Add custom cargo runners

editors/code/src/tasks.ts

@@ -1,11 +1,14 @@
 import * as vscode from 'vscode';
 import * as toolchain from "./toolchain";
+import { Config } from './config';
+import { log } from './util';
 
 // This ends up as the `type` key in tasks.json. RLS also uses `cargo` and
 // our configuration should be compatible with it so use the same key.
-const TASK_TYPE = 'cargo';
+export const TASK_TYPE = 'cargo';
+export const TASK_SOURCE = 'rust';
 
-interface CargoTaskDefinition extends vscode.TaskDefinition {
+export interface CargoTaskDefinition extends vscode.TaskDefinition {
     command?: string;
     args?: string[];
     cwd?: string;
@@ -14,9 +17,11 @@ interface CargoTaskDefinition extends vscode.TaskDefinition {
 
 class CargoTaskProvider implements vscode.TaskProvider {
     private readonly target: vscode.WorkspaceFolder;
+    private readonly config: Config;
 
-    constructor(target: vscode.WorkspaceFolder) {
+    constructor(target: vscode.WorkspaceFolder, config: Config) {
         this.target = target;
+        this.config = config;
     }
 
     provideTasks(): vscode.Task[] {
@@ -58,29 +63,52 @@ class CargoTaskProvider implements vscode.TaskProvider {
             });
     }
 
-    resolveTask(task: vscode.Task): vscode.Task | undefined {
+    async resolveTask(task: vscode.Task): Promise<vscode.Task | undefined> {
         // VSCode calls this for every cargo task in the user's tasks.json,
         // we need to inform VSCode how to execute that command by creating
         // a ShellExecution for it.
 
         const definition = task.definition as CargoTaskDefinition;
 
-        if (definition.type === 'cargo' && definition.command) {
+        if (definition.type === TASK_TYPE && definition.command) {
             const args = [definition.command].concat(definition.args ?? []);
 
-            return new vscode.Task(
-                definition,
-                task.name,
-                'rust',
-                new vscode.ShellExecution('cargo', args, definition),
-            );
+            return await buildCargoTask(definition, task.name, args, this.config.cargoRunner);
         }
 
         return undefined;
     }
 }
 
-export function activateTaskProvider(target: vscode.WorkspaceFolder): vscode.Disposable {
-    const provider = new CargoTaskProvider(target);
+export async function buildCargoTask(definition: CargoTaskDefinition, name: string, args: string[], customRunner?: string): Promise<vscode.Task> {
+    if (customRunner) {
+        const runnerCommand = `${customRunner}.createCargoTask`;
+        try {
+            const runnerArgs = { name, args, cwd: definition.cwd, env: definition.env, source: TASK_SOURCE };
+            const task = await vscode.commands.executeCommand(runnerCommand, runnerArgs);
+
+            if (task instanceof vscode.Task) {
+                return task;
+            } else if (task) {
+                log.debug("Invalid cargo task", task);
+                throw `Invalid task!`;
+            }
+            // fallback to default processing
+
+        } catch (e) {
+            throw `Cargo runner '${customRunner}' failed! ${e}`;
+        }
+    }
+
+    return new vscode.Task(
+        definition,
+        name,
+        TASK_SOURCE,
+        new vscode.ShellExecution(toolchain.cargoPath(), args, definition),
+    );
+}
+
+export function activateTaskProvider(target: vscode.WorkspaceFolder, config: Config): vscode.Disposable {
+    const provider = new CargoTaskProvider(target, config);
     return vscode.tasks.registerTaskProvider(TASK_TYPE, provider);
 }