which-function-mode

which-function-mode is an interactive autoloaded compiled Lisp function in `which-func.el'.


(which-function-mode &optional ARG)

Toggle mode line display of current function (Which Function mode).
With a prefix argument ARG, enable Which Function mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.

Which Function mode is a global minor mode. When enabled, the
current function name is continuously displayed in the mode line,
in certain major modes.