;;; ob-abc.el --- Org Babel Functions for ABC -*- lexical-binding: t; -*-
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;; Copyright (C) 2013-2018 Free Software Foundation, Inc.
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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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;; 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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;;; 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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(require 'ob)
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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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;; 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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(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 (org-babel--get-vars params)))
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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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(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* ((cmdline (cdr (assq :cmdline params)))
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(out-file (let ((file (cdr (assq :file params))))
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(if file (replace-regexp-in-string "\.pdf$" ".ps" file)
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(error "abc code block requires :file header argument"))))
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(in-file (org-babel-temp-file "abc-"))
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(render (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 render "")
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;;; handle where abcm2ps changes the file name (to support multiple files
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(when (or (string= (file-name-extension out-file) "eps")
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(string= (file-name-extension out-file) "svg"))
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(rename-file (concat
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(file-name-sans-extension out-file) "001."
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(file-name-extension out-file))
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out-file t))
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;;; if we were asked for a pdf...
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(when (string= (file-name-extension (cdr (assq :file params))) "pdf")
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(org-babel-eval (concat "ps2pdf" " " out-file " " (cdr (assq :file params))) ""))
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;;; indicate that the file has been written
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nil))
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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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(provide 'ob-abc)
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;;; ob-abc.el ends here
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