In the Latest version I provided, (committed by Michael already) It will show BngProbhat in mode line. I am not sure how to make it shorter. Should we use simply "Probhat"? No other languages have any layout named probhat.
> From: Michael Albinus <michael.albinus@gmx.de>
> Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
> Date: Mon, 27 Jun 2016 11:32:04 +0200
>
> উৎসব রায় <uroybd@gmail.com> writes:
>
> > ;; Probhat Input Method
> > (quail-define-package "Probhat" "Bengali" "bengali-probhat" t "Probhat
> > for Bangla" nil t nil nil nil nil nil nil nil nil t)
>
> Are you sure? All other uses in indian.el have a small letter case
> package name, you take "Probhat". OTOH, all other uses take a title with
> capitel letters, you take "bengali-probhat".
More importantly, "bengali-probhat" is too long for an input method
indicator, it will take too much of the precious mode-line space. It
should be 1 to 3 characters.