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;

pub struct Config {
    pub column_threshold: usize,
}

const HEADER: &str = r#"<!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; }
    th.spacer_row { height: .3em; }
    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.leftover { text-align: left; border: none; padding-left: .4em; }
    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>>>,
}

#[derive(Debug, PartialEq, Eq)]
enum Rowlike {
    Row(Row),
    Spacer,
}

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<Rowlike, std::io::Error>;
    fn next(&mut self) -> Option<Self::Item> {
        loop {
            match self.input.next() {
                None => return Ok(std::mem::take(&mut self.row).map(Rowlike::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).map(Rowlike::Row)).transpose()
                    }
                    InputLine::Blank => return Some(Ok(Rowlike::Spacer)),
                    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.map(Rowlike::Row)).transpose();
                        }
                    }
                },
            }
        }
    }
}

fn read_rows(input: impl std::io::Read) -> Result<Vec<Rowlike>, std::io::Error> {
    Reader::new(std::io::BufReader::new(input).lines()).collect::<Result<Vec<_>, _>>()
}

fn column_counts(rows: &[Rowlike]) -> Vec<(usize, String)> {
    let empty = HashMap::new();
    let mut counts: Vec<_> = rows
        .iter()
        .flat_map(|rl| match rl {
            Rowlike::Row(r) => r.entries.keys(),
            Rowlike::Spacer => empty.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(config: &Config, rows: &[Rowlike]) -> Vec<String> {
    column_counts(rows)
        .into_iter()
        .filter_map(|(n, col)| (n >= config.column_threshold).then_some(col))
        .collect()
}

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

fn render_instances(instances: &[Option<String>]) -> HTML {
    let all_empty = instances.iter().all(Option::is_none);
    if all_empty && instances.len() == 1 {
        HTML::from("")
    } else if all_empty {
        HTML(format!("{}", instances.len()))
    } else {
        HTML(
            instances
                .iter()
                .map(render_one_instance)
                .map(|html| html.0) // Waiting for slice_concat_trait to stabilize
                .collect::<Vec<_>>()
                .join(" "),
        )
    }
}

fn render_cell(col: &str, row: &mut 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 contents = match instances {
        None => HTML::from(""),
        Some(is) => render_instances(is),
    };
    row.entries.remove(col);
    HTML(format!(
        r#"<td class="{class}" onmouseover="h2('{row_label}','{col_label}')" onmouseout="ch2('{row_label}','{col_label}')">{contents}</td>"#
    ))
}

fn render_leftover(notcol: &str, instances: &[Option<String>]) -> HTML {
    let label = HTML::escape(notcol);
    let rest = render_instances(instances);
    if rest == HTML::from("") {
        HTML(format!("{label}"))
    } else {
        HTML(format!("{label}: {rest}"))
    }
}

fn render_all_leftovers(row: &Row) -> HTML {
    let mut order: Vec<_> = row.entries.keys().collect();
    order.sort_unstable();
    HTML(
        order
            .into_iter()
            .map(|notcol| render_leftover(notcol, row.entries.get(notcol).expect("Key vanished?!")))
            .map(|html| html.0) // Waiting for slice_concat_trait to stabilize
            .collect::<Vec<_>>()
            .join(", "),
    )
}

fn render_row(columns: &[String], rowlike: &mut Rowlike) -> HTML {
    match rowlike {
        Rowlike::Spacer => HTML::from("<tr><th class=\"spacer_row\"></th></tr>\n"),
        Rowlike::Row(row) => {
            let row_label = HTML::escape(row.label.as_ref());
            let cells = columns
                .iter()
                .map(|col| render_cell(col, row))
                .collect::<HTML>();
            let leftovers = render_all_leftovers(row);
            HTML(format!(
                "<tr><th id=\"{row_label}\">{row_label}</th>{cells}<td class=\"leftover\" onmouseover=\"highlight('{row_label}')\" onmouseout=\"clear_highlight('{row_label}')\">{leftovers}</td></tr>\n"
            ))
        }
    }
}

fn render_column_headers(columns: &[String]) -> HTML {
    HTML(
        String::from(r#"<tr class="key"><th></th>"#)
            + &columns.iter().fold(String::new(), |mut acc, col| {
                let col_header = HTML::escape(col.as_ref());
                write!(
                    &mut acc,
                    r#"<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(config: &Config, input: impl std::io::Read) -> Result<HTML, std::io::Error> {
    let rows = read_rows(input)?;
    let columns = column_order(config, &rows);
    Ok(HTML(format!(
        "{HEADER}{}{}{FOOTER}",
        render_column_headers(&columns),
        rows.into_iter()
            .map(|mut r| render_row(&columns, &mut 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"[..]).unwrap(),
            vec![Rowlike::Row(Row {
                label: "foo".to_owned(),
                entries: HashMap::new(),
            })]
        );
        assert_eq!(
            read_rows(&b"bar"[..]).unwrap(),
            vec![Rowlike::Row(Row {
                label: "bar".to_owned(),
                entries: HashMap::new(),
            })]
        );
        assert_eq!(
            read_rows(&b"foo\nbar\n"[..]).unwrap(),
            vec![
                Rowlike::Row(Row {
                    label: "foo".to_owned(),
                    entries: HashMap::new(),
                }),
                Rowlike::Row(Row {
                    label: "bar".to_owned(),
                    entries: HashMap::new(),
                })
            ]
        );
        assert_eq!(
            read_rows(&b"foo\n bar\n"[..]).unwrap(),
            vec![Rowlike::Row(Row {
                label: "foo".to_owned(),
                entries: HashMap::from([("bar".to_owned(), vec![None])]),
            })]
        );
        assert_eq!(
            read_rows(&b"foo\n bar\n baz\n"[..]).unwrap(),
            vec![Rowlike::Row(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"[..]).unwrap(),
            vec![
                Rowlike::Row(Row {
                    label: "foo".to_owned(),
                    entries: HashMap::new(),
                }),
                Rowlike::Row(Row {
                    label: "bar".to_owned(),
                    entries: HashMap::new(),
                })
            ]
        );
        assert_eq!(
            read_rows(&b"foo\n\n\nbar\n"[..]).unwrap(),
            vec![
                Rowlike::Row(Row {
                    label: "foo".to_owned(),
                    entries: HashMap::new(),
                }),
                Rowlike::Spacer,
                Rowlike::Row(Row {
                    label: "bar".to_owned(),
                    entries: HashMap::new(),
                })
            ]
        );
        assert_eq!(
            read_rows(&b"foo\n \nbar\n"[..]).unwrap(),
            vec![
                Rowlike::Row(Row {
                    label: "foo".to_owned(),
                    entries: HashMap::new(),
                }),
                Rowlike::Row(Row {
                    label: "bar".to_owned(),
                    entries: HashMap::new(),
                })
            ]
        );
        assert_eq!(
            read_rows(&b"foo  \n bar  \n"[..]).unwrap(),
            vec![Rowlike::Row(Row {
                label: "foo".to_owned(),
                entries: HashMap::from([("bar".to_owned(), vec![None])]),
            })]
        );

        let bad = read_rows(&b" foo"[..]);
        assert!(bad.is_err());
        assert!(format!("{bad:?}").contains("1: Entry with no header"));

        let bad2 = read_rows(&b"foo\n\n bar"[..]);
        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"[..]).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"[..]).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"[..]).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"[..]).unwrap()
            ),
            vec![(2, String::from("baz")), (1, String::from("bar"))]
        );
    }

    #[test]
    fn test_render_cell() {
        assert_eq!(
            render_cell(
                "foo",
                &mut Row {
                    label: "nope".to_owned(),
                    entries: HashMap::new(),
                }
            ),
            HTML::from(
                r#"<td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
            )
        );
        assert_eq!(
            render_cell(
                "foo",
                &mut Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("bar".to_owned(), vec![None])]),
                }
            ),
            HTML::from(
                r#"<td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
            )
        );
        assert_eq!(
            render_cell(
                "foo",
                &mut Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("foo".to_owned(), vec![None])]),
                }
            ),
            HTML::from(
                r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
            )
        );
        assert_eq!(
            render_cell(
                "foo",
                &mut Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("foo".to_owned(), vec![None, None])]),
                }
            ),
            HTML::from(
                r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">2</td>"#
            )
        );
        assert_eq!(
            render_cell(
                "foo",
                &mut Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([(
                        "foo".to_owned(),
                        vec![Some("5".to_owned()), Some("10".to_owned())]
                    )]),
                }
            ),
            HTML::from(
                r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">5 10</td>"#
            )
        );
        assert_eq!(
            render_cell(
                "foo",
                &mut Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("foo".to_owned(), vec![Some("5".to_owned()), None])]),
                }
            ),
            HTML::from(
                r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">5 ✓</td>"#
            )
        );
        assert_eq!(
            render_cell(
                "heart",
                &mut Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("heart".to_owned(), vec![Some("<3".to_owned())])]),
                }
            ),
            HTML::from(
                r#"<td class="yes" onmouseover="h2('nope','heart')" onmouseout="ch2('nope','heart')">&lt;3</td>"#
            )
        );
        assert_eq!(
            render_cell(
                "foo",
                &mut Row {
                    label: "bob's".to_owned(),
                    entries: HashMap::from([("foo".to_owned(), vec![None])]),
                }
            ),
            HTML::from(
                r#"<td class="yes" onmouseover="h2('bob&#39;s','foo')" onmouseout="ch2('bob&#39;s','foo')"></td>"#
            )
        );
        let mut r = Row {
            label: "nope".to_owned(),
            entries: HashMap::from([
                ("foo".to_owned(), vec![None]),
                ("baz".to_owned(), vec![None]),
            ]),
        };
        assert_eq!(r.entries.len(), 2);
        render_cell("foo", &mut r);
        assert_eq!(r.entries.len(), 1);
        render_cell("bar", &mut r);
        assert_eq!(r.entries.len(), 1);
        render_cell("baz", &mut r);
        assert_eq!(r.entries.len(), 0);
    }

    #[test]
    fn test_render_leftovers() {
        assert_eq!(
            render_all_leftovers(&Row {
                label: "nope".to_owned(),
                entries: HashMap::from([("foo".to_owned(), vec![None])]),
            }),
            HTML::from("foo")
        );
        assert_eq!(
            render_all_leftovers(&Row {
                label: "nope".to_owned(),
                entries: HashMap::from([
                    ("foo".to_owned(), vec![None]),
                    ("bar".to_owned(), vec![None])
                ]),
            }),
            HTML::from("bar, foo")
        );
        assert_eq!(
            render_all_leftovers(&Row {
                label: "nope".to_owned(),
                entries: HashMap::from([
                    ("foo".to_owned(), vec![None]),
                    ("bar".to_owned(), vec![None, None])
                ]),
            }),
            HTML::from("bar: 2, foo")
        );
    }

    #[test]
    fn test_render_row() {
        assert_eq!(
            render_row(
                &["foo".to_owned()],
                &mut Rowlike::Row(Row {
                    label: "nope".to_owned(),
                    entries: HashMap::from([("bar".to_owned(), vec![None])]),
                })
            ),
            HTML::from(
                r#"<tr><th id="nope">nope</th><td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td><td class="leftover" onmouseover="highlight('nope')" onmouseout="clear_highlight('nope')">bar</td></tr>
"#
            )
        );
    }
}
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	pub struct Config {
	8	pub column_threshold: usize,
	9	}
	10
	11	const HEADER: &str = r#"<!DOCTYPE html>
	12	<html>
	13	<head>
	14	<meta charset="utf-8">
	15	<meta name="viewport" content="width=device-width, initial-scale=1">
	16	<style>
	17	td { text-align: center; }
	18	/* h/t https://wabain.github.io/2019/10/13/css-rotated-table-header.html */
	19	th, td { white-space: nowrap; }
	20	th { text-align: left; font-weight: normal; }
	21	th.spacer_row { height: .3em; }
	22	table { border-collapse: collapse }
	23	tr.key > th { height: 10em; vertical-align: bottom; line-height: 1 }
	24	tr.key > th > div { width: 1em; }
	25	tr.key > th > div > div { width: 5em; transform-origin: bottom left; transform: translateX(1em) rotate(-65deg) }
	26	td { border: thin solid gray; }
	27	td.leftover { text-align: left; border: none; padding-left: .4em; }
	28	td.yes { border: thin solid gray; background-color: #ddd; }
	29	/* h/t https://stackoverflow.com/questions/5687035/css-bolding-some-text-without-changing-its-containers-size/46452396#46452396 */
	30	.highlight { text-shadow: -0.06ex 0 black, 0.06ex 0 black; }
	31	</style>
	32	<script>
	33	function highlight(id) { const e = document.getElementById(id); if (e) { e.classList.add( "highlight"); } }
	34	function clear_highlight(id) { const e = document.getElementById(id); if (e) { e.classList.remove("highlight"); } }
	35	function h2(a, b) { highlight(a); highlight(b); }
	36	function ch2(a, b) { clear_highlight(a); clear_highlight(b); }
	37	</script>
	38	</head>
	39	<body>
	40	<table>
	41	<tbody>
	42	"#;
	43	const FOOTER: &str = " </tbody>
	44	</table>
	45	</body>
	46	</html>";
	47
	48	#[derive(PartialEq, Eq, Debug)]
	49	pub struct HTML(String);
	50	impl HTML {
	51	fn escape(value: &str) -> HTML {
	52	let mut escaped: String = String::new();
	53	for c in value.chars() {
	54	match c {
	55	'>' => escaped.push_str(">"),
	56	'<' => escaped.push_str("<"),
	57	'\'' => escaped.push_str("'"),
	58	'"' => escaped.push_str("""),
	59	'&' => escaped.push_str("&"),
	60	ok_c => escaped.push(ok_c),
	61	}
	62	}
	63	HTML(escaped)
	64	}
	65	}
	66	impl From<&str> for HTML {
	67	fn from(value: &str) -> HTML {
	68	HTML(String::from(value))
	69	}
	70	}
	71	impl FromIterator<HTML> for HTML {
	72	fn from_iter<T>(iter: T) -> HTML
	73	where
	74	T: IntoIterator<Item = HTML>,
	75	{
	76	HTML(iter.into_iter().map(\|html\| html.0).collect::<String>())
	77	}
	78	}
	79	impl std::fmt::Display for HTML {
	80	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
	81	write!(f, "{}", self.0)
	82	}
	83	}
	84
	85	#[derive(Debug, PartialEq, Eq)]
	86	enum InputLine<'a> {
	87	Blank,
	88	RowHeader(&'a str),
	89	Entry(&'a str, Option<&'a str>),
	90	}
	91	impl<'a> From<&'a str> for InputLine<'a> {
	92	fn from(value: &'a str) -> InputLine<'a> {
	93	let trimmed = value.trim_end();
	94	if trimmed.is_empty() {
	95	InputLine::Blank
	96	} else if !trimmed.starts_with(' ') {
	97	InputLine::RowHeader(value.trim())
	98	} else {
	99	match value.split_once(':') {
	100	None => InputLine::Entry(value.trim(), None),
	101	Some((col, instance)) => InputLine::Entry(col.trim(), Some(instance.trim())),
	102	}
	103	}
	104	}
	105	}
	106
	107	#[derive(Debug, PartialEq, Eq)]
	108	struct Row {
	109	label: String,
	110	entries: HashMap<String, Vec<Option<String>>>,
	111	}
	112
	113	#[derive(Debug, PartialEq, Eq)]
	114	enum Rowlike {
	115	Row(Row),
	116	Spacer,
	117	}
	118
	119	struct Reader<Input: Iterator<Item = Result<String, std::io::Error>>> {
	120	input: std::iter::Enumerate<Input>,
	121	row: Option<Row>,
	122	}
	123	impl<Input: Iterator<Item = Result<String, std::io::Error>>> Reader<Input> {
	124	fn new(input: Input) -> Self {
	125	Self {
	126	input: input.enumerate(),
	127	row: None,
	128	}
	129	}
	130	}
	131	impl<Input: Iterator<Item = Result<String, std::io::Error>>> Iterator for Reader<Input> {
	132	type Item = Result<Rowlike, std::io::Error>;
	133	fn next(&mut self) -> Option<Self::Item> {
	134	loop {
	135	match self.input.next() {
	136	None => return Ok(std::mem::take(&mut self.row).map(Rowlike::Row)).transpose(),
	137	Some((_, Err(e))) => return Some(Err(e)),
	138	Some((n, Ok(line))) => match InputLine::from(line.as_ref()) {
	139	InputLine::Blank if self.row.is_some() => {
	140	return Ok(std::mem::take(&mut self.row).map(Rowlike::Row)).transpose()
	141	}
	142	InputLine::Blank => return Some(Ok(Rowlike::Spacer)),
	143	InputLine::Entry(col, instance) => match &mut self.row {
	144	None => {
	145	return Some(Err(std::io::Error::other(format!(
	146	"{}: Entry with no header",
	147	n + 1
	148	))))
	149	}
	150	Some(ref mut row) => {
	151	row.entries
	152	.entry(col.to_owned())
	153	.and_modify(\|is\| is.push(instance.map(ToOwned::to_owned)))
	154	.or_insert_with(\|\| vec![instance.map(ToOwned::to_owned)]);
	155	}
	156	},
	157	InputLine::RowHeader(row) => {
	158	let prev = std::mem::take(&mut self.row);
	159	self.row = Some(Row {
	160	label: row.to_owned(),
	161	entries: HashMap::new(),
	162	});
	163	if prev.is_some() {
	164	return Ok(prev.map(Rowlike::Row)).transpose();
	165	}
	166	}
	167	},
	168	}
	169	}
	170	}
	171	}
	172
	173	fn read_rows(input: impl std::io::Read) -> Result<Vec<Rowlike>, std::io::Error> {
	174	Reader::new(std::io::BufReader::new(input).lines()).collect::<Result<Vec<_>, _>>()
	175	}
	176
	177	fn column_counts(rows: &[Rowlike]) -> Vec<(usize, String)> {
	178	let empty = HashMap::new();
	179	let mut counts: Vec<_> = rows
	180	.iter()
	181	.flat_map(\|rl\| match rl {
	182	Rowlike::Row(r) => r.entries.keys(),
	183	Rowlike::Spacer => empty.keys(),
	184	})
	185	.fold(HashMap::new(), \|mut cs, col\| {
	186	cs.entry(col.to_owned())
	187	.and_modify(\|n\| *n += 1)
	188	.or_insert(1);
	189	cs
	190	})
	191	.into_iter()
	192	.map(\|(col, n)\| (n, col))
	193	.collect();
	194	counts.sort_unstable_by(\|(an, acol), (bn, bcol)\| bn.cmp(an).then(acol.cmp(bcol)));
	195	counts
	196	}
	197	fn column_order(config: &Config, rows: &[Rowlike]) -> Vec<String> {
	198	column_counts(rows)
	199	.into_iter()
	200	.filter_map(\|(n, col)\| (n >= config.column_threshold).then_some(col))
	201	.collect()
	202	}
	203
	204	fn render_one_instance(instance: &Option<String>) -> HTML {
	205	match instance {
	206	None => HTML::from("✓"),
	207	Some(instance) => HTML::escape(instance.as_ref()),
	208	}
	209	}
	210
	211	fn render_instances(instances: &[Option<String>]) -> HTML {
	212	let all_empty = instances.iter().all(Option::is_none);
	213	if all_empty && instances.len() == 1 {
	214	HTML::from("")
	215	} else if all_empty {
	216	HTML(format!("{}", instances.len()))
	217	} else {
	218	HTML(
	219	instances
	220	.iter()
	221	.map(render_one_instance)
	222	.map(\|html\| html.0) // Waiting for slice_concat_trait to stabilize
	223	.collect::<Vec<_>>()
	224	.join(" "),
	225	)
	226	}
	227	}
	228
	229	fn render_cell(col: &str, row: &mut Row) -> HTML {
	230	let row_label = HTML::escape(row.label.as_ref());
	231	let col_label = HTML::escape(col);
	232	let instances: Option<&Vec<Option<String>>> = row.entries.get(col);
	233	let class = HTML::from(if instances.is_none() { "" } else { "yes" });
	234	let contents = match instances {
	235	None => HTML::from(""),
	236	Some(is) => render_instances(is),
	237	};
	238	row.entries.remove(col);
	239	HTML(format!(
	240	r#"<td class="{class}" onmouseover="h2('{row_label}','{col_label}')" onmouseout="ch2('{row_label}','{col_label}')">{contents}</td>"#
	241	))
	242	}
	243
	244	fn render_leftover(notcol: &str, instances: &[Option<String>]) -> HTML {
	245	let label = HTML::escape(notcol);
	246	let rest = render_instances(instances);
	247	if rest == HTML::from("") {
	248	HTML(format!("{label}"))
	249	} else {
	250	HTML(format!("{label}: {rest}"))
	251	}
	252	}
	253
	254	fn render_all_leftovers(row: &Row) -> HTML {
	255	let mut order: Vec<_> = row.entries.keys().collect();
	256	order.sort_unstable();
	257	HTML(
	258	order
	259	.into_iter()
	260	.map(\|notcol\| render_leftover(notcol, row.entries.get(notcol).expect("Key vanished?!")))
	261	.map(\|html\| html.0) // Waiting for slice_concat_trait to stabilize
	262	.collect::<Vec<_>>()
	263	.join(", "),
	264	)
	265	}
	266
	267	fn render_row(columns: &[String], rowlike: &mut Rowlike) -> HTML {
	268	match rowlike {
	269	Rowlike::Spacer => HTML::from("<tr><th class=\"spacer_row\"></th></tr>\n"),
	270	Rowlike::Row(row) => {
	271	let row_label = HTML::escape(row.label.as_ref());
	272	let cells = columns
	273	.iter()
	274	.map(\|col\| render_cell(col, row))
	275	.collect::<HTML>();
	276	let leftovers = render_all_leftovers(row);
	277	HTML(format!(
	278	"<tr><th id=\"{row_label}\">{row_label}</th>{cells}<td class=\"leftover\" onmouseover=\"highlight('{row_label}')\" onmouseout=\"clear_highlight('{row_label}')\">{leftovers}</td></tr>\n"
	279	))
	280	}
	281	}
	282	}
	283
	284	fn render_column_headers(columns: &[String]) -> HTML {
	285	HTML(
	286	String::from(r#"<tr class="key"><th></th>"#)
	287	+ &columns.iter().fold(String::new(), \|mut acc, col\| {
	288	let col_header = HTML::escape(col.as_ref());
	289	write!(
	290	&mut acc,
	291	r#"<th id="{col_header}"><div><div>{col_header}</div></div></th>"#
	292	)
	293	.unwrap();
	294	acc
	295	})
	296	+ "</tr>\n",
	297	)
	298	}
	299
	300	/// # Errors
	301	///
	302	/// Will return `Err` if
	303	/// * there's an i/o error while reading `input`
	304	/// * the log has invalid syntax:
	305	/// * an indented line with no preceding non-indented line
	306	pub fn tablify(config: &Config, input: impl std::io::Read) -> Result<HTML, std::io::Error> {
	307	let rows = read_rows(input)?;
	308	let columns = column_order(config, &rows);
	309	Ok(HTML(format!(
	310	"{HEADER}{}{}{FOOTER}",
	311	render_column_headers(&columns),
	312	rows.into_iter()
	313	.map(\|mut r\| render_row(&columns, &mut r))
	314	.collect::<HTML>()
	315	)))
	316	}
	317
	318	#[cfg(test)]
	319	mod tests {
	320	use super::*;
	321
	322	#[test]
	323	fn test_parse_line() {
	324	assert_eq!(InputLine::from(""), InputLine::Blank);
	325	assert_eq!(InputLine::from(" "), InputLine::Blank);
	326	assert_eq!(InputLine::from("foo"), InputLine::RowHeader("foo"));
	327	assert_eq!(InputLine::from("foo "), InputLine::RowHeader("foo"));
	328	assert_eq!(InputLine::from(" foo"), InputLine::Entry("foo", None));
	329	assert_eq!(
	330	InputLine::from(" foo:bar"),
	331	InputLine::Entry("foo", Some("bar"))
	332	);
	333	assert_eq!(
	334	InputLine::from(" foo: bar"),
	335	InputLine::Entry("foo", Some("bar"))
	336	);
	337	assert_eq!(
	338	InputLine::from(" foo: bar "),
	339	InputLine::Entry("foo", Some("bar"))
	340	);
	341	assert_eq!(
	342	InputLine::from(" foo: bar "),
	343	InputLine::Entry("foo", Some("bar"))
	344	);
	345	assert_eq!(
	346	InputLine::from(" foo : bar "),
	347	InputLine::Entry("foo", Some("bar"))
	348	);
	349	}
	350
	351	#[test]
	352	fn test_read_rows() {
	353	assert_eq!(
	354	read_rows(&b"foo"[..]).unwrap(),
	355	vec![Rowlike::Row(Row {
	356	label: "foo".to_owned(),
	357	entries: HashMap::new(),
	358	})]
	359	);
	360	assert_eq!(
	361	read_rows(&b"bar"[..]).unwrap(),
	362	vec![Rowlike::Row(Row {
	363	label: "bar".to_owned(),
	364	entries: HashMap::new(),
	365	})]
	366	);
	367	assert_eq!(
	368	read_rows(&b"foo\nbar\n"[..]).unwrap(),
	369	vec![
	370	Rowlike::Row(Row {
	371	label: "foo".to_owned(),
	372	entries: HashMap::new(),
	373	}),
	374	Rowlike::Row(Row {
	375	label: "bar".to_owned(),
	376	entries: HashMap::new(),
	377	})
	378	]
	379	);
	380	assert_eq!(
	381	read_rows(&b"foo\n bar\n"[..]).unwrap(),
	382	vec![Rowlike::Row(Row {
	383	label: "foo".to_owned(),
	384	entries: HashMap::from([("bar".to_owned(), vec![None])]),
	385	})]
	386	);
	387	assert_eq!(
	388	read_rows(&b"foo\n bar\n baz\n"[..]).unwrap(),
	389	vec![Rowlike::Row(Row {
	390	label: "foo".to_owned(),
	391	entries: HashMap::from([
	392	("bar".to_owned(), vec![None]),
	393	("baz".to_owned(), vec![None])
	394	]),
	395	})]
	396	);
	397	assert_eq!(
	398	read_rows(&b"foo\n\nbar\n"[..]).unwrap(),
	399	vec![
	400	Rowlike::Row(Row {
	401	label: "foo".to_owned(),
	402	entries: HashMap::new(),
	403	}),
	404	Rowlike::Row(Row {
	405	label: "bar".to_owned(),
	406	entries: HashMap::new(),
	407	})
	408	]
	409	);
	410	assert_eq!(
	411	read_rows(&b"foo\n\n\nbar\n"[..]).unwrap(),
	412	vec![
	413	Rowlike::Row(Row {
	414	label: "foo".to_owned(),
	415	entries: HashMap::new(),
	416	}),
	417	Rowlike::Spacer,
	418	Rowlike::Row(Row {
	419	label: "bar".to_owned(),
	420	entries: HashMap::new(),
	421	})
	422	]
	423	);
	424	assert_eq!(
	425	read_rows(&b"foo\n \nbar\n"[..]).unwrap(),
	426	vec![
	427	Rowlike::Row(Row {
	428	label: "foo".to_owned(),
	429	entries: HashMap::new(),
	430	}),
	431	Rowlike::Row(Row {
	432	label: "bar".to_owned(),
	433	entries: HashMap::new(),
	434	})
	435	]
	436	);
	437	assert_eq!(
	438	read_rows(&b"foo \n bar \n"[..]).unwrap(),
	439	vec![Rowlike::Row(Row {
	440	label: "foo".to_owned(),
	441	entries: HashMap::from([("bar".to_owned(), vec![None])]),
	442	})]
	443	);
	444
	445	let bad = read_rows(&b" foo"[..]);
	446	assert!(bad.is_err());
	447	assert!(format!("{bad:?}").contains("1: Entry with no header"));
	448
	449	let bad2 = read_rows(&b"foo\n\n bar"[..]);
	450	assert!(bad2.is_err());
	451	assert!(format!("{bad2:?}").contains("3: Entry with no header"));
	452	}
	453
	454	#[test]
	455	fn test_column_counts() {
	456	assert_eq!(
	457	column_counts(&read_rows(&b"foo\n bar\n baz\n"[..]).unwrap()),
	458	vec![(1, String::from("bar")), (1, String::from("baz"))]
	459	);
	460	assert_eq!(
	461	column_counts(&read_rows(&b"foo\n bar\n baz\nquux\n baz"[..]).unwrap()),
	462	vec![(2, String::from("baz")), (1, String::from("bar"))]
	463	);
	464	assert_eq!(
	465	column_counts(&read_rows(&b"foo\n bar\n bar\n baz\n bar\nquux\n baz"[..]).unwrap()),
	466	vec![(2, String::from("baz")), (1, String::from("bar"))]
	467	);
	468	assert_eq!(
	469	column_counts(
	470	&read_rows(&b"foo\n bar: 1\n bar: 2\n baz\n bar\nquux\n baz"[..]).unwrap()
	471	),
	472	vec![(2, String::from("baz")), (1, String::from("bar"))]
	473	);
	474	}
	475
	476	#[test]
	477	fn test_render_cell() {
	478	assert_eq!(
	479	render_cell(
	480	"foo",
	481	&mut Row {
	482	label: "nope".to_owned(),
	483	entries: HashMap::new(),
	484	}
	485	),
	486	HTML::from(
	487	r#"<td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
	488	)
	489	);
	490	assert_eq!(
	491	render_cell(
	492	"foo",
	493	&mut Row {
	494	label: "nope".to_owned(),
	495	entries: HashMap::from([("bar".to_owned(), vec![None])]),
	496	}
	497	),
	498	HTML::from(
	499	r#"<td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
	500	)
	501	);
	502	assert_eq!(
	503	render_cell(
	504	"foo",
	505	&mut Row {
	506	label: "nope".to_owned(),
	507	entries: HashMap::from([("foo".to_owned(), vec![None])]),
	508	}
	509	),
	510	HTML::from(
	511	r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
	512	)
	513	);
	514	assert_eq!(
	515	render_cell(
	516	"foo",
	517	&mut Row {
	518	label: "nope".to_owned(),
	519	entries: HashMap::from([("foo".to_owned(), vec![None, None])]),
	520	}
	521	),
	522	HTML::from(
	523	r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">2</td>"#
	524	)
	525	);
	526	assert_eq!(
	527	render_cell(
	528	"foo",
	529	&mut Row {
	530	label: "nope".to_owned(),
	531	entries: HashMap::from([(
	532	"foo".to_owned(),
	533	vec![Some("5".to_owned()), Some("10".to_owned())]
	534	)]),
	535	}
	536	),
	537	HTML::from(
	538	r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">5 10</td>"#
	539	)
	540	);
	541	assert_eq!(
	542	render_cell(
	543	"foo",
	544	&mut Row {
	545	label: "nope".to_owned(),
	546	entries: HashMap::from([("foo".to_owned(), vec![Some("5".to_owned()), None])]),
	547	}
	548	),
	549	HTML::from(
	550	r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">5 ✓</td>"#
	551	)
	552	);
	553	assert_eq!(
	554	render_cell(
	555	"heart",
	556	&mut Row {
	557	label: "nope".to_owned(),
	558	entries: HashMap::from([("heart".to_owned(), vec![Some("<3".to_owned())])]),
	559	}
	560	),
	561	HTML::from(
	562	r#"<td class="yes" onmouseover="h2('nope','heart')" onmouseout="ch2('nope','heart')"><3</td>"#
	563	)
	564	);
	565	assert_eq!(
	566	render_cell(
	567	"foo",
	568	&mut Row {
	569	label: "bob's".to_owned(),
	570	entries: HashMap::from([("foo".to_owned(), vec![None])]),
	571	}
	572	),
	573	HTML::from(
	574	r#"<td class="yes" onmouseover="h2('bob's','foo')" onmouseout="ch2('bob's','foo')"></td>"#
	575	)
	576	);
	577	let mut r = Row {
	578	label: "nope".to_owned(),
	579	entries: HashMap::from([
	580	("foo".to_owned(), vec![None]),
	581	("baz".to_owned(), vec![None]),
	582	]),
	583	};
	584	assert_eq!(r.entries.len(), 2);
	585	render_cell("foo", &mut r);
	586	assert_eq!(r.entries.len(), 1);
	587	render_cell("bar", &mut r);
	588	assert_eq!(r.entries.len(), 1);
	589	render_cell("baz", &mut r);
	590	assert_eq!(r.entries.len(), 0);
	591	}
	592
	593	#[test]
	594	fn test_render_leftovers() {
	595	assert_eq!(
	596	render_all_leftovers(&Row {
	597	label: "nope".to_owned(),
	598	entries: HashMap::from([("foo".to_owned(), vec![None])]),
	599	}),
	600	HTML::from("foo")
	601	);
	602	assert_eq!(
	603	render_all_leftovers(&Row {
	604	label: "nope".to_owned(),
	605	entries: HashMap::from([
	606	("foo".to_owned(), vec![None]),
	607	("bar".to_owned(), vec![None])
	608	]),
	609	}),
	610	HTML::from("bar, foo")
	611	);
	612	assert_eq!(
	613	render_all_leftovers(&Row {
	614	label: "nope".to_owned(),
	615	entries: HashMap::from([
	616	("foo".to_owned(), vec![None]),
	617	("bar".to_owned(), vec![None, None])
	618	]),
	619	}),
	620	HTML::from("bar: 2, foo")
	621	);
	622	}
	623
	624	#[test]
	625	fn test_render_row() {
	626	assert_eq!(
	627	render_row(
	628	&["foo".to_owned()],
	629	&mut Rowlike::Row(Row {
	630	label: "nope".to_owned(),
	631	entries: HashMap::from([("bar".to_owned(), vec![None])]),
	632	})
	633	),
	634	HTML::from(
	635	r#"<tr><th id="nope">nope</th><td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td><td class="leftover" onmouseover="highlight('nope')" onmouseout="clear_highlight('nope')">bar</td></tr>
	636	"#
	637	)
	638	);
	639	}
	640	}