Check readline input

Check readline input

readline_check(prompt, type = c("numeric", "integer", "length", "grep"),
  min = -Inf, max = Inf, warning = NULL, ...)

Arguments

prompt	the prompt for readline
type	what type of check to perform, one of c("numeric", "integer", "length", "grep")
min	the minimum value
max	the maximum value
warning	an optional custom warning message
...	other arguments to pass to grep

Value

the validated result of readline

Examples

if (FALSE) {
readline_check("Type a number: ", "numeric")
readline_check("Type two characters: ", "length", min = 2, max = 2)
readline_check("Type at least 3 characters: ", "length", min = 3)
readline_check("Type no more than 4 characters: ", "length", max = 44)
readline_check("Type a letter and a number: ", "grep", pattern = "^[a-zA-Z]\\d$")
}