Re: called by a process filter?

[Richard Stallman]

    Is there a way to tell whether a function was called via process filter?

Not currently.

We could envision making the code that calls process filters
bind this-command to the process that sent the output.
That is an incompatible change, but your arguments show
that probably the code that runs in filters would not want
to test this-command, so it probably won't break anything.

We could also create a new variable, perhaps this-process,
and bind that instead.  I think the former is more elegant.