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askYesNo provides a standard way to ask the user a yes/no question. It provides a way for front-ends to substitute their own dialogs.

Keywords
utilities
##### Usage
askYesNo(msg, default = TRUE,
prompts = getOption("askYesNo", gettext(c("Yes", "No", "Cancel"))),
...)
##### Arguments
msg

The prompt message for the user.

default

The default response.

prompts

Any of: a character vector containing 3 prompts corresponding to return values of TRUE, FALSE, or NA, or a single character value containing the prompts separated by / characters, or a function to call.

Additional parameters, ignored by the default function.

##### Details

askYesNo will accept case-independent partial matches to the prompts. If no response is given the value of default will be returned; if a non-empty string that doesn't match any of the prompts is entered, an error will be raised.

If a function or single character string naming a function is given for prompts, it will be called as fn(msg = msg, default = default, prompts = prompts, ...). On Windows, the GUI uses the unexported utils:::askYesNoWinDialog function for this purpose.

If strings (or a string such as "Y/N/C") are given as prompts, the choices will be mapped to lowercase for the non-default choices, and left as-is for the default choice.

##### Value

TRUE for yes, FALSE for no, and NA for cancel.

readline for more general user input.
library(utils) # NOT RUN { if (interactive()) askYesNo("Do you want to use askYesNo?") # }