debugger: add 'kill' command

lib/_debugger.js

@@ -278,7 +278,8 @@ Client.prototype.step = function(action, count, cb) {
 
 
 
-var helpMessage = "Commands: run, print, step, next, continue, scripts, backtrace, version, quit";
+var helpMessage = "Commands: run, kill, print, step, next, " +
+                  "continue, scripts, backtrace, version, quit";
 
 function SourceUnderline(sourceText, position) {
   if (!sourceText) return;
@@ -420,10 +421,15 @@ Interface.prototype.handleCommand = function(cmd) {
     if (self.child) {
       self.restartQuestion(function (yes) {
         if (!yes) {
+          self._lastCommand = null;
           term.prompt();
         } else {
           console.log("restarting...");
-          self.trySpawn();
+          self.killChild();
+          // XXX need to wait a little bit for the restart to work?
+          setTimeout(function () {
+            self.trySpawn();
+          }, 1000);
         }
       });
     } else {
@@ -488,9 +494,22 @@ Interface.prototype.handleCommand = function(cmd) {
       self.printNotConnected();
       return;
     }
-    client.reqContinue(function (res) {
-      // Wait for break point. (disable raw mode?)
-    });
+    client.reqContinue();
+
+  } else if (/^k(ill)?/.test(cmd)) {
+    // kill
+    if (self.child) {
+      self.killQuestion(function (yes) {
+        if (yes) {
+          self.killChild();
+        } else {
+          self._lastCommand = null;
+        }
+        self.term.prompt();
+      });
+    } else {
+      self.term.prompt();
+    }
 
   } else if (/^next/.test(cmd) || /^n/.test(cmd)) {
     if (!client) {
@@ -541,13 +560,10 @@ Interface.prototype.handleCommand = function(cmd) {
 };
 
 
-var restartQuestionPrompt = "The program being debugged has " +
-                            "been started already.\n" +
-                            "Start it from the beginning? (y or n): ";
 
-Interface.prototype.restartQuestion = function(cb) {
+Interface.prototype.yesNoQuestion = function(prompt, cb) {
   var self = this;
-  this.term.question(restartQuestionPrompt, function (answer) {
+  this.term.question(prompt, function (answer) {
     if (/^y(es)?$/i.test(answer)) {
       cb(true);
     } else if (/^n(o)?$/i.test(answer)) {
@@ -560,16 +576,27 @@ Interface.prototype.restartQuestion = function(cb) {
 };
 
 
-Interface.prototype.killChild = function() {
-  if (this.client) {
-    this.client.destroy();
-    this.client = null;
-  }
+Interface.prototype.restartQuestion = function(cb) {
+  this.yesNoQuestion("The program being debugged has been started already.\n" +
+                     "Start it from the beginning? (y or n) ", cb);
+};
+
+
+Interface.prototype.killQuestion = function(cb) {
+  this.yesNoQuestion("Kill the program being debugged? (y or n) ", cb);
+};
+
 
+Interface.prototype.killChild = function() {
   if (this.child) {
     this.child.kill();
     this.child = null;
   }
+
+  if (this.client) {
+    this.client.destroy();
+    this.client = null;
+  }
 };
 
 
@@ -598,7 +625,6 @@ Interface.prototype.trySpawn = function(cb) {
       console.log("\nprogram terminated");
       self.client = null;
       self.killChild();
-      self.term.prompt();
     });
 
     client.on('unhandledResponse', function (res) {