Homepage: https://github.com/0x4b/header-file-mode
Author: Kirk Kelsey
Updated:
Assign a major mode for header files
By assigning header-file-mode to .h files in auto-mode-alist, header files we be opened in the mode used by the corresponding implementation file (as determined by the `find-file' package). If a corresponding file cannot be found, the mode assigned in `header-file-default-mode' is used. This is not a proper mode in its own right, simply a trampoline to other modes.