all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob c109d893408d584f6d61fbbe7b9de2d439f1deba 9444 bytes (raw)
name: lisp/ob-ref.el 	 # note: path name is non-authoritative(*)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
 
;;; ob-ref.el --- Babel Functions for Referencing External Data -*- lexical-binding: t; -*-

;; Copyright (C) 2009-2016 Free Software Foundation, Inc.

;; Authors: Eric Schulte
;;	 Dan Davison
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org

;; 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 <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Functions for referencing data from the header arguments of a
;; org-babel block.  The syntax of such a reference should be

;;   #+VAR: variable-name=file:resource-id

;; - variable-name :: the name of the variable to which the value
;;                    will be assigned

;; - file :: path to the file containing the resource, or omitted if
;;           resource is in the current file

;; - resource-id :: the id or name of the resource

;; So an example of a simple src block referencing table data in the
;; same file would be

;;  #+NAME: sandbox
;;  | 1 |         2 | 3 |
;;  | 4 | org-babel | 6 |
;;
;;  #+begin_src emacs-lisp :var table=sandbox
;;    (message table)
;;  #+end_src

;;; Code:
(require 'ob-core)
(require 'cl-lib)

(declare-function org-babel-lob-get-info "ob-lob" (&optional datum))
(declare-function org-element-at-point "org-element" ())
(declare-function org-element-property "org-element" (property element))
(declare-function org-element-type "org-element" (element))
(declare-function org-end-of-meta-data "org" (&optional full))
(declare-function org-find-property "org" (property &optional value))
(declare-function org-id-find-id-file "org-id" (id))
(declare-function org-id-find-id-in-file "org-id" (id file &optional markerp))
(declare-function org-in-commented-heading-p "org" (&optional no-inheritance))
(declare-function org-narrow-to-subtree "org" ())
(declare-function org-show-context "org" (&optional key))
(declare-function org-trim "org" (s &optional keep-lead))

(defvar org-babel-ref-split-regexp
  "[ \f\t\n\r\v]*\\(.+?\\)[ \f\t\n\r\v]*=[ \f\t\n\r\v]*\\(.+\\)[ \f\t\n\r\v]*")

(defvar org-babel-update-intermediate nil
  "Update the in-buffer results of code blocks executed to resolve references.")

(defun org-babel-ref-parse (assignment)
  "Parse a variable ASSIGNMENT in a header argument.
If the right hand side of the assignment has a literal value
return that value, otherwise interpret as a reference to an
external resource and find its value using
`org-babel-ref-resolve'.  Return a list with two elements.  The
first element of the list will be the name of the variable, and
the second will be an emacs-lisp representation of the value of
the variable."
  (when (string-match org-babel-ref-split-regexp assignment)
    (let ((var (match-string 1 assignment))
	  (ref (match-string 2 assignment)))
      (cons (intern var)
	    (let ((out (save-excursion
			 (when org-babel-current-src-block-location
			   (goto-char (if (markerp org-babel-current-src-block-location)
					  (marker-position org-babel-current-src-block-location)
					org-babel-current-src-block-location)))
			 (org-babel-read ref))))
	      (if (equal out ref)
		  (if (and (string-prefix-p "\"" ref)
			   (string-suffix-p "\"" ref))
		      (read ref)
		    (org-babel-ref-resolve ref))
		out))))))

(defun org-babel-ref-goto-headline-id (id)
  (or (let ((h (org-find-property "CUSTOM_ID" id)))
	(when h (goto-char h)))
      (let* ((file (org-id-find-id-file id))
	     (m (when file (org-id-find-id-in-file id file 'marker))))
	(when (and file m)
	  (message "file:%S" file)
	  (pop-to-buffer-same-window (marker-buffer m))
	  (goto-char m)
	  (move-marker m nil)
	  (org-show-context)
	  t))))

(defun org-babel-ref-headline-body ()
  (save-restriction
    (org-narrow-to-subtree)
    (buffer-substring
     (save-excursion (goto-char (point-min))
		     (org-end-of-meta-data)
		     (point))
     (point-max))))

(defvar org-babel-library-of-babel)
(defun org-babel-ref-resolve (ref)
  "Resolve the reference REF and return its value."
  (save-window-excursion
    (with-current-buffer (or org-babel-exp-reference-buffer (current-buffer))
      (save-excursion
	(let ((case-fold-search t)
	      args new-refere new-header-args new-referent split-file split-ref
	      index)
	  ;; if ref is indexed grab the indices -- beware nested indices
	  (when (and (string-match "\\[\\([^\\[]+\\)\\]$" ref)
		     (let ((str (substring ref 0 (match-beginning 0))))
		       (= (cl-count ?( str) (cl-count ?) str))))
	    (setq index (match-string 1 ref))
	    (setq ref (substring ref 0 (match-beginning 0))))
	  ;; assign any arguments to pass to source block
	  (when (string-match
		 "^\\(.+?\\)\\(\\[\\(.*\\)\\]\\|\\(\\)\\)(\\(.*\\))$" ref)
	    (setq new-refere      (match-string 1 ref))
	    (setq new-header-args (match-string 3 ref))
	    (setq new-referent    (match-string 5 ref))
	    (when (> (length new-refere) 0)
	      (when (> (length new-referent) 0)
		(setq args (mapcar (lambda (ref) (cons :var ref))
				   (org-babel-ref-split-args new-referent))))
	      (when (> (length new-header-args) 0)
		(setq args (append (org-babel-parse-header-arguments
				    new-header-args) args)))
	      (setq ref new-refere)))
	  (when (string-match "^\\(.+\\):\\(.+\\)$" ref)
	    (setq split-file (match-string 1 ref))
	    (setq split-ref (match-string 2 ref))
	    (find-file split-file)
	    (setq ref split-ref))
	  (org-with-wide-buffer
	   (goto-char (point-min))
	   (let* ((params (append args '((:results . "silent"))))
		  (regexp (org-babel-named-data-regexp-for-name ref))
		  (result
		   (catch :found
		     ;; Check for code blocks or named data.
		     (while (re-search-forward regexp nil t)
		       ;; Ignore COMMENTed headings and orphaned
		       ;; affiliated keywords.
		       (unless (org-in-commented-heading-p)
			 (let ((e (org-element-at-point)))
			   (when (equal (org-element-property :name e) ref)
			     (goto-char
			      (org-element-property :post-affiliated e))
			     (pcase (org-element-type e)
			       (`babel-call
				(throw :found
				       (org-babel-execute-src-block
					nil (org-babel-lob-get-info e) params)))
			       (`src-block
				(throw :found
				       (org-babel-execute-src-block
					nil nil
					(and
					 (not org-babel-update-intermediate)
					 params))))
			       ((and (let v (org-babel-read-element e))
				     (guard v))
				(throw :found v))
			       (_ (error "Reference not found")))))))
		     ;; Check for local or global headlines by ID.
		     (when (org-babel-ref-goto-headline-id ref)
		       (throw :found (org-babel-ref-headline-body)))
		     ;; Check the Library of Babel.
		     (let ((info (cdr (assq (intern ref)
					    org-babel-library-of-babel))))
		       (when info
			 (throw :found
				(org-babel-execute-src-block nil info params))))
		     (error "Reference `%s' not found in this buffer" ref))))
	     (cond
	      ((symbolp result) (format "%S" result))
	      ((and index (listp result))
	       (org-babel-ref-index-list index result))
	      (t result)))))))))

(defun org-babel-ref-index-list (index lis)
  "Return the subset of LIS indexed by INDEX.

Indices are 0 based and negative indices count from the end of
LIS, so 0 references the first element of LIS and -1 references
the last.  If INDEX is separated by \",\"s then each \"portion\"
is assumed to index into the next deepest nesting or dimension.

A valid \"portion\" can consist of either an integer index, two
integers separated by a \":\" in which case the entire range is
returned, or an empty string or \"*\" both of which are
interpreted to mean the entire range and as such are equivalent
to \"0:-1\"."
  (if (and (> (length index) 0) (string-match "^\\([^,]*\\),?" index))
      (let* ((ind-re "\\(\\([-[:digit:]]+\\):\\([-[:digit:]]+\\)\\|\\*\\)")
	     (lgth (length lis))
	     (portion (match-string 1 index))
	     (remainder (substring index (match-end 0)))
	     (wrap (lambda (num) (if (< num 0) (+ lgth num) num)))
	     (open (lambda (ls) (if (and (listp ls) (= (length ls) 1)) (car ls) ls))))
	(funcall
	 open
	 (mapcar
	  (lambda (sub-lis)
	    (if (listp sub-lis)
		(org-babel-ref-index-list remainder sub-lis)
	      sub-lis))
	  (if (or (= 0 (length portion)) (string-match ind-re portion))
	      (mapcar
	       (lambda (n) (nth n lis))
	       (apply 'org-number-sequence
		      (if (and (> (length portion) 0) (match-string 2 portion))
			  (list
			   (funcall wrap (string-to-number (match-string 2 portion)))
			   (funcall wrap (string-to-number (match-string 3 portion))))
			(list (funcall wrap 0) (funcall wrap -1)))))
	    (list (nth (funcall wrap (string-to-number portion)) lis))))))
    lis))

(defun org-babel-ref-split-args (arg-string)
  "Split ARG-STRING into top-level arguments of balanced parenthesis."
  (mapcar #'org-trim (org-babel-balanced-split arg-string 44)))


(provide 'ob-ref)

;;; ob-ref.el ends here

debug log:

solving c109d89 ...
found c109d89 in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.