Function to get channel structure and files names

[LouisLeNezet]

Hi,

I would be interested into a function that would enable to snapshot a channel without testing the md5sum of the files in it.
The rational behind that is that in nf-core we often want to know what is inside a resulting channel of a module / subworkflow / function but due to timestamp some files cannot be checked.

The function getAllFilesFromDir would work well for workflow but it would be nice to have an equivalent for a channel.
For example, if I have a modules giving back the following:

output = Channel.of([[id:"id1", sample:"sample1"], [path/to/work/file1.bam, path/to/work/file2.bam], [path/to/work/file1.bai, path/to/work/file2.bai], path/to/work/genome.fa])

I would like the output of the function getAllFilesFromChannel(process.out) or getAllFilesFromChannel(function.result) to be :

[
    [id:"id1", sample:"sample1"],
    [file1.bam, file2.bam],
    [file1.bai, file2.bai],
    genome.fa
]

It might need to work recursively to ensure that all path to files has been removed in array or dictionnary.

[LouisLeNezet]

Another solution would be to ask for nf-test to have a parameter to disable the md5sum check.