graphvizVersion: A function to determine graphviz library version
Description
This function will query the graphviz libraries that the package was
built against and report what version of Graphviz is being used.
Usage
graphvizVersion()
Arguments
Value
A list with three elements, two of class numeric_version. The first
element named installed_version represents the version of
Graphviz that is being used by the package. The second element named
build_version represents the version of Graphviz that was used
to build the package. A mismatch between these two versions may
indicate problems. The third element is a logical named
bundled_graphviz and indicates if Rgraphviz is using the
bundled Graphviz (default) or an external Graphviz.