value (cdr pair)))
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+ (setq body
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+ (replace-regexp-in-string
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+ (concat "\$" (regexp-quote name))
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+ (if (stringp value) value (format "%S" value))
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+ body))))
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+ vars)
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+ body))
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+
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+(defun org-babel-execute:abc (body params)
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+ "Execute a block of ABC code with org-babel. This function is
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+ called by `org-babel-execute-src-block'"
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+ (message "executing Abc source code block")
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+ (let* ((result-params (split-string (or (cdr (assoc :results params)))))
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+ (cmdline (cdr (assoc :cmdline params)))
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+ (out-file ((lambda (el)
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+ (or el
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+ (error "abc code block requires :file header argument")))
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+ ;;; For SVG or EPS output, abcm2ps will add a number for a particular page
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+ ;;; automatically. This needs to be specified in the :file argument and stripped
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+ ;;; stripped out here. There is likely a better way to do this.
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+ (replace-regexp-in-string "001" "" (cdr (assoc :file params)))))
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+ (in-file (org-babel-temp-file "abc-"))
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+ (cmd (concat "abcm2ps" " " cmdline
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+ " -O " (org-babel-process-file-name out-file)
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+ " " (org-babel-process-file-name in-file))))
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+ (with-temp-file in-file (insert (org-babel-expand-body:abc body params)))
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+ (org-babel-eval cmd "")
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+ ;;; indicate that the file has been written
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+ nil))
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+
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+;; This function should be used to assign any variables in params in
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+;; the context of the session environment.
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+(defun org-babel-prep-session:abc (session params)
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+ "Return an error because abc does not support sessions."
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+ (error "ABC does not support sessions"))
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+
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+(provide 'ob-abc)
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+;;; ob-abc.el ends here
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William Waites