Reuse the terminal instance that has already been created.

Author: Anglebase

src/extension.ts

@@ -5,6 +5,7 @@ import ZigDiagnosticsProvider from "./zigDiagnosticsProvider";
 import ZigMainCodeLensProvider from "./zigMainCodeLens";
 import ZigTestRunnerProvider from "./zigTestRunnerProvider";
 import { registerDocumentFormatting } from "./zigFormat";
+import { registerTerminalStateManagement } from "./terminalState";
 import { setupZig } from "./zigSetup";
 
 export async function activate(context: vscode.ExtensionContext) {
@@ -17,6 +18,7 @@ export async function activate(context: vscode.ExtensionContext) {
         const testRunner = new ZigTestRunnerProvider();
         testRunner.activate(context.subscriptions);
 
+        registerTerminalStateManagement();
         ZigMainCodeLensProvider.registerCommands(context);
         context.subscriptions.push(
             vscode.languages.registerCodeLensProvider(

src/terminalState.ts

@@ -0,0 +1,26 @@
+/**
+ * A status monitor for a VSCode terminal.
+ */
+
+import vscode from "vscode";
+
+const terminalsState = new Map<vscode.Terminal, boolean>();
+
+export function getTerminalState(terminal: vscode.Terminal): boolean | undefined {
+    return terminalsState.get(terminal);
+}
+
+export function registerTerminalStateManagement(): void {
+    vscode.window.onDidOpenTerminal((terminal) => {
+        terminalsState.set(terminal, false);
+    });
+    vscode.window.onDidStartTerminalShellExecution((event) => {
+        terminalsState.set(event.terminal, true);
+    });
+    vscode.window.onDidEndTerminalShellExecution((event) => {
+        terminalsState.set(event.terminal, false);
+    });
+    vscode.window.onDidCloseTerminal((terminal) => {
+        terminalsState.delete(terminal);
+    });
+}

src/zigMainCodeLens.ts

@@ -6,6 +6,7 @@ import path from "path";
 import util from "util";
 
 import { getWorkspaceFolder, isWorkspaceFile } from "./zigUtil";
+import { getTerminalState } from "./terminalState";
 import { zigProvider } from "./zigSetup";
 
 const execFile = util.promisify(childProcess.execFile);
@@ -43,7 +44,9 @@ function zigRun() {
     const zigPath = zigProvider.getZigPath();
     if (!zigPath) return;
     const filePath = vscode.window.activeTextEditor.document.uri.fsPath;
-    const terminal = vscode.window.createTerminal("Run Zig Program");
+    const terminalName = "Run Zig Program";
+    const terminals = vscode.window.terminals.filter((t) => t.name === terminalName && getTerminalState(t) === false);
+    const terminal = terminals.length > 0 ? terminals[0] : vscode.window.createTerminal(terminalName);
     const callOperator = /(powershell.exe$|powershell$|pwsh.exe$|pwsh$)/.test(vscode.env.shell) ? "& " : "";
     terminal.show();
     const wsFolder = getWorkspaceFolder(filePath);