Code improvements.

extension/src/debugger/VsCodeDebuggerView.ts

@@ -0,0 +1,48 @@
+import { Disposable } from "@hediet/std/disposable";
+import { debug, DebugSession } from "vscode";
+import { observable, action } from "mobx";
+import { VsCodeDebugger } from "./VsCodeDebugger";
+import { EnhancedDebugSession } from "./EnhancedDebugSession";
+
+/**
+ * Tracks the currently active debug session and its currently active stack frame.
+ * This is currently all faked. A proper API would be nice.
+ */
+export class VsCodeDebuggerView {
+	public readonly dispose = Disposable.fn();
+
+	@observable private _activeDebugSession: EnhancedDebugSession | undefined;
+
+	public get activeDebugSession(): EnhancedDebugSession | undefined {
+		return this._activeDebugSession;
+	}
+
+	public get activeFrameId(): number | undefined {
+		if (!this._activeDebugSession) {
+			return undefined;
+		} else {
+			return this._activeDebugSession["activeStackFrame"];
+		}
+	}
+
+	constructor(private vsCodeDebugger: VsCodeDebugger) {
+		this.dispose.track(
+			debug.onDidChangeActiveDebugSession(activeSession => {
+				this.updateActiveDebugSession(activeSession);
+			})
+		);
+		this.updateActiveDebugSession(debug.activeDebugSession);
+	}
+
+	@action
+	private updateActiveDebugSession(activeSession: DebugSession | undefined) {
+		if (!activeSession) {
+			this._activeDebugSession = undefined;
+		} else {
+			const s = this.vsCodeDebugger.getEnhancedDebugSession(
+				activeSession
+			);
+			this._activeDebugSession = s;
+		}
+	}
+}