call_with_namespace: Load a package namespace and pass it to a function

In hughjonesd/apicheck: Explore the Historical API of R Packages

Description

The package is downloaded and installed if necessary, and its namespace is loaded. Then test(ns) is called with the namespace object, and its value is returned. On exit, the namespace is unloaded.

Usage

call_with_namespace(package, version, test, quiet = TRUE, ...)

Arguments

package	Package name.
version	Version as a character string.
test	A one-argument function.
quiet	Logical. Try to minimize output from package installation. (Some output comes from R CMD INSTALL and may be unavoidable.)
...	Arguments passed to versions::install.versions() or remotes::install_version(), and thence to install.packages(). Ncpus may be useful.

Value

The value returned by test.

Examples

## Not run: 
can_it_expand_urls <- function (namespace) "expand_urls" %in% names(namespace)
call_with_namespace("longurl", "0.3.0", test = can_it_expand_urls)

## End(Not run)

hughjonesd/apicheck documentation built on Sept. 9, 2019, 12:55 p.m.