feat(graphical): add support for stylization on titles

src/handlers/graphical.rs

@@ -351,7 +351,8 @@ impl GraphicalReportHandler {
             opts = opts.word_splitter(word_splitter);
         }
 
-        writeln!(f, "{}", self.wrap(&diagnostic.to_string(), opts))?;
+        let styled = diagnostic.style(self.theme.styles.title).to_string();
+        writeln!(f, "{}", self.wrap(&styled, opts))?;
 
         if !self.with_cause_chain {
             return Ok(());

src/handlers/theme.rs

@@ -85,6 +85,8 @@ Styles for various parts of graphical rendering for the
 */
 #[derive(Debug, Clone)]
 pub struct ThemeStyles {
+    /// Style to apply to the title.
+    pub title: Style,
     /// Style to apply to things highlighted as "error".
     pub error: Style,
     /// Style to apply to things highlighted as "warning".
@@ -111,6 +113,7 @@ impl ThemeStyles {
     /// [Credit](http://terminal.sexy/#FRUV0NDQFRUVrEFCkKlZ9L91ap-1qnWfdbWq0NDQUFBQrEFCkKlZ9L91ap-1qnWfdbWq9fX1).
     pub fn rgb() -> Self {
         Self {
+            title: style(),
             error: style().fg_rgb::<255, 30, 30>(),
             warning: style().fg_rgb::<244, 191, 117>(),
             advice: style().fg_rgb::<106, 159, 181>(),
@@ -128,6 +131,7 @@ impl ThemeStyles {
     /// ANSI color-based styles.
     pub fn ansi() -> Self {
         Self {
+            title: style(),
             error: style().red(),
             warning: style().yellow(),
             advice: style().cyan(),
@@ -145,6 +149,7 @@ impl ThemeStyles {
     /// No styling. Just regular ol' monochrome.
     pub fn none() -> Self {
         Self {
+            title: style(),
             error: style(),
             warning: style(),
             advice: style(),

tests/graphical.rs

@@ -2030,6 +2030,24 @@ fn syntax_highlighter_on_real_file() {
     assert_eq!(expected, strip_ansi_escapes::strip_str(out));
 }
 
+#[test]
+fn title_style_is_applied() {
+    use miette::{GraphicalReportHandler, GraphicalTheme, Report, ThemeCharacters, ThemeStyles};
+
+    let theme = GraphicalTheme {
+        characters: ThemeCharacters::unicode(),
+        styles: ThemeStyles {
+            title: owo_colors::Style::new().bold(),
+            ..ThemeStyles::none()
+        },
+    };
+    let mut out = String::new();
+    GraphicalReportHandler::new_themed(theme)
+        .render_report(&mut out, Report::msg("hello").as_ref())
+        .unwrap();
+    assert_eq!(out, "  × \u{1b}[1mhello\u{1b}[0m\n",);
+}
+
 #[test]
 fn triple_adjacent_highlight() -> Result<(), MietteError> {
     #[derive(Debug, Diagnostic, Error)]