Feature request: dependencies() to scan NAMESPACE files

[mmuurr]

At present, dependencies() will perform a static analysis of R files. I find this very useful during development as a mechanism to help build the Imports section of a package's DESCRIPTION file; e.g.:

package_imports <- renv::dependencies("R/")$Package
purrr::walk(package_imports, usethis::use_package, type = "Imports", min_version = TRUE)

The only problem is the static analysis skips the NAMESPACE file, which itself is based on roxygen2 tags, and includes some imports. For example, I might have the tag #' @importFrom foo bar, yielding the NAMESPACE entry:

importFrom(foo, bar)

It'd be useful if dependencies() also read the NAMESPACE file to identify additional packages.

FWIW, there's a base parseNamespaceFile() function, which can be run (here from within the nascent package's root) like so:

parseNamespaceFile("packagename", "..")

One would still need to know how to deal with the various outputs -- each type corresponding to each unique NAMESPACE directive, but fortunately new NAMESPACE directives don't come around too often :-)

[mmuurr]

Amazing; thanks!