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+;;; ob-sed.el --- Babel Functions for Sed Scripts    -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2015-2021 Free Software Foundation, Inc.
+
+;; Author: Bjarte Johansen
+;; Keywords: literate programming, reproducible research
+
+;; 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 <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Provides a way to evaluate sed scripts in Org mode.
+
+;;; Usage:
+
+;; Add to your Emacs config:
+
+;; (org-babel-do-load-languages
+;;  'org-babel-load-languages
+;;  '((sed . t)))
+
+;; In addition to the normal header arguments, ob-sed also provides
+;; :cmd-line and :in-file. :cmd-line allows one to pass other flags to
+;; the sed command like the "--in-place" flag which makes sed edit the
+;; file pass to it instead of outputting to standard out or to a
+;; different file. :in-file is a header arguments that allows one to
+;; tell Org Babel which file the sed script to act on.
+
+;;; Code:
+(require 'ob)
+
+(defvar org-babel-sed-command "sed"
+  "Name of the sed executable command.")
+
+(defvar org-babel-tangle-lang-exts)
+(add-to-list 'org-babel-tangle-lang-exts '("sed" . "sed"))
+
+(defconst org-babel-header-args:sed
+  '((:cmd-line . :any)
+    (:in-file  . :any))
+  "Sed specific header arguments.")
+
+(defvar org-babel-default-header-args:sed '()
+  "Default arguments for evaluating a sed source block.")
+
+(defun org-babel-execute:sed (body params)
+  "Execute a block of sed code with Org Babel.
+BODY is the source inside a sed source block and PARAMS is an
+association list over the source block configurations.  This
+function is called by `org-babel-execute-src-block'."
+  (message "executing sed source code block")
+  (let* ((result-params (cdr (assq :result-params params)))
+         (cmd-line (cdr (assq :cmd-line params)))
+         (in-file (cdr (assq :in-file params)))
+	 (code-file (let ((file (org-babel-temp-file "sed-")))
+                      (with-temp-file file
+			(insert body))
+		      file))
+	 (stdin (let ((stdin (cdr (assq :stdin params))))
+		  (when stdin
+		    (let ((tmp (org-babel-temp-file "sed-stdin-"))
+			  (res (org-babel-ref-resolve stdin)))
+		      (with-temp-file tmp
+			(insert res))
+		      tmp))))
+         (cmd (mapconcat #'identity
+			 (remq nil
+			       (list org-babel-sed-command
+				     (format "-f \"%s\"" code-file)
+				     cmd-line
+				     in-file))
+			 " ")))
+    (org-babel-reassemble-table
+     (let ((results
+            (cond
+             (stdin (with-temp-buffer
+                      (call-process-shell-command cmd stdin (current-buffer))
+                      (buffer-string)))
+             (t (org-babel-eval cmd "")))))
+       (when results
+         (org-babel-result-cond result-params
+	   results
+	   (let ((tmp (org-babel-temp-file "sed-results-")))
+	     (with-temp-file tmp (insert results))
+	     (org-babel-import-elisp-from-file tmp)))))
+     (org-babel-pick-name
+      (cdr (assq :colname-names params)) (cdr (assq :colnames params)))
+     (org-babel-pick-name
+      (cdr (assq :rowname-names params)) (cdr (assq :rownames params))))))
+
+(provide 'ob-sed)
+
+;;; ob-sed.el ends here