feat(lsp): configurable diagnostic severity (#1325)

* feat(lsp): configurable diagnostic severity

Allow severity of diagnostic messages to be configured.
E.g. allow turning of Hint level diagnostics.

Fixes: https://github.com/helix-editor/helix/issues/1007

* Use language_config() method

* Add documentation for diagnostic_severity

* Use unreachable for unknown severity level

* fix: documentation for diagnostic_severity config

1 files changed, 22 insertions, 9 deletions

diff --git a/helix-term/src/application.rs b/helix-term/src/application.rs
index 9a46a7fe..c7202feb 100644
--- a/helix-term/src/application.rs
+++ b/helix-term/src/application.rs
@@ -378,6 +378,7 @@ impl Application {
                         let doc = self.editor.document_by_path_mut(&path);
 
                         if let Some(doc) = doc {
+                            let lang_conf = doc.language_config();
                             let text = doc.text();
 
                             let diagnostics = params
@@ -415,19 +416,31 @@ impl Application {
                                         return None;
                                     };
 
+                                    let severity =
+                                        diagnostic.severity.map(|severity| match severity {
+                                            DiagnosticSeverity::ERROR => Error,
+                                            DiagnosticSeverity::WARNING => Warning,
+                                            DiagnosticSeverity::INFORMATION => Info,
+                                            DiagnosticSeverity::HINT => Hint,
+                                            severity => unreachable!(
+                                                "unrecognized diagnostic severity: {:?}",
+                                                severity
+                                            ),
+                                        });
+
+                                    if let Some(lang_conf) = lang_conf {
+                                        if let Some(severity) = severity {
+                                            if severity < lang_conf.diagnostic_severity {
+                                                return None;
+                                            }
+                                        }
+                                    };
+
                                     Some(Diagnostic {
                                         range: Range { start, end },
                                         line: diagnostic.range.start.line as usize,
                                         message: diagnostic.message,
-                                        severity: diagnostic.severity.map(
-                                            |severity| match severity {
-                                                DiagnosticSeverity::ERROR => Error,
-                                                DiagnosticSeverity::WARNING => Warning,
-                                                DiagnosticSeverity::INFORMATION => Info,
-                                                DiagnosticSeverity::HINT => Hint,
-                                                severity => unimplemented!("{:?}", severity),
-                                            },
-                                        ),
+                                        severity,
                                         // code
                                         // source
                                     })