package_dependencies: Computations on the Dependency Hierarchy of Packages

Description Usage Arguments Value See Also Examples

Description

Find (recursively) dependencies or reverse dependencies of packages.

Usage

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  package_dependencies(packages = NULL, db,
    which = c("Depends", "Imports", "LinkingTo"),
    recursive = FALSE, reverse = FALSE)

Arguments

packages

a character vector of package names.

db

character matrix as from available.packages(), or data frame variants thereof. Alternatively, a package database like the one available from http://cran.R-project.org/web/packages/packages.rds

which

a character vector listing the types of dependencies, a subset of c("Depends", "Imports", "LinkingTo", "Suggests", "Enhances"). Character string "all" is shorthand for that vector, character string "most" for the same vector without "Enhances".

recursive

logical: should (reverse) dependencies of (reverse) dependencies (and so on) be included?

reverse

logical: if FALSE (default), regular dependencies are calculated, otherwise reverse dependencies.

Value

Named list with one element for each package in argument packages, each consists of a character vector naming the (recursive) (reverse) dependencies of that package.

For given packages which are not found in the db, NULL entries are returned, as opposed to character(0) entries which indicate no dependencies.

See Also

dependsOnPkgs, and package.dependencies for checking dependencies

Examples

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## Not run: 
pdb <- available.packages()
deps <- package_dependencies(packages = "MASS", pdb,
                            which = c("Depends", "Imports", "LinkingTo", "Suggests"),
                            recursive = TRUE, reverse = TRUE)
length(deps$MASS)

## End(Not run)

Dasonk/future2.15 documentation built on May 6, 2019, 1:37 p.m.