git.scottworley.com Git - tablify/blame_incremental - src/lib.rs

use std::borrow::ToOwned;
use std::collections::HashMap;
use std::fmt::Write;
use std::io::BufRead;
use std::iter::Iterator;

const HEADER: &str = "<!DOCTYPE html>
<html>
<head>
  <meta charset=\"utf-8\">
  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
  <style>
    td { text-align: center; }
    /* h/t https://wabain.github.io/2019/10/13/css-rotated-table-header.html */
    th, td { white-space: nowrap; }
    th { text-align: left; font-weight: normal; }
    table { border-collapse: collapse }
    tr.key > th { height: 10em; vertical-align: bottom; line-height: 1 }
    tr.key > th > div { width: 1em; }
    tr.key > th > div > div { width: 5em; transform-origin: bottom left; transform: translateX(1em) rotate(-65deg) }
    td { border: thin solid gray; }
    td.yes { border: thin solid gray; background-color: #ddd; }
    /* h/t https://stackoverflow.com/questions/5687035/css-bolding-some-text-without-changing-its-containers-size/46452396#46452396 */
    .highlight { text-shadow: -0.06ex 0 black, 0.06ex 0 black; }
  </style>
  <script>
    function highlight(id)       { const e = document.getElementById(id); if (e) { e.classList.add(   \"highlight\"); } }
    function clear_highlight(id) { const e = document.getElementById(id); if (e) { e.classList.remove(\"highlight\"); } }
    function h2(a, b)  {       highlight(a);       highlight(b); }
    function ch2(a, b) { clear_highlight(a); clear_highlight(b); }
  </script>
</head>
<body>
  <table>
    <tbody>
";
const FOOTER: &str = "    </tbody>
  </table>
</body>
</html>";

#[derive(PartialEq, Eq, Debug)]
pub struct HTML(String);
impl HTML {
    fn escape(value: &str) -> HTML {
        let mut escaped: String = String::new();
        for c in value.chars() {
            match c {
                '>' => escaped.push_str("&gt;"),
                '<' => escaped.push_str("&lt;"),
                '\'' => escaped.push_str("&#39;"),
                '"' => escaped.push_str("&quot;"),
                '&' => escaped.push_str("&amp;"),
                ok_c => escaped.push(ok_c),
            }
        }
        HTML(escaped)
    }
}
impl From<&str> for HTML {
    fn from(value: &str) -> HTML {
        HTML(String::from(value))
    }
}
impl FromIterator<HTML> for HTML {
    fn from_iter<T>(iter: T) -> HTML
    where
        T: IntoIterator<Item = HTML>,
    {
        HTML(iter.into_iter().map(|html| html.0).collect::<String>())
    }
}
impl std::fmt::Display for HTML {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}

#[derive(Debug, PartialEq, Eq)]
enum InputLine<'a> {
    Blank,
    RowHeader(&'a str),
    Entry(&'a str, Option<&'a str>),
}
impl<'a> From<&'a str> for InputLine<'a> {
    fn from(value: &'a str) -> InputLine<'a> {
        let trimmed = value.trim_end();
        if trimmed.is_empty() {
            InputLine::Blank
        } else if !trimmed.starts_with(' ') {
            InputLine::RowHeader(value.trim())
        } else {
            match value.split_once(':') {
                None => InputLine::Entry(value.trim(), None),
                Some((col, instance)) => InputLine::Entry(col.trim(), Some(instance.trim())),
            }
        }
    }
}

#[derive(Debug, PartialEq, Eq)]
struct Row {
    label: String,
    entries: HashMap<String, Vec<Option<String>>>,
}

struct Reader<Input: Iterator<Item = Result<String, std::io::Error>>> {
    input: std::iter::Enumerate<Input>,
    row: Option<Row>,
}
impl<Input: Iterator<Item = Result<String, std::io::Error>>> Reader<Input> {
    fn new(input: Input) -> Self {
        Self {
            input: input.enumerate(),
            row: None,
        }
    }
}
impl<Input: Iterator<Item = Result<String, std::io::Error>>> Iterator for Reader<Input> {
    type Item = Result<Row, std::io::Error>;
    fn next(&mut self) -> Option<Self::Item> {
        loop {
            match self.input.next() {
                None => return Ok(std::mem::take(&mut self.row)).transpose(),
                Some((_, Err(e))) => return Some(Err(e)),
                Some((n, Ok(line))) => match InputLine::from(line.as_ref()) {
                    InputLine::Blank if self.row.is_some() => {
                        return Ok(std::mem::take(&mut self.row)).transpose()
                    }
                    InputLine::Blank => {}
                    InputLine::Entry(col, instance) => 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
                                .entry(col.to_owned())
                                .and_modify(|is| is.push(instance.map(ToOwned::to_owned)))
                                .or_insert_with(|| vec![instance.map(ToOwned::to_owned)]);
                        }
                    },
                    InputLine::RowHeader(row) => {
                        let prev = std::mem::take(&mut self.row);
                        self.row = Some(Row {
                            label: row.to_owned(),
                            entries: HashMap::new(),
                        });
                        if prev.is_some() {
                            return Ok(prev).transpose();
                        }
                    }
                },
            }
        }
    }
}

fn read_rows(input: impl std::io::Read) -> impl Iterator<Item = Result<Row, std::io::Error>> {
    Reader::new(std::io::BufReader::new(input).lines())
}

fn column_counts(rows: &[Row]) -> Vec<(usize, String)> {
    let mut counts: Vec<_> = rows
        .iter()
        .flat_map(|r| r.entries.keys())
        .fold(HashMap::new(), |mut cs, col| {
            cs.entry(col.to_owned())
                .and_modify(|n| *n += 1)
                .or_insert(1);
            cs
        })
        .into_iter()
        .map(|(col, n)| (n, col))
        .collect();
    counts.sort_unstable_by(|(an, acol), (bn, bcol)| bn.cmp(an).then(acol.cmp(bcol)));
    counts
}
fn column_order(rows: &[Row]) -> Vec<String> {
    column_counts(rows)
        .into_iter()
        .map(|(_, col)| col)
        .collect()
}

fn render_instance(instance: &Option<String>) -> HTML {
    match instance {
        None => HTML::from("✓"),
        Some(instance) => HTML::escape(instance.as_ref()),
    }
}

fn render_cell(col: &str, row: &Row) -> HTML {
    let row_label = HTML::escape(row.label.as_ref());
    let col_label = HTML::escape(col);
    let instances: Option<&Vec<Option<String>>> = row.entries.get(col);
    let class = HTML::from(if instances.is_none() { "" } else { "yes" });
    let all_empty = instances
        .iter()
        .flat_map(|is| is.iter())
        .all(Option::is_none);
    let contents = if instances.is_none() || (all_empty && instances.unwrap().len() == 1) {
        HTML::from("")
    } else if all_empty {
        HTML(format!("{}", instances.unwrap().len()))
    } else {
        HTML(
            instances
                .unwrap()
                .iter()
                .map(render_instance)
                .map(|html| html.0) // Waiting for slice_concat_trait to stabilize
                .collect::<Vec<_>>()
                .join(" "),
        )
    };
    HTML(format!("<td class=\"{class}\" onmouseover=\"h2('{row_label}','{col_label}')\" onmouseout=\"ch2('{row_label}','{col_label}')\">{contents}</td>"))
}

fn render_row(columns: &[String], row: &Row) -> HTML {
    let row_label = HTML::escape(row.label.as_ref());
    HTML(format!(
        "<tr><th id=\"{row_label}\">{row_label}</th>{}</tr>\n",
        &columns
            .iter()
            .map(|col| render_cell(col, row))
            .collect::<HTML>()
    ))
}

fn render_column_headers(columns: &[String]) -> HTML {
    HTML(
        String::from("<tr class=\"key\"><th></th>")
            + &columns.iter().fold(String::new(), |mut acc, col| {
                let col_header = HTML::escape(col.as_ref());
                write!(
                    &mut acc,
                    "<th id=\"{col_header}\"><div><div>{col_header}</div></div></th>"
                )
                .unwrap();
                acc
            })
            + "</tr>\n",
    )
}

/// # 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<HTML, std::io::Error> {
    let rows = read_rows(input).collect::<Result<Vec<_>, _>>()?;
    let columns = column_order(&rows);
    Ok(HTML(format!(
        "{HEADER}{}{}{FOOTER}",
        render_column_headers(&columns),
        rows.into_iter()
            .map(|r| render_row(&columns, &r))
            .collect::<HTML>()
    )))
}

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

    #[test]
    fn test_parse_line() {
        assert_eq!(InputLine::from(""), InputLine::Blank);
        assert_eq!(InputLine::from(" "), InputLine::Blank);
        assert_eq!(InputLine::from("foo"), InputLine::RowHeader("foo"));
        assert_eq!(InputLine::from("foo "), InputLine::RowHeader("foo"));
        assert_eq!(InputLine::from(" foo"), InputLine::Entry("foo", None));
        assert_eq!(
            InputLine::from(" foo:bar"),
            InputLine::Entry("foo", Some("bar"))
        );
        assert_eq!(
            InputLine::from(" foo: bar"),
            InputLine::Entry("foo", Some("bar"))
        );
        assert_eq!(
            InputLine::from(" foo: bar "),
            InputLine::Entry("foo", Some("bar"))
        );
        assert_eq!(
            InputLine::from(" foo:  bar "),
            InputLine::Entry("foo", Some("bar"))
        );
        assert_eq!(
            InputLine::from(" foo :  bar "),
            InputLine::Entry("foo", Some("bar"))
        );
    }

    #[test]
    fn test_read_rows() {
        assert_eq!(
            read_rows(&b"foo"[..]).flatten().collect::<Vec<_>>(),
            vec![Row {
                label: "foo".to_owned(),
                entries: HashMap::new(),
            }]
        );
        assert_eq!(
            read_rows(&b"bar"[..]).flatten().collect::<Vec<_>>(),
            vec![Row {
                label: "bar".to_owned(),
                entries: HashMap::new(),
            }]
        );
        assert_eq!(
            read_rows(&b"foo\nbar\n"[..]).flatten().collect::<Vec<_>>(),
            vec![
                Row {
                    label: "foo".to_owned(),
                    entries: HashMap::new(),
                },
                Row {
                    label: "bar".to_owned(),
                    entries: HashMap::new(),
                }
            ]
        );
        assert_eq!(
            read_rows(&b"foo\n bar\n"[..]).flatten().collect::<Vec<_>>(),
            vec![Row {
                label: "foo".to_owned(),
                entries: HashMap::from([("bar".to_owned(), vec![None])]),
            }]
        );
        assert_eq!(
            read_rows(&b"foo\n bar\n baz\n"[..])
                .flatten()
                .collect::<Vec<_>>(),
            vec![Row {
                label: "foo".to_owned(),
                entries: HashMap::from([
                    ("bar".to_owned(), vec![None]),
                    ("baz".to_owned(), vec![None])
                ]),
            }]
        );
        assert_eq!(
            read_rows(&b"foo\n\nbar\n"[..])
                .flatten()
                .collect::<Vec<_>>(),
            vec![
                Row {
                    label: "foo".to_owned(),
                    entries: HashMap::new(),
                },
                Row {
                    label: "bar".to_owned(),
                    entries: HashMap::new(),
                }
            ]
        );
        assert_eq!(
            read_rows(&b"foo\n \nbar\n"[..])
                .flatten()
                .collect::<Vec<_>>(),
            vec![
                Row {
                    label: "foo".to_owned(),
                    entries: HashMap::new(),
                },
                Row {
                    label: "bar".to_owned(),
                    entries: HashMap::new(),
                }
            ]
        );
        assert_eq!(
            read_rows(&b"foo  \n bar  \n"[..])
                .flatten()
                .collect::<Vec<_>>(),
            vec![Row {
                label: "foo".to_owned(),
                entries: HashMap::from([("bar".to_owned(), vec![None])]),
            }]
        );

        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::<Result<Vec<_>, _>>()
                    .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::<Result<Vec<_>, _>>()
                    .unwrap()
            ),
            vec![(2, String::from("baz")), (1, String::from("bar"))]
        );
        assert_eq!(
            column_counts(
                &read_rows(&b"foo\n bar\n bar\n baz\n bar\nquux\n baz"[..])
                    .collect::<Result<Vec<_>, _>>()
                    .unwrap()
            ),
            vec![(2, String::from("baz")), (1, String::from("bar"))]
        );
        assert_eq!(
            column_counts(
                &read_rows(&b"foo\n bar: 1\n bar: 2\n baz\n bar\nquux\n baz"[..])
                    .collect::<Result<Vec<_>, _>>()
                    .unwrap()
            ),
            vec![(2, String::from("baz")), (1, String::from("bar"))]
        );
    }

    #[test]
    fn test_render_cell() {
        assert_eq!(
            render_cell(
                "foo",
                &Row {
                    label: "nope".to_owned(),
                    entries: HashMap::new(),
                }
            ),
            HTML::from("<td class=\"\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\"></td>")
        );
        assert_eq!(
            render_cell(
                "foo",
                &Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("bar".to_owned(), vec![None])]),
                }
            ),
            HTML::from("<td class=\"\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\"></td>")
        );
        assert_eq!(
            render_cell(
                "foo",
                &Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("foo".to_owned(), vec![None])]),
                }
            ),
            HTML::from("<td class=\"yes\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\"></td>")
        );
        assert_eq!(
            render_cell(
                "foo",
                &Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("foo".to_owned(), vec![None, None])]),
                }
            ),
            HTML::from("<td class=\"yes\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\">2</td>")
        );
        assert_eq!(
            render_cell(
                "foo",
                &Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("foo".to_owned(), vec![Some("5".to_owned()), Some("10".to_owned())])]),
                }
            ),
            HTML::from("<td class=\"yes\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\">5 10</td>")
        );
        assert_eq!(
            render_cell(
                "foo",
                &Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("foo".to_owned(), vec![Some("5".to_owned()), None])]),
                }
            ),
            HTML::from("<td class=\"yes\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\">5 ✓</td>")
        );
        assert_eq!(
            render_cell(
                "heart",
                &Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("heart".to_owned(), vec![Some("<3".to_owned())])]),
                }
            ),
            HTML::from("<td class=\"yes\" onmouseover=\"h2('nope','heart')\" onmouseout=\"ch2('nope','heart')\">&lt;3</td>")
        );
        assert_eq!(
            render_cell(
                "foo",
                &Row {
                    label: "bob's".to_owned(),
                    entries: HashMap::from([("foo".to_owned(), vec![None])]),
                }
            ),
            HTML::from("<td class=\"yes\" onmouseover=\"h2('bob&#39;s','foo')\" onmouseout=\"ch2('bob&#39;s','foo')\"></td>")
        );
    }
}
Commit	Line	Data
	1	use std::borrow::ToOwned;
	2	use std::collections::HashMap;
	3	use std::fmt::Write;
	4	use std::io::BufRead;
	5	use std::iter::Iterator;
	6
	7	const HEADER: &str = "<!DOCTYPE html>
	8	<html>
	9	<head>
	10	<meta charset=\"utf-8\">
	11	<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
	12	<style>
	13	td { text-align: center; }
	14	/* h/t https://wabain.github.io/2019/10/13/css-rotated-table-header.html */
	15	th, td { white-space: nowrap; }
	16	th { text-align: left; font-weight: normal; }
	17	table { border-collapse: collapse }
	18	tr.key > th { height: 10em; vertical-align: bottom; line-height: 1 }
	19	tr.key > th > div { width: 1em; }
	20	tr.key > th > div > div { width: 5em; transform-origin: bottom left; transform: translateX(1em) rotate(-65deg) }
	21	td { border: thin solid gray; }
	22	td.yes { border: thin solid gray; background-color: #ddd; }
	23	/* h/t https://stackoverflow.com/questions/5687035/css-bolding-some-text-without-changing-its-containers-size/46452396#46452396 */
	24	.highlight { text-shadow: -0.06ex 0 black, 0.06ex 0 black; }
	25	</style>
	26	<script>
	27	function highlight(id) { const e = document.getElementById(id); if (e) { e.classList.add( \"highlight\"); } }
	28	function clear_highlight(id) { const e = document.getElementById(id); if (e) { e.classList.remove(\"highlight\"); } }
	29	function h2(a, b) { highlight(a); highlight(b); }
	30	function ch2(a, b) { clear_highlight(a); clear_highlight(b); }
	31	</script>
	32	</head>
	33	<body>
	34	<table>
	35	<tbody>
	36	";
	37	const FOOTER: &str = " </tbody>
	38	</table>
	39	</body>
	40	</html>";
	41
	42	#[derive(PartialEq, Eq, Debug)]
	43	pub struct HTML(String);
	44	impl HTML {
	45	fn escape(value: &str) -> HTML {
	46	let mut escaped: String = String::new();
	47	for c in value.chars() {
	48	match c {
	49	'>' => escaped.push_str(">"),
	50	'<' => escaped.push_str("<"),
	51	'\'' => escaped.push_str("'"),
	52	'"' => escaped.push_str("""),
	53	'&' => escaped.push_str("&"),
	54	ok_c => escaped.push(ok_c),
	55	}
	56	}
	57	HTML(escaped)
	58	}
	59	}
	60	impl From<&str> for HTML {
	61	fn from(value: &str) -> HTML {
	62	HTML(String::from(value))
	63	}
	64	}
	65	impl FromIterator<HTML> for HTML {
	66	fn from_iter<T>(iter: T) -> HTML
	67	where
	68	T: IntoIterator<Item = HTML>,
	69	{
	70	HTML(iter.into_iter().map(\|html\| html.0).collect::<String>())
	71	}
	72	}
	73	impl std::fmt::Display for HTML {
	74	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
	75	write!(f, "{}", self.0)
	76	}
	77	}
	78
	79	#[derive(Debug, PartialEq, Eq)]
	80	enum InputLine<'a> {
	81	Blank,
	82	RowHeader(&'a str),
	83	Entry(&'a str, Option<&'a str>),
	84	}
	85	impl<'a> From<&'a str> for InputLine<'a> {
	86	fn from(value: &'a str) -> InputLine<'a> {
	87	let trimmed = value.trim_end();
	88	if trimmed.is_empty() {
	89	InputLine::Blank
	90	} else if !trimmed.starts_with(' ') {
	91	InputLine::RowHeader(value.trim())
	92	} else {
	93	match value.split_once(':') {
	94	None => InputLine::Entry(value.trim(), None),
	95	Some((col, instance)) => InputLine::Entry(col.trim(), Some(instance.trim())),
	96	}
	97	}
	98	}
	99	}
	100
	101	#[derive(Debug, PartialEq, Eq)]
	102	struct Row {
	103	label: String,
	104	entries: HashMap<String, Vec<Option<String>>>,
	105	}
	106
	107	struct Reader<Input: Iterator<Item = Result<String, std::io::Error>>> {
	108	input: std::iter::Enumerate<Input>,
	109	row: Option<Row>,
	110	}
	111	impl<Input: Iterator<Item = Result<String, std::io::Error>>> Reader<Input> {
	112	fn new(input: Input) -> Self {
	113	Self {
	114	input: input.enumerate(),
	115	row: None,
	116	}
	117	}
	118	}
	119	impl<Input: Iterator<Item = Result<String, std::io::Error>>> Iterator for Reader<Input> {
	120	type Item = Result<Row, std::io::Error>;
	121	fn next(&mut self) -> Option<Self::Item> {
	122	loop {
	123	match self.input.next() {
	124	None => return Ok(std::mem::take(&mut self.row)).transpose(),
	125	Some((_, Err(e))) => return Some(Err(e)),
	126	Some((n, Ok(line))) => match InputLine::from(line.as_ref()) {
	127	InputLine::Blank if self.row.is_some() => {
	128	return Ok(std::mem::take(&mut self.row)).transpose()
	129	}
	130	InputLine::Blank => {}
	131	InputLine::Entry(col, instance) => match &mut self.row {
	132	None => {
	133	return Some(Err(std::io::Error::other(format!(
	134	"{}: Entry with no header",
	135	n + 1
	136	))))
	137	}
	138	Some(ref mut row) => {
	139	row.entries
	140	.entry(col.to_owned())
	141	.and_modify(\|is\| is.push(instance.map(ToOwned::to_owned)))
	142	.or_insert_with(\|\| vec![instance.map(ToOwned::to_owned)]);
	143	}
	144	},
	145	InputLine::RowHeader(row) => {
	146	let prev = std::mem::take(&mut self.row);
	147	self.row = Some(Row {
	148	label: row.to_owned(),
	149	entries: HashMap::new(),
	150	});
	151	if prev.is_some() {
	152	return Ok(prev).transpose();
	153	}
	154	}
	155	},
	156	}
	157	}
	158	}
	159	}
	160
	161	fn read_rows(input: impl std::io::Read) -> impl Iterator<Item = Result<Row, std::io::Error>> {
	162	Reader::new(std::io::BufReader::new(input).lines())
	163	}
	164
	165	fn column_counts(rows: &[Row]) -> Vec<(usize, String)> {
	166	let mut counts: Vec<_> = rows
	167	.iter()
	168	.flat_map(\|r\| r.entries.keys())
	169	.fold(HashMap::new(), \|mut cs, col\| {
	170	cs.entry(col.to_owned())
	171	.and_modify(\|n\| *n += 1)
	172	.or_insert(1);
	173	cs
	174	})
	175	.into_iter()
	176	.map(\|(col, n)\| (n, col))
	177	.collect();
	178	counts.sort_unstable_by(\|(an, acol), (bn, bcol)\| bn.cmp(an).then(acol.cmp(bcol)));
	179	counts
	180	}
	181	fn column_order(rows: &[Row]) -> Vec<String> {
	182	column_counts(rows)
	183	.into_iter()
	184	.map(\|(_, col)\| col)
	185	.collect()
	186	}
	187
	188	fn render_instance(instance: &Option<String>) -> HTML {
	189	match instance {
	190	None => HTML::from("✓"),
	191	Some(instance) => HTML::escape(instance.as_ref()),
	192	}
	193	}
	194
	195	fn render_cell(col: &str, row: &Row) -> HTML {
	196	let row_label = HTML::escape(row.label.as_ref());
	197	let col_label = HTML::escape(col);
	198	let instances: Option<&Vec<Option<String>>> = row.entries.get(col);
	199	let class = HTML::from(if instances.is_none() { "" } else { "yes" });
	200	let all_empty = instances
	201	.iter()
	202	.flat_map(\|is\| is.iter())
	203	.all(Option::is_none);
	204	let contents = if instances.is_none() \|\| (all_empty && instances.unwrap().len() == 1) {
	205	HTML::from("")
	206	} else if all_empty {
	207	HTML(format!("{}", instances.unwrap().len()))
	208	} else {
	209	HTML(
	210	instances
	211	.unwrap()
	212	.iter()
	213	.map(render_instance)
	214	.map(\|html\| html.0) // Waiting for slice_concat_trait to stabilize
	215	.collect::<Vec<_>>()
	216	.join(" "),
	217	)
	218	};
	219	HTML(format!("<td class=\"{class}\" onmouseover=\"h2('{row_label}','{col_label}')\" onmouseout=\"ch2('{row_label}','{col_label}')\">{contents}</td>"))
	220	}
	221
	222	fn render_row(columns: &[String], row: &Row) -> HTML {
	223	let row_label = HTML::escape(row.label.as_ref());
	224	HTML(format!(
	225	"<tr><th id=\"{row_label}\">{row_label}</th>{}</tr>\n",
	226	&columns
	227	.iter()
	228	.map(\|col\| render_cell(col, row))
	229	.collect::<HTML>()
	230	))
	231	}
	232
	233	fn render_column_headers(columns: &[String]) -> HTML {
	234	HTML(
	235	String::from("<tr class=\"key\"><th></th>")
	236	+ &columns.iter().fold(String::new(), \|mut acc, col\| {
	237	let col_header = HTML::escape(col.as_ref());
	238	write!(
	239	&mut acc,
	240	"<th id=\"{col_header}\"><div><div>{col_header}</div></div></th>"
	241	)
	242	.unwrap();
	243	acc
	244	})
	245	+ "</tr>\n",
	246	)
	247	}
	248
	249	/// # Errors
	250	///
	251	/// Will return `Err` if
	252	/// * there's an i/o error while reading `input`
	253	/// * the log has invalid syntax:
	254	/// * an indented line with no preceding non-indented line
	255	pub fn tablify(input: impl std::io::Read) -> Result<HTML, std::io::Error> {
	256	let rows = read_rows(input).collect::<Result<Vec<_>, _>>()?;
	257	let columns = column_order(&rows);
	258	Ok(HTML(format!(
	259	"{HEADER}{}{}{FOOTER}",
	260	render_column_headers(&columns),
	261	rows.into_iter()
	262	.map(\|r\| render_row(&columns, &r))
	263	.collect::<HTML>()
	264	)))
	265	}
	266
	267	#[cfg(test)]
	268	mod tests {
	269	use super::*;
	270
	271	#[test]
	272	fn test_parse_line() {
	273	assert_eq!(InputLine::from(""), InputLine::Blank);
	274	assert_eq!(InputLine::from(" "), InputLine::Blank);
	275	assert_eq!(InputLine::from("foo"), InputLine::RowHeader("foo"));
	276	assert_eq!(InputLine::from("foo "), InputLine::RowHeader("foo"));
	277	assert_eq!(InputLine::from(" foo"), InputLine::Entry("foo", None));
	278	assert_eq!(
	279	InputLine::from(" foo:bar"),
	280	InputLine::Entry("foo", Some("bar"))
	281	);
	282	assert_eq!(
	283	InputLine::from(" foo: bar"),
	284	InputLine::Entry("foo", Some("bar"))
	285	);
	286	assert_eq!(
	287	InputLine::from(" foo: bar "),
	288	InputLine::Entry("foo", Some("bar"))
	289	);
	290	assert_eq!(
	291	InputLine::from(" foo: bar "),
	292	InputLine::Entry("foo", Some("bar"))
	293	);
	294	assert_eq!(
	295	InputLine::from(" foo : bar "),
	296	InputLine::Entry("foo", Some("bar"))
	297	);
	298	}
	299
	300	#[test]
	301	fn test_read_rows() {
	302	assert_eq!(
	303	read_rows(&b"foo"[..]).flatten().collect::<Vec<_>>(),
	304	vec![Row {
	305	label: "foo".to_owned(),
	306	entries: HashMap::new(),
	307	}]
	308	);
	309	assert_eq!(
	310	read_rows(&b"bar"[..]).flatten().collect::<Vec<_>>(),
	311	vec![Row {
	312	label: "bar".to_owned(),
	313	entries: HashMap::new(),
	314	}]
	315	);
	316	assert_eq!(
	317	read_rows(&b"foo\nbar\n"[..]).flatten().collect::<Vec<_>>(),
	318	vec![
	319	Row {
	320	label: "foo".to_owned(),
	321	entries: HashMap::new(),
	322	},
	323	Row {
	324	label: "bar".to_owned(),
	325	entries: HashMap::new(),
	326	}
	327	]
	328	);
	329	assert_eq!(
	330	read_rows(&b"foo\n bar\n"[..]).flatten().collect::<Vec<_>>(),
	331	vec![Row {
	332	label: "foo".to_owned(),
	333	entries: HashMap::from([("bar".to_owned(), vec![None])]),
	334	}]
	335	);
	336	assert_eq!(
	337	read_rows(&b"foo\n bar\n baz\n"[..])
	338	.flatten()
	339	.collect::<Vec<_>>(),
	340	vec![Row {
	341	label: "foo".to_owned(),
	342	entries: HashMap::from([
	343	("bar".to_owned(), vec![None]),
	344	("baz".to_owned(), vec![None])
	345	]),
	346	}]
	347	);
	348	assert_eq!(
	349	read_rows(&b"foo\n\nbar\n"[..])
	350	.flatten()
	351	.collect::<Vec<_>>(),
	352	vec![
	353	Row {
	354	label: "foo".to_owned(),
	355	entries: HashMap::new(),
	356	},
	357	Row {
	358	label: "bar".to_owned(),
	359	entries: HashMap::new(),
	360	}
	361	]
	362	);
	363	assert_eq!(
	364	read_rows(&b"foo\n \nbar\n"[..])
	365	.flatten()
	366	.collect::<Vec<_>>(),
	367	vec![
	368	Row {
	369	label: "foo".to_owned(),
	370	entries: HashMap::new(),
	371	},
	372	Row {
	373	label: "bar".to_owned(),
	374	entries: HashMap::new(),
	375	}
	376	]
	377	);
	378	assert_eq!(
	379	read_rows(&b"foo \n bar \n"[..])
	380	.flatten()
	381	.collect::<Vec<_>>(),
	382	vec![Row {
	383	label: "foo".to_owned(),
	384	entries: HashMap::from([("bar".to_owned(), vec![None])]),
	385	}]
	386	);
	387
	388	let bad = read_rows(&b" foo"[..]).next().unwrap();
	389	assert!(bad.is_err());
	390	assert!(format!("{bad:?}").contains("1: Entry with no header"));
	391
	392	let bad2 = read_rows(&b"foo\n\n bar"[..]).nth(1).unwrap();
	393	assert!(bad2.is_err());
	394	assert!(format!("{bad2:?}").contains("3: Entry with no header"));
	395	}
	396
	397	#[test]
	398	fn test_column_counts() {
	399	assert_eq!(
	400	column_counts(
	401	&read_rows(&b"foo\n bar\n baz\n"[..])
	402	.collect::<Result<Vec<_>, _>>()
	403	.unwrap()
	404	),
	405	vec![(1, String::from("bar")), (1, String::from("baz"))]
	406	);
	407	assert_eq!(
	408	column_counts(
	409	&read_rows(&b"foo\n bar\n baz\nquux\n baz"[..])
	410	.collect::<Result<Vec<_>, _>>()
	411	.unwrap()
	412	),
	413	vec![(2, String::from("baz")), (1, String::from("bar"))]
	414	);
	415	assert_eq!(
	416	column_counts(
	417	&read_rows(&b"foo\n bar\n bar\n baz\n bar\nquux\n baz"[..])
	418	.collect::<Result<Vec<_>, _>>()
	419	.unwrap()
	420	),
	421	vec![(2, String::from("baz")), (1, String::from("bar"))]
	422	);
	423	assert_eq!(
	424	column_counts(
	425	&read_rows(&b"foo\n bar: 1\n bar: 2\n baz\n bar\nquux\n baz"[..])
	426	.collect::<Result<Vec<_>, _>>()
	427	.unwrap()
	428	),
	429	vec![(2, String::from("baz")), (1, String::from("bar"))]
	430	);
	431	}
	432
	433	#[test]
	434	fn test_render_cell() {
	435	assert_eq!(
	436	render_cell(
	437	"foo",
	438	&Row {
	439	label: "nope".to_owned(),
	440	entries: HashMap::new(),
	441	}
	442	),
	443	HTML::from("<td class=\"\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\"></td>")
	444	);
	445	assert_eq!(
	446	render_cell(
	447	"foo",
	448	&Row {
	449	label: "nope".to_owned(),
	450	entries: HashMap::from([("bar".to_owned(), vec![None])]),
	451	}
	452	),
	453	HTML::from("<td class=\"\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\"></td>")
	454	);
	455	assert_eq!(
	456	render_cell(
	457	"foo",
	458	&Row {
	459	label: "nope".to_owned(),
	460	entries: HashMap::from([("foo".to_owned(), vec![None])]),
	461	}
	462	),
	463	HTML::from("<td class=\"yes\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\"></td>")
	464	);
	465	assert_eq!(
	466	render_cell(
	467	"foo",
	468	&Row {
	469	label: "nope".to_owned(),
	470	entries: HashMap::from([("foo".to_owned(), vec![None, None])]),
	471	}
	472	),
	473	HTML::from("<td class=\"yes\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\">2</td>")
	474	);
	475	assert_eq!(
	476	render_cell(
	477	"foo",
	478	&Row {
	479	label: "nope".to_owned(),
	480	entries: HashMap::from([("foo".to_owned(), vec![Some("5".to_owned()), Some("10".to_owned())])]),
	481	}
	482	),
	483	HTML::from("<td class=\"yes\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\">5 10</td>")
	484	);
	485	assert_eq!(
	486	render_cell(
	487	"foo",
	488	&Row {
	489	label: "nope".to_owned(),
	490	entries: HashMap::from([("foo".to_owned(), vec![Some("5".to_owned()), None])]),
	491	}
	492	),
	493	HTML::from("<td class=\"yes\" onmouseover=\"h2('nope','foo')\" onmouseout=\"ch2('nope','foo')\">5 ✓</td>")
	494	);
	495	assert_eq!(
	496	render_cell(
	497	"heart",
	498	&Row {
	499	label: "nope".to_owned(),
	500	entries: HashMap::from([("heart".to_owned(), vec![Some("<3".to_owned())])]),
	501	}
	502	),
	503	HTML::from("<td class=\"yes\" onmouseover=\"h2('nope','heart')\" onmouseout=\"ch2('nope','heart')\"><3</td>")
	504	);
	505	assert_eq!(
	506	render_cell(
	507	"foo",
	508	&Row {
	509	label: "bob's".to_owned(),
	510	entries: HashMap::from([("foo".to_owned(), vec![None])]),
	511	}
	512	),
	513	HTML::from("<td class=\"yes\" onmouseover=\"h2('bob's','foo')\" onmouseout=\"ch2('bob's','foo')\"></td>")
	514	);
	515	}
	516	}