Added "rust.rustup.nightlyToolchain".

doc/common_configuration_parameters.md

@@ -10,3 +10,8 @@ This configuration parameter specifies which toolchain the extension will invoke
 It is used for getting sysroot, installing components, invoking Cargo
 
 However there are few exceptions. Currently RLS is available for nightly hence RLS and rust-analysis are installed for the nightly toolchain.
+
+### nightlyToolchain
+
+This configuration parameter specifies which toolchain the extension will invoke rustup with.
+It is used for installing RLS and related stuff.

package.json

@@ -477,6 +477,14 @@
                 "string",
                 "null"
               ]
+            },
+            "nightlyToolchain": {
+              "default": null,
+              "description": "The nightly toolchain to use for installing RLS and related components and running RLS",
+              "type": [
+                "string",
+                "null"
+              ]
             }
           }
         },

src/components/configuration/RlsConfiguration.ts

@@ -27,6 +27,13 @@ export class RlsConfiguration {
         return new RlsConfiguration(rustup, rustSource, executableUserPath);
     }
 
+    /**
+     * Returns if there is some executable path specified by the user
+     */
+    public isExecutableUserPathSet(): boolean {
+        return this._executableUserPath !== undefined;
+    }
+
     /**
      * Returns a path to RLS executable
      */
@@ -47,7 +54,12 @@ export class RlsConfiguration {
         // When the user specifies some executable path, the user expects the extension not to add
         // some arguments
         if (this._executableUserPath === undefined && this._rustup && this._rustup.isRlsInstalled()) {
-            return ['run', 'nightly', 'rls'].concat(this._userArgs);
+            const userToolchain = this._rustup.getUserNightlyToolchain();
+            if (!userToolchain) {
+                // It is actually impossible because `isRlsInstalled` uses `getUserNightlyToolchain`
+                return this._userArgs;
+            }
+            return ['run', userToolchain.toString(true, false), 'rls'].concat(this._userArgs);
         } else {
             return this._userArgs;
         }

src/components/configuration/Rustup.ts

@@ -27,12 +27,6 @@ export class Rustup {
      */
     private pathToRustSourceCode: string | undefined;
 
-    /**
-     * A path to the executable of RLS.
-     * It can be undefined if the component "rls" is not installed
-     */
-    private pathToRlsExecutable: string | undefined;
-
     /**
      * Components received by invoking rustup
      */
@@ -48,6 +42,10 @@ export class Rustup {
      */
     private _userToolchain: Toolchain | undefined;
 
+    /**
+     * The nightly toolchain chosen by the user
+     */
+    private _userNightlyToolchain: Toolchain | undefined;
 
     /**
      * Returns the executable of Rustup
@@ -70,26 +68,6 @@ export class Rustup {
         return rustup;
     }
 
-    /**
-     * Return either the only nightly toolchain or undefined if there is no nightly toolchain or
-     * there are several nightly toolchains
-     */
-    public getNightlyToolchain(logger: ChildLogger): Toolchain | undefined {
-        const functionLogger = logger.createChildLogger('getNightlyToolchain: ');
-        const nightlyToolchains = this.getNightlyToolchains();
-        switch (nightlyToolchains.length) {
-            case 0:
-                functionLogger.error('There is no nightly toolchain');
-                return undefined;
-            case 1:
-                functionLogger.debug('There is only one nightly toolchain');
-                return nightlyToolchains[0];
-            default:
-                functionLogger.debug(`There are ${nightlyToolchains.length} nightly toolchains`);
-                return undefined;
-        }
-    }
-
     /**
      * Returns either the default toolchain or undefined if there are no installed toolchains
      */
@@ -109,6 +87,10 @@ export class Rustup {
         return this.toolchains;
     }
 
+    public getNightlyToolchains(): Toolchain[] {
+        return this.toolchains.filter(t => t.channel === 'nightly');
+    }
+
     /**
      * Checks if the toolchain is installed
      * @param toolchain The toolchain to check
@@ -125,10 +107,24 @@ export class Rustup {
     }
 
     /**
-     * Returns either the path to the executable of RLS or undefined
+     * Returns either the nightly toolchain chosen by the user or undefined
      */
-    public getPathToRlsExecutable(): string | undefined {
-        return this.pathToRlsExecutable;
+    public getUserNightlyToolchain(): Toolchain | undefined {
+        return this._userNightlyToolchain;
+    }
+
+    /**
+     * Sets the new value of the nightly toolchain in the object and in the configuration
+     * @param toolchain The new value
+     */
+    public setUserNightlyToolchain(toolchain: Toolchain | undefined): void {
+        if (this._userNightlyToolchain === toolchain) {
+            return;
+        }
+        this._userNightlyToolchain = toolchain;
+        updateUserConfigurationParameter(c => {
+            c.nightlyToolchain = toolchain ? toolchain.toString(true, false) : null;
+        });
     }
 
     /**
@@ -143,7 +139,9 @@ export class Rustup {
             return;
         }
         this._userToolchain = toolchain;
-        updateUserConfigurationParameter(c => c.toolchain = toolchain ? toolchain.toString(true, false) : null);
+        updateUserConfigurationParameter(c => {
+            c.toolchain = toolchain ? toolchain.toString(true, false) : null;
+        });
     }
 
     /**
@@ -188,7 +186,7 @@ export class Rustup {
      */
     public async installRls(): Promise<boolean> {
         const logger = this.logger.createChildLogger('installRls: ');
-        const nightlyToolchain = this.getNightlyToolchain(logger);
+        const nightlyToolchain = this.getUserNightlyToolchain();
         if (!nightlyToolchain) {
             logger.error('no nightly toolchain');
             return false;
@@ -197,17 +195,7 @@ export class Rustup {
             nightlyToolchain,
             Rustup.getRlsComponentName()
         );
-        if (!isComponentInstalled) {
-            return false;
-        }
-        // We need to update the field
-        await this.updatePathToRlsExecutable();
-        if (!this.pathToRlsExecutable) {
-            logger.error('RLS had been installed successfully, but we failed to find it in PATH. This should have not happened');
-
-            return false;
-        }
-        return true;
+        return isComponentInstalled;
     }
 
     /**
@@ -216,7 +204,7 @@ export class Rustup {
      */
     public async installRustAnalysis(): Promise<boolean> {
         const logger = this.logger.createChildLogger('installRustAnalysis: ');
-        const nightlyToolchain = this.getNightlyToolchain(logger);
+        const nightlyToolchain = this.getUserNightlyToolchain();
         if (!nightlyToolchain) {
             logger.error('no nightly toolchain');
             return false;
@@ -291,31 +279,13 @@ export class Rustup {
         }
     }
 
-    /**
-     * Checks if the executable of RLS is installed.
-     * This method assigns either a path to the executable or undefined to the field `pathToRlsExecutable`, depending on if the executable is found
-     * This method is asynchronous because it checks if the executable exists
-     */
-    public async updatePathToRlsExecutable(): Promise<void> {
-        const logger = this.logger.createChildLogger('updatePathToRlsExecutable: ');
-        this.pathToRlsExecutable = undefined;
-        const rlsPath: string | undefined = await FileSystem.findExecutablePath('rls');
-        logger.debug(`rlsPath=${rlsPath}`);
-        if (!rlsPath) {
-            // RLS is installed via Rustup, but isn't found. Let a user know about it
-            logger.error(`Rustup had reported that RLS had been installed, but RLS wasn't found in PATH=${process.env.PATH}`);
-            return;
-        }
-        this.pathToRlsExecutable = rlsPath;
-    }
-
     /**
      * Requests Rustup give a list of components, parses it, checks if RLS is present in the list and returns if it is
      * @returns true if RLS can be installed otherwise false
      */
     public canInstallRls(): boolean {
         const logger = this.logger.createChildLogger('canInstallRls: ');
-        const nightlyToolchain = this.getNightlyToolchain(logger);
+        const nightlyToolchain = this.getUserNightlyToolchain();
         if (!nightlyToolchain) {
             logger.error('no nightly toolchain');
             return false;
@@ -343,7 +313,7 @@ export class Rustup {
      */
     public isRlsInstalled(): boolean {
         const logger = this.logger.createChildLogger('isRlsInstalled: ');
-        const nightlyToolchain = this.getNightlyToolchain(logger);
+        const nightlyToolchain = this.getUserNightlyToolchain();
         if (!nightlyToolchain) {
             logger.error('no nightly toolchain');
             return false;
@@ -357,7 +327,7 @@ export class Rustup {
      */
     public isRustAnalysisInstalled(): boolean {
         const logger = this.logger.createChildLogger('isRustAnalysisInstalled: ');
-        const nightlyToolchain = this.getNightlyToolchain(logger);
+        const nightlyToolchain = this.getUserNightlyToolchain();
         if (!nightlyToolchain) {
             logger.error('no nightly toolchain');
             return false;
@@ -371,7 +341,7 @@ export class Rustup {
      */
     public canInstallRustAnalysis(): boolean {
         const logger = this.logger.createChildLogger('canInstallRustAnalysis: ');
-        const nightlyToolchain = this.getNightlyToolchain(logger);
+        const nightlyToolchain = this.getUserNightlyToolchain();
         if (!nightlyToolchain) {
             logger.error('no nightly toolchain');
             return false;
@@ -502,20 +472,15 @@ export class Rustup {
      * @param logger A value for the field `logger`
      * @param pathToRustcSysRoot A value for the field `pathToRustcSysRoot`
      * @param pathToRustSourceCode A value for the field `pathToRustSourceCode`
-     * @param pathToRlsExecutable A value fo the field `pathToRlsExecutable`
      */
     private constructor(logger: ChildLogger) {
         this.logger = logger;
         this.pathToRustcSysRoot = undefined;
         this.pathToRustSourceCode = undefined;
-        this.pathToRlsExecutable = undefined;
         this.components = {};
         this.toolchains = [];
         this._userToolchain = getUserToolchain();
-    }
-
-    private getNightlyToolchains(): Toolchain[] {
-        return this.toolchains.filter(t => t.channel === 'nightly');
+        this._userNightlyToolchain = getUserNightlyToolchain();
     }
 
     /**
@@ -580,12 +545,12 @@ function getUserConfiguration(): any {
     return rustupConfiguration;
 }
 
-function getUserToolchain(): Toolchain | undefined {
+function getToolchainFromConfigurationParameter(parameter: string): Toolchain | undefined {
     const rustupConfiguration = getUserConfiguration();
     if (!rustupConfiguration) {
         return undefined;
     }
-    const toolchainAsString = rustupConfiguration.toolchain;
+    const toolchainAsString = rustupConfiguration[parameter];
     if (!toolchainAsString) {
         return undefined;
     }
@@ -597,6 +562,14 @@ function getUserToolchain(): Toolchain | undefined {
     }
 }
 
+function getUserNightlyToolchain(): Toolchain | undefined {
+    return getToolchainFromConfigurationParameter('nightlyToolchain');
+}
+
+function getUserToolchain(): Toolchain | undefined {
+    return getToolchainFromConfigurationParameter('toolchain');
+}
+
 function updateUserConfigurationParameter(updateParameter: (c: any) => void): void {
     let configuration = getUserConfiguration();
     if (!configuration) {