X-Git-Url: http://git.scottworley.com/tablify/blobdiff_plain/75bb888a36b5fdc005a0661c964779d6e0277298..4df06f73234edadfd1203ce9d12b44b0d7948947:/src/lib.rs?ds=inline diff --git a/src/lib.rs b/src/lib.rs index 0e2007d..efdb7d8 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -1,37 +1,439 @@ -#[cfg(test)] +use std::collections::{HashMap, HashSet}; +use std::fmt::Write; +use std::io::BufRead; use std::iter::Iterator; +const HEADER: &str = " + + + + + + + + + + +"; +const FOOTER: &str = " +
+ +"; + +#[derive(Debug, PartialEq, Eq, Hash)] +struct Entry { + col: String, + instance: Option, +} +impl From<&str> for Entry { + fn from(value: &str) -> Entry { + match value.split_once(':') { + None => Entry { + col: String::from(value), + instance: None, + }, + Some((col, instance)) => Entry { + col: String::from(col.trim()), + instance: Some(String::from(instance.trim())), + }, + } + } +} + #[derive(Debug, PartialEq, Eq)] struct RowInput { label: String, - entries: Vec, + entries: Vec, } -#[cfg(test)] -fn read_rows(_input: &impl std::io::Read) -> impl Iterator { - vec![RowInput { - label: String::from("foo"), - entries: vec![], - }] - .into_iter() +struct Reader>> { + input: std::iter::Enumerate, + row: Option, +} +impl>> Reader { + fn new(input: Input) -> Self { + Self { + input: input.enumerate(), + row: None, + } + } +} +impl>> Iterator for Reader { + type Item = Result; + fn next(&mut self) -> Option { + loop { + match self + .input + .next() + .map(|(n, r)| (n, r.map(|line| String::from(line.trim_end())))) + { + None => return Ok(std::mem::take(&mut self.row)).transpose(), + Some((_, Err(e))) => return Some(Err(e)), + Some((_, Ok(line))) if line.is_empty() && self.row.is_some() => { + return Ok(std::mem::take(&mut self.row)).transpose() + } + Some((_, Ok(line))) if line.is_empty() => {} + Some((n, Ok(line))) if line.starts_with(' ') => match &mut self.row { + None => { + return Some(Err(std::io::Error::other(format!( + "{}: Entry with no header", + n + 1 + )))) + } + Some(ref mut row) => row.entries.push(Entry::from(line.trim())), + }, + Some((_, Ok(line))) => { + let prev = std::mem::take(&mut self.row); + self.row = Some(RowInput { + label: line, + entries: vec![], + }); + if prev.is_some() { + return Ok(prev).transpose(); + } + } + } + } + } +} + +fn read_rows(input: impl std::io::Read) -> impl Iterator> { + Reader::new(std::io::BufReader::new(input).lines()) +} + +fn column_counts(rows: &[RowInput]) -> Vec<(usize, String)> { + let mut counts: Vec<_> = rows + .iter() + .flat_map(|r| { + r.entries + .iter() + .map(|e| &e.col) + .collect::>() + .into_iter() + }) + .fold(HashMap::new(), |mut cs, col| { + cs.entry(String::from(col)) + .and_modify(|n| *n += 1) + .or_insert(1); + cs + }) + .into_iter() + .map(|(col, n)| (n, col)) + .collect(); + counts.sort(); + counts +} +fn column_order(rows: &[RowInput]) -> Vec { + column_counts(rows) + .into_iter() + .map(|(_, col)| col) + .collect() +} + +fn render_instance(entry: &Entry) -> String { + match &entry.instance { + None => String::from("✓ "), + Some(instance) => String::from(instance) + " ", + } +} + +fn render_cell(col: &str, row: &RowInput) -> String { + // TODO: Escape HTML special characters + let row_label = &row.label; + let entries: Vec<&Entry> = row.entries.iter().filter(|e| e.col == col).collect(); + let class = if entries.is_empty() { "" } else { "yes" }; + let all_empty = entries.iter().all(|e| e.instance.is_none()); + let contents = if entries.is_empty() || (all_empty && entries.len() == 1) { + String::new() + } else if all_empty { + format!("{}", entries.len()) + } else { + entries + .iter() + .map(|i| render_instance(i)) + .collect::() + }; + format!("{}", contents.trim()) +} + +fn render_row(columns: &[String], row: &RowInput) -> String { + // This is O(n^2) & doesn't need to be + // TODO: Escape HTML special characters + let row_label = &row.label; + format!( + "{row_label}{}\n", + &columns + .iter() + .map(|col| render_cell(col, row)) + .collect::() + ) +} + +fn render_column_headers(columns: &[String]) -> String { + // TODO: Escape HTML special characters + String::from("") + + &columns.iter().fold(String::new(), |mut acc, c| { + write!(&mut acc, "
{c}
").unwrap(); + acc + }) + + "\n" } -pub fn tablify(_input: &impl std::io::Read) -> String { - String::from("Hello, world!") +/// # 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 { + let rows = read_rows(input).collect::, _>>()?; + let columns = column_order(&rows); + Ok(String::from(HEADER) + + &render_column_headers(&columns) + + &rows + .into_iter() + .map(|r| render_row(&columns, &r)) + .collect::() + + FOOTER) } #[cfg(test)] mod tests { use super::*; + #[test] + fn test_parse_entry() { + assert_eq!( + Entry::from("foo"), + Entry { + col: String::from("foo"), + instance: None + } + ); + assert_eq!( + Entry::from("foo:bar"), + Entry { + col: String::from("foo"), + instance: Some(String::from("bar")) + } + ); + assert_eq!( + Entry::from("foo: bar"), + Entry { + col: String::from("foo"), + instance: Some(String::from("bar")) + } + ); + } + #[test] fn test_read_rows() { assert_eq!( - read_rows(&&b"foo"[..]).collect::>(), + read_rows(&b"foo"[..]).flatten().collect::>(), vec![RowInput { label: String::from("foo"), entries: vec![] }] ); + assert_eq!( + read_rows(&b"bar"[..]).flatten().collect::>(), + vec![RowInput { + label: String::from("bar"), + entries: vec![] + }] + ); + assert_eq!( + read_rows(&b"foo\nbar\n"[..]).flatten().collect::>(), + vec![ + RowInput { + label: String::from("foo"), + entries: vec![] + }, + RowInput { + label: String::from("bar"), + entries: vec![] + } + ] + ); + assert_eq!( + read_rows(&b"foo\n bar\n"[..]).flatten().collect::>(), + vec![RowInput { + label: String::from("foo"), + entries: vec![Entry::from("bar")] + }] + ); + assert_eq!( + read_rows(&b"foo\n bar\n baz\n"[..]) + .flatten() + .collect::>(), + vec![RowInput { + label: String::from("foo"), + entries: vec![Entry::from("bar"), Entry::from("baz")] + }] + ); + assert_eq!( + read_rows(&b"foo\n\nbar\n"[..]) + .flatten() + .collect::>(), + vec![ + RowInput { + label: String::from("foo"), + entries: vec![] + }, + RowInput { + label: String::from("bar"), + entries: vec![] + } + ] + ); + assert_eq!( + read_rows(&b"foo\n \nbar\n"[..]) + .flatten() + .collect::>(), + vec![ + RowInput { + label: String::from("foo"), + entries: vec![] + }, + RowInput { + label: String::from("bar"), + entries: vec![] + } + ] + ); + assert_eq!( + read_rows(&b"foo \n bar \n"[..]) + .flatten() + .collect::>(), + vec![RowInput { + label: String::from("foo"), + entries: vec![Entry::from("bar")] + }] + ); + + let bad = read_rows(&b" foo"[..]).next().unwrap(); + assert!(bad.is_err()); + assert!(format!("{bad:?}").contains("1: Entry with no header")); + + let bad2 = read_rows(&b"foo\n\n bar"[..]).nth(1).unwrap(); + assert!(bad2.is_err()); + assert!(format!("{bad2:?}").contains("3: Entry with no header")); + } + + #[test] + fn test_column_counts() { + assert_eq!( + column_counts( + &read_rows(&b"foo\n bar\n baz\n"[..]) + .collect::, _>>() + .unwrap() + ), + vec![(1, String::from("bar")), (1, String::from("baz"))] + ); + assert_eq!( + column_counts( + &read_rows(&b"foo\n bar\n baz\nquux\n baz"[..]) + .collect::, _>>() + .unwrap() + ), + vec![(1, String::from("bar")), (2, String::from("baz"))] + ); + assert_eq!( + column_counts( + &read_rows(&b"foo\n bar\n bar\n baz\n bar\nquux\n baz"[..]) + .collect::, _>>() + .unwrap() + ), + vec![(1, String::from("bar")), (2, String::from("baz"))] + ); + assert_eq!( + column_counts( + &read_rows(&b"foo\n bar: 1\n bar: 2\n baz\n bar\nquux\n baz"[..]) + .collect::, _>>() + .unwrap() + ), + vec![(1, String::from("bar")), (2, String::from("baz"))] + ); + } + + #[test] + fn test_render_cell() { + assert_eq!( + render_cell( + "foo", + &RowInput { + label: String::from("nope"), + entries: vec![] + } + ), + String::from("") + ); + assert_eq!( + render_cell( + "foo", + &RowInput { + label: String::from("nope"), + entries: vec![Entry::from("bar")] + } + ), + String::from("") + ); + assert_eq!( + render_cell( + "foo", + &RowInput { + label: String::from("nope"), + entries: vec![Entry::from("foo")] + } + ), + String::from("") + ); + assert_eq!( + render_cell( + "foo", + &RowInput { + label: String::from("nope"), + entries: vec![Entry::from("foo"), Entry::from("foo")] + } + ), + String::from("2") + ); + assert_eq!( + render_cell( + "foo", + &RowInput { + label: String::from("nope"), + entries: vec![Entry::from("foo: 5"), Entry::from("foo: 10")] + } + ), + String::from("5 10") + ); + assert_eq!( + render_cell( + "foo", + &RowInput { + label: String::from("nope"), + entries: vec![Entry::from("foo: 5"), Entry::from("foo")] + } + ), + String::from("5 ✓") + ); } }