Earlier quoted context omitted.
Those kinds of tools aren't new or emerging. The "indent" utility for C has been around for decades. I first remember using it on 4.3BSD, but it may have been around before that.
indent - indent and format C program source HISTORY The indent command appeared in 4.2BSD. And for context, 4.2BSD was released in 1983.
NAME
cb - C program beautifier
SYNOPSIS
cb
DESCRIPTION
Cb places a copy of the C program from the standard input on the stan-
dard output with spacing and indentation that displays the structure of
the program.