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name: lisp/ob-plantuml.el 	 # note: path name is non-authoritative(*)

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;;; ob-plantuml.el --- Babel Functions for Plantuml  -*- lexical-binding: t; -*-

;; Copyright (C) 2010-2019 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
;; http://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))

(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 ((assignments (org-babel-variable-assignments:plantuml params)))
    (if (string-prefix-p "@start" body t) assignments
      (format "@startuml\n%s\n@enduml"
	      (org-babel-expand-body:generic body params assignments)))))

(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 (string-join
	       (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 "")
    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

debug log:

solving aeea1802f ...
found aeea1802f in https://list.orgmode.org/orgmode/87h82sucvn.fsf@gmail.com/
found 09c9a3334 in https://git.savannah.gnu.org/cgit/emacs/org-mode.git
preparing index
index prepared:
100644 09c9a333463276ff17be763269a5042f92a40817	lisp/ob-plantuml.el

applying [1/1] https://list.orgmode.org/orgmode/87h82sucvn.fsf@gmail.com/
diff --git a/lisp/ob-plantuml.el b/lisp/ob-plantuml.el
index 09c9a3334..aeea1802f 100644

Checking patch lisp/ob-plantuml.el...
Applied patch lisp/ob-plantuml.el cleanly.

index at:
100644 aeea1802fdd6ec311cde8615a6292c762c79df9a	lisp/ob-plantuml.el

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