Re: [O] creating new #+KEYWORD: variables

[Matt Price]

On Sat, Nov 10, 2018 at 2:22 AM Nicolas Goaziou <address@hidden> wrote:

Hello,

Matt Price <address@hidden> writes:

> I am writing this interface to my university's learning management system:
> https://github.com/titaniumbones/Org-Marking-Mode/tree/use-structured-course-def.
> I am only using hte exporting system tangentially and I have not defined a
> new exporter. However, I would really like to be able to set some variable
> values in the header section of hte document, e.g.:
>
> #+ORG_LMS_COURSE: becomingmodern

You can add keywords specific to a given export back-end in its
definition, more precisely in :options-alist value. For example, in
"ox-texinfo", there is

    (org-export-define-backend 'texinfo
      '((bold . org-texinfo-bold))
      ...
      :options-alist
      '((:texinfo-filename "TEXINFO_FILENAME" nil nil t)
        ...))

which means `texinfo' back-end should recognize the "#+TEXINFO_FILENAME"
keyword, and store its value in the :texinfo-filename property from
"info" paramater, which is passed to each function.

You can write a derived back-end using this new keyword, along with
a template function that actually uses it. Look at the definition of
`beamer' back-end for an example.

Thank you as always, Nicolas. I have not written a derived backend for this, though I guess many of the functions are export-like and in osme ways thatwould make a lot of sense. But I also need to use the course id to receive data from the courseware server, so for instance, right now I have this code: 

------

(defun org-lms-get-students (&optional course)

  (unless course

    (setq course org-lms-course))

  (let* ((courseid (plist-get course :id))

         (result

         (org-lms-canvas-request (format "courses/%s/users" courseid) "GET"

                                 '(("enrollment_type[]" . "student")

                                   ("include[]" . "email")))))

    (message "RESULTS")

    ;;(with-temp-file "students-canvas.json" (insert result))

    (loop for student in-ref result

          do

          (if (string-match "," (plist-get student :sortable_name))

              (let ((namelist  (split-string (plist-get student :sortable_name) ", ")))

                (plist-put student :lastname (car namelist) )

                (plist-put student :firstname (cadr namelist)))))

    result))

---

Is there aclever way to extract the value of ~org-lms-course~ from the exporter even if what I'm doing really isn't an export? I'm actually harvesting JSON data  from the server, rather than producing an export file.  

 

HTH,

--
Nicolas Goaziou