ob-plantuml defun

(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)) ""))
     (full-body (org-babel-plantuml-make-body body params))
     (cmd (if (string= "" org-plantuml-jar-path)
          (error "`org-plantuml-jar-path' is not set")
        (concat "java " java " -jar "
            (shell-quote-argument
             (expand-file-name org-plantuml-jar-path))
            (if (string= (file-name-extension out-file) "png")
                " -tpng" "")
            (if (string= (file-name-extension out-file) "svg")
                " -tsvg" "")
            (if (string= (file-name-extension out-file) "eps")
                " -teps" "")
            (if (string= (file-name-extension out-file) "pdf")
                " -tpdf" "")
            (if (string= (file-name-extension out-file) "tex")
                " -tlatex" "")
            (if (string= (file-name-extension out-file) "vdx")
                " -tvdx" "")
            (if (string= (file-name-extension out-file) "xmi")
                " -txmi" "")
            (if (string= (file-name-extension out-file) "scxml")
                " -tscxml" "")
            (if (string= (file-name-extension out-file) "html")
                " -thtml" "")
            (if (string= (file-name-extension out-file) "txt")
                " -ttxt" "")
            (if (string= (file-name-extension out-file) "utxt")
                " -utxt" "")
            " -p " cmdline " < "
            (org-babel-process-file-name in-file)
            " > "
            (org-babel-process-file-name out-file)))))
    (unless (file-exists-p org-plantuml-jar-path)
      (error "Could not find plantuml.jar at %s" org-plantuml-jar-path))
    (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