tools (version 3.2.0)

package_dependencies: Computations on the Dependency Hierarchy of Packages

Description

Find (recursively) dependencies or reverse dependencies of packages.

Usage

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

Run this code
## 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)

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