Auto labeling environments in AUCTeX

Question

If I insert some environment in AUCTeX by C-c C-e (for example equation or figure) then AUCTeX ask for a label with auto-inserted text eq: or fig:.

I would like to add theorem environment to LaTeX environments in AUCTeX. I done this by

(add-hook 'LaTeX-mode-hook
        (lambda ()
          (LaTeX-add-environments
            '("theorem" LaTeX-env-label)
)))

Moreover I hove something like

(setq reftex-label-alist
      '(
        ("theorem" ?t "thm:" "~\\ref{%s}" t  ("theorem" "th."))
        ))

Then when I use C-c C-e to add theorem environment then it ask for a label for a theorem but without auto thm: text. I need to add this manually.

Is it possible to make AUCTeX add theorem environment acts the same as equation or figure adding auto thm: text to a label?

To clarify, if I add theorem environment without a label and then use C-c ( to use RefTeX to add a label then it ask for a label in the form thm:.

Answer 1

Finally got it.

I was not aware that after adding something like

(setq reftex-label-alist
      '(
        ("theorem" ?t "thm:" "~\\ref{%s}" t  ("theorem" "th."))
        ))

to my .emacs I should do

reftex-reset-mode

If I put this into .emacs after my RefTeX options then everything works great.