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Plumb config around
[tablify] / src / lib.rs
diff --git a/src/lib.rs b/src/lib.rs
index 1aee9782fcd4b477ba9205fc3badb924bd20765d..acf53834208d68cc32fc75f9959c027e850f54ed 100644 (file)
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,32 +1,48 @@
-use std::collections::{HashMap, HashSet};
+use std::borrow::ToOwned;
+use std::collections::HashMap;
 use std::fmt::Write;
 use std::io::BufRead;
 use std::iter::Iterator;
 
 use std::fmt::Write;
 use std::io::BufRead;
 use std::iter::Iterator;
 
-const HEADER: &str = "<!DOCTYPE html>
+#[derive(PartialEq, Eq, Debug)]
+struct Config {
+    column_threshold: usize,
+}
+impl Config {
+    fn apply_command(&mut self, cmd: &str) -> Result<(), std::io::Error> {
+        if let Some(threshold) = cmd.strip_prefix("col_threshold ") {
+            self.column_threshold = threshold
+                .parse()
+                .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidInput, e))?;
+        }
+        Ok(())
+    }
+}
+
+const HEADER: &str = r#"<!DOCTYPE html>
 <html>
 <head>
 <html>
 <head>
-  <meta charset=\"utf-8\">
-  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
   <style>
   <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; }
     /* 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 }
     table { border-collapse: collapse }
-    tr.key > th { height: 8em; vertical-align: bottom; line-height: 1 }
+    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; }
     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.numeric { text-align: right; }
+    td.leftover { text-align: left; border: none; padding-left: .4em; }
     td.yes { border: thin solid gray; background-color: #ddd; }
     td.yes { border: thin solid gray; background-color: #ddd; }
-    td.spacer { border: none; }
     /* 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; }
     /* 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; }
-    img { height: 1.2em; }
   </style>
   <script>
   </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 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>
     function h2(a, b)  {       highlight(a);       highlight(b); }
     function ch2(a, b) { clear_highlight(a); clear_highlight(b); }
   </script>
@@ -34,105 +50,169 @@ const HEADER: &str = "<!DOCTYPE html>
 <body>
   <table>
     <tbody>
 <body>
   <table>
     <tbody>
-";
+"#;
 const FOOTER: &str = "    </tbody>
   </table>
 </body>
 </html>";
 
 const FOOTER: &str = "    </tbody>
   </table>
 </body>
 </html>";
 
-#[derive(Debug, PartialEq, Eq, Hash)]
-struct Entry {
-    col: String,
-    instance: Option<String>,
+#[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>),
+    Command(&'a str),
 }
 }
-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())),
-            },
+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 let Some(cmd) = trimmed.strip_prefix('!') {
+            InputLine::Command(cmd)
+        } 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)]
         }
     }
 }
 
 #[derive(Debug, PartialEq, Eq)]
-struct RowInput {
+struct Row {
     label: String,
     label: String,
-    entries: Vec<Entry>,
+    entries: HashMap<String, Vec<Option<String>>>,
 }
 
 }
 
-struct Reader<Input: Iterator<Item = Result<String, std::io::Error>>> {
+#[derive(Debug, PartialEq, Eq)]
+enum Rowlike {
+    Row(Row),
+    Spacer,
+}
+
+struct Reader<'cfg, Input: Iterator<Item = Result<String, std::io::Error>>> {
     input: std::iter::Enumerate<Input>,
     input: std::iter::Enumerate<Input>,
-    row: Option<RowInput>,
+    row: Option<Row>,
+    config: &'cfg mut Config,
 }
 }
-impl<Input: Iterator<Item = Result<String, std::io::Error>>> Reader<Input> {
-    fn new(input: Input) -> Self {
+impl<'cfg, Input: Iterator<Item = Result<String, std::io::Error>>> Reader<'cfg, Input> {
+    fn new(config: &'cfg mut Config, input: Input) -> Self {
         Self {
             input: input.enumerate(),
             row: None,
         Self {
             input: input.enumerate(),
             row: None,
+            config,
         }
     }
 }
         }
     }
 }
-impl<Input: Iterator<Item = Result<String, std::io::Error>>> Iterator for Reader<Input> {
-    type Item = Result<RowInput, std::io::Error>;
+impl<'cfg, Input: Iterator<Item = Result<String, std::io::Error>>> Iterator
+    for Reader<'cfg, Input>
+{
+    type Item = Result<Rowlike, std::io::Error>;
     fn next(&mut self) -> Option<Self::Item> {
         loop {
     fn next(&mut self) -> Option<Self::Item> {
         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(),
+            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((_, 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((n, Ok(line))) => match InputLine::from(line.as_ref()) {
+                    InputLine::Command(cmd) => {
+                        if let Err(e) = self.config.apply_command(cmd) {
+                            return Some(Err(e));
+                        }
                     }
                     }
-                    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();
+                    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) -> impl Iterator<Item = Result<RowInput, std::io::Error>> {
-    Reader::new(std::io::BufReader::new(input).lines())
+fn read_input(input: impl std::io::Read) -> Result<(Vec<Rowlike>, Config), std::io::Error> {
+    let mut config = Config {
+        column_threshold: 2,
+    };
+    let reader = Reader::new(&mut config, std::io::BufReader::new(input).lines());
+    reader
+        .collect::<Result<Vec<_>, _>>()
+        .map(|rows| (rows, config))
 }
 
 }
 
-fn column_counts(rows: &[RowInput]) -> Vec<(usize, String)> {
+fn column_counts(rows: &[Rowlike]) -> Vec<(usize, String)> {
+    let empty = HashMap::new();
     let mut counts: Vec<_> = rows
         .iter()
     let mut counts: Vec<_> = rows
         .iter()
-        .flat_map(|r| {
-            r.entries
-                .iter()
-                .map(|e| &e.col)
-                .collect::<HashSet<_>>()
-                .into_iter()
+        .flat_map(|rl| match rl {
+            Rowlike::Row(r) => r.entries.keys(),
+            Rowlike::Spacer => empty.keys(),
         })
         .fold(HashMap::new(), |mut cs, col| {
         })
         .fold(HashMap::new(), |mut cs, col| {
-            cs.entry(String::from(col))
+            cs.entry(col.to_owned())
                 .and_modify(|n| *n += 1)
                 .or_insert(1);
             cs
                 .and_modify(|n| *n += 1)
                 .or_insert(1);
             cs
@@ -140,62 +220,110 @@ fn column_counts(rows: &[RowInput]) -> Vec<(usize, String)> {
         .into_iter()
         .map(|(col, n)| (n, col))
         .collect();
         .into_iter()
         .map(|(col, n)| (n, col))
         .collect();
-    counts.sort();
+    counts.sort_unstable_by(|(an, acol), (bn, bcol)| bn.cmp(an).then(acol.cmp(bcol)));
     counts
 }
     counts
 }
-fn column_order(rows: &[RowInput]) -> Vec<String> {
+fn column_order(config: &Config, rows: &[Rowlike]) -> Vec<String> {
     column_counts(rows)
         .into_iter()
     column_counts(rows)
         .into_iter()
-        .map(|(_, col)| col)
+        .filter_map(|(n, col)| (n >= config.column_threshold).then_some(col))
         .collect()
 }
 
         .collect()
 }
 
-fn render_instance(entry: &Entry) -> String {
-    match &entry.instance {
-        None => String::from("✓ "),
-        Some(instance) => String::from(instance) + " ",
+fn render_one_instance(instance: &Option<String>) -> HTML {
+    match instance {
+        None => HTML::from("✓"),
+        Some(instance) => HTML::escape(instance.as_ref()),
     }
 }
 
     }
 }
 
-fn render_cell(col: &str, row: &RowInput) -> String {
-    // TODO: Escape HTML special characters
-    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()
+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 {
     } else if all_empty {
-        format!("{}", entries.len())
+        HTML(format!("{}", instances.len()))
     } else {
     } else {
-        entries
-            .iter()
-            .map(|i| render_instance(i))
-            .collect::<String>()
+        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),
     };
     };
-    format!("<td class=\"{class}\">{}</td>", contents.trim())
+    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_row(columns: &[String], row: &RowInput) -> String {
-    // This is O(n^2) & doesn't need to be
-    // TODO: Escape HTML special characters
-    format!(
-        "<tr><th>{}</th>{}</tr>\n",
-        row.label,
-        &columns
-            .iter()
-            .map(|col| render_cell(col, row))
-            .collect::<String>()
+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_column_headers(columns: &[String]) -> String {
-    // TODO: Escape HTML special characters
-    String::from("<th></th>")
-        + &columns.iter().fold(String::new(), |mut acc, c| {
-            write!(&mut acc, "<th>{c}</th>").unwrap();
-            acc
-        })
-        + "\n"
+fn render_row(config: &Config, 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(config: &Config, 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
 }
 
 /// # Errors
@@ -204,16 +332,16 @@ fn render_column_headers(columns: &[String]) -> String {
 ///   * there's an i/o error while reading `input`
 ///   * the log has invalid syntax:
 ///     * an indented line with no preceding non-indented line
 ///   * 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_order(&rows);
-    Ok(String::from(HEADER)
-        + &render_column_headers(&columns)
-        + &rows
-            .into_iter()
-            .map(|r| render_row(&columns, &r))
-            .collect::<String>()
-        + FOOTER)
+pub fn tablify(input: impl std::io::Read) -> Result<HTML, std::io::Error> {
+    let (rows, config) = read_input(input)?;
+    let columns = column_order(&config, &rows);
+    Ok(HTML(format!(
+        "{HEADER}{}{}{FOOTER}",
+        render_column_headers(&config, &columns),
+        rows.into_iter()
+            .map(|mut r| render_row(&config, &columns, &mut r))
+            .collect::<HTML>()
+    )))
 }
 
 #[cfg(test)]
 }
 
 #[cfg(test)]
@@ -221,157 +349,176 @@ mod tests {
     use super::*;
 
     #[test]
     use super::*;
 
     #[test]
-    fn test_parse_entry() {
+    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!(
         assert_eq!(
-            Entry::from("foo"),
-            Entry {
-                col: String::from("foo"),
-                instance: None
-            }
+            InputLine::from(" foo:bar"),
+            InputLine::Entry("foo", Some("bar"))
         );
         assert_eq!(
         );
         assert_eq!(
-            Entry::from("foo:bar"),
-            Entry {
-                col: String::from("foo"),
-                instance: Some(String::from("bar"))
-            }
+            InputLine::from(" foo: bar"),
+            InputLine::Entry("foo", Some("bar"))
         );
         assert_eq!(
         );
         assert_eq!(
-            Entry::from("foo: bar"),
-            Entry {
-                col: String::from("foo"),
-                instance: Some(String::from("bar"))
-            }
+            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"))
         );
     }
 
         );
     }
 
+    fn read_rows(input: impl std::io::Read) -> Result<Vec<Rowlike>, std::io::Error> {
+        read_input(input).map(|(rows, _)| rows)
+    }
+    fn read_config(input: impl std::io::Read) -> Result<Config, std::io::Error> {
+        read_input(input).map(|(_, config)| config)
+    }
     #[test]
     fn test_read_rows() {
         assert_eq!(
     #[test]
     fn test_read_rows() {
         assert_eq!(
-            read_rows(&b"foo"[..]).flatten().collect::<Vec<_>>(),
-            vec![RowInput {
-                label: String::from("foo"),
-                entries: vec![]
-            }]
+            read_rows(&b"foo"[..]).unwrap(),
+            vec![Rowlike::Row(Row {
+                label: "foo".to_owned(),
+                entries: HashMap::new(),
+            })]
         );
         assert_eq!(
         );
         assert_eq!(
-            read_rows(&b"bar"[..]).flatten().collect::<Vec<_>>(),
-            vec![RowInput {
-                label: String::from("bar"),
-                entries: vec![]
-            }]
+            read_rows(&b"bar"[..]).unwrap(),
+            vec![Rowlike::Row(Row {
+                label: "bar".to_owned(),
+                entries: HashMap::new(),
+            })]
         );
         assert_eq!(
         );
         assert_eq!(
-            read_rows(&b"foo\nbar\n"[..]).flatten().collect::<Vec<_>>(),
+            read_rows(&b"foo\nbar\n"[..]).unwrap(),
             vec![
             vec![
-                RowInput {
-                    label: String::from("foo"),
-                    entries: vec![]
-                },
-                RowInput {
-                    label: String::from("bar"),
-                    entries: vec![]
-                }
+                Rowlike::Row(Row {
+                    label: "foo".to_owned(),
+                    entries: HashMap::new(),
+                }),
+                Rowlike::Row(Row {
+                    label: "bar".to_owned(),
+                    entries: HashMap::new(),
+                })
             ]
         );
         assert_eq!(
             ]
         );
         assert_eq!(
-            read_rows(&b"foo\n bar\n"[..]).flatten().collect::<Vec<_>>(),
-            vec![RowInput {
-                label: String::from("foo"),
-                entries: vec![Entry::from("bar")]
-            }]
+            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!(
         );
         assert_eq!(
-            read_rows(&b"foo\n bar\n baz\n"[..])
-                .flatten()
-                .collect::<Vec<_>>(),
-            vec![RowInput {
-                label: String::from("foo"),
-                entries: vec![Entry::from("bar"), Entry::from("baz")]
-            }]
+            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!(
         );
         assert_eq!(
-            read_rows(&b"foo\n\nbar\n"[..])
-                .flatten()
-                .collect::<Vec<_>>(),
+            read_rows(&b"foo\n\nbar\n"[..]).unwrap(),
             vec![
             vec![
-                RowInput {
-                    label: String::from("foo"),
-                    entries: vec![]
-                },
-                RowInput {
-                    label: String::from("bar"),
-                    entries: vec![]
-                }
+                Rowlike::Row(Row {
+                    label: "foo".to_owned(),
+                    entries: HashMap::new(),
+                }),
+                Rowlike::Row(Row {
+                    label: "bar".to_owned(),
+                    entries: HashMap::new(),
+                })
             ]
         );
         assert_eq!(
             ]
         );
         assert_eq!(
-            read_rows(&b"foo\n \nbar\n"[..])
-                .flatten()
-                .collect::<Vec<_>>(),
+            read_rows(&b"foo\n\n\nbar\n"[..]).unwrap(),
             vec![
             vec![
-                RowInput {
-                    label: String::from("foo"),
-                    entries: vec![]
-                },
-                RowInput {
-                    label: String::from("bar"),
-                    entries: 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!(
             ]
         );
         assert_eq!(
-            read_rows(&b"foo  \n bar  \n"[..])
-                .flatten()
-                .collect::<Vec<_>>(),
-            vec![RowInput {
-                label: String::from("foo"),
-                entries: vec![Entry::from("bar")]
-            }]
+            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"[..]).next().unwrap();
+        let bad = read_rows(&b" foo"[..]);
         assert!(bad.is_err());
         assert!(format!("{bad:?}").contains("1: Entry with no header"));
 
         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();
+        let bad2 = read_rows(&b"foo\n\n bar"[..]);
         assert!(bad2.is_err());
         assert!(format!("{bad2:?}").contains("3: Entry with no header"));
     }
 
         assert!(bad2.is_err());
         assert!(format!("{bad2:?}").contains("3: Entry with no header"));
     }
 
+    #[test]
+    fn test_read_config() {
+        assert_eq!(
+            read_config(&b"!col_threshold 10"[..])
+                .unwrap()
+                .column_threshold,
+            10
+        );
+
+        let bad_num = read_config(&b"!col_threshold foo"[..]);
+        assert!(bad_num.is_err());
+        assert!(format!("{bad_num:?}").contains("Parse"));
+    }
+
     #[test]
     fn test_column_counts() {
         assert_eq!(
     #[test]
     fn test_column_counts() {
         assert_eq!(
-            column_counts(
-                &read_rows(&b"foo\n bar\n baz\n"[..])
-                    .collect::<Result<Vec<_>, _>>()
-                    .unwrap()
-            ),
+            column_counts(&read_rows(&b"foo\n bar\n baz\n"[..]).unwrap()),
             vec![(1, String::from("bar")), (1, String::from("baz"))]
         );
         assert_eq!(
             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![(1, String::from("bar")), (2, String::from("baz"))]
+            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!(
         );
         assert_eq!(
-            column_counts(
-                &read_rows(&b"foo\n bar\n bar\n baz\n bar\nquux\n baz"[..])
-                    .collect::<Result<Vec<_>, _>>()
-                    .unwrap()
-            ),
-            vec![(1, String::from("bar")), (2, String::from("baz"))]
+            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(
         );
         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()
+                &read_rows(&b"foo\n bar: 1\n bar: 2\n baz\n bar\nquux\n baz"[..]).unwrap()
             ),
             ),
-            vec![(1, String::from("bar")), (2, String::from("baz"))]
+            vec![(2, String::from("baz")), (1, String::from("bar"))]
         );
     }
 
         );
     }
 
@@ -380,62 +527,166 @@ mod tests {
         assert_eq!(
             render_cell(
                 "foo",
         assert_eq!(
             render_cell(
                 "foo",
-                &RowInput {
-                    label: String::from("nope"),
-                    entries: vec![]
+                &mut Row {
+                    label: "nope".to_owned(),
+                    entries: HashMap::new(),
                 }
             ),
                 }
             ),
-            String::from("<td class=\"\"></td>")
+            HTML::from(
+                r#"<td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
+            )
         );
         assert_eq!(
             render_cell(
                 "foo",
         );
         assert_eq!(
             render_cell(
                 "foo",
-                &RowInput {
-                    label: String::from("nope"),
-                    entries: vec![Entry::from("bar")]
+                &mut Row {
+                    label: "nope".to_owned(),
+                    entries: HashMap::from([("bar".to_owned(), vec![None])]),
                 }
             ),
                 }
             ),
-            String::from("<td class=\"\"></td>")
+            HTML::from(
+                r#"<td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
+            )
         );
         assert_eq!(
             render_cell(
                 "foo",
         );
         assert_eq!(
             render_cell(
                 "foo",
-                &RowInput {
-                    label: String::from("nope"),
-                    entries: vec![Entry::from("foo")]
+                &mut Row {
+                    label: "nope".to_owned(),
+                    entries: HashMap::from([("foo".to_owned(), vec![None])]),
                 }
             ),
                 }
             ),
-            String::from("<td class=\"yes\"></td>")
+            HTML::from(
+                r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
+            )
         );
         assert_eq!(
             render_cell(
                 "foo",
         );
         assert_eq!(
             render_cell(
                 "foo",
-                &RowInput {
-                    label: String::from("nope"),
-                    entries: vec![Entry::from("foo"), Entry::from("foo")]
+                &mut Row {
+                    label: "nope".to_owned(),
+                    entries: HashMap::from([("foo".to_owned(), vec![None, None])]),
                 }
             ),
                 }
             ),
-            String::from("<td class=\"yes\">2</td>")
+            HTML::from(
+                r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">2</td>"#
+            )
         );
         assert_eq!(
             render_cell(
                 "foo",
         );
         assert_eq!(
             render_cell(
                 "foo",
-                &RowInput {
-                    label: String::from("nope"),
-                    entries: vec![Entry::from("foo: 5"), Entry::from("foo: 10")]
+                &mut Row {
+                    label: "nope".to_owned(),
+                    entries: HashMap::from([(
+                        "foo".to_owned(),
+                        vec![Some("5".to_owned()), Some("10".to_owned())]
+                    )]),
                 }
             ),
                 }
             ),
-            String::from("<td class=\"yes\">5 10</td>")
+            HTML::from(
+                r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">5 10</td>"#
+            )
         );
         assert_eq!(
             render_cell(
                 "foo",
         );
         assert_eq!(
             render_cell(
                 "foo",
-                &RowInput {
-                    label: String::from("nope"),
-                    entries: vec![Entry::from("foo: 5"), Entry::from("foo")]
+                &mut Row {
+                    label: "nope".to_owned(),
+                    entries: HashMap::from([("foo".to_owned(), vec![Some("5".to_owned()), None])]),
                 }
             ),
                 }
             ),
-            String::from("<td class=\"yes\">5 ✓</td>")
+            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(
+                &Config {
+                    column_threshold: 0,
+                },
+                &["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>
+"#
+            )
         );
     }
 }
         );
     }
 }
Summarize a text log as an HTML table