single_result: Access a single artifact.
In lbartnik/ui: User Interface for Artifact Repository

dispatch_result makes the decision whether to return a wrapped query object for further narrowing of the query, or a single_result object which wraps a single artifact retrieved from a repository::repository.

new_single_result creates a simple wrapper around an artifact. It then dispatches calls to print and exposes additional operations via the dollar operator $.

dispatch_result(q)

new_single_result(artifact)

## S3 method for class 'single_result'
print(x, ...)

`q`	a `query` object.
`artifact`	retrieved from a repository with repository::read_artifacts
`x`	an object used to select a method.
`...`	further arguments passed to or from other methods.