Switch to IN-PROGRESS when clocking in

When a task is TODO and I clock in, automatically switch it to
IN-PROGRESS. Leave it as is if it's any other state.

oni-org.el

@@ -4,7 +4,7 @@
 
 ;; Author: Tom Willemse <tom@ryuslash.org>
 ;; Keywords: local
-;; Version: 20190721235442
+;; Version: 20190815163343
 ;; Package-Requires: (org-plus-contrib org-bullets hydra org-wild-notifier)
 
 ;; This program is free software; you can redistribute it and/or modify
@@ -29,6 +29,7 @@
 (require 'hydra)
 (require 'org)
 (require 'org-capture)
+(require 'org-clock)
 (require 'org-habit)
 
 (defun oni-org-expand-to-home (file-name)
@@ -98,6 +99,12 @@ After running it once remove it from `org-capture-after-finalize-hook'."
     (setf (frame-height) 24)
     (add-hook 'org-capture-after-finalize-hook 'oni-org-delete-frame-once)))
 
+(defun oni-org-maybe-change-todo-state (current-state)
+  "Change the state of the current task to in-progress CURRENT-STATE is todo."
+  (if (string= current-state "TODO")
+      "IN-PROGRESS"
+    current-state))
+
 ;;;###autoload
 (defun oni-org-open-index ()
   "Open the index of my org-based personal wiki."
@@ -123,6 +130,7 @@ After running it once remove it from `org-capture-after-finalize-hook'."
 (setq org-log-into-drawer t)
 (setq org-agenda-todo-ignore-scheduled 'future)
 (setq org-agenda-skip-function-global #'oni-org-skip-tasks)
+(setq org-clock-in-switch-to-state #'oni-org-maybe-change-todo-state)
 
 (setq org-agenda-custom-commands
       '(("c" "Today's (Current) tasks" tags "SCHEDULED=\"<today>\"")))