Variable: buffer-file-truename
buffer-file-truename is a buffer-local variable defined in buffer.c.
Documentation
Abbreviated truename of file visited in current buffer, or nil if none.
The truename of a file is calculated by file-truename
and then abbreviated with abbreviate-file-name.
Source Code
// Defined in /usr/src/emacs/src/buffer.c
DEFVAR_PER_BUFFER ("buffer-file-truename", &BVAR (current_buffer, file_truename),
Qstringp,
doc: /* Abbreviated truename of file visited in current buffer, or nil if none.
The truename of a file is calculated by `file-truename'
and then abbreviated with `abbreviate-file-name'. */);