Variable: buffer-file-format
buffer-file-format is a buffer-local variable defined in buffer.c.
Documentation
List of formats to use when saving this buffer.
Formats are defined by format-alist. This variable is
set when a file is visited.
Probably introduced at or before Emacs version 19.29.
Source Code
// Defined in /usr/src/emacs/src/buffer.c
DEFVAR_PER_BUFFER ("buffer-file-format", &BVAR (current_buffer, file_format), Qnil,
doc: /* List of formats to use when saving this buffer.
Formats are defined by `format-alist'. This variable is
set when a file is visited. */);