282 lines
11 KiB
EmacsLisp
282 lines
11 KiB
EmacsLisp
;;; ob-ref.el --- org-babel functions for referencing external data
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;; Copyright (C) 2009-2016 Free Software Foundation, Inc.
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;; Authors: Eric Schulte
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;; 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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;; #+NAME: 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-core)
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(eval-when-compile
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(require 'cl))
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(declare-function org-end-of-meta-data "org" (&optional full))
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(declare-function org-find-property "org" (property &optional value))
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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-id-find-id-file "org-id" (id))
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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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(declare-function org-babel-lob-execute "ob-lob" (info))
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(declare-function org-babel-lob-get-info "ob-lob" nil)
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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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(defvar org-babel-update-intermediate nil
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"Update the in-buffer results of code blocks executed to resolve references.")
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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 its 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 (save-excursion
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(when org-babel-current-src-block-location
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(goto-char (if (markerp org-babel-current-src-block-location)
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(marker-position org-babel-current-src-block-location)
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org-babel-current-src-block-location)))
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(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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(or (let ((h (org-find-property "CUSTOM_ID" id)))
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(when h (goto-char h)))
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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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(org-end-of-meta-data)
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(point))
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(point-max))))
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(defvar org-babel-lob-one-liner-regexp)
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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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(with-current-buffer (or org-babel-exp-reference-buffer (current-buffer))
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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 ((src-rx (org-babel-named-src-block-regexp-for-name ref))
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(res-rx (org-babel-named-data-regexp-for-name ref)))
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;; goto ref in the current buffer
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(or
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;; check for code blocks
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(re-search-forward src-rx nil t)
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;; check for named data
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(re-search-forward res-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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((and (looking-at org-babel-src-name-regexp)
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(save-excursion
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(forward-line 1)
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(or (looking-at org-babel-src-block-regexp)
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(looking-at org-babel-multi-line-header-regexp))))
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(setq type 'source-block))
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((and (looking-at org-babel-src-name-regexp)
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(save-excursion
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(forward-line 1)
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(looking-at org-babel-lob-one-liner-regexp)))
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(setq type 'call-line))
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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
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nil nil (if org-babel-update-intermediate
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nil params)))
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(call-line (save-excursion
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(forward-line 1)
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(org-babel-lob-execute
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(org-babel-lob-get-info))))
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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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(lgth (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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(wrap (lambda (num) (if (< num 0) (+ lgth num) num)))
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(open (lambda (ls) (if (and (listp ls) (= (length ls) 1)) (car ls) ls))))
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(funcall
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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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(funcall wrap (string-to-number (match-string 2 portion)))
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(funcall wrap (string-to-number (match-string 3 portion))))
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(list (funcall wrap 0) (funcall wrap -1)))))
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(list (nth (funcall 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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(mapcar #'org-babel-trim (org-babel-balanced-split arg-string 44)))
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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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