ggkochanski opened a new pull request, #132:
URL: https://github.com/apache/maven-help-plugin/pull/132
Overlapping parameter expression for goal `help:evaluate` by default:
`handleResponse("${" + expression + "}", output);`
limits usage for more complex expressions, e.g.
`mvn help:evaluate -Dexpression='project_version=${project.version}'`
which currently fails with message:
`null object or invalid expression`
Skipping the overlapping when an expression already contains string '${'
removes this limitation and allows to define expression in the same way as in
the interactive mode:
`echo 'project_version=${project.version}'|mvn help:evaluate`
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