h5diff report mode should indicate when there is a diff due to a missing dataset in one file #6102
Description
Hello,
When running h5diff -r foo.hdf5 bar.hdf5 I get an output like
group : </> and </>
0 differences found
group : </data> and </data>
0 differences found
dataset: </data/foo> and </data/foo>
0 differences found
dataset: </data/bar> and </data/bar>
0 differences found
dataset: </data/foofoo> and </data/foofoo>
0 differences found
dataset: </data/boo> and </data/boo>
0 differences found
dataset: </data/baz> and </data/baz>
0 differences found
dataset: </data/biz> and </data/biz>
0 differences found
Which looks like it's reporting no diffs, however, the return code is non-zero. I find this very confusing and if I was using a shell configuration that didn't provide any visual indicators for non-zero return codes I wouldn't know any better.
-v can be used to show
file1 file2
---------------------------------------
x x /
x x /data
x x /data/foo
x x /data/bar
x x /data/foofoo
x x /data/boo
x /data/booboo
x x /data/baz
x x /data/biz
But it would be nice if there was some indication from report mode about this situation, e.g. at the end "Missing datasets detected, run with -v to view"
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