Using Emacs Lisp to export TXT/EPUB/PDF from Org Mode to the Supernote via Browse and Access

| supernote, org, emacs

I've been experimenting with the Supernote's Browse and Access feature because I want to be able to upload files quickly instead of waiting for Dropbox to synchronize. First, I want to store the IP address in a variable:

my-supernote-ip-address
(defvar my-supernote-ip-address "192.168.1.221")

Here's how to upload: 

(defun my-supernote-upload (filename &optional supernote-path)
  (interactive "FFile: ")
  (setq supernote-path (or supernote-path "/INBOX"))
  (let* ((boundary (mml-compute-boundary '()))
         (url-request-method "POST")
         (url-request-extra-headers
          `(("Content-Type" . ,(format "multipart/form-data; boundary=%s" boundary))))
         (url-request-data
          (mm-url-encode-multipart-form-data
           `(("file" . (("name" . "file")
                        ("filename" . ,(file-name-nondirectory filename))
                        ("content-type" . "application/octet-stream")
                        ("filedata" . ,(with-temp-buffer
                                         (insert-file-contents-literally filename)
                                         (buffer-substring-no-properties (point-min) (point-max)))))))
           boundary)))
    (with-current-buffer
        (url-retrieve-synchronously
         (format "http://%s:8089%s" my-supernote-ip-address supernote-path))
      (re-search-backward "^$")
      (prog1 (json-read)
        (kill-buffer)))))

HTML isn't supported. Text works, but it doesn't support annotation. PDF or EPUB could work. It would make sense to register this as an export backend so that I can call it as part of the usual export process. 

(defun my-supernote-org-upload-as-text (&optional async subtree visible-only body-only ext-plist)
  "Export Org format, but save it with a .txt extension."
  (interactive (list nil current-prefix-arg))
  (let ((filename (org-export-output-file-name ".txt" subtree))
        (text (org-export-as 'org subtree visible-only body-only ext-plist)))
    ;; consider copying instead of exporting so that #+begin_export html etc. is preserved
    (with-temp-file filename
      (insert text))
    (my-supernote-upload filename)))

(defun my-supernote-org-upload-as-pdf (&optional async subtree visible-only body-only ext-plist)
  (interactive (list nil current-prefix-arg))
  (my-supernote-upload (org-latex-export-to-pdf async subtree visible-only body-only ext-plist)))

(defun my-supernote-org-upload-as-epub (&optional async subtree visible-only body-only ext-plist)
  (interactive (list nil current-prefix-arg))
  (my-supernote-upload (org-epub-export-to-epub async subtree visible-only ext-plist)))

(org-export-define-backend
    'supernote nil
    :menu-entry '(?s "Supernote"
                     ((?s "as PDF" my-supernote-org-upload-as-pdf)
                      (?e "as EPUB" my-supernote-org-upload-as-epub)
                      (?o "as Org" my-supernote-org-upload-as-text))))

Adding this line to my Org file allows me to use \spacing{1.5} for 1.5 line spacing, so I can write in more annotations.. 

#+LATEX_HEADER+: \usepackage{setspace}

Sometimes I use custom blocks for HTML classes. When LaTeX complains about undefined environments, I can define them like this: 

#+LATEX_HEADER+: \newenvironment{whatever_my_custom_environment_is_called}

Now I can export a subtree or file to my Supernote for easy review.

I wonder if multimodal AI models can handle annotated images with editing marks…

This is part of my Emacs configuration.
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