git-snip 0.2.0

Snip local Git branches that do not exist on the remote.
Documentation 
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use std::io::{self, BufRead, Write};

/// Prints a prompt and reads a line of input.
fn prompt<R>(prompt_text: &str, mut reader: R) -> String
where
    R: BufRead,
{
    print!("{}", prompt_text);
    io::stdout().flush().expect("Failed to flush stdout.");
    let mut input = String::new();
    reader.read_line(&mut input).expect("Failed to read input.");
    input.trim().to_lowercase()
}

/// Prints a prompt and reads a line of input from stdin.
pub fn prompt_stdin(prompt_text: &str) -> String {
    prompt(prompt_text, io::stdin().lock())
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_prompt() {
        // GIVEN a prompt with expected text
        let prompt_text = "Enter some text: ";
        let expected = "hello";
        let reader = std::io::Cursor::new(format!("{}\n", expected));

        // WHEN the user enters text
        let actual = prompt(prompt_text, reader);

        // THEN it should match the expected one
        assert_eq!(actual, expected);
    }
}