Skip to contents

cat, message, warning, and stop wrapped to fit the console's width.

Source: R/programming_helpers.R
wrap_str.Rd

These are convenience functions that format printed output to fit the width of the user's console.

Usage

wrap_str(..., sep = "")

cat_wrap(..., brk = "")

warn_wrap(..., brk = "\n", class = NULL, call. = FALSE)

stop_wrap(
  ...,
  brk = "\n",
  trace = rlang::trace_back(bottom = rlang::caller_env()),
  class = NULL,
  call = rlang::caller_env(),
  call. = FALSE
)

msg_wrap(..., class = NULL, brk = "\n")

Arguments

...

Objects to print. For stop_wrap(), warn_wrap(), and msg_wrap(), any named objects are instead diverted to the ... argument of rlang::abort(), rlang::warn(), and rlang::inform(), respectively.

sep

Separator between ..., Default: ”

brk

What should the last character of the message/warning/error be? Default is "\n", meaning the console output ends with a new line.

class

Subclass of the condition.

call.

Here for legacy reasons. It is ignored.

trace

A trace object created by trace_back().

call

The actual calling environment to report in the error message. By default, rlang::caller_env().

Details

The point of these functions is to allow you to print output/messages/warnings/errors to the console without having to figure out where to place newline characters. These functions get the width of the console from the "width" option, which in most editors adjusts dynamically as you resize.

So instead of writing a warning like this:

warning("I have to give you this very important message that may be too\n",
        "wide for your screen")

You can do it like this:

warn_wrap("I have to give you this very important message that may be
          too wide for your screen")

And the function will automatically insert line breaks to fit the console. As a note, it will also ignore any newlines you insert. This means you can make your own fit your editor's screen and indent in the middle of a string without that formatting being carried over into the output.