No pipeline crash if NF version too old

[jfy133]

Describe the bug
Pipeline doesn't crash if minimum version not reached. Nextflow tries anyway and gives uncomprehnsiable error for a new user.

See here: https://www.nextflow.io/docs/latest/metadata.html#nextflow-metadata

if( !nextflow.version.matches('0.22+') ) {
    println "This workflow requires Nextflow version 0.22 or greater -- You are running version $nextflow.version"
    exit 1
}

[apeltzer]

I thought that isn't possible when the manifest specifies a minimum version @pditommaso might know better?

[pditommaso]

it should stop when prefixing the version with !, see here. Tho, there could be an issue in recent NF versions.

[jfy133]

I think the ! should do it. I'll try that now.

[ewels]

Linting updated in nf-core/tools#507

[jfy133]

I suggest we merge #345 until the new version of nf-core tools is released and I'll replace with the nextflow 'native' system. Therefore leaving this open

[apeltzer]

Aligned with template now, closing this