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+;;; ob-plantuml.el --- Babel Functions for Plantuml  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2010-2021 Free Software Foundation, Inc.
+
+;; Author: Zhang Weize
+;; Keywords: literate programming, reproducible research
+;; Homepage: 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 <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Org-Babel support for evaluating plantuml script.
+;;
+;; Inspired by Ian Yang's org-export-blocks-format-plantuml
+;; https://www.emacswiki.org/emacs/org-export-blocks-format-plantuml.el
+
+;;; Requirements:
+
+;; plantuml     | http://plantuml.sourceforge.net/
+;; plantuml.jar | `org-plantuml-jar-path' should point to the jar file (when exec mode is `jar')
+
+;;; Code:
+(require 'ob)
+
+(defvar org-babel-default-header-args:plantuml
+  '((:results . "file") (:exports . "results"))
+  "Default arguments for evaluating a plantuml source block.")
+
+(defcustom org-plantuml-jar-path ""
+  "Path to the plantuml.jar file."
+  :group 'org-babel
+  :version "24.1"
+  :type 'string)
+
+(defcustom org-plantuml-exec-mode 'jar
+  "Method to use for PlantUML diagram generation.
+`jar' means to use java together with the JAR.
+The JAR can be configured via `org-plantuml-jar-path'.
+
+`plantuml' means to use the PlantUML executable.
+The executable can be configured via `org-plantuml-executable-path'.
+You can also configure extra arguments via `org-plantuml-executable-args'."
+  :group 'org-babel
+  :package-version '(Org . "9.4")
+  :type 'symbol
+  :options '(jar plantuml))
+
+(defcustom org-plantuml-executable-path "plantuml"
+  "File name of the PlantUML executable."
+  :group 'org-babel
+  :package-version '(Org . "9.4")
+  :type 'string)
+
+(defcustom org-plantuml-executable-args (list "-headless")
+  "The arguments passed to plantuml executable when executing PlantUML."
+  :group 'org-babel
+  :package-version '(Org . "9.4")
+  :type '(repeat string))
+
+(defcustom org-babel-plantuml-svg-text-to-path nil
+  "When non-nil, export text in SVG images to paths using Inkscape."
+  :group 'org-babel
+  :package-version '(Org . "9.5")
+  :type 'boolean)
+
+(defun org-babel-variable-assignments:plantuml (params)
+  "Return a list of PlantUML statements assigning the block's variables.
+PARAMS is a property list of source block parameters, which may
+contain multiple entries for the key `:var'.  `:var' entries in PARAMS
+are expected to be scalar variables."
+  (mapcar
+   (lambda (pair)
+     (format "!define %s %s"
+	     (car pair)
+	     (replace-regexp-in-string "\"" "" (cdr pair))))
+   (org-babel--get-vars params)))
+
+(defun org-babel-plantuml-make-body (body params)
+  "Return PlantUML input string.
+
+BODY is the content of the source block and PARAMS is a property list
+of source block parameters.  This function relies on the
+`org-babel-expand-body:generic' function to extract `:var' entries
+from PARAMS and on the `org-babel-variable-assignments:plantuml'
+function to convert variables to PlantUML assignments.
+
+If BODY does not contain @startXXX ... @endXXX clauses, @startuml
+... @enduml will be added."
+  (let ((full-body
+	 (org-babel-expand-body:generic
+	  body params (org-babel-variable-assignments:plantuml params))))
+    (if (string-prefix-p "@start" body t) full-body
+      (format "@startuml\n%s\n@enduml" full-body))))
+
+(defun org-babel-execute:plantuml (body params)
+  "Execute a block of plantuml code with org-babel.
+This function is called by `org-babel-execute-src-block'."
+  (let* ((out-file (or (cdr (assq :file params))
+		       (error "PlantUML requires a \":file\" header argument")))
+	 (cmdline (cdr (assq :cmdline params)))
+	 (in-file (org-babel-temp-file "plantuml-"))
+	 (java (or (cdr (assq :java params)) ""))
+	 (executable (cond ((eq org-plantuml-exec-mode 'plantuml) org-plantuml-executable-path)
+			   (t "java")))
+	 (executable-args (cond ((eq org-plantuml-exec-mode 'plantuml) org-plantuml-executable-args)
+				((string= "" org-plantuml-jar-path)
+				 (error "`org-plantuml-jar-path' is not set"))
+				((not (file-exists-p org-plantuml-jar-path))
+				 (error "Could not find plantuml.jar at %s" org-plantuml-jar-path))
+				(t (list java
+					 "-jar"
+					 (shell-quote-argument (expand-file-name org-plantuml-jar-path))))))
+	 (full-body (org-babel-plantuml-make-body body params))
+	 (cmd (mapconcat #'identity
+			 (append
+			  (list executable)
+			  executable-args
+			  (pcase (file-name-extension out-file)
+			    ("png" '("-tpng"))
+			    ("svg" '("-tsvg"))
+			    ("eps" '("-teps"))
+			    ("pdf" '("-tpdf"))
+			    ("tex" '("-tlatex"))
+			    ("vdx" '("-tvdx"))
+			    ("xmi" '("-txmi"))
+			    ("scxml" '("-tscxml"))
+			    ("html" '("-thtml"))
+			    ("txt" '("-ttxt"))
+			    ("utxt" '("-utxt")))
+			  (list
+			   "-p"
+			   cmdline
+			   "<"
+			   (org-babel-process-file-name in-file)
+			   ">"
+			   (org-babel-process-file-name out-file)))
+			 " ")))
+    (with-temp-file in-file (insert full-body))
+    (message "%s" cmd) (org-babel-eval cmd "")
+    (if (and (string= (file-name-extension out-file) "svg")
+             org-babel-plantuml-svg-text-to-path)
+        (org-babel-eval (format "inkscape %s -T -l %s" out-file out-file) ""))
+    nil)) ;; signal that output has already been written to file
+
+(defun org-babel-prep-session:plantuml (_session _params)
+  "Return an error because plantuml does not support sessions."
+  (error "Plantuml does not support sessions"))
+
+(provide 'ob-plantuml)
+
+;;; ob-plantuml.el ends here