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ob-plantuml.el
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ob-plantuml.el
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;;; ob-plantuml.el --- Babel Functions for Plantuml -*- lexical-binding: t; -*-
;; Copyright (C) 2010-2025 Free Software Foundation, Inc.
;; Author: Zhang Weize
;; Keywords: literate programming, reproducible research
;; URL: 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 | https://plantuml.com/
;; plantuml.jar | `org-plantuml-jar-path' should point to the jar file (when exec mode is `jar')
;;; Code:
(require 'org-macs)
(org-assert-version)
(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-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-args (list "-headless")
"The arguments passed to plantuml 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* ((do-export (member "file" (cdr (assq :result-params params))))
(out-file (if do-export
(or (cdr (assq :file params))
(error "No :file provided but :results set to file. For plain text output, set :results to verbatim"))
(org-babel-temp-file "plantuml-" ".txt")))
(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-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 `(,java
"-jar"
,(shell-quote-argument (expand-file-name org-plantuml-jar-path))
,@org-plantuml-args))))
(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"))
("tikz" '("-tlatex:nopreamble"))
("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) ""))
(unless do-export (with-temp-buffer
(insert-file-contents out-file)
(buffer-substring-no-properties
(point-min) (point-max))))))
(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