Include pipefail in ansible shell command if there is pipe

ShellPipefail.py

from ansiblelint import AnsibleLintRule

def uncorrect_task(task, cmd):
    if 'shell' not in task:
        return False
    if 'register' in task:
        return False
    if task.get('ignore_errors'):
        return False

    if isinstance(task['shell'], dict):
        args = task['shell']['cmd'].split()
    else:
        args = task['shell'].split()
    if not set(args).isdisjoint(cmd) and 'pipefail' not in args:
        return True

    return False

class ShellPipefail(AnsibleLintRule):
    id = 'OOOQ0001'
    shortdesc = 'Shell should have a pipefail'
    description = 'Shell commands should have "set -o pipefail" if using PIPE'
    tags = ['shell']
    cmd = ["|", "timestamper_cmd"]

    def matchplay(self, file, play):
        ret = []
        if play.get('block') and not play.get('ignore_errors'):
            block = play['block']
            for task in block:
                if uncorrect_task(task, self.cmd):
                    ret.append((file, self.shortdesc))
        else:
            if uncorrect_task(play, self.cmd):
                ret.append((file, self.shortdesc))
        return ret