Function promptly::prompt_opt

pub fn prompt_opt<T, S>(msg: S) -> Result<Option<T>, ReadlineError> where
    T: Promptable,
    S: AsRef<str>, 

Prompt until input can be parsed as T, returning None for empty input.

Empty string input results in None

Examples

use promptly::prompt_opt;

// Prompt for an optional string
let name: Option<String> = prompt_opt("Enter your name (optional)")?;

// Prompt for optional paths with path completion. Returns `None` if empty input.
let photo: Option<PathBuf> = prompt_opt("Enter a path to a profile picture")?;

Errors

Returns a ReadlineError if readline fails. Input that can’t be coerced into the specified type results in re-prompting.