Bookdata-tools/src/tsv.rs

pub fn split_first<'a>(line: &'a str) -> Option<(&'a str, &'a str)> {
  match line.find('\t') {
    Some(i) => Some((&line[0..i], &line[(i+1)..])),
    None => None
  }
}

#[test]
fn split_empty() {
  assert_eq!(split_first(""), None)
}

#[test]
fn split_tab() {
  assert_eq!(split_first("foo\tbar"), Some(("foo", "bar")))
}

#[test]
fn split_end() {
  assert_eq!(split_first("foo\t"), Some(("foo", "")))
}

#[test]
fn split_2() {
  assert_eq!(split_first("foo\tbar\tblatz"), Some(("foo", "bar\tblatz")))
}