Fix more clippy warnings

src/hunks.rs

@@ -683,7 +683,7 @@ pub fn matched_lines_for_hunk(
         end_i = matched_lines.len();
     }
 
-    matched_lines[start_i..end_i].iter().copied().collect()
+    matched_lines[start_i..end_i].to_vec()
 }
 
 #[cfg(test)]

src/inline.rs

@@ -73,7 +73,7 @@ pub fn print(
             if let Some(lhs_line) = lhs_line {
                 println!(
                     "{}   {}",
-                    format_line_num(*lhs_line).red().bold().to_string(),
+                    format_line_num(*lhs_line).red().bold(),
                     lhs_lines[lhs_line.0]
                 );
             } else {
@@ -84,7 +84,7 @@ pub fn print(
             if let Some(rhs_line) = rhs_line {
                 println!(
                     "   {}{}",
-                    format_line_num(*rhs_line).green().bold().to_string(),
+                    format_line_num(*rhs_line).green().bold(),
                     rhs_lines[rhs_line.0]
                 );
             } else {

src/main.rs

@@ -201,10 +201,10 @@ fn diff_file_content(
     // TODO: don't replace tab characters inside string literals.
     let lhs_src = String::from_utf8_lossy(lhs_bytes)
         .to_string()
-        .replace("\t", "    ");
+        .replace('\t', "    ");
     let rhs_src = String::from_utf8_lossy(rhs_bytes)
         .to_string()
-        .replace("\t", "    ");
+        .replace('\t', "    ");
 
     // TODO: take a Path directly instead.
     let path = Path::new(&display_path);

src/style.rs

@@ -240,8 +240,9 @@ pub fn color_positions(
     for pos in positions {
         let mut style = Style::new();
         match pos.kind {
-            MatchKind::UnchangedToken { highlight, .. } => match highlight {
+            MatchKind::UnchangedToken { highlight, .. } => {
-                TokenKind::Atom(atom_kind) => match atom_kind {
+                if let TokenKind::Atom(atom_kind) = highlight {
+                    match atom_kind {
                         AtomKind::String => {
                             style = if background.is_dark() {
                                 style.bright_magenta()
@@ -261,19 +262,19 @@ pub fn color_positions(
                             style = style.bold();
                         }
                         _ => {}
-                },
+                    }
-                _ => {}
+                }
-            },
+            }
             MatchKind::Novel { highlight, .. } => {
                 style = novel_style(style, is_lhs, background);
-                match highlight {
+                if matches!(
+                    highlight,
                     TokenKind::Delimiter
                         | TokenKind::Atom(AtomKind::Keyword)
-                    | TokenKind::Atom(AtomKind::Type) => {
+                        | TokenKind::Atom(AtomKind::Type)
+                ) {
                     style = style.bold();
                 }
-                    _ => {}
-                }
                 if matches!(highlight, TokenKind::Atom(AtomKind::Comment)) {
                     style = style.italic();
                 }