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+;;; ob-eshell.el --- Babel Functions for Eshell      -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2018-2021 Free Software Foundation, Inc.
+
+;; Author: stardiviner <numbchild@gmail.com>
+;; Maintainer: stardiviner <numbchild@gmail.com>
+;; Homepage: https://github.com/stardiviner/ob-eshell
+;; 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:
+
+;; Org Babel support for evaluating Eshell source code.
+
+;;; Code:
+(require 'ob)
+(require 'eshell)
+
+(declare-function eshell-send-input "esh-mode"
+                  (&optional use-region queue-p no-newline))
+
+(defvar eshell-last-output-start)
+(defvar eshell-last-output-end)
+(defvar eshell-last-input-end)
+
+(defvar org-babel-default-header-args:eshell '())
+
+(defun org-babel-execute:eshell (body params)
+  "Execute a block of Eshell code BODY with PARAMS.
+This function is called by `org-babel-execute-src-block'.
+
+The BODY can be any code which allowed executed in Eshell.
+Eshell allow to execute normal shell command and Elisp code.
+More details please reference Eshell Info.
+
+The PARAMS are variables assignments."
+  (let* ((session (org-babel-eshell-initiate-session
+		   (cdr (assq :session params))))
+	 (full-body (org-babel-expand-body:generic
+		     body params (org-babel-variable-assignments:eshell params))))
+    (if session
+	(progn
+	  (with-current-buffer session
+	    (dolist (line (split-string full-body "\n"))
+	      (goto-char eshell-last-output-end)
+	      (insert line)
+	      (eshell-send-input))
+	    ;; get output of last input
+	    ;; TODO: collect all output instead of last command's output.
+	    (goto-char eshell-last-input-end)
+	    (buffer-substring-no-properties (point) eshell-last-output-start)))
+      (with-temp-buffer
+	(eshell-command full-body t)
+	(buffer-string)))))
+
+(defun org-babel-prep-session:eshell (session params)
+  "Prepare SESSION according to the header arguments specified in PARAMS."
+  (let* ((session (org-babel-eshell-initiate-session session))
+	 ;; Eshell session buffer is read from variable `eshell-buffer-name'.
+	 (eshell-buffer-name session)
+	 (var-lines (org-babel-variable-assignments:eshell params)))
+    (call-interactively #'eshell)
+    (mapc #'eshell-command var-lines)
+    session))
+
+(defun ob-eshell-session-live-p (session)
+  "Non-nil if Eshell SESSION exists."
+  (get-buffer session))
+
+(defun org-babel-eshell-initiate-session (&optional session _params)
+  "Initiate a session named SESSION."
+  (when (and session (not (string= session "none")))
+    (save-window-excursion
+      (unless (ob-eshell-session-live-p session)
+	(let ((eshell-buffer-name session)) (eshell))))
+    session))
+
+(defun org-babel-variable-assignments:eshell (params)
+  "Convert ob-eshell :var specified variables into Eshell variables assignments."
+  (mapcar
+   (lambda (pair)
+     (format "(setq %s %S)" (car pair) (cdr pair)))
+   (org-babel--get-vars params)))
+
+(defun org-babel-load-session:eshell (session body params)
+  "Load BODY into SESSION with PARAMS."
+  (save-window-excursion
+    (let ((buffer (org-babel-prep-session:eshell session params)))
+      (with-current-buffer buffer
+	(goto-char (point-max))
+	(insert (org-babel-chomp body)))
+      buffer)))
+
+(provide 'ob-eshell)
+
+;;; ob-eshell.el ends here