feat(nested): Render inner diagnostics (#170)

src/handlers/graphical.rs

@@ -3,7 +3,7 @@ use std::fmt::{self, Write};
 use owo_colors::{OwoColorize, Style};
 use unicode_width::UnicodeWidthChar;
 
-use crate::diagnostic_chain::DiagnosticChain;
+use crate::diagnostic_chain::{DiagnosticChain, ErrorKind};
 use crate::handlers::theme::*;
 use crate::protocol::{Diagnostic, Severity};
 use crate::{LabeledSpan, MietteError, ReportHandler, SourceCode, SourceSpan, SpanContents};
@@ -151,7 +151,6 @@ impl GraphicalReportHandler {
         diagnostic: &(dyn Diagnostic),
     ) -> fmt::Result {
         self.render_header(f, diagnostic)?;
-        writeln!(f)?;
         self.render_causes(f, diagnostic)?;
         let src = diagnostic.source_code();
         self.render_snippets(f, diagnostic, src)?;
@@ -190,13 +189,15 @@ impl GraphicalReportHandler {
             );
             write!(header, "{}", link)?;
             writeln!(f, "{}", header)?;
+            writeln!(f)?;
         } else if let Some(code) = diagnostic.code() {
             write!(header, "{}", code.style(severity_style),)?;
             if self.links == LinkStyle::Text && diagnostic.url().is_some() {
                 let url = diagnostic.url().unwrap(); // safe
                 write!(header, " ({})", url.style(self.theme.styles.link))?;
             }
             writeln!(f, "{}", header)?;
+            writeln!(f)?;
         }
         Ok(())
     }
@@ -253,7 +254,22 @@ impl GraphicalReportHandler {
                 let opts = textwrap::Options::new(width)
                     .initial_indent(&initial_indent)
                     .subsequent_indent(&rest_indent);
-                writeln!(f, "{}", textwrap::fill(&error.to_string(), opts))?;
+                match error {
+                    ErrorKind::Diagnostic(diag) => {
+                        let mut inner = String::new();
+
+                        // Don't print footer for inner errors
+                        let mut inner_renderer = self.clone();
+                        inner_renderer.footer = None;
+                        inner_renderer.with_cause_chain = false;
+                        inner_renderer.render_report(&mut inner, diag)?;
+
+                        writeln!(f, "{}", textwrap::fill(&inner, opts))?;
+                    }
+                    ErrorKind::StdError(err) => {
+                        writeln!(f, "{}", textwrap::fill(&err.to_string(), opts))?;
+                    }
+                }
             }
         }
 
@@ -287,7 +303,6 @@ impl GraphicalReportHandler {
                     Some(Severity::Advice) => write!(f, "Advice: ")?,
                 };
                 self.render_header(f, rel)?;
-                writeln!(f)?;
                 self.render_causes(f, rel)?;
                 let src = rel.source_code().or(parent_src);
                 self.render_snippets(f, rel, src)?;

tests/graphical.rs

@@ -85,8 +85,7 @@ fn single_line_highlight_span_full_line() {
     let out = fmt_report(err.into());
     println!("Error: {}", out);
 
-    let expected = r#"
-  × oops!
+    let expected = r#"  × oops!
    ╭─[issue:1:1]
  1 │ source
  2 │ text
@@ -1201,8 +1200,7 @@ fn zero_length_eol_span() {
     let out = fmt_report(err.into());
     println!("Error: {}", out);
 
-    let expected = r#"
-  × oops!
+    let expected = r#"  × oops!
    ╭─[issue:1:1]
  1 │ this is the first line
  2 │ this is the second line

tests/test_diagnostic_source_macro.rs

@@ -1,5 +1,16 @@
 use miette::Diagnostic;
 
+#[derive(Debug, miette::Diagnostic, thiserror::Error)]
+#[error("A complex error happened")]
+struct SourceError {
+    #[source_code]
+    code: String,
+    #[help]
+    help: String,
+    #[label("here")]
+    label: (usize, usize),
+}
+
 #[derive(Debug, miette::Diagnostic, thiserror::Error)]
 #[error("AnErr")]
 struct AnErr;
@@ -8,7 +19,7 @@ struct AnErr;
 #[error("TestError")]
 struct TestStructError {
     #[diagnostic_source]
-    asdf_inner_foo: AnErr,
+    asdf_inner_foo: SourceError,
 }
 
 #[derive(Debug, miette::Diagnostic, thiserror::Error)]
@@ -37,7 +48,11 @@ struct TestArcedError(#[diagnostic_source] std::sync::Arc<dyn Diagnostic>);
 #[test]
 fn test_diagnostic_source() {
     let error = TestStructError {
-        asdf_inner_foo: AnErr,
+        asdf_inner_foo: SourceError {
+            code: String::new(),
+            help: String::new(),
+            label: (0, 0),
+        },
     };
     assert!(error.diagnostic_source().is_some());
 
@@ -59,3 +74,120 @@ fn test_diagnostic_source() {
     let error = TestArcedError(std::sync::Arc::new(AnErr));
     assert!(error.diagnostic_source().is_some());
 }
+
+#[test]
+fn test_diagnostic_source_pass_extra_info() {
+    let diag = TestBoxedError(Box::new(SourceError {
+        code: String::from("Hello\nWorld!"),
+        help: format!("Have you tried turning it on and off again?"),
+        label: (1, 4),
+    }));
+    let mut out = String::new();
+    miette::GraphicalReportHandler::new_themed(miette::GraphicalTheme::unicode_nocolor())
+        .with_width(80)
+        .with_footer("this is a footer".into())
+        .render_report(&mut out, &diag)
+        .unwrap();
+    println!("Error: {}", out);
+    let expected = r#"  × TestError
+  ╰─▶   × A complex error happened
+         ╭─[1:1]
+       1 │ Hello
+         ·  ──┬─
+         ·    ╰── here
+       2 │ World!
+         ╰────
+        help: Have you tried turning it on and off again?
+      
+
+  this is a footer
+"#
+    .to_string();
+    assert_eq!(expected, out);
+}
+
+#[test]
+fn test_diagnostic_source_is_output() {
+    let diag = TestStructError {
+        asdf_inner_foo: SourceError {
+            code: String::from("right here"),
+            help: String::from("That's where the error is!"),
+            label: (6, 4),
+        },
+    };
+    let mut out = String::new();
+    miette::GraphicalReportHandler::new_themed(miette::GraphicalTheme::unicode_nocolor())
+        .with_width(80)
+        .render_report(&mut out, &diag)
+        .unwrap();
+    println!("{}", out);
+
+    let expected = r#"  × TestError
+  ╰─▶   × A complex error happened
+         ╭────
+       1 │ right here
+         ·       ──┬─
+         ·         ╰── here
+         ╰────
+        help: That's where the error is!
+      
+"#;
+
+    assert_eq!(expected, out);
+}
+
+#[derive(Debug, miette::Diagnostic, thiserror::Error)]
+#[error("A nested error happened")]
+struct NestedError {
+    #[source_code]
+    code: String,
+    #[label("here")]
+    label: (usize, usize),
+    #[diagnostic_source]
+    the_other_err: Box<dyn Diagnostic>,
+}
+
+#[test]
+fn test_nested_diagnostic_source_is_output() {
+    let inner_error = TestStructError {
+        asdf_inner_foo: SourceError {
+            code: String::from("This is another error"),
+            help: String::from("You should fix this"),
+            label: (3, 4),
+        },
+    };
+    let diag = NestedError {
+        code: String::from("right here"),
+        label: (6, 4),
+        the_other_err: Box::new(inner_error),
+    };
+    let mut out = String::new();
+    miette::GraphicalReportHandler::new_themed(miette::GraphicalTheme::unicode_nocolor())
+        .with_width(80)
+        .with_footer("Yooo, a footer".to_string())
+        .render_report(&mut out, &diag)
+        .unwrap();
+    println!("{}", out);
+
+    let expected = r#"  × A nested error happened
+  ├─▶   × TestError
+  │   
+  ╰─▶   × A complex error happened
+         ╭────
+       1 │ This is another error
+         ·    ──┬─
+         ·      ╰── here
+         ╰────
+        help: You should fix this
+      
+   ╭────
+ 1 │ right here
+   ·       ──┬─
+   ·         ╰── here
+   ╰────
+
+  Yooo, a footer
+"#;
+
+    assert_eq!(expected, out);
+}