feat(viewer): add h and ? as help keys alongside F1

README.md

@@ -106,7 +106,7 @@ mdterm README.md | less -R
 | `Y` | Copy entire document to clipboard |
 | `c` | Copy nearest code block to clipboard |
 | `Tab` / `Shift+Tab` | Switch between files |
-| `F1` | Help screen |
+| `h` / `?` / `F1` | Help screen |
 | `q` / `Ctrl+C` | Quit |
 
 ### Slide Mode (`--slides`)

src/image.rs

@@ -2471,10 +2471,8 @@ mod tests {
         let addr = listener.local_addr().ok()?;
         let base = format!("http://127.0.0.1:{}", addr.port());
         std::thread::spawn(move || {
-            for stream in listener.incoming() {
-                if let Ok(stream) = stream {
-                    let _ = (handler)(stream);
-                }
+            for stream in listener.incoming().flatten() {
+                (handler)(stream);
             }
         });
         Some((base, addr))
@@ -2511,9 +2509,8 @@ mod tests {
             let n = stream.read(&mut buf).unwrap_or(0);
             let req = String::from_utf8_lossy(&buf[..n]);
             if req.contains("GET /redirect") {
-                let resp = format!(
-                    "HTTP/1.1 302 Found\r\nLocation: /image.png\r\nContent-Length: 0\r\n\r\n"
-                );
+                let resp =
+                    "HTTP/1.1 302 Found\r\nLocation: /image.png\r\nContent-Length: 0\r\n\r\n";
                 let _ = stream.write_all(resp.as_bytes());
             } else {
                 let body = png.clone();

src/markdown.rs

@@ -574,8 +574,8 @@ impl<'a> Renderer<'a> {
                     flex_remaining -= 1;
                     if flex_remaining == 0 {
                         *w = remaining;
-                    } else if flex_natural > 0 {
-                        let share = (*w * flex_available / flex_natural).max(3);
+                    } else if let Some(share) = (*w * flex_available).checked_div(flex_natural) {
+                        let share = share.max(3);
                         *w = share;
                         remaining = remaining.saturating_sub(share);
                     }
@@ -1733,7 +1733,7 @@ mod tests {
     fn unordered_list_has_bullets() {
         let input = "- item one\n- item two";
         let (lines, _) = render_test(input);
-        let texts: Vec<String> = lines.iter().map(|l| line_text(l)).collect();
+        let texts: Vec<String> = lines.iter().map(line_text).collect();
         let bullet_lines: Vec<_> = texts.iter().filter(|t| t.contains('•')).collect();
         assert_eq!(bullet_lines.len(), 2);
     }
@@ -1742,7 +1742,7 @@ mod tests {
     fn ordered_list_has_numbers() {
         let input = "1. first\n2. second";
         let (lines, _) = render_test(input);
-        let texts: Vec<String> = lines.iter().map(|l| line_text(l)).collect();
+        let texts: Vec<String> = lines.iter().map(line_text).collect();
         assert!(texts.iter().any(|t| t.contains("1.")));
         assert!(texts.iter().any(|t| t.contains("2.")));
     }
@@ -1753,7 +1753,7 @@ mod tests {
     fn blockquote_produces_styled_output() {
         let input = "> quoted text";
         let (lines, _) = render_test(input);
-        let texts: Vec<String> = lines.iter().map(|l| line_text(l)).collect();
+        let texts: Vec<String> = lines.iter().map(line_text).collect();
         assert!(texts.iter().any(|t| t.contains("quoted text")));
     }
 

src/style.rs

@@ -311,7 +311,7 @@ mod tests {
             assert!(line.display_width() <= 4);
         }
         // All characters preserved
-        let all: String = wrapped.iter().map(|l| line_text(l)).collect();
+        let all: String = wrapped.iter().map(line_text).collect();
         assert_eq!(all, "abcdefghij");
     }
 
@@ -419,7 +419,7 @@ mod tests {
                 line.display_width()
             );
         }
-        let all: String = wrapped.iter().map(|l| line_text(l)).collect();
+        let all: String = wrapped.iter().map(line_text).collect();
         assert_eq!(all, "你好世界测试");
     }
 
@@ -435,7 +435,7 @@ mod tests {
         for line in &wrapped {
             assert!(line.display_width() <= 4);
         }
-        let all: String = wrapped.iter().map(|l| line_text(l)).collect();
+        let all: String = wrapped.iter().map(line_text).collect();
         assert_eq!(all, "🎉🎊🎈");
     }
 
@@ -467,7 +467,7 @@ mod tests {
             "first span should preserve bold style"
         );
         // All text should be preserved across wrapped lines
-        let all_text: String = wrapped.iter().map(|l| line_text(l)).collect();
+        let all_text: String = wrapped.iter().map(line_text).collect();
         assert!(all_text.contains("bold"));
         assert!(all_text.contains("normal"));
         assert!(all_text.contains("text"));