I figured it out. The package name in the call to requireNamespace()
has to be a *text string*. I should've had:
fortOK <- requireNamespace("fortunes",quietly=TRUE)
So require() takes a package name, but requireNamespace() takes a
*string* specifying the package name. Trap for young players.
Psigh.
cheers,
Rolf Turner
On 11/18/18 11:16 AM, Rolf Turner wrote:
I am building a package which contains a function from which I wish to
call the fortune() function from the fortunes package --- if that
package is available.
I have place the line
Suggests: fortunes
in the DESCRIPTION file.
In my code for the function that I am writing (let's call it "foo")
I put
fortOK <- requireNamespace(fortunes,quietly=TRUE)
if(fortOK) {
fortunes::fortune()
}
thinking that I was following all of the prescriptions in "Writing R
Extensions". Yet when I do R CMD check on the package I get
* checking R code for possible problems ... NOTE
foo: no visible binding for global variable ‘fortunes’
Undefined global functions or variables:
fortunes
What am I doing wrong?
Thanks for any insight.
cheers,
Rolf Turner
P. S. I tried putting an "imports(fortunes)" in the NAMESPACE file, but
this just made matters worse:
* checking package dependencies ... ERROR
Namespace dependency not required: ‘fortunes’
Huh? What on earth is this actually saying? I cannot parse this error
message.
R. T.
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