Need syntax help declaring a closure or comparator for collectFile sort option

[mribeirodantas (Marcel Ribeiro-Dantas)]

I think that’s what you’re looking for:

workflow {
    channel.of(
        "A1,0000,c0",
        "A1,0000,c1",
        "A1,0000,c2",
        "A1,0000,c3",
        "A1,0000,c4",
        "B1,0000,c0",
        "B1,0000,c1",
        "B1,0000,c2",
        "B1,0000,c3",
        "B1,0000,c4",
        "A1,0001,c0",
        "A1,0001,c1",
        "A1,0001,c2",
        "B1,0001,c3",
        "B1,0001,c4",
    )
    .collectFile(seed: "WELL,TILE,CYCLE", name: 'tile-well-list.csv', newLine: true,
      sort: { it -> it.tokenize(',')[2] }
    )
}

tree work

Output file:

WELL,TILE,CYCLE
A1,0000,c0
B1,0000,c0
A1,0001,c0
A1,0000,c1
B1,0000,c1
A1,0001,c1
A1,0000,c2
B1,0000,c2
A1,0001,c2
A1,0000,c3
B1,0000,c3
B1,0001,c3
A1,0000,c4
B1,0000,c4
B1,0001,c4