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84 lines
2.9 KiB
EmacsLisp
84 lines
2.9 KiB
EmacsLisp
;;; litorgy-reference.el --- litorgical functions for referencing external data
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;; Copyright (C) 2009 Eric Schulte, Dan Davison, Austin F. Frank
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;; Author: Eric Schulte, Dan Davison, Austin F. Frank
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;; Keywords: literate programming, reproducible research
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;; Homepage: http://orgmode.org
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;; Version: 0.01
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;;; License:
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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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;;; Commentary:
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;; Functions for referencing data from the header arguments of a
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;; litorgical block. The syntax of such a reference should be
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;;
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;; #+VAR: variable-name=file:resource-id
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;;
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;; - variable-name :: the name of the variable to which the value
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;; will be assigned
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;;
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;; - file :: path to the file containing the resource, or omitted if
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;; resource is in the current file
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;;
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;; - resource-id :: the id or name of the resource, or 'previous' to
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;; grab the previous table, or 'next' to grab the
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;; next table
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;;
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;; So an example of a simple src block referencing table data in the
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;; same file would be
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;;
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;; #+var: table previous
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;; #+begin_src emacs-lisp
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;; (message table)
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;; #+end_src
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;;
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;;; Code:
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(require 'litorgy)
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(defun litorgy-reference-variables (params)
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"Takes a parameter alist, and return an alist of variable
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names, and the string representation of the related value."
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(mapcar #'litorgy-reference-parse
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(delq nil (mapcar (lambda (pair) (if (= (car pair) :var) (cdr pair))) params))))
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(defun litorgy-reference-parse (reference)
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"Parse a reference to an external resource returning a list
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with two elements. The first element of the list will be the
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name of the variable, and the second will be an emacs-lisp
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representation of the value of the variable."
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(save-excursion
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(if (string-match "(.+)=(.+)" reference)
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(let ((var (match-string 1 reference))
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(ref (match-string 2 reference)))
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(when (string-match "(.+):(.+)" reference)
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(find-file (match-string 1 reference))
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(setf ref (match-string 2 reference)))
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;; follow the reference in the current file
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(case ref
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("previous"
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)
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("next")
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(t ))
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))))
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(provide 'litorgy-reference)
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;;; litorgy-reference.el ends here
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