pkgDesc {sfsmisc}

Version of packageDescription() as Simple Vector

Description

a simple “version”, or wrapper for packageDescription(), returning a named character vector, including "file", and still has a useful print() method.

Usage

pkgDesc (pkg, lib.loc = NULL, fields = NULL, ...)
pkgBuilt(pkg, lib.loc = NULL, ...)

Arguments

pkg

a character string, name of an installed R package.

lib.loc

library location to find the package in; the default NULL uses the full .libPaths().

fields

a character vector (or NULL) specifying fields to be returned.

...

further optional arguments passed to packageDescription().

Value

a named character vector, with names, the fields, identical to the names of the list returned by packageDescription, plus its "file" attribute. Additionally the resulting vector is of class "Dlist" which activates a useful print() method.

Note

The file is always returned; not the least that the author wants to see it quite often as his .libPaths() is non-trivial and typically longer than 4 entries.

Author(s)

Martin Maechler, Jan. 2021

See Also

packageDescription, .libPaths.

Examples

str(pd <- pkgDesc("sfsmisc"))
pd[c("Date","Packaged", "Built","file")]

pkgBuilt("sfsmisc")

## Show "Built" (and "file") for all packages whose namespaces are loaded:
lNs <- loadedNamespaces()
mlNs <- sapply(lNs, pkgBuilt)
t(mlNs) # typically prints nicely

pkgs <- c("grid", "lattice", "MASS", "Matrix", "nlme", "lme4", "sfsmisc")
pkgs <- c("foobar", "barbar", pkgs, "kitty") # + names that typically don't exist
pkgsOk <- basename(find.package(pkgs, quiet=TRUE))
mpkg <- sapply(pkgsOk, pkgBuilt)
stopifnot(is.matrix(mpkg), nrow(mpkg) == 2)
mpkg["Built",]