Merge #5682

5682: Add an option to disable diagnostics r=matklad a=popzxc

As far as I know, currently it's not possible to disable a selected type of diagnostics provided by `rust-analyzer`.

This causes an inconvenient situation with a false-positive warnings: you either have to disable all the diagnostics, or you have to ignore these warnings.

There are some open issues related to this problem, e.g.: https://github.com/rust-analyzer/rust-analyzer/issues/5412, https://github.com/rust-analyzer/rust-analyzer/issues/5502

This PR attempts to make it possible to selectively disable some diagnostics on per-project basis.

Co-authored-by: Igor Aleksanov <popzxc@yandex.ru>

crates/rust-analyzer/src/cli/analysis_bench.rs

@@ -71,7 +71,7 @@ impl BenchCmd {
         match &self.what {
             BenchWhat::Highlight { .. } => {
                 let res = do_work(&mut host, file_id, |analysis| {
-                    analysis.diagnostics(file_id, true).unwrap();
+                    analysis.diagnostics(file_id, true, None).unwrap();
                     analysis.highlight_as_html(file_id, false).unwrap()
                 });
                 if verbosity.is_verbose() {

crates/rust-analyzer/src/cli/diagnostics.rs

@@ -47,7 +47,7 @@ pub fn diagnostics(
                 String::from("unknown")
             };
             println!("processing crate: {}, module: {}", crate_name, _vfs.file_path(file_id));
-            for diagnostic in analysis.diagnostics(file_id, true).unwrap() {
+            for diagnostic in analysis.diagnostics(file_id, true, None).unwrap() {
                 if matches!(diagnostic.severity, Severity::Error) {
                     found_error = true;
                 }

crates/rust-analyzer/src/config.rs

@@ -7,7 +7,7 @@
 //! configure the server itself, feature flags are passed into analysis, and
 //! tweak things like automatic insertion of `()` in completions.
 
-use std::{ffi::OsString, path::PathBuf};
+use std::{collections::HashSet, ffi::OsString, path::PathBuf};
 
 use flycheck::FlycheckConfig;
 use ide::{AssistConfig, CompletionConfig, HoverConfig, InlayHintsConfig};
@@ -45,6 +45,14 @@ pub struct Config {
     pub with_sysroot: bool,
     pub linked_projects: Vec<LinkedProject>,
     pub root_path: AbsPathBuf,
+
+    pub analysis: AnalysisConfig,
+}
+
+/// Configuration parameters for the analysis run.
+#[derive(Debug, Default, Clone)]
+pub struct AnalysisConfig {
+    pub disabled_diagnostics: HashSet<String>,
 }
 
 #[derive(Debug, Clone, Eq, PartialEq)]
@@ -176,6 +184,8 @@ impl Config {
             hover: HoverConfig::default(),
             linked_projects: Vec::new(),
             root_path,
+
+            analysis: AnalysisConfig::default(),
         }
     }
 
@@ -293,6 +303,8 @@ impl Config {
             goto_type_def: data.hoverActions_enable && data.hoverActions_gotoTypeDef,
         };
 
+        self.analysis = AnalysisConfig { disabled_diagnostics: data.analysis_disabledDiagnostics };
+
         log::info!("Config::update() = {:#?}", self);
     }
 
@@ -357,6 +369,14 @@ impl Config {
             self.client_caps.status_notification = get_bool("statusNotification");
         }
     }
+
+    pub fn disabled_diagnostics(&self) -> Option<HashSet<String>> {
+        if self.analysis.disabled_diagnostics.is_empty() {
+            None
+        } else {
+            Some(self.analysis.disabled_diagnostics.clone())
+        }
+    }
 }
 
 #[derive(Deserialize)]
@@ -444,5 +464,7 @@ config_data! {
         rustfmt_overrideCommand: Option<Vec<String>> = None,
 
         withSysroot: bool = true,
+
+        analysis_disabledDiagnostics: HashSet<String> = HashSet::new(),
     }
 }

crates/rust-analyzer/src/handlers.rs

@@ -775,7 +775,11 @@ fn handle_fixes(
         None => {}
     };
 
-    let diagnostics = snap.analysis.diagnostics(file_id, snap.config.experimental_diagnostics)?;
+    let diagnostics = snap.analysis.diagnostics(
+        file_id,
+        snap.config.experimental_diagnostics,
+        snap.config.disabled_diagnostics(),
+    )?;
 
     for fix in diagnostics
         .into_iter()
@@ -1049,7 +1053,11 @@ pub(crate) fn publish_diagnostics(
     let line_index = snap.analysis.file_line_index(file_id)?;
     let diagnostics: Vec<Diagnostic> = snap
         .analysis
-        .diagnostics(file_id, snap.config.experimental_diagnostics)?
+        .diagnostics(
+            file_id,
+            snap.config.experimental_diagnostics,
+            snap.config.disabled_diagnostics(),
+        )?
         .into_iter()
         .map(|d| Diagnostic {
             range: to_proto::range(&line_index, d.range),