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;;; ob-abc.el --- Org Babel Functions for ABC -*- lexical-binding: t; -*-
;; Copyright (C) 2013-2017 Free Software Foundation, Inc.
;; Author: William Waites
;; Keywords: literate programming, music
;; Homepage: http://www.tardis.ed.ac.uk/wwaites
;; Version: 0.01
;; 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:
;;; 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/
(require 'ob)
;; 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
(defvar org-babel-default-header-args:abc
'((: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 (org-babel--get-vars params)))
(mapc
(lambda (pair)
(let ((name (symbol-name (car pair)))
(value (cdr pair)))
(setq body
(replace-regexp-in-string
(concat "\$" (regexp-quote name))
(if (stringp value) value (format "%S" value))
body))))
vars)
body))
(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* ((cmdline (cdr (assq :cmdline params)))
(out-file (let ((file (cdr (assq :file params))))
(if file (replace-regexp-in-string "\.pdf$" ".ps" file)
(error "abc code block requires :file header argument"))))
(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 (assq :file params))) "pdf")
(org-babel-eval (concat "ps2pdf" " " out-file " " (cdr (assq :file params))) ""))
;;; indicate that the file has been written
nil))
;; 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"))
(provide 'ob-abc)
;;; ob-abc.el ends here
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