Flag to suppress directory recursing?

[martinvonwittich]

When ripmime -i is given a directory name, it'll automatically recurse into that directory:

martin.mein-iserv.de ~ # mkdir foo
martin.mein-iserv.de ~ # touch foo/bar
martin.mein-iserv.de ~ # ripmime -i foo
input file is a directory, recursing
Unpacking mailpack foo/bar

This surprised us badly in a buggy shell script that used ripmime like this:

martin.mein-iserv.de ~ # cat test.sh
#!/bin/sh

for i in "$1"/*
do
  ripmime -i "$i" -d "/tmp/foo"
done

martin.mein-iserv.de ~ # ./test.sh                                                      
input file is a directory, recursing                                                    
Unpacking mailpack /bin/ab                                                              
Unpacking mailpack /bin/pidof                                                           
Unpacking mailpack /bin/ipmitool                                                        
Unpacking mailpack /bin/python3.9                                                       
Unpacking mailpack /bin/streamzip.bundled                                               
Unpacking mailpack /bin/uptftopl                                                        
Unpacking mailpack /bin/fincore        
Unpacking mailpack /bin/expect_tknewsbiff                                               
[...]

I feel like an option like --no-recurse to suppress this recursing behavior for situations where ripmime is only ever expected to process files might be useful to guard against such situations.