Capture output to console

Evaluates code in a special context in which all output is captured, similar to capture.output().

capture_output(code, print = FALSE, width = 80)

capture_output_lines(code, print = FALSE, width = 80)

Arguments

code	Code to evaluate.
print	If TRUE and the result of evaluating code is visible this will print the result, ensuring that the output of printing the object is included in the overall output
width	Number of characters per line of output. This does not inherit from getOption("width") so that tests always use the same output width, minimising spurious differences.

Value

capture_output() returns a single string. capture_output_lines() returns a character vector with one entry for each line

Examples

capture_output({
  cat("Hi!\n")
  cat("Bye\n")
})
#> [1] "Hi!\nBye"

capture_output_lines({
  cat("Hi!\n")
  cat("Bye\n")
})
#> [1] "Hi!" "Bye"

capture_output("Hi")
#> [1] ""
capture_output("Hi", print = TRUE)
#> [1] "[1] \"Hi\""