feat(linter): add hyperlinks to diagnostic messages (#5318)

Adds hyperlinks to diagnostic codes.

Diagnostics without codes will not have links. In practice, this means linter diagnostics have links, while semantic and parser diagnostics do not.

![image.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/OVwvhVoSj4tgQWTUipoY/11790a3a-7dfa-4c6d-be43-550d8b6370a9.png)

> notice the underline under the error code

crates/oxc_diagnostics/src/graphic_reporter.rs

@@ -271,12 +271,24 @@ impl GraphicalReportHandler {
             opts = opts.word_splitter(word_splitter);
         }
 
-        let title = if let Some(code) = diagnostic.code() {
-            format!("{code}: {diagnostic}")
-        } else {
-            diagnostic.to_string()
+        let title = match (self.links, diagnostic.url(), diagnostic.code()) {
+            (LinkStyle::Link, Some(url), Some(code)) => {
+                // magic unicode escape sequences to make the terminal print a hyperlink
+                const CTL: &str = "\u{1b}]8;;";
+                const END: &str = "\u{1b}]8;;\u{1b}\\";
+                let code = code.style(severity_style);
+                let message = diagnostic.to_string();
+                let title = message.style(severity_style);
+                format!("{CTL}{url}\u{1b}\\{code}{END}: {title}",)
+            }
+            (_, _, Some(code)) => {
+                let title = format!("{code}: {}", diagnostic);
+                format!("{}", title.style(severity_style))
+            }
+            _ => {
+                format!("{}", diagnostic.to_string().style(severity_style))
+            }
         };
-        let title = format!("{}", title.style(severity_style));
         let title = textwrap::fill(&title, opts);
         writeln!(f, "{}", title)?;
 

crates/oxc_diagnostics/src/lib.rs

@@ -71,6 +71,7 @@ pub struct OxcDiagnosticInner {
     pub help: Option<Cow<'static, str>>,
     pub severity: Severity,
     pub code: OxcCode,
+    pub url: Option<Cow<'static, str>>,
 }
 
 impl fmt::Display for OxcDiagnostic {
@@ -101,6 +102,9 @@ impl Diagnostic for OxcDiagnostic {
     fn code<'a>(&'a self) -> Option<Box<dyn Display + 'a>> {
         self.code.is_some().then(|| Box::new(&self.code) as Box<dyn Display>)
     }
+    fn url<'a>(&'a self) -> Option<Box<dyn Display + 'a>> {
+        self.url.as_ref().map(Box::new).map(|c| c as Box<dyn Display>)
+    }
 }
 
 impl OxcDiagnostic {
@@ -112,6 +116,7 @@ impl OxcDiagnostic {
                 help: None,
                 severity: Severity::Error,
                 code: OxcCode::default(),
+                url: None,
             }),
         }
     }
@@ -124,6 +129,7 @@ impl OxcDiagnostic {
                 help: None,
                 severity: Severity::Warning,
                 code: OxcCode::default(),
+                url: None,
             }),
         }
     }
@@ -205,6 +211,11 @@ impl OxcDiagnostic {
         self
     }
 
+    pub fn with_url<S: Into<Cow<'static, str>>>(mut self, url: S) -> Self {
+        self.inner.url = Some(url.into());
+        self
+    }
+
     pub fn with_source_code<T: SourceCode + Send + Sync + 'static>(self, code: T) -> Error {
         Error::from(self).with_source_code(code)
     }

crates/oxc_linter/src/context.rs

@@ -41,6 +41,7 @@ pub struct LintContext<'a> {
     eslint_config: Arc<OxlintConfig>,
 
     // states
+    current_plugin_name: &'static str,
     current_plugin_prefix: &'static str,
     current_rule_name: &'static str,
     #[cfg(debug_assertions)]
@@ -60,6 +61,7 @@ pub struct LintContext<'a> {
 }
 
 impl<'a> LintContext<'a> {
+    const WEBSITE_BASE_URL: &'static str = "https://oxc.rs/docs/guide/usage/linter/rules";
     /// # Panics
     /// If `semantic.cfg()` is `None`.
     pub fn new(file_path: Box<Path>, semantic: Rc<Semantic<'a>>) -> Self {
@@ -81,6 +83,7 @@ impl<'a> LintContext<'a> {
             fix: FixKind::None,
             file_path: file_path.into(),
             eslint_config: Arc::new(OxlintConfig::default()),
+            current_plugin_name: "eslint",
             current_plugin_prefix: "eslint",
             current_rule_name: "",
             #[cfg(debug_assertions)]
@@ -102,6 +105,7 @@ impl<'a> LintContext<'a> {
     }
 
     pub fn with_plugin_name(mut self, plugin: &'static str) -> Self {
+        self.current_plugin_name = plugin;
         self.current_plugin_prefix = plugin_name_to_prefix(plugin);
         self
     }
@@ -209,16 +213,24 @@ impl<'a> LintContext<'a> {
         self.diagnostics.borrow().iter().cloned().collect::<Vec<_>>()
     }
 
-    fn add_diagnostic(&self, message: Message<'a>) {
-        if !self.disable_directives.contains(self.current_rule_name, message.span()) {
-            let mut message = message;
-            message.error =
-                message.error.with_error_code(self.current_plugin_prefix, self.current_rule_name);
-            if message.error.severity != self.severity {
-                message.error = message.error.with_severity(self.severity);
-            }
-            self.diagnostics.borrow_mut().push(message);
+    fn add_diagnostic(&self, mut message: Message<'a>) {
+        if self.disable_directives.contains(self.current_rule_name, message.span()) {
+            return;
+        }
+        message.error = message
+            .error
+            .with_error_code(self.current_plugin_prefix, self.current_rule_name)
+            .with_url(format!(
+                "{}/{}/{}.html",
+                Self::WEBSITE_BASE_URL,
+                self.current_plugin_name,
+                self.current_rule_name
+            ));
+        if message.error.severity != self.severity {
+            message.error = message.error.with_severity(self.severity);
         }
+
+        self.diagnostics.borrow_mut().push(message);
     }
 
     /// Report a lint rule violation.

crates/oxc_linter/src/tester.rs

@@ -394,7 +394,9 @@ impl Tester {
         }
         .to_string_lossy();
 
-        let handler = GraphicalReportHandler::new().with_theme(GraphicalTheme::unicode_nocolor());
+        let handler = GraphicalReportHandler::new()
+            .with_links(false)
+            .with_theme(GraphicalTheme::unicode_nocolor());
         for diagnostic in result {
             let diagnostic = diagnostic.error.with_source_code(NamedSource::new(
                 diagnostic_path.clone(),