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chunkmd: say rfind, which is what this was doing

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funkpower
2026-09-19 17:36:18 -04:00
parent e811a4d724
commit a80f8a024d
1 changed files with 3 additions and 2 deletions
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crates/chunkmd/src/pages.rs
+3 -2
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@@ -179,9 +179,11 @@ impl<'a> ChapterIndex<'a> {
/// per page in every chapter's span: a single mistyped marker reading
/// `<!-- Page 20231115 -->` would ask for a gigabyte of them.
pub fn chapter_of_page(chapters: &[Chapter], page: u32) -> Option<&str> {
// The last chapter that covers the page, not the first: chapters can
// nest, and the innermost one is the one a reader would name.
chapters
.iter()
.filter(|chapter| {
.rfind(|chapter| {
let Some(start) = chapter.start_page else {
return false;
};
@@ -193,7 +195,6 @@ pub fn chapter_of_page(chapters: &[Chapter], page: u32) -> Option<&str> {
};
(start..=end.max(start)).contains(&page) && end >= start
})
.next_back()
.map(|chapter| chapter.title.as_str())
}