CODEWITHSUNDEEP
emacselisphook
Chillar Anand
Chillar Anand

Reputation: 29534

emacs - after-change-functions are not executed after buffer modification

I have added a function to after-change-functions list using this code

(defun test-func () 
    (message "foo")) 

(add-hook 'after-change-functions 'test-func nil t)

Now whenever i change buffer manually, test-func is getting called. But when i programatically modify the buffer using insert, the contents of buffer are getting updated, but test-func is not getting called.

Any pointers on how to activate test-func everytime buffer is updated?

Update:

I am trying to convert markdown to html and serve that on browser, so that whenever user types some markdown, html will be updated automatically.

Here is original implementation of test-func

(defun impatient-markup-update (&rest args)
  "Update html buffer if markup buffer updates."
  (save-buffer impatient-markup-buffer)
  (with-current-buffer (get-buffer impatient-markup-html-buffer)
    (erase-buffer)
    (insert (shell-command-to-string 
             (format "%s %s" impatient-markup-pandoc impatient-markup-buffer)))))

Upvotes: 3

Views: 877

Answers (1)

Drew
Drew

Reputation: 30699

Use sleep-for after the call to message, as a test, to see whether you see the message then.

after-change-functions does not necessarily run your hook in the buffer you expect. And as the doc says:

*Buffer changes made while executing the after-change-functions don't call any before-change or after-change functions. That's because inhibit-modification-hooks is temporarily set non-nil.

Check what else is on that hook, etc. IOW, do a little debugging.

Upvotes: 2

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