feat(footer): add footer support to graphical and narrated

Fixes: https://github.com/zkat/miette/issues/34

src/handler.rs

@@ -24,6 +24,7 @@ pub struct MietteHandlerOpts {
     pub(crate) rgb_colors: Option<bool>,
     pub(crate) color: Option<bool>,
     pub(crate) unicode: Option<bool>,
+    pub(crate) footer: Option<String>,
 }
 
 impl MietteHandlerOpts {
@@ -92,13 +93,23 @@ impl MietteHandlerOpts {
         self
     }
 
+    /// Set a footer to be displayed at the bottom of the report.
+    pub fn footer(mut self, footer: String) -> Self {
+        self.footer = Some(footer);
+        self
+    }
+
     /// Builds a [MietteHandler] from this builder.
     pub fn build(self) -> MietteHandler {
         let graphical = self.is_graphical();
         let width = self.get_width();
         if !graphical {
+            let mut handler = NarratableReportHandler::new();
+            if let Some(footer) = self.footer {
+                handler = handler.with_footer(footer);
+            }
             MietteHandler {
-                inner: Box::new(NarratableReportHandler::new()),
+                inner: Box::new(handler),
             }
         } else {
             let linkify = self.use_links();
@@ -123,13 +134,15 @@ impl MietteHandlerOpts {
             } else {
                 ThemeStyles::none()
             };
+            let mut handler = GraphicalReportHandler::new()
+                .with_width(width)
+                .with_links(linkify)
+                .with_theme(GraphicalTheme { characters, styles });
+            if let Some(footer) = self.footer {
+                handler = handler.with_footer(footer);
+            }
             MietteHandler {
-                inner: Box::new(
-                    GraphicalReportHandler::new()
-                        .with_width(width)
-                        .with_links(linkify)
-                        .with_theme(GraphicalTheme { characters, styles }),
-                ),
+                inner: Box::new(handler),
             }
         }
     }

src/handlers/graphical.rs

@@ -24,6 +24,7 @@ pub struct GraphicalReportHandler {
     pub(crate) linkify_code: bool,
     pub(crate) termwidth: usize,
     pub(crate) theme: GraphicalTheme,
+    pub(crate) footer: Option<String>,
 }
 
 impl GraphicalReportHandler {
@@ -34,6 +35,7 @@ impl GraphicalReportHandler {
             linkify_code: true,
             termwidth: 200,
             theme: GraphicalTheme::default(),
+            footer: None,
         }
     }
 
@@ -43,6 +45,7 @@ impl GraphicalReportHandler {
             linkify_code: true,
             termwidth: 200,
             theme,
+            footer: None,
         }
     }
 
@@ -63,6 +66,12 @@ impl GraphicalReportHandler {
         self.termwidth = width;
         self
     }
+
+    /// Sets the "global" footer for this handler.
+    pub fn with_footer(mut self, footer: String) -> Self {
+        self.footer = Some(footer);
+        self
+    }
 }
 
 impl Default for GraphicalReportHandler {
@@ -204,6 +213,14 @@ impl GraphicalReportHandler {
                 .subsequent_indent("        ");
             writeln!(f, "{}", textwrap::fill(&help.to_string(), opts))?;
         }
+        if let Some(footer) = &self.footer {
+            writeln!(f)?;
+            let width = self.termwidth.saturating_sub(4);
+            let opts = textwrap::Options::new(width)
+                .initial_indent("  ")
+                .subsequent_indent("  ");
+            writeln!(f, "{}", textwrap::fill(footer, opts))?;
+        }
         Ok(())
     }
 

src/handlers/narratable.rs

@@ -10,13 +10,21 @@ It's optimized for screen readers and braille users, but is also used in any
 non-graphical environments, such as non-TTY output.
 */
 #[derive(Debug, Clone)]
-pub struct NarratableReportHandler;
+pub struct NarratableReportHandler {
+    footer: Option<String>,
+}
 
 impl NarratableReportHandler {
     /// Create a new [NarratableReportHandler]. There are no customization
     /// options.
     pub fn new() -> Self {
-        Self
+        Self { footer: None}
+    }
+
+    /// Set the footer to be displayed at the end of the report.
+    pub fn with_footer(mut self, footer: String) -> Self {
+        self.footer = Some(footer);
+        self
     }
 }
 

tests/narrated.rs

@@ -17,7 +17,7 @@ fn fmt_report(diag: Report) -> String {
             .render_report(&mut out, diag.as_ref())
             .unwrap();
     } else {
-        NarratableReportHandler
+        NarratableReportHandler::new()
             .render_report(&mut out, diag.as_ref())
             .unwrap();
     };

tests/printer.rs

@@ -12,10 +12,11 @@ fn fmt_report(diag: Report) -> String {
     if std::env::var("STYLE").is_ok() {
         GraphicalReportHandler::new_themed(GraphicalTheme::unicode())
             .with_width(80)
+            .with_footer("this is a footer".into())
             .render_report(&mut out, diag.as_ref())
             .unwrap();
     } else if std::env::var("NARRATED").is_ok() {
-        NarratableReportHandler
+        NarratableReportHandler::new()
             .render_report(&mut out, diag.as_ref())
             .unwrap();
     } else {