[oni-org] Add some Pomodoro[1] helper functions

- ‘oni-org-increment-property’: A generic command that increments a numeric org
  property

- ‘oni-org-pomodoro-add-note’: A command that adds a note to the org item
  logbook that states a pomodoro was completed.

- ‘oni-org-pomodoro-times’: A function that parses an org item logbook to figure
  out at what times a pomodoro had been completed for that particular task.

- ‘oni-org-pomodoro-times-for-date’: A function that finds the times a pomodoro
  has been marked as completed for a specified date.

- ‘oni-org-archive-old-tasks’: Unrelated to the other functions, just a command
  that archives all of the tasks that have been closed in the previous month.

[1]: https://francescocirillo.com/products/book-the-pomodoro-technique

oni-org/oni-org.el

@@ -958,7 +958,8 @@ placed above TARGET. Otherwise it will be placed below it."
                                   (let ((components (org-heading-components)))
                                     (list (cons 'done (and (org-entry-is-done-p) t))
                                           (cons 'title (nth 4 components))
-                                          (cons 'poms (string-to-number (or (alist-get "POMS" (org-entry-properties) nil nil #'string=) "0")))
+                                          (cons 'poms (length (oni-org-pomodoro-times-for-date
+                                                               (org-parse-time-string date))))
                                           (cons 'id (org-id-get-create)))))
                                 (format "TODO=\"NEXT\"|CLOSED>=\"<%s 0:00>\"+CLOSED<=\"<%s 23:59>\""
                                         date date)
@@ -991,5 +992,56 @@ placed above TARGET. Otherwise it will be placed below it."
 (defalias 'org-dblock-write:oni-pomodoro-overview 'oni-org-dblock-write-pomodoro-overview)
 (org-dynamic-block-define "oni-pomodoro-overview" #'oni-org-insert-pomodoro-overview)
 
+(defun oni-org-increment-property (property)
+  (interactive
+   (list (org-read-property-name)))
+  (let ((value (string-to-number (or (org-entry-get (point) property) "0"))))
+    (org-set-property property (number-to-string (1+ value)))))
+
+(add-to-list 'org-log-note-headings
+             (cons 'pomodoro "Finished a pomodoro on %t"))
+
+(defun oni-org-pomodoro-add-note ()
+  (interactive)
+  (org-add-log-setup 'pomodoro nil nil 'time))
+
+(defun oni-org-pomodoro-times ()
+  (let ((entry-beginning (org-entry-beginning-position))
+        (entry-end (org-entry-end-position))
+        results)
+    (save-excursion
+      (goto-char entry-beginning)
+      (save-match-data
+        (re-search-forward org-logbook-drawer-re entry-end)
+        (let ((logbook-beginning (match-beginning 0))
+              (logbook-end (match-end 0)))
+          (goto-char logbook-beginning)
+          (while (re-search-forward
+                  (rx "Finished a pomodoro on "
+                      (group "[" (one-or-more (not "]")) "]"))
+                  logbook-end t)
+            (push (org-parse-time-string (match-string 1)) results)))))
+    results))
+
+(defun oni-org-pomodoro-times-for-date (date)
+  (let ((day (decoded-time-day date))
+        (month (decoded-time-month date))
+        (year (decoded-time-year date)))
+    (seq-filter (lambda (time) (and (= (decoded-time-day time) day)
+                                    (= (decoded-time-month time) month)
+                                    (= (decoded-time-year time) year)))
+                (oni-org-pomodoro-times))))
+
+;;; Archive Management
+
+(defun oni-org-archive-old-tasks ()
+  "Archive tasks in all agenda files that were closed before the current month."
+  (interactive)
+  (let ((match (format-time-string "CLOSED<\"<%Y-%m-01>\"")))
+    (mapc (lambda (p)
+            (goto-char p)
+            (org-archive-subtree))
+          (reverse (org-map-entries #'point match 'agenda)))))
+
 (provide 'oni-org)
 ;;; oni-org.el ends here