Is it possible to put a filename callback in a file and refer to it on the command line?

[zxrobinson]

I need to remove a bunch of binary files from a large repo. The files have extensions like .dll, .exe, .zip, etc. There are 20 different suffixes. I think I can write the callback, but I'd rather put it in a file. Is there a way to do that?

[newren]

Yes, as documented in the manual:

$ git filter-repo -h
[...snip...]
CALLBACKS

    Most callback functions are of the same general format.  For a command line
    argument like
      --foo-callback 'BODY'

[...snip...]

    Note that if BODY resolves to a filename, then the contents of that file
    will be used as the BODY in the callback function.

[...snip...]