;;; ob-exp.el --- Exportation of Babel Source Blocks -*- lexical-binding: t; -*-
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;; Copyright (C) 2009-2018 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: https://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 <https://www.gnu.org/licenses/>.
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;;; Code:
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(require 'ob-core)
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(declare-function org-babel-lob-get-info "ob-lob" (&optional datum))
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(declare-function org-element-at-point "org-element" ())
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(declare-function org-element-context "org-element" (&optional element))
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(declare-function org-element-property "org-element" (property element))
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(declare-function org-element-type "org-element" (element))
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(declare-function org-escape-code-in-string "org-src" (s))
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(declare-function org-export-copy-buffer "ox" ())
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(declare-function org-fill-template "org" (template alist))
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(declare-function org-get-indentation "org" (&optional line))
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(declare-function org-in-commented-heading-p "org" (&optional no-inheritance))
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(defvar org-src-preserve-indentation)
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(defcustom org-export-use-babel t
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"Switch controlling code evaluation and header processing during export.
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When set to nil no code will be evaluated as part of the export
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process and no header arguments will be obeyed. Users who wish
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to avoid evaluating code on export should use the header argument
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`:eval never-export'."
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:group 'org-babel
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:version "24.1"
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:type '(choice (const :tag "Never" nil)
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(const :tag "Always" t))
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:safe #'null)
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(defmacro org-babel-exp--at-source (&rest body)
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"Evaluate BODY at the source of the Babel block at point.
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Source is located in `org-babel-exp-reference-buffer'. The value
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returned is the value of the last form in BODY. Assume that
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point is at the beginning of the Babel block."
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(declare (indent 1) (debug body))
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`(let ((source (get-text-property (point) 'org-reference)))
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;; Source blocks created during export process (e.g., by other
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;; source blocks) are not referenced. In this case, do not move
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;; point at all.
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(with-current-buffer (if source org-babel-exp-reference-buffer
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(current-buffer))
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(org-with-wide-buffer
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(when source (goto-char source))
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,@body))))
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(defun org-babel-exp-src-block ()
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"Process source block for export.
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Depending on the \":export\" header argument, replace the source
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code block like this:
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both ---- display the code and the results
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code ---- the default, display the code inside the block but do
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not process
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results - just like none only the block is run on export ensuring
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that its results are present in the Org mode buffer
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none ---- do not display either code or results upon export
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Assume point is at block opening line."
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(interactive)
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(save-excursion
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(let* ((info (org-babel-get-src-block-info 'light))
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(lang (nth 0 info))
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(raw-params (nth 2 info))
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hash)
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;; bail if we couldn't get any info from the block
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(unless noninteractive
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(message "org-babel-exp process %s at position %d..."
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lang
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(line-beginning-position)))
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(when info
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;; if we're actually going to need the parameters
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(when (member (cdr (assq :exports (nth 2 info))) '("both" "results"))
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(let ((lang-headers (intern (concat "org-babel-default-header-args:"
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lang))))
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(org-babel-exp--at-source
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(setf (nth 2 info)
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(org-babel-process-params
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(apply #'org-babel-merge-params
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org-babel-default-header-args
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(and (boundp lang-headers)
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(symbol-value lang-headers))
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(append (org-babel-params-from-properties lang)
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(list raw-params)))))))
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(setf hash (org-babel-sha1-hash info)))
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(org-babel-exp-do-export info 'block hash)))))
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(defcustom org-babel-exp-call-line-template
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""
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"Template used to export call lines.
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This template may be customized to include the call line name
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with any export markup. The template is filled out using
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`org-fill-template', and the following %keys may be used.
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line --- call line
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An example value would be \"\\n: call: %line\" to export the call line
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wrapped in a verbatim environment.
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Note: the results are inserted separately after the contents of
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this template."
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:group 'org-babel
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:type 'string)
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(defun org-babel-exp-process-buffer ()
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"Execute all Babel blocks in current buffer."
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(interactive)
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(when org-export-use-babel
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(save-window-excursion
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(let ((case-fold-search t)
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(regexp "\\(call\\|src\\)_\\|^[ \t]*#\\+\\(BEGIN_SRC\\|CALL:\\)")
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;; Get a pristine copy of current buffer so Babel
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;; references are properly resolved and source block
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;; context is preserved.
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(org-babel-exp-reference-buffer (org-export-copy-buffer)))
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(unwind-protect
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(save-excursion
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;; First attach to every source block their original
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;; position, so that they can be retrieved within
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;; `org-babel-exp-reference-buffer', even after heavy
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;; modifications on current buffer.
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;;
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;; False positives are harmless, so we don't check if
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;; we're really at some Babel object. Moreover,
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;; `line-end-position' ensures that we propertize
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;; a noticeable part of the object, without affecting
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;; multiple objects on the same line.
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(goto-char (point-min))
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(while (re-search-forward regexp nil t)
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(let ((s (match-beginning 0)))
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(put-text-property s (line-end-position) 'org-reference s)))
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;; Evaluate from top to bottom every Babel block
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;; encountered.
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(goto-char (point-min))
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(while (re-search-forward regexp nil t)
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(unless (save-match-data (org-in-commented-heading-p))
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(let* ((object? (match-end 1))
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(element (save-match-data
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(if object? (org-element-context)
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;; No deep inspection if we're
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;; just looking for an element.
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(org-element-at-point))))
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(type
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(pcase (org-element-type element)
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;; Discard block elements if we're looking
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;; for inline objects. False results
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;; happen when, e.g., "call_" syntax is
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;; located within affiliated keywords:
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;;
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;; #+name: call_src
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;; #+begin_src ...
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((and (or `babel-call `src-block) (guard object?))
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nil)
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(type type)))
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(begin
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(copy-marker (org-element-property :begin element)))
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(end
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(copy-marker
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(save-excursion
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(goto-char (org-element-property :end element))
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(skip-chars-backward " \r\t\n")
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(point)))))
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(pcase type
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(`inline-src-block
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(let* ((info
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(org-babel-get-src-block-info nil element))
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(params (nth 2 info)))
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(setf (nth 1 info)
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(if (and (cdr (assq :noweb params))
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(string= "yes"
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(cdr (assq :noweb params))))
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(org-babel-expand-noweb-references
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info org-babel-exp-reference-buffer)
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(nth 1 info)))
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(goto-char begin)
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(let ((replacement
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(org-babel-exp-do-export info 'inline)))
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(if (equal replacement "")
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;; Replacement code is empty: remove
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;; inline source block, including extra
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;; white space that might have been
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;; created when inserting results.
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(delete-region begin
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(progn (goto-char end)
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(skip-chars-forward " \t")
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(point)))
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;; Otherwise: remove inline src block but
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;; preserve following white spaces. Then
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;; insert value.
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(delete-region begin end)
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(insert replacement)))))
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((or `babel-call `inline-babel-call)
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(org-babel-exp-do-export (org-babel-lob-get-info element)
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'lob)
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(let ((rep
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(org-fill-template
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org-babel-exp-call-line-template
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`(("line" .
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,(org-element-property :value element))))))
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;; If replacement is empty, completely remove
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;; the object/element, including any extra
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;; white space that might have been created
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;; when including results.
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(if (equal rep "")
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(delete-region
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begin
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(progn (goto-char end)
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(if (not (eq type 'babel-call))
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(progn (skip-chars-forward " \t")
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(point))
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(skip-chars-forward " \r\t\n")
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(line-beginning-position))))
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;; Otherwise, preserve trailing
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;; spaces/newlines and then, insert
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;; replacement string.
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(goto-char begin)
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(delete-region begin end)
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(insert rep))))
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(`src-block
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(let ((match-start (copy-marker (match-beginning 0)))
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(ind (org-get-indentation)))
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;; Take care of matched block: compute
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;; replacement string. In particular, a nil
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;; REPLACEMENT means the block is left as-is
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;; while an empty string removes the block.
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(let ((replacement
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(progn (goto-char match-start)
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(org-babel-exp-src-block))))
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(cond ((not replacement) (goto-char end))
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((equal replacement "")
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(goto-char end)
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(skip-chars-forward " \r\t\n")
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(beginning-of-line)
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(delete-region begin (point)))
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(t
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(goto-char match-start)
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(delete-region (point)
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(save-excursion
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(goto-char end)
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(line-end-position)))
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(insert replacement)
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(if (or org-src-preserve-indentation
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(org-element-property
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:preserve-indent element))
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;; Indent only code block
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;; markers.
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(save-excursion
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(skip-chars-backward " \r\t\n")
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(indent-line-to ind)
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(goto-char match-start)
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(indent-line-to ind))
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;; Indent everything.
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(indent-rigidly
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match-start (point) ind)))))
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(set-marker match-start nil))))
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(set-marker begin nil)
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(set-marker end nil)))))
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(kill-buffer org-babel-exp-reference-buffer)
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(remove-text-properties (point-min) (point-max) '(org-reference)))))))
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(defun org-babel-exp-do-export (info type &optional hash)
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"Return a string with the exported content of a code block.
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The function respects the value of the :exports header argument."
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(let ((silently (lambda () (let ((session (cdr (assq :session (nth 2 info)))))
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(unless (equal "none" session)
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(org-babel-exp-results info type 'silent)))))
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(clean (lambda () (if (eq type 'inline)
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(org-babel-remove-inline-result)
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(org-babel-remove-result info)))))
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(pcase (or (cdr (assq :exports (nth 2 info))) "code")
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("none" (funcall silently) (funcall clean) "")
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("code" (funcall silently) (funcall clean) (org-babel-exp-code info type))
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("results" (org-babel-exp-results info type nil hash) "")
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("both"
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(org-babel-exp-results info type nil hash)
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(org-babel-exp-code info type)))))
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(defcustom org-babel-exp-code-template
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"#+BEGIN_SRC %lang%switches%flags\n%body\n#+END_SRC"
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"Template used to export the body of code blocks.
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This template may be customized to include additional information
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such as the code block name, or the values of particular header
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arguments. The template is filled out using `org-fill-template',
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and the following %keys may be used.
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lang ------ the language of the code block
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name ------ the name of the code block
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body ------ the body of the code block
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switches -- the switches associated to the code block
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flags ----- the flags passed to the code block
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In addition to the keys mentioned above, every header argument
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defined for the code block may be used as a key and will be
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replaced with its value."
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:group 'org-babel
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:type 'string)
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(defcustom org-babel-exp-inline-code-template
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"src_%lang[%switches%flags]{%body}"
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"Template used to export the body of inline code blocks.
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This template may be customized to include additional information
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such as the code block name, or the values of particular header
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arguments. The template is filled out using `org-fill-template',
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and the following %keys may be used.
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lang ------ the language of the code block
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name ------ the name of the code block
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body ------ the body of the code block
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switches -- the switches associated to the code block
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flags ----- the flags passed to the code block
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In addition to the keys mentioned above, every header argument
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defined for the code block may be used as a key and will be
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replaced with its value."
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:group 'org-babel
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:type 'string
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:version "26.1"
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:package-version '(Org . "8.3"))
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(defun org-babel-exp-code (info type)
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"Return the original code block formatted for export."
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(setf (nth 1 info)
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(if (string= "strip-export" (cdr (assq :noweb (nth 2 info))))
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(replace-regexp-in-string
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(org-babel-noweb-wrap) "" (nth 1 info))
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(if (org-babel-noweb-p (nth 2 info) :export)
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(org-babel-expand-noweb-references
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info org-babel-exp-reference-buffer)
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(nth 1 info))))
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(org-fill-template
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(if (eq type 'inline)
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org-babel-exp-inline-code-template
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org-babel-exp-code-template)
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`(("lang" . ,(nth 0 info))
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("body" . ,(org-escape-code-in-string (nth 1 info)))
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("switches" . ,(let ((f (nth 3 info)))
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(and (org-string-nw-p f) (concat " " f))))
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("flags" . ,(let ((f (assq :flags (nth 2 info))))
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(and f (concat " " (cdr f)))))
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,@(mapcar (lambda (pair)
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(cons (substring (symbol-name (car pair)) 1)
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(format "%S" (cdr pair))))
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(nth 2 info))
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("name" . ,(or (nth 4 info) "")))))
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(defun org-babel-exp-results (info type &optional silent hash)
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"Evaluate and return the results of the current code block for export.
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Results are prepared in a manner suitable for export by Org mode.
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This function is called by `org-babel-exp-do-export'. The code
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block will be evaluated. Optional argument SILENT can be used to
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inhibit insertion of results into the buffer."
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(unless (and hash (equal hash (org-babel-current-result-hash)))
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(let ((lang (nth 0 info))
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(body (if (org-babel-noweb-p (nth 2 info) :eval)
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(org-babel-expand-noweb-references
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info org-babel-exp-reference-buffer)
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(nth 1 info)))
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(info (copy-sequence info))
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(org-babel-current-src-block-location (point-marker)))
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;; Skip code blocks which we can't evaluate.
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(when (fboundp (intern (concat "org-babel-execute:" lang)))
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(org-babel-eval-wipe-error-buffer)
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(setf (nth 1 info) body)
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(setf (nth 2 info)
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(org-babel-exp--at-source
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(org-babel-process-params
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(org-babel-merge-params
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(nth 2 info)
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`((:results . ,(if silent "silent" "replace")))))))
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(pcase type
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(`block (org-babel-execute-src-block nil info))
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(`inline
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;; Position the point on the inline source block
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;; allowing `org-babel-insert-result' to check that the
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;; block is inline.
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(goto-char (nth 5 info))
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(org-babel-execute-src-block nil info))
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(`lob
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(save-excursion
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(goto-char (nth 5 info))
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(let (org-confirm-babel-evaluate)
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(org-babel-execute-src-block nil info)))))))))
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(provide 'ob-exp)
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;;; ob-exp.el ends here
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