Function: ebut:key-src-fmt
ebut:key-src-fmt is a function alias for hbut:key-src-fmt, defined in
hbut.el.
Signature
(ebut:key-src-fmt)
Documentation
Return unformatted filename associated with formatted current buffer.
This is used to obtain the source of Hyperbole buttons for buffers that represent the output of particular document formatters.