use bstr::{BStr, BString, ByteSlice, ByteVec};

/// Transforms the given `value` to be suitable for use as an argument for Bourne shells by wrapping it into single quotes.
///
/// Every single-quote `'` is escaped with `\'`, every exclamation mark `!` is escaped with `\!`, and the entire string is enclosed
/// in single quotes.
pub fn single(mut value: &BStr) -> BString {
    let mut quoted = BString::new(b"'".to_vec());

    while let Some(pos) = value.find_byteset(b"'!") {
        quoted.extend_from_slice(&value[..pos]);
        quoted.push_str(b"'\\");
        quoted.push(value[pos]);
        quoted.push(b'\'');

        value = &value[pos + 1..];
    }

    quoted.extend_from_slice(value);
    quoted.push(b'\'');
    quoted
}