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Create a generic combinator component #159

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@samuell

Description

I have this idea that you should be able to create a very generic component for producing combinations of parameters and file names, to feed downstream processes.

The specification for the combinations could either be some kind of text format, or a Go function.

A quick sketch of a Go version could be:

combinator := scipipe.NewCombinator()
combinator.Func = func() map[string]string {
    out := map[string][]string{
        "x": []string{},
        "y": []string{},
    }
    for _, x := range []string{"1", "2", "3"} {
        for _, y := range []string{"4", "5", "6"} {
            out["x"].append(x)
            out["y"].append(y)
        }
    }
    return out
}

While a text version might be:

combinator := scipipe.NewCombinator()
combinator.Spec = `
outfiles = glob("somefolder/*.fa")
  x = 1,2,3,4,5
    y = a,b,c,d,e,f,gh
`
// The indentation here could specify "folding", similar to how one would solve this using loops.

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