Variable: indent-region-function
indent-region-function is a variable defined in indent.el.gz.
Documentation
Short cut function to indent region using indent-according-to-mode.
Default is to really run indent-according-to-mode on each line.
Source Code
;; Defined in /usr/src/emacs/lisp/indent.el.gz
(defvar indent-region-function #'indent-region-line-by-line
"Short cut function to indent region using `indent-according-to-mode'.
Default is to really run `indent-according-to-mode' on each line.")