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Summary

Org-Drill is an extension for Org mode. Org-Drill uses a spaced repetition algorithm to conduct interactive "drill sessions", using org files as sources of facts to be memorised. I want to track the progress made for each drill session by saving some counts together with a timestamp to a seperate file drill-stats.csv.

This is a simple example how to save a timestamp after each drill session.

  (setq my-drill-stats-file "/tmp/drill-stats.csv")

  (defun my-save-final-report ()
    (write-region (format "%s\n" (current-time-string))
        nil my-drill-stats-file 'append))
     
  (advice-add 'org-drill-final-report :before 'my-save-final-report)

This is an example file that contains org-drill drawers.

* first                                                               :drill:
  SCHEDULED: <2017-05-14 So>
  :PROPERTIES:
  :ID:       4e74e88d-b9c2-4c7e-b8a2-db3369d563b6
  :DRILL_LAST_INTERVAL: 4.14
  :DRILL_REPEATS_SINCE_FAIL: 2
  :DRILL_TOTAL_REPEATS: 1
  :DRILL_FAILURE_COUNT: 0
  :DRILL_AVERAGE_QUALITY: 5.0
  :DRILL_EASE: 2.6
  :DRILL_LAST_QUALITY: 5
  :DRILL_LAST_REVIEWED: [2017-05-10 Mi 22:59]
  :END:
 question
** result
   bla
* first 2                                                             :drill:
  SCHEDULED: <2017-05-14 So>
  :PROPERTIES:
  :ID:       a39f420f-a1f4-4350-af63-828423472df1
  :DRILL_LAST_INTERVAL: 3.86
  :DRILL_REPEATS_SINCE_FAIL: 2
  :DRILL_TOTAL_REPEATS: 1
  :DRILL_FAILURE_COUNT: 0
  :DRILL_AVERAGE_QUALITY: 3.0
  :DRILL_EASE: 2.36
  :DRILL_LAST_QUALITY: 3
  :DRILL_LAST_REVIEWED: [2017-05-10 Mi 22:59]
  :END:
  question
** result
   bla

The problem I want to solve is to extend the function my-save-final-report (see above and https://github.com/ibayer/dotfiles/blob/emacs/_emacs.d/lisp/init-org.el#L387) to append the count for each possible DRILL_LAST_QUALITY (0:5) to the file drill-stats.csv for each entry with the :drill: tag.
The correct entry for the example given above would be:

drill-stats.csv (only values 3 and 5 are in the file)

Wed May 10 22:59:40 2017, 0, 0, 0, 1, 0, 1

I would appreciate any ideas on how to solve this task.

References that might be useful:

• collect properties into tables: http://orgmode.org/worg/org-contrib/org-collector.html
• manual solution: https://bitbucket.org/eeeickythump/org-drill/issues/34/org-drill-stats