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Allow forcing column layout with `!col <name>` in input
[tablify] / src / lib.rs
diff --git a/src/lib.rs b/src/lib.rs
index 5c994c9f20a0d8eeb63650d4d9618c6da6dc75dc..af582d45272207432a0d5de47e6f01be1dcf9938 100644 (file)
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,11 +1,25 @@
 use std::borrow::ToOwned;
 use std::borrow::ToOwned;
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 use std::fmt::Write;
 use std::io::BufRead;
 use std::iter::Iterator;
 
 use std::fmt::Write;
 use std::io::BufRead;
 use std::iter::Iterator;
 
-pub struct Config {
-    pub column_threshold: usize,
+#[derive(PartialEq, Eq, Debug)]
+struct Config {
+    column_threshold: usize,
+    static_columns: Vec<String>,
+}
+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))?;
+        } else if let Some(col) = cmd.strip_prefix("col ") {
+            self.static_columns.push(col.to_owned());
+        }
+        Ok(())
+    }
 }
 
 const HEADER: &str = r#"<!DOCTYPE html>
 }
 
 const HEADER: &str = r#"<!DOCTYPE html>
@@ -87,12 +101,15 @@ enum InputLine<'a> {
     Blank,
     RowHeader(&'a str),
     Entry(&'a str, Option<&'a str>),
     Blank,
     RowHeader(&'a str),
     Entry(&'a str, Option<&'a str>),
+    Command(&'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
 }
 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 {
         } else if !trimmed.starts_with(' ') {
             InputLine::RowHeader(value.trim())
         } else {
@@ -116,19 +133,23 @@ enum Rowlike {
     Spacer,
 }
 
     Spacer,
 }
 
-struct Reader<Input: Iterator<Item = Result<String, std::io::Error>>> {
+struct Reader<'cfg, Input: Iterator<Item = Result<String, std::io::Error>>> {
     input: std::iter::Enumerate<Input>,
     row: Option<Row>,
     input: std::iter::Enumerate<Input>,
     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> {
+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 {
     type Item = Result<Rowlike, std::io::Error>;
     fn next(&mut self) -> Option<Self::Item> {
         loop {
@@ -136,6 +157,11 @@ impl<Input: Iterator<Item = Result<String, std::io::Error>>> Iterator for Reader
                 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()) {
                 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::Command(cmd) => {
+                        if let Err(e) = self.config.apply_command(cmd) {
+                            return Some(Err(e));
+                        }
+                    }
                     InputLine::Blank if self.row.is_some() => {
                         return Ok(std::mem::take(&mut self.row).map(Rowlike::Row)).transpose()
                     }
                     InputLine::Blank if self.row.is_some() => {
                         return Ok(std::mem::take(&mut self.row).map(Rowlike::Row)).transpose()
                     }
@@ -171,12 +197,14 @@ impl<Input: Iterator<Item = Result<String, std::io::Error>>> Iterator for Reader
 }
 
 fn read_input(input: impl std::io::Read) -> Result<(Vec<Rowlike>, Config), std::io::Error> {
 }
 
 fn read_input(input: impl std::io::Read) -> Result<(Vec<Rowlike>, Config), std::io::Error> {
-    let default_config = Config {
+    let mut config = Config {
         column_threshold: 2,
         column_threshold: 2,
+        static_columns: vec![],
     };
     };
-    Reader::new(std::io::BufReader::new(input).lines())
+    let reader = Reader::new(&mut config, std::io::BufReader::new(input).lines());
+    reader
         .collect::<Result<Vec<_>, _>>()
         .collect::<Result<Vec<_>, _>>()
-        .map(|rows| (rows, default_config))
+        .map(|rows| (rows, config))
 }
 
 fn column_counts(rows: &[Rowlike]) -> Vec<(usize, String)> {
 }
 
 fn column_counts(rows: &[Rowlike]) -> Vec<(usize, String)> {
@@ -200,9 +228,16 @@ fn column_counts(rows: &[Rowlike]) -> Vec<(usize, String)> {
     counts
 }
 fn column_order(config: &Config, rows: &[Rowlike]) -> Vec<String> {
     counts
 }
 fn column_order(config: &Config, rows: &[Rowlike]) -> Vec<String> {
+    let static_columns: HashSet<&str> = config
+        .static_columns
+        .iter()
+        .map(std::string::String::as_str)
+        .collect();
     column_counts(rows)
         .into_iter()
     column_counts(rows)
         .into_iter()
-        .filter_map(|(n, col)| (n >= config.column_threshold).then_some(col))
+        .filter_map(|(n, col)| {
+            (n >= config.column_threshold && !static_columns.contains(col.as_str())).then_some(col)
+        })
         .collect()
 }
 
         .collect()
 }
 
@@ -269,35 +304,43 @@ fn render_all_leftovers(row: &Row) -> HTML {
     )
 }
 
     )
 }
 
-fn render_row(columns: &[String], rowlike: &mut Rowlike) -> HTML {
+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());
     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
+            let static_cells = config
+                .static_columns
+                .iter()
+                .map(|col| render_cell(col, row))
+                .collect::<HTML>();
+            let dynamic_cells = columns
                 .iter()
                 .map(|col| render_cell(col, row))
                 .collect::<HTML>();
             let leftovers = render_all_leftovers(row);
             HTML(format!(
                 .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"
+                "<tr><th id=\"{row_label}\">{row_label}</th>{static_cells}{dynamic_cells}<td class=\"leftover\" onmouseover=\"highlight('{row_label}')\" onmouseout=\"clear_highlight('{row_label}')\">{leftovers}</td></tr>\n"
             ))
         }
     }
 }
 
             ))
         }
     }
 }
 
-fn render_column_headers(columns: &[String]) -> HTML {
+fn render_column_headers(config: &Config, columns: &[String]) -> HTML {
     HTML(
         String::from(r#"<tr class="key"><th></th>"#)
     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
-            })
+            + &config.static_columns.iter().chain(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",
     )
 }
             + "</tr>\n",
     )
 }
@@ -313,9 +356,9 @@ pub fn tablify(input: impl std::io::Read) -> Result<HTML, std::io::Error> {
     let columns = column_order(&config, &rows);
     Ok(HTML(format!(
         "{HEADER}{}{}{FOOTER}",
     let columns = column_order(&config, &rows);
     Ok(HTML(format!(
         "{HEADER}{}{}{FOOTER}",
-        render_column_headers(&columns),
+        render_column_headers(&config, &columns),
         rows.into_iter()
         rows.into_iter()
-            .map(|mut r| render_row(&columns, &mut r))
+            .map(|mut r| render_row(&config, &columns, &mut r))
             .collect::<HTML>()
     )))
 }
             .collect::<HTML>()
     )))
 }
@@ -356,6 +399,9 @@ mod tests {
     fn read_rows(input: impl std::io::Read) -> Result<Vec<Rowlike>, std::io::Error> {
         read_input(input).map(|(rows, _)| rows)
     }
     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!(
@@ -459,6 +505,24 @@ mod tests {
         assert!(format!("{bad2:?}").contains("3: Entry with no header"));
     }
 
         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
+        );
+        assert_eq!(
+            read_config(&b"!col foo"[..]).unwrap().static_columns,
+            vec!["foo".to_owned()]
+        );
+
+        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!(
@@ -633,6 +697,10 @@ mod tests {
     fn test_render_row() {
         assert_eq!(
             render_row(
     fn test_render_row() {
         assert_eq!(
             render_row(
+                &Config {
+                    column_threshold: 0,
+                    static_columns: vec![],
+                },
                 &["foo".to_owned()],
                 &mut Rowlike::Row(Row {
                     label: "nope".to_owned(),
                 &["foo".to_owned()],
                 &mut Rowlike::Row(Row {
                     label: "nope".to_owned(),
@@ -641,6 +709,27 @@ mod tests {
             ),
             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>
             ),
             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>
+"#
+            )
+        );
+        assert_eq!(
+            render_row(
+                &Config {
+                    column_threshold: 0,
+                    static_columns: vec!["foo".to_owned(), "bar".to_owned()],
+                },
+                &["baz".to_owned()],
+                &mut Rowlike::Row(Row {
+                    label: "nope".to_owned(),
+                    entries: HashMap::from([
+                        ("bar".to_owned(), vec![Some("r".to_owned())]),
+                        ("baz".to_owned(), vec![Some("z".to_owned())]),
+                        ("foo".to_owned(), vec![Some("f".to_owned())]),
+                    ]),
+                })
+            ),
+            HTML::from(
+                r#"<tr><th id="nope">nope</th><td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">f</td><td class="yes" onmouseover="h2('nope','bar')" onmouseout="ch2('nope','bar')">r</td><td class="yes" onmouseover="h2('nope','baz')" onmouseout="ch2('nope','baz')">z</td><td class="leftover" onmouseover="highlight('nope')" onmouseout="clear_highlight('nope')"></td></tr>
 "#
             )
         );
 "#
             )
         );
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