Return first argument invisibly for side effect functions

[nanxstats]

See https://style.tidyverse.org/functions.html?q=invisible#return for the rationale.

In particular, print.meta_adam().

Probably in the next release.

[fb-elong]

Could you show me the line of code? I did not see return() function in print.meta_adam()

[nanxstats]

@fb-elong Perhaps the the link I pasted was not accurately anchored because it's the latter half of the section, but here is the the exact quote:

If your function is called primarily for its side-effects (like printing, plotting, or saving to disk), it should return the first argument invisibly. This makes it possible to use the function as part of a pipe. print methods should usually do this, like this example from httr:

print.url <- function(x, ...) {
  cat("Url: ", build_url(x), "\n", sep = "")
  invisible(x)
}

[elong0527]

Got it. Would you want to create a PR?