From 12e913005080a9f60750d807c220a58704429361 Mon Sep 17 00:00:00 2001
From: Scott Worley <scottworley@scottworley.com>
Date: Wed, 2 Oct 2024 02:25:40 -0700
Subject: [PATCH 1/1] Make read_rows() strict (not lazy)

---
 src/lib.rs | 60 ++++++++++++++++--------------------------------------
 1 file changed, 18 insertions(+), 42 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index fbadb2a..dbcfc7b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -170,8 +170,8 @@ impl<Input: Iterator<Item = Result<String, std::io::Error>>> Iterator for Reader
     }
 }
 
-fn read_rows(input: impl std::io::Read) -> impl Iterator<Item = Result<Rowlike, std::io::Error>> {
-    Reader::new(std::io::BufReader::new(input).lines())
+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)> {
@@ -304,7 +304,7 @@ fn render_column_headers(columns: &[String]) -> HTML {
 ///   * 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).collect::<Result<Vec<_>, _>>()?;
+    let rows = read_rows(input)?;
     let columns = column_order(config, &rows);
     Ok(HTML(format!(
         "{HEADER}{}{}{FOOTER}",
@@ -351,21 +351,21 @@ mod tests {
     #[test]
     fn test_read_rows() {
         assert_eq!(
-            read_rows(&b"foo"[..]).flatten().collect::<Vec<_>>(),
+            read_rows(&b"foo"[..]).unwrap(),
             vec![Rowlike::Row(Row {
                 label: "foo".to_owned(),
                 entries: HashMap::new(),
             })]
         );
         assert_eq!(
-            read_rows(&b"bar"[..]).flatten().collect::<Vec<_>>(),
+            read_rows(&b"bar"[..]).unwrap(),
             vec![Rowlike::Row(Row {
                 label: "bar".to_owned(),
                 entries: HashMap::new(),
             })]
         );
         assert_eq!(
-            read_rows(&b"foo\nbar\n"[..]).flatten().collect::<Vec<_>>(),
+            read_rows(&b"foo\nbar\n"[..]).unwrap(),
             vec![
                 Rowlike::Row(Row {
                     label: "foo".to_owned(),
@@ -378,16 +378,14 @@ mod tests {
             ]
         );
         assert_eq!(
-            read_rows(&b"foo\n bar\n"[..]).flatten().collect::<Vec<_>>(),
+            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"[..])
-                .flatten()
-                .collect::<Vec<_>>(),
+            read_rows(&b"foo\n bar\n baz\n"[..]).unwrap(),
             vec![Rowlike::Row(Row {
                 label: "foo".to_owned(),
                 entries: HashMap::from([
@@ -397,9 +395,7 @@ mod tests {
             })]
         );
         assert_eq!(
-            read_rows(&b"foo\n\nbar\n"[..])
-                .flatten()
-                .collect::<Vec<_>>(),
+            read_rows(&b"foo\n\nbar\n"[..]).unwrap(),
             vec![
                 Rowlike::Row(Row {
                     label: "foo".to_owned(),
@@ -412,9 +408,7 @@ mod tests {
             ]
         );
         assert_eq!(
-            read_rows(&b"foo\n\n\nbar\n"[..])
-                .flatten()
-                .collect::<Vec<_>>(),
+            read_rows(&b"foo\n\n\nbar\n"[..]).unwrap(),
             vec![
                 Rowlike::Row(Row {
                     label: "foo".to_owned(),
@@ -428,9 +422,7 @@ mod tests {
             ]
         );
         assert_eq!(
-            read_rows(&b"foo\n \nbar\n"[..])
-                .flatten()
-                .collect::<Vec<_>>(),
+            read_rows(&b"foo\n \nbar\n"[..]).unwrap(),
             vec![
                 Rowlike::Row(Row {
                     label: "foo".to_owned(),
@@ -443,20 +435,18 @@ mod tests {
             ]
         );
         assert_eq!(
-            read_rows(&b"foo  \n bar  \n"[..])
-                .flatten()
-                .collect::<Vec<_>>(),
+            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"));
 
-        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"));
     }
@@ -464,34 +454,20 @@ mod tests {
     #[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!(
-            column_counts(
-                &read_rows(&b"foo\n bar\n baz\nquux\n baz"[..])
-                    .collect::<Result<Vec<_>, _>>()
-                    .unwrap()
-            ),
+            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"[..])
-                    .collect::<Result<Vec<_>, _>>()
-                    .unwrap()
-            ),
+            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"[..])
-                    .collect::<Result<Vec<_>, _>>()
-                    .unwrap()
+                &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"))]
         );
-- 
2.44.1