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+;;; ob-abc.el --- org-babel functions for template evaluation
+;; Copyright (C) Free Software Foundation
+;; Author: William Waites
+;; Keywords: literate programming, music
+;; Homepage: http://www.tardis.ed.ac.uk/wwaites
+;; Version: 0.01
+;; This program 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, or (at your option)
+;; any later version.
+;; This program 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; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+;;; This file adds support to Org Babel for music in ABC notation.
+;;; It requires that the abcm2ps program is installed.
+;;; See http://moinejf.free.fr/
+;; optionally define a file extension for this language
+(add-to-list 'org-babel-tangle-lang-exts '("abc" . "abc"))
+;; optionally declare default header arguments for this language
+ '((:results . "file") (:exports . "results"))
+ "Default arguments to use when evaluating an ABC source block.")
+(defun org-babel-expand-body:abc (body params)
+ "Expand BODY according to PARAMS, return the expanded body."
+ (let ((vars (mapcar #'cdr (org-babel-get-header params :var))))
+ (lambda (pair)
+ (let ((name (symbol-name (car pair)))
+ (value (cdr pair)))
+ (setq body
+ (concat "\$" (regexp-quote name))
+ (if (stringp value) value (format "%S" value))
+(defun org-babel-execute:abc (body params)
+ "Execute a block of ABC code with org-babel. This function is
+ called by `org-babel-execute-src-block'"
+ (message "executing Abc source code block")
+ (let* ((result-params (split-string (or (cdr (assoc :results params)))))
+ (cmdline (cdr (assoc :cmdline params)))
+ (out-file ((lambda (el)
+ (or el
+ (error "abc code block requires :file header argument")))
+ (replace-regexp-in-string "\.pdf$" ".ps" (cdr (assoc :file params)))))
+ (in-file (org-babel-temp-file "abc-"))
+ (render (concat "abcm2ps" " " cmdline
+ " -O " (org-babel-process-file-name out-file)
+ " " (org-babel-process-file-name in-file))))
+ (with-temp-file in-file (insert (org-babel-expand-body:abc body params)))
+ (org-babel-eval render "")
+ ;;; handle where abcm2ps changes the file name (to support multiple files
+ (when (or (string= (file-name-extension out-file) "eps")
+ (string= (file-name-extension out-file) "svg"))
+ (rename-file (concat
+ (file-name-sans-extension out-file) "001."
+ (file-name-extension out-file))
+ out-file t))
+ ;;; if we were asked for a pdf...
+ (when (string= (file-name-extension (cdr (assoc :file params))) "pdf")
+ (org-babel-eval (concat "ps2pdf" " " out-file " " (cdr (assoc :file params))) ""))
+ ;;; indicate that the file has been written
+;; This function should be used to assign any variables in params in
+;; the context of the session environment.
+(defun org-babel-prep-session:abc (session params)
+ "Return an error because abc does not support sessions."
+ (error "ABC does not support sessions"))
+;;; ob-abc.el ends here