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POHow do I determine the namespace import order in [R]
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copied!<p>I need to clean up an R instance to return it to its on-launch virginal state. So far, what I'm doing is:</p> <p>On launch, record the loaded packages and namespaces</p> <pre><code>original_packages <- grep('^package:', search(), value = TRUE) original_namespaces <- loadedNamespaces() </code></pre> <p>When I need to flush the instance, detach each loaded package that was not there at launch:</p> <pre><code>for (pkg in grep('^package:', search(), value = TRUE)) { if (! pkg %in% original_packages){ detach(pkg, unload=TRUE, force=TRUE, character.only=TRUE) } } </code></pre> <p>The problem is that if I have loaded a package with a bunch of imported namespaces, such as ggplot2, those namespaces stay loaded, and I have to unload them in order of import, from high-level down. Just unloading them blindly doesn't work, as I get "namespace ‘x’ is imported by ‘y’, ‘z’ so cannot be unloaded" errors.</p> <p>Here is reproducible example:</p> <pre><code>original_packages <- grep('^package:', search(), value = TRUE) original_namespaces <- loadedNamespaces() library(ggplot2) library(plyr) loadedNamespaces() for (pkg in grep('^package:', search(), value = TRUE)) { if (! pkg %in% original_packages){ detach(pkg, unload=TRUE, force=TRUE, character.only=TRUE) } } for (ns in loadedNamespaces()) { if (! ns %in% original_namespaces){ unloadNamespace(ns) } } </code></pre> <p>Is there some way to figure out the namespace import hierarchy? If so, then I should just be able to order the last loop correctly...</p>

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