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+;;; ob-awk.el --- Babel Functions for Awk            -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2011-2017 Free Software Foundation, Inc.
+
+;; Author: Eric Schulte
+;; 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 <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Babel's awk can use special header argument:
+;;
+;; - :in-file takes a path to a file of data to be processed by awk
+;;
+;; - :stdin takes an Org data or code block reference, the value of
+;;          which will be passed to the awk process through STDIN
+
+;;; Code:
+(require 'ob)
+(require 'org-compat)
+
+(declare-function org-babel-ref-resolve "ob-ref" (ref))
+(declare-function orgtbl-to-generic "org-table" (table params))
+
+(defvar org-babel-tangle-lang-exts)
+(add-to-list 'org-babel-tangle-lang-exts '("awk" . "awk"))
+
+(defvar org-babel-awk-command "awk"
+  "Name of the awk executable command.")
+
+(defun org-babel-expand-body:awk (body _params)
+  "Expand BODY according to PARAMS, return the expanded body."
+  body)
+
+(defun org-babel-execute:awk (body params)
+  "Execute a block of Awk code with org-babel.  This function is
+called by `org-babel-execute-src-block'"
+  (message "executing Awk 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)))
+	 (full-body (org-babel-expand-body:awk body params))
+	 (code-file (let ((file (org-babel-temp-file "awk-")))
+                      (with-temp-file file (insert full-body)) file))
+	 (stdin (let ((stdin (cdr (assq :stdin params))))
+		   (when stdin
+		     (let ((tmp (org-babel-temp-file "awk-stdin-"))
+			   (res (org-babel-ref-resolve stdin)))
+		       (with-temp-file tmp
+			 (insert (org-babel-awk-var-to-awk res)))
+		       tmp))))
+         (cmd (mapconcat #'identity
+			 (append
+			  (list org-babel-awk-command
+				"-f" code-file cmd-line)
+			  (mapcar (lambda (pair)
+				    (format "-v %s='%s'"
+					    (car pair)
+					    (org-babel-awk-var-to-awk
+					     (cdr pair))))
+				  (org-babel--get-vars params))
+			  (list 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 "awk-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))))))
+
+(defun org-babel-awk-var-to-awk (var &optional sep)
+  "Return a printed value of VAR suitable for parsing with awk."
+  (let ((echo-var (lambda (v) (if (stringp v) v (format "%S" v)))))
+    (cond
+     ((and (listp var) (listp (car var)))
+      (orgtbl-to-generic var  (list :sep (or sep "\t") :fmt echo-var)))
+     ((listp var)
+      (mapconcat echo-var var "\n"))
+     (t (funcall echo-var var)))))
+
+(provide 'ob-awk)
+
+
+
+;;; ob-awk.el ends here