Uses requireNamespace() to check if a package is already installed and
provides options for issuing an error, warning, etc. in case the package is
not installed.
Usage
check_for_pkg(package, func = stop)
Arguments
- package
the name of the package to check for
- func
what should this check call if the package is not installed?
This can be any function, but stop, warning, skip, etc. are likely
candidates (default: stop)
Value
TRUE if the package is installed, FALSE if it is not (invisibly)
Details
It is only exported for use in examples.
Examples
check_for_pkg("DBI")
check_for_pkg("no-such-package", func = message)
#> The package no-such-package isn't installed but is needed for this action.
#> Please install it with install.packages("no-such-package") and try again.
