From 4e8199b572f2035b7749cba276ece3a26630d23e Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:18:21 +0200
Subject: Adding upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/librustdoc/html/sources.rs | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

(limited to 'src/librustdoc/html/sources.rs')

diff --git a/src/librustdoc/html/sources.rs b/src/librustdoc/html/sources.rs
index 7ab65bff3..54e296959 100644
--- a/src/librustdoc/html/sources.rs
+++ b/src/librustdoc/html/sources.rs
@@ -258,7 +258,7 @@ where
 
 pub(crate) enum SourceContext {
     Standalone,
-    Embedded { offset: usize },
+    Embedded { offset: usize, needs_expansion: bool },
 }
 
 /// Wrapper struct to render the source code of a file. This will do things like
@@ -274,28 +274,37 @@ pub(crate) fn print_src(
 ) {
     let lines = s.lines().count();
     let mut line_numbers = Buffer::empty_from(buf);
+    let extra;
     line_numbers.write_str("<pre class=\"src-line-numbers\">");
+    let current_href = &context
+        .href_from_span(clean::Span::new(file_span), false)
+        .expect("only local crates should have sources emitted");
     match source_context {
         SourceContext::Standalone => {
+            extra = None;
             for line in 1..=lines {
-                writeln!(line_numbers, "<span id=\"{0}\">{0}</span>", line)
+                writeln!(line_numbers, "<a href=\"#{line}\" id=\"{line}\">{line}</a>")
             }
         }
-        SourceContext::Embedded { offset } => {
-            for line in 1..=lines {
-                writeln!(line_numbers, "<span>{0}</span>", line + offset)
+        SourceContext::Embedded { offset, needs_expansion } => {
+            extra = if needs_expansion {
+                Some(r#"<button class="expand">&varr;</button>"#)
+            } else {
+                None
+            };
+            for line_number in 1..=lines {
+                let line = line_number + offset;
+                writeln!(line_numbers, "<span>{line}</span>")
             }
         }
     }
     line_numbers.write_str("</pre>");
-    let current_href = &context
-        .href_from_span(clean::Span::new(file_span), false)
-        .expect("only local crates should have sources emitted");
     highlight::render_source_with_highlighting(
         s,
         buf,
         line_numbers,
         highlight::HrefContext { context, file_span, root_path, current_href },
         decoration_info,
+        extra,
     );
 }
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