Support for scattergather directive

[iromeo]

see https://snakemake.readthedocs.io/en/stable/snakefiles/rules.html#defining-scatter-gather-processes

Example: here scattergather defines split in scatter.split

scattergather:
    rule_a=4,
    rule_b=3,


rule all:
    input:
        "gathered/all_a.txt",
        "gathered/all_b.txt",


rule split_a:
    output:
        scatter.rule_a("split_a/{scatteritem}.txt"),
    shell:
        "touch {output}"


rule split_b:
    output:
        scatter.rule_b("split_b/{scatteritem}.txt"),
    shell:
        "touch {output}"


rule intermediate_a:
    input:
        "split_a/{scatteritem}.txt",
    output:
        "split_a/{scatteritem}.post.txt",
    shell:
        "cp {input} {output}"


rule intermediate_b:
    input:
        "split_b/{scatteritem}.txt",
    output:
        "split_b/{scatteritem}.post.txt",
    shell:
        "cp {input} {output}"


rule gather_a:
    input:
        gather.rule_a("split_a/{scatteritem}.post.txt"),
    output:
        "gathered/all_a.txt",
    shell:
        "cat {input} > {output}"


rule gather_b:
    input:
        gather.rule_b("split_b/{scatteritem}.post.txt"),
    output:
        "gathered/all_b.txt",
    shell:
        "cat {input} > {output}"

[iromeo]

Need code completion for scatter and gatter objects