Adding seqkit concat

[DLBPointon]

Adding the seqkit concat command.

PR checklist

Closes #XXX

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[DLBPointon]

Ok, it looks like concat will produce the file of the concatenated results like it should. However, they will not be in any particular order from run to run. Need to swap the md5sum to a file contains assertion.

[heuermh]

https://bioinf.shenwei.me/seqkit/usage/

Reproducibility

Subcommands sample and shuffle use random function, random seed could be given by flag -s (--rand-seed). This makes sure that sampling result could be reproduced in different environments with same random seed.

Wonder if this is also true for concat?

concatenate sequences with same ID from multiple files

Attentions:
...
4. Order of sequences with different IDs are random.

[DLBPointon]

https://bioinf.shenwei.me/seqkit/usage/

Reproducibility
Subcommands sample and shuffle use random function, random seed could be given by flag -s (--rand-seed). This makes sure that sampling result could be reproduced in different environments with same random seed.

Wonder if this is also true for concat?

concatenate sequences with same ID from multiple files
Attentions:
...
4. Order of sequences with different IDs are random.

Ah the docs, would have made sense if I read those too. Thanks for confirming what I thought.

[heuermh]

Sorry, a little fast on the commit suggestion button! Mistaked this open pull request for my own 😬

[DLBPointon]

Sorry, a little fast on the commit suggestion button! Mistaked this open pull request for my own 😬

No worries, just means you're a maintainer now too

[jasmezz]

I would remove def args in stub if it is not used. Actually I don't know if there is a recommendation, but it saves 1 line of code 🤷

[jasmezz]

On the other hand, it keeps it a bit more similar to the normal test. So whichever is fine, I think.

[DLBPointon]

To be fair, in my other modules, I have only kept prefixes because they are actually used. So removing it is good for consistency at least? Like you said it is a waste line.

[jasmezz]

I do the same for my modules ;) So feel free to update that and then ready to merge 🚀