forked from mirrors/org-mode
58f1dbccf8
Also remove blank lines before the ";;; org*el ends here" declarations. Having a "Version" header forced us to update every file when releasing a new version of Org; it also forced us to update every file when merging Org with Emacs trunk, thus cluttering the diffs between the previously merged version and the new one with useless information. Glenn Morris suggested this in emacs-devel: http://lists.gnu.org/archive/html/emacs-devel/2011-08/msg00322.html
268 lines
10 KiB
EmacsLisp
268 lines
10 KiB
EmacsLisp
;;; ob-ref.el --- org-babel functions for referencing external data
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;; Copyright (C) 2009-2011 Free Software Foundation, Inc.
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;; Author: Eric Schulte, Dan Davison
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;; Keywords: literate programming, reproducible research
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;; Homepage: http://orgmode.org
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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 <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Functions for referencing data from the header arguments of a
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;; org-babel block. The syntax of such a reference should be
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;; #+VAR: variable-name=file:resource-id
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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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;; - 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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;; - resource-id :: the id or name of the resource
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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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;; #+TBLNAME: sandbox
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;; | 1 | 2 | 3 |
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;; | 4 | org-babel | 6 |
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;;
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;; #+begin_src emacs-lisp :var table=sandbox
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;; (message table)
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;; #+end_src
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;;; Code:
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(require 'ob)
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(eval-when-compile
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(require 'cl))
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(declare-function org-remove-if-not "org" (predicate seq))
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(declare-function org-at-table-p "org" (&optional table-type))
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(declare-function org-count "org" (CL-ITEM CL-SEQ))
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(declare-function org-at-item-p "org-list" ())
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(declare-function org-narrow-to-subtree "org" ())
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(declare-function org-id-find-id-in-file "org-id" (id file &optional markerp))
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(declare-function org-show-context "org" (&optional key))
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(declare-function org-pop-to-buffer-same-window
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"org-compat" (&optional buffer-or-name norecord label))
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(defvar org-babel-ref-split-regexp
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"[ \f\t\n\r\v]*\\(.+?\\)[ \f\t\n\r\v]*=[ \f\t\n\r\v]*\\(.+\\)[ \f\t\n\r\v]*")
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(defun org-babel-ref-parse (assignment)
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"Parse a variable ASSIGNMENT in a header argument.
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If the right hand side of the assignment has a literal value
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return that value, otherwise interpret as a reference to an
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external resource and find it's value using
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`org-babel-ref-resolve'. Return a list with two elements. The
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first element of the list will be the name of the variable, and
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the second will be an emacs-lisp representation of the value of
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the variable."
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(when (string-match org-babel-ref-split-regexp assignment)
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(let ((var (match-string 1 assignment))
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(ref (match-string 2 assignment)))
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(cons (intern var)
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(let ((out (org-babel-read ref)))
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(if (equal out ref)
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(if (string-match "^\".*\"$" ref)
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(read ref)
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(org-babel-ref-resolve ref))
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out))))))
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(defun org-babel-ref-goto-headline-id (id)
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(goto-char (point-min))
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(let ((rx (regexp-quote id)))
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(or (re-search-forward
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(concat "^[ \t]*:CUSTOM_ID:[ \t]+" rx "[ \t]*$") nil t)
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(let* ((file (org-id-find-id-file id))
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(m (when file (org-id-find-id-in-file id file 'marker))))
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(when (and file m)
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(message "file:%S" file)
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(org-pop-to-buffer-same-window (marker-buffer m))
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(goto-char m)
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(move-marker m nil)
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(org-show-context)
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t)))))
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(defun org-babel-ref-headline-body ()
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(save-restriction
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(org-narrow-to-subtree)
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(buffer-substring
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(save-excursion (goto-char (point-min))
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(forward-line 1)
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(when (looking-at "[ \t]*:PROPERTIES:")
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(re-search-forward ":END:" nil)
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(forward-char))
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(point))
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(point-max))))
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(defvar org-babel-library-of-babel)
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(defun org-babel-ref-resolve (ref)
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"Resolve the reference REF and return its value."
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(save-window-excursion
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(save-excursion
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(let ((case-fold-search t)
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type args new-refere new-header-args new-referent result
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lob-info split-file split-ref index index-row index-col id)
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;; if ref is indexed grab the indices -- beware nested indices
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(when (and (string-match "\\[\\([^\\[]+\\)\\]$" ref)
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(let ((str (substring ref 0 (match-beginning 0))))
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(= (org-count ?( str) (org-count ?) str))))
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(setq index (match-string 1 ref))
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(setq ref (substring ref 0 (match-beginning 0))))
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;; assign any arguments to pass to source block
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(when (string-match
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"^\\(.+?\\)\\(\\[\\(.*\\)\\]\\|\\(\\)\\)\(\\(.*\\)\)$" ref)
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(setq new-refere (match-string 1 ref))
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(setq new-header-args (match-string 3 ref))
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(setq new-referent (match-string 5 ref))
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(when (> (length new-refere) 0)
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(when (> (length new-referent) 0)
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(setq args (mapcar (lambda (ref) (cons :var ref))
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(org-babel-ref-split-args new-referent))))
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(when (> (length new-header-args) 0)
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(setq args (append (org-babel-parse-header-arguments
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new-header-args) args)))
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(setq ref new-refere)))
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(when (string-match "^\\(.+\\):\\(.+\\)$" ref)
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(setq split-file (match-string 1 ref))
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(setq split-ref (match-string 2 ref))
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(find-file split-file) (setq ref split-ref))
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(save-restriction
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(widen)
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(goto-char (point-min))
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(if (let* ((rx (regexp-quote ref))
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(res-rx (concat org-babel-result-regexp rx "[ \t]*$"))
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(src-rx (concat org-babel-src-name-regexp
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rx "\\(\(.*\)\\)?" "[ \t]*$")))
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;; goto ref in the current buffer
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(or (and (not args)
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(or (re-search-forward res-rx nil t)
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(re-search-backward res-rx nil t)))
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(re-search-forward src-rx nil t)
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(re-search-backward src-rx nil t)
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;; check for local or global headlines by id
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(setq id (org-babel-ref-goto-headline-id ref))
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;; check the Library of Babel
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(setq lob-info (cdr (assoc (intern ref)
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org-babel-library-of-babel)))))
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(unless (or lob-info id) (goto-char (match-beginning 0)))
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;; ;; TODO: allow searching for names in other buffers
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;; (setq id-loc (org-id-find ref 'marker)
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;; buffer (marker-buffer id-loc)
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;; loc (marker-position id-loc))
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;; (move-marker id-loc nil)
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(error "reference '%s' not found in this buffer" ref))
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(cond
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(lob-info (setq type 'lob))
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(id (setq type 'id))
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(t (while (not (setq type (org-babel-ref-at-ref-p)))
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(forward-line 1)
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(beginning-of-line)
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(if (or (= (point) (point-min)) (= (point) (point-max)))
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(error "reference not found")))))
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(let ((params (append args '((:results . "silent")))))
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(setq result
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(case type
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(results-line (org-babel-read-result))
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(table (org-babel-read-table))
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(list (org-babel-read-list))
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(file (org-babel-read-link))
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(source-block (org-babel-execute-src-block nil nil params))
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(lob (org-babel-execute-src-block
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nil lob-info params))
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(id (org-babel-ref-headline-body)))))
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(if (symbolp result)
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(format "%S" result)
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(if (and index (listp result))
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(org-babel-ref-index-list index result)
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result)))))))
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(defun org-babel-ref-index-list (index lis)
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"Return the subset of LIS indexed by INDEX.
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Indices are 0 based and negative indices count from the end of
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LIS, so 0 references the first element of LIS and -1 references
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the last. If INDEX is separated by \",\"s then each \"portion\"
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is assumed to index into the next deepest nesting or dimension.
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A valid \"portion\" can consist of either an integer index, two
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integers separated by a \":\" in which case the entire range is
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returned, or an empty string or \"*\" both of which are
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interpreted to mean the entire range and as such are equivalent
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to \"0:-1\"."
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(if (and (> (length index) 0) (string-match "^\\([^,]*\\),?" index))
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(let ((ind-re "\\(\\([-[:digit:]]+\\):\\([-[:digit:]]+\\)\\|\*\\)")
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(length (length lis))
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(portion (match-string 1 index))
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(remainder (substring index (match-end 0))))
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(flet ((wrap (num) (if (< num 0) (+ length num) num))
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(open (ls) (if (and (listp ls) (= (length ls) 1)) (car ls) ls)))
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(open
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(mapcar
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(lambda (sub-lis)
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(if (listp sub-lis)
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(org-babel-ref-index-list remainder sub-lis)
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sub-lis))
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(if (or (= 0 (length portion)) (string-match ind-re portion))
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(mapcar
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(lambda (n) (nth n lis))
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(apply 'org-number-sequence
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(if (and (> (length portion) 0) (match-string 2 portion))
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(list
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(wrap (string-to-number (match-string 2 portion)))
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(wrap (string-to-number (match-string 3 portion))))
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(list (wrap 0) (wrap -1)))))
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(list (nth (wrap (string-to-number portion)) lis)))))))
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lis))
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(defun org-babel-ref-split-args (arg-string)
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"Split ARG-STRING into top-level arguments of balanced parenthesis."
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(let ((index 0) (depth 0) (buffer "") holder return)
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;; crawl along string, splitting at any ","s which are on the top level
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(while (< index (length arg-string))
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(setq holder (substring arg-string index (+ 1 index)))
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(setq buffer (concat buffer holder))
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(setq index (+ 1 index))
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(cond
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((string= holder ",")
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(when (= depth 0)
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(setq return (cons (substring buffer 0 -1) return))
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(setq buffer "")))
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((or (string= holder "(") (string= holder "[")) (setq depth (+ depth 1)))
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((or (string= holder ")") (string= holder "]")) (setq depth (- depth 1)))))
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(mapcar #'org-babel-trim (reverse (cons buffer return)))))
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(defvar org-bracket-link-regexp)
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(defun org-babel-ref-at-ref-p ()
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"Return the type of reference located at point.
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Return nil if none of the supported reference types are found.
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Supported reference types are tables and source blocks."
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(cond ((org-at-table-p) 'table)
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((org-at-item-p) 'list)
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((looking-at "^[ \t]*#\\+BEGIN_SRC") 'source-block)
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((looking-at org-bracket-link-regexp) 'file)
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((looking-at org-babel-result-regexp) 'results-line)))
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(provide 'ob-ref)
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;;; ob-ref.el ends here
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