New "pause" button on debugger that sends SIGINT to remote process

Since fixing the restart button, the pause button is always enabled.
There doesn't seem to be a way to disable it, so let's make it do
something useful. For example, if a python program is run with
PYTHONINSPECT=1 environment variable, then the pause button
will interrupt the program an open a REPL for inspecting the current
program state.

Know bug: pause button does not work after restarting with the restart
button. This is caused by <microsoft/vscode#88784>.

Author: dlech

CHANGELOG.md

@@ -5,6 +5,7 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 
 ## Unreleased
 ### Added
+- New "pause" button on debugger that sends SIGINT to remote process
 - New "interactiveTerminal" debugger option to run remote programs in
   interactive terminal instead of output pane
 ### Fixed

src/debugServer.ts

@@ -1,4 +1,4 @@
-import { DebugSession, Event, TerminatedEvent } from 'vscode-debugadapter';
+import { DebugSession, Event, TerminatedEvent, Thread, ThreadEvent, StoppedEvent, ContinuedEvent } from 'vscode-debugadapter';
 import { DebugProtocol } from 'vscode-debugprotocol';
 
 /**
@@ -13,6 +13,8 @@ export interface LaunchRequestArguments extends DebugProtocol.LaunchRequestArgum
     interactiveTerminal: boolean;
 }
 
+const THREAD_ID = 0;
+
 export class Ev3devBrowserDebugSession extends DebugSession {
     protected initializeRequest(response: DebugProtocol.InitializeResponse,
         args: DebugProtocol.InitializeRequestArguments): void {
@@ -29,6 +31,10 @@ export class Ev3devBrowserDebugSession extends DebugSession {
 
     protected customRequest(command: string, response: DebugProtocol.Response, args: any): void {
         switch (command) {
+            case 'ev3devBrowser.debugger.thread':
+                this.sendEvent(new ThreadEvent(args, THREAD_ID));
+                this.sendResponse(response);
+                break;
             case 'ev3devBrowser.debugger.terminate':
                 this.sendEvent(new TerminatedEvent());
                 this.sendResponse(response);
@@ -41,6 +47,20 @@ export class Ev3devBrowserDebugSession extends DebugSession {
         this.sendEvent(new Event('ev3devBrowser.debugger.stop', args));
         this.sendResponse(response);
     }
+
+    protected threadsRequest(response: DebugProtocol.ThreadsResponse): void {
+        response.body = {
+            threads: [
+                new Thread(THREAD_ID, 'thread')
+            ]
+        };
+        this.sendResponse(response);
+    }
+
+    protected pauseRequest(response: DebugProtocol.PauseResponse, args: DebugProtocol.PauseArguments): void {
+        this.sendEvent(new Event('ev3devBrowser.debugger.interrupt', args));
+        this.sendResponse(response);
+    }
 }
 
 if (require.main === module) {

src/extension.ts

@@ -180,6 +180,7 @@ async function handleCustomDebugEvent(event: vscode.DebugSessionCustomEvent): Pr
                     ch.on('close', () => {
                         if (debugRestarting) {
                             activeDebugSessions.add(event.session.id);
+                            event.session.customRequest('ev3devBrowser.debugger.thread', 'started');
                         } else {
                             event.session.customRequest('ev3devBrowser.debugger.terminate');
                         }
@@ -204,6 +205,7 @@ async function handleCustomDebugEvent(event: vscode.DebugSessionCustomEvent): Pr
                         ch.destroy();
                     });
                     debugTerminal.show();
+                    event.session.customRequest('ev3devBrowser.debugger.thread', 'started');
                 }
                 else {
                     output.show(true);
@@ -216,6 +218,7 @@ async function handleCustomDebugEvent(event: vscode.DebugSessionCustomEvent): Pr
                             output.clear();
                             output.appendLine(`Restarting: ${command}`);
                             output.appendLine('----------');
+                            event.session.customRequest('ev3devBrowser.debugger.thread', 'started');
                         } else {
                             event.session.customRequest('ev3devBrowser.debugger.terminate');
                         }
@@ -242,6 +245,7 @@ async function handleCustomDebugEvent(event: vscode.DebugSessionCustomEvent): Pr
                         output.append(chunk.toString());
                     });
                     output.appendLine('----------');
+                    event.session.customRequest('ev3devBrowser.debugger.thread', 'started');
                 }
                 activeDebugSessions.add(event.session.id);
             }
@@ -257,6 +261,12 @@ async function handleCustomDebugEvent(event: vscode.DebugSessionCustomEvent): Pr
                 device.exec('conrun-kill --signal=SIGKILL');
             }
             break;
+        case 'ev3devBrowser.debugger.interrupt':
+            device = ev3devBrowserProvider.getDeviceSync();
+            if (activeDebugSessions.has(event.session.id) && device && device.isConnected) {
+                device.exec('conrun-kill --signal=SIGINT');
+            }
+            break;
     }
 }