-pub fn tablify(_input: &impl std::io::Read) -> String {
- String::from("Hello, world!")
+fn column_counts(rows: &[RowInput]) -> Vec<(usize, String)> {
+ let mut counts: Vec<_> = rows
+ .iter()
+ .flat_map(|r| r.entries.iter().collect::<HashSet<_>>().into_iter())
+ .fold(HashMap::new(), |mut cs, e| {
+ cs.entry(String::from(e))
+ .and_modify(|n| *n += 1)
+ .or_insert(1);
+ cs
+ })
+ .into_iter()
+ .map(|(col, n)| (n, col))
+ .collect();
+ counts.sort();
+ counts
+}
+
+/// # Errors
+///
+/// Will return `Err` if
+/// * there's an i/o error while reading `input`
+/// * the log has invalid syntax:
+/// * an indented line with no preceding non-indented line
+pub fn tablify(input: impl std::io::Read) -> Result<String, std::io::Error> {
+ let rows = read_rows(input).collect::<Result<Vec<_>, _>>()?;
+ let _columns = column_counts(&rows);
+ Ok(String::from("Hello, world!"))