Minimal standards checks

A typical standards check will look like:

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def check_playbook_for_something(candidate, settings):
    result = Result(candidate.path) # empty result is a success with no output
    with open(candidate.path, 'r') as f:
        for (lineno, line) in enumerate(f):
            if line is dodgy:
                # enumerate is 0-based so add 1 to lineno
                result.errors.append(Error(lineno+1, "Line is dodgy: reasons"))
    return result

All standards check take a candidate object, which has a path attribute. The type can be inferred from the class name (i.e. type(candidate).__name__) or from the table here.

They return a Result object, which contains a possibly empty list of Error objects. Error objects are formed of a line number and a message. If the error applies to the whole file being reviewed, set the line number to None. Line numbers are important as ansible-later can review just ranges of files to only review changes (e.g. through piping the output of git diff to ansible-later).