feat: repl command

Author: Jan Krems

lib/node-inspect.js

@@ -476,8 +476,8 @@ function createCommandContext(inspector) {
 
   const scripts = {};
   const watchedExpressions = [];
-
   const knownBreakpoints = [];
+  const history = { debug: [], control: [] };
 
   const writer = createRemoteAwareWriter(true);
   const formatValue = value => writer(value);
@@ -530,6 +530,21 @@ function createCommandContext(inspector) {
     }
   }
 
+  // Exit debug repl
+  function exitRepl() {
+    // Restore eval
+    repl.eval = (code, ctx, file, cb) =>
+      inspector.controlEval(code, ctx, file, cb);
+
+    // Swap history
+    history.debug = repl.rli.history;
+    repl.rli.history = history.control;
+
+    repl.context = inspector.context;
+    repl.rli.setPrompt('debug> ');
+    repl.displayPrompt();
+  }
+
   const ctx = {
     get help() {
       const commands = [
@@ -582,6 +597,49 @@ function createCommandContext(inspector) {
           .then(convertResultToRemoteObject);
     },
 
+    get repl() {
+      // if (!this.requireConnection()) return;
+      print('Press Ctrl + C to leave debug repl');
+
+      // Don't display any default messages
+      const listeners = repl.rli.listeners('SIGINT').slice(0);
+      repl.rli.removeAllListeners('SIGINT');
+
+      function exitDebugRepl() {
+        // Restore all listeners
+        process.nextTick(() => {
+          listeners.forEach((listener) => {
+            repl.rli.on('SIGINT', listener);
+          });
+        });
+
+        // Exit debug repl
+        exitRepl();
+
+        repl.rli.removeListener('SIGINT', exitDebugRepl);
+        repl.removeListener('exit', exitDebugRepl);
+      }
+
+      // Exit debug repl on SIGINT
+      repl.rli.on('SIGINT', exitDebugRepl);
+
+      // Exit debug repl on repl exit
+      repl.on('exit', exitDebugRepl);
+
+      // Set new
+      repl.eval = (code, evalCtx, file, cb) => {
+        toCallback(ctx.debugEval(code), cb);
+      };
+      repl.context = {};
+
+      // Swap history
+      history.control = repl.rli.history;
+      repl.rli.history = history.debug;
+
+      repl.rli.setPrompt('> ');
+      repl.displayPrompt();
+    },
+
     exec(code) {
       return ctx.debugEval(code);
     },
@@ -926,7 +984,6 @@ class Inspector {
     this.waiting = null;
     this.paused = 0;
     this.context = this.repl.context;
-    this.history = { debug: [], control: [] };
     this.breakpoints = [];
     this._watchers = [];