Allow fully overriding check and fmt commands

Author: matklad

crates/rust-analyzer/src/config.rs

@@ -133,13 +133,30 @@ impl Config {
         set(value, "/cargo/allFeatures", &mut self.cargo.all_features);
         set(value, "/cargo/features", &mut self.cargo.features);
         set(value, "/cargo/loadOutDirsFromCheck", &mut self.cargo.load_out_dirs_from_check);
-        if let RustfmtConfig::Rustfmt { extra_args } = &mut self.rustfmt {
+        if let Some(mut args) = get::<Vec<String>>(value, "/rustfmt/overrideCommand") {
+            if !args.is_empty() {
+                let command = args.remove(0);
+                self.rustfmt = RustfmtConfig::CustomCommand {
+                    command,
+                    args,
+                }
+            }
+        } else if let RustfmtConfig::Rustfmt { extra_args } = &mut self.rustfmt {
             set(value, "/rustfmt/extraArgs", extra_args);
         }
         if let Some(false) = get(value, "/checkOnSave/enable") {
             self.check = None
         } else {
-            if let Some(FlycheckConfig::CargoCommand { command, extra_args, all_targets }) = &mut self.check
+            if let Some(mut args) = get::<Vec<String>>(value, "/checkOnSave/overrideCommand") {
+                if !args.is_empty() {
+                    let command = args.remove(0);
+                    self.check = Some(FlycheckConfig::CustomCommand {
+                        command,
+                        args,
+                    })
+                }
+
+            } else if let Some(FlycheckConfig::CargoCommand { command, extra_args, all_targets }) = &mut self.check
             {
                 set(value, "/checkOnSave/extraArgs", extra_args);
                 set(value, "/checkOnSave/command", command);

editors/code/package.json

@@ -248,6 +248,13 @@
                     "default": [],
                     "description": "Additional arguments to rustfmt"
                 },
+                "rust-analyzer.rustfmt.overrideCommand": {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    },
+                    "markdownDescription": "Advanced option, fully override the command rust-analyzer uses for formatting."
+                },
                 "rust-analyzer.checkOnSave.enable": {
                     "type": "boolean",
                     "default": true,
@@ -266,6 +273,13 @@
                     "default": "check",
                     "markdownDescription": "Cargo command to use for `cargo check`"
                 },
+                "rust-analyzer.checkOnSave.overrideCommand": {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    },
+                    "markdownDescription": "Advanced option, fully override the command rust-analyzer uses for checking. The command must include `--message=format=json`."
+                },
                 "rust-analyzer.checkOnSave.allTargets": {
                     "type": "boolean",
                     "default": true,