;;; ob-exp.el --- Exportation of Babel Source Blocks -*- lexical-binding: t; -*- ;; Copyright (C) 2009-2022 Free Software Foundation, Inc. ;; Authors: Eric Schulte ;; Dan Davison ;; Keywords: literate programming, reproducible research ;; URL: https://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 . ;;; Code: (require 'org-macs) (org-assert-version) (require 'ob-core) (declare-function org-babel-lob-get-info "ob-lob" (&optional datum)) (declare-function org-element-at-point "org-element" (&optional pom cached-only)) (declare-function org-element-context "org-element" (&optional element)) (declare-function org-element-property "org-element" (property element)) (declare-function org-element-type "org-element" (element)) (declare-function org-escape-code-in-string "org-src" (s)) (declare-function org-export-copy-buffer "ox" (&optional buffer drop-visibility drop-narrowing drop-contents drop-locals)) (declare-function org-in-commented-heading-p "org" (&optional no-inheritance element)) (declare-function org-in-archived-heading-p "org" (&optional no-inheritance element)) (defvar org-src-preserve-indentation) (defcustom org-export-use-babel t "Switch controlling code evaluation and header processing during export. When set to nil no code will be evaluated as part of the export process and no header arguments will be obeyed. Users who wish to avoid evaluating code on export should use the header argument `:eval never-export'." :group 'org-babel :version "24.1" :type '(choice (const :tag "Never" nil) (const :tag "Always" t)) :safe #'null) (defmacro org-babel-exp--at-source (&rest body) "Evaluate BODY at the source of the Babel block at point. Source is located in `org-babel-exp-reference-buffer'. The value returned is the value of the last form in BODY. Assume that point is at the beginning of the Babel block." (declare (indent 1) (debug body)) `(let ((source (get-text-property (point) 'org-reference))) ;; Source blocks created during export process (e.g., by other ;; source blocks) are not referenced. In this case, do not move ;; point at all. (with-current-buffer (if source org-babel-exp-reference-buffer (current-buffer)) (org-with-wide-buffer (when source (goto-char source)) ,@body)))) (defun org-babel-exp-src-block (&optional element) "Process source block for export. Depending on the \":export\" header argument, replace the source code block like this: both ---- display the code and the results code ---- the default, display the code inside the block but do not process results - just like none only the block is run on export ensuring that its results are present in the Org mode buffer none ---- do not display either code or results upon export Optional argument ELEMENT must contain source block element at point. Assume point is at block opening line." (interactive) (save-excursion (let* ((info (org-babel-get-src-block-info nil element)) (lang (nth 0 info)) (raw-params (nth 2 info)) hash) ;; bail if we couldn't get any info from the block (unless noninteractive (message "org-babel-exp process %s at position %d..." lang (line-beginning-position))) (when info ;; if we're actually going to need the parameters (when (member (cdr (assq :exports (nth 2 info))) '("both" "results")) (let ((lang-headers (intern (concat "org-babel-default-header-args:" lang)))) (org-babel-exp--at-source (setf (nth 2 info) (org-babel-process-params (apply #'org-babel-merge-params org-babel-default-header-args (and (boundp lang-headers) (symbol-value lang-headers)) (append (org-babel-params-from-properties lang) (list raw-params))))))) (setf hash (org-babel-sha1-hash info :export))) (org-babel-exp-do-export info 'block hash))))) (defcustom org-babel-exp-call-line-template "" "Template used to export call lines. This template may be customized to include the call line name with any export markup. The template is filled out using `org-fill-template', and the following %keys may be used. line --- call line An example value would be \"\\n: call: %line\" to export the call line wrapped in a verbatim environment. Note: the results are inserted separately after the contents of this template." :group 'org-babel :type 'string) (defun org-babel-exp-process-buffer () "Execute all Babel blocks in current buffer." (interactive) (when org-export-use-babel (save-window-excursion (let ((case-fold-search t) (regexp "\\(call\\|src\\)_\\|^[ \t]*#\\+\\(BEGIN_SRC\\|CALL:\\)") ;; Get a pristine copy of current buffer so Babel ;; references are properly resolved and source block ;; context is preserved. (org-babel-exp-reference-buffer (org-export-copy-buffer)) element) (unwind-protect (save-excursion ;; First attach to every source block their original ;; position, so that they can be retrieved within ;; `org-babel-exp-reference-buffer', even after heavy ;; modifications on current buffer. ;; ;; False positives are harmless, so we don't check if ;; we're really at some Babel object. Moreover, ;; `line-end-position' ensures that we propertize ;; a noticeable part of the object, without affecting ;; multiple objects on the same line. (goto-char (point-min)) (while (re-search-forward regexp nil t) (let ((s (match-beginning 0))) (put-text-property s (line-end-position) 'org-reference s))) ;; Evaluate from top to bottom every Babel block ;; encountered. (goto-char (point-min)) ;; We are about to do a large number of changes in ;; buffer, but we do not care about folding in this ;; buffer. (org-fold-core-ignore-modifications (while (re-search-forward regexp nil t) (setq element (org-element-at-point)) (unless (save-match-data (or (org-in-commented-heading-p nil element) (org-in-archived-heading-p nil element))) (let* ((object? (match-end 1)) (element (save-match-data (if object? (org-element-context element) ;; No deep inspection if we're ;; just looking for an element. element))) (type (pcase (org-element-type element) ;; Discard block elements if we're looking ;; for inline objects. False results ;; happen when, e.g., "call_" syntax is ;; located within affiliated keywords: ;; ;; #+name: call_src ;; #+begin_src ... ((and (or `babel-call `src-block) (guard object?)) nil) (type type))) (begin (copy-marker (org-element-property :begin element))) (end (copy-marker (save-excursion (goto-char (org-element-property :end element)) (skip-chars-backward " \r\t\n") (point))))) (pcase type (`inline-src-block (let* ((info (org-babel-get-src-block-info nil element)) (params (nth 2 info))) (setf (nth 1 info) (if (and (cdr (assq :noweb params)) (string= "yes" (cdr (assq :noweb params)))) (org-babel-expand-noweb-references info org-babel-exp-reference-buffer) (nth 1 info))) (goto-char begin) (let ((replacement (org-babel-exp-do-export info 'inline))) (if (equal replacement "") ;; Replacement code is empty: remove ;; inline source block, including extra ;; white space that might have been ;; created when inserting results. (delete-region begin (progn (goto-char end) (skip-chars-forward " \t") (point))) ;; Otherwise: remove inline source block ;; but preserve following white spaces. ;; Then insert value. (unless (string= replacement (buffer-substring begin end)) (delete-region begin end) (insert replacement)))))) ((or `babel-call `inline-babel-call) (org-babel-exp-do-export (or (org-babel-lob-get-info element) (user-error "Unknown Babel reference: %s" (org-element-property :call element))) 'lob) (let ((rep (org-fill-template org-babel-exp-call-line-template `(("line" . ,(org-element-property :value element)))))) ;; If replacement is empty, completely remove ;; the object/element, including any extra ;; white space that might have been created ;; when including results. (if (equal rep "") (delete-region begin (progn (goto-char end) (if (not (eq type 'babel-call)) (progn (skip-chars-forward " \t") (point)) (skip-chars-forward " \r\t\n") (line-beginning-position)))) ;; Otherwise, preserve trailing ;; spaces/newlines and then, insert ;; replacement string. (goto-char begin) (delete-region begin end) (insert rep)))) (`src-block (let ((match-start (copy-marker (match-beginning 0))) (ind (org-current-text-indentation))) ;; Take care of matched block: compute ;; replacement string. In particular, a nil ;; REPLACEMENT means the block is left as-is ;; while an empty string removes the block. (let ((replacement (progn (goto-char match-start) (org-babel-exp-src-block element)))) (cond ((not replacement) (goto-char end)) ((equal replacement "") (goto-char end) (skip-chars-forward " \r\t\n") (beginning-of-line) (delete-region begin (point))) (t (if (or org-src-preserve-indentation (org-element-property :preserve-indent element)) ;; Indent only code block ;; markers. (with-temp-buffer ;; Do not use tabs for block ;; indentation. (when (fboundp 'indent-tabs-mode) (indent-tabs-mode -1) ;; FIXME: Emacs 26 ;; compatibility. (setq-local indent-tabs-mode nil)) (insert replacement) (skip-chars-backward " \r\t\n") (indent-line-to ind) (goto-char 1) (indent-line-to ind) (setq replacement (buffer-string))) ;; Indent everything. (with-temp-buffer ;; Do not use tabs for block ;; indentation. (when (fboundp 'indent-tabs-mode) (indent-tabs-mode -1) ;; FIXME: Emacs 26 ;; compatibility. (setq-local indent-tabs-mode nil)) (insert replacement) (indent-rigidly 1 (point) ind) (setq replacement (buffer-string)))) (goto-char match-start) (let ((rend (save-excursion (goto-char end) (line-end-position)))) (if (string-equal replacement (buffer-substring match-start rend)) (goto-char rend) (delete-region match-start (save-excursion (goto-char end) (line-end-position))) (insert replacement)))))) (set-marker match-start nil)))) (set-marker begin nil) (set-marker end nil)))))) (kill-buffer org-babel-exp-reference-buffer) (remove-text-properties (point-min) (point-max) '(org-reference nil))))))) (defun org-babel-exp-do-export (info type &optional hash) "Return a string with the exported content of a code block. The function respects the value of the :exports header argument." (let ((silently (lambda () (let ((session (cdr (assq :session (nth 2 info))))) (unless (equal "none" session) (org-babel-exp-results info type 'silent))))) (clean (lambda () (if (eq type 'inline) (org-babel-remove-inline-result) (org-babel-remove-result info))))) (pcase (or (cdr (assq :exports (nth 2 info))) "code") ("none" (funcall silently) (funcall clean) "") ("code" (funcall silently) (funcall clean) (org-babel-exp-code info type)) ("results" (org-babel-exp-results info type nil hash) "") ("both" (org-babel-exp-results info type nil hash) (org-babel-exp-code info type))))) (defcustom org-babel-exp-code-template "#+begin_src %lang%switches%flags\n%body\n#+end_src" "Template used to export the body of code blocks. This template may be customized to include additional information such as the code block name, or the values of particular header arguments. The template is filled out using `org-fill-template', and the following %keys may be used. lang ------ the language of the code block name ------ the name of the code block body ------ the body of the code block switches -- the switches associated to the code block flags ----- the flags passed to the code block In addition to the keys mentioned above, every header argument defined for the code block may be used as a key and will be replaced with its value." :group 'org-babel :type 'string) (defcustom org-babel-exp-inline-code-template "src_%lang[%switches%flags]{%body}" "Template used to export the body of inline code blocks. This template may be customized to include additional information such as the code block name, or the values of particular header arguments. The template is filled out using `org-fill-template', and the following %keys may be used. lang ------ the language of the code block name ------ the name of the code block body ------ the body of the code block switches -- the switches associated to the code block flags ----- the flags passed to the code block In addition to the keys mentioned above, every header argument defined for the code block may be used as a key and will be replaced with its value." :group 'org-babel :type 'string :version "26.1" :package-version '(Org . "8.3")) (defun org-babel-exp-code (info type) "Return the original code block formatted for export." (setf (nth 1 info) (if (string= "strip-export" (cdr (assq :noweb (nth 2 info)))) (replace-regexp-in-string (org-babel-noweb-wrap) "" (nth 1 info)) (if (org-babel-noweb-p (nth 2 info) :export) (org-babel-expand-noweb-references info org-babel-exp-reference-buffer) (nth 1 info)))) (org-fill-template (if (eq type 'inline) org-babel-exp-inline-code-template org-babel-exp-code-template) `(("lang" . ,(nth 0 info)) ;; Inline source code should not be escaped. ("body" . ,(let ((body (nth 1 info))) (if (eq type 'inline) body (org-escape-code-in-string body)))) ("switches" . ,(let ((f (nth 3 info))) (and (org-string-nw-p f) (concat " " f)))) ("flags" . ,(let ((f (assq :flags (nth 2 info)))) (and f (concat " " (cdr f))))) ,@(mapcar (lambda (pair) (cons (substring (symbol-name (car pair)) 1) (format "%S" (cdr pair)))) (nth 2 info)) ("name" . ,(or (nth 4 info) ""))))) (defun org-babel-exp-results (info type &optional silent hash) "Evaluate and return the results of the current code block for export. Results are prepared in a manner suitable for export by Org mode. This function is called by `org-babel-exp-do-export'. The code block will be evaluated. Optional argument SILENT can be used to inhibit insertion of results into the buffer." (unless (and hash (equal hash (org-babel-current-result-hash))) (let ((lang (nth 0 info)) (body (if (org-babel-noweb-p (nth 2 info) :eval) (org-babel-expand-noweb-references info org-babel-exp-reference-buffer) (nth 1 info))) (info (copy-sequence info)) (org-babel-current-src-block-location (point-marker))) ;; Skip code blocks which we can't evaluate. (when (fboundp (intern (concat "org-babel-execute:" lang))) (org-babel-eval-wipe-error-buffer) (setf (nth 1 info) body) (setf (nth 2 info) (org-babel-exp--at-source (org-babel-process-params (org-babel-merge-params (nth 2 info) `((:results . ,(if silent "silent" "replace"))))))) (pcase type (`block (org-babel-execute-src-block nil info)) (`inline ;; Position the point on the inline source block ;; allowing `org-babel-insert-result' to check that the ;; block is inline. (goto-char (nth 5 info)) (org-babel-execute-src-block nil info)) (`lob (save-excursion (goto-char (nth 5 info)) (org-babel-execute-src-block nil info)))))))) (provide 'ob-exp) ;;; ob-exp.el ends here