Emacs function to locate related files
Emacs Lisp
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find-companion-thing.el - EMACS: locate and visit a companion file

Locate and visit a companion to the currently visited file.  Your
file has a companion when its filename differs in a predictable way
and is located in a predictable place.  If you want to quickly
switch between companions, this function might be for you.  As
written it supports C or C++, where you have .h vs .c, .c++, or
.cpp located in "include", "inc" and "src" or "source" sibling
directories. There is one function to call: fct/find-file.  It
toggles between the include and the source and the header, as