node debug does not repeat last command when hitting enter at prompt

[lrowe]

When stepping through code with a command line debugger, it's really helpful to repeat the last command by hitting enter.

Steps to reproduce:

$ node debug script.js 
< Debugger listening on port 5858
connecting to 127.0.0.1:5858 ... ok
break in script.js:1
> 1 var a = 1;
  2 var b = 2;
  3 console.log(a);
debug> next
break in script.js:2
  1 var a = 1;
> 2 var b = 2;
  3 console.log(a);
  4 console.log(b);
debug> 
debug> 

The _debugger module seems to implement this in commandEval:

// Used for debugger's commands evaluation and execution
Interface.prototype.controlEval = function(code, context, filename, callback) {
  try {
    // Repeat last command if empty line are going to be evaluated
    if (this.repl.rli.history && this.repl.rli.history.length > 0) {
      if (code === '\n') {
        code = this.repl.rli.history[0] + '\n';
      }
    }

https://github.com/nodejs/node/blob/v5.9.1/lib/_debugger.js#L943-L951

Unfortunately it seems that the repl's self.eval is no longer called for empty commands:

    if (!skipCatchall && (cmd || (!cmd && self.bufferedCommand))) {
      var evalCmd = self.bufferedCommand + cmd;
      if (/^\s*\{/.test(evalCmd) && /\}\s*$/.test(evalCmd)) {
        // It's confusing for `{ a : 1 }` to be interpreted as a block
        // statement rather than an object literal.  So, we first try
        // to wrap it in parentheses, so that it will be interpreted as
        // an expression.
        evalCmd = '(' + evalCmd + ')\n';
      } else {
        // otherwise we just append a \n so that it will be either
        // terminated, or continued onto the next expression if it's an
        // unexpected end of input.
        evalCmd = evalCmd + '\n';
      }

      debug('eval %j', evalCmd);
      self.eval(evalCmd, self.context, 'repl', finish);
    } else {
      finish(null);
    }

https://github.com/nodejs/node/blob/v5.9.1/lib/repl.js#L413-L432

• Version: 5.9.1
• Platform: Darwin MachineName.local 15.4.0 Darwin Kernel Version 15.4.0: Fri Feb 26 22:08:05 PST 2016; root:xnu-3248.40.184~3/RELEASE_X86_64 x86_64
• Subsystem: _debugger

[Trott]

I believe this was fixed in 1df84f4. It seems to be working in Node.js 6.2.0. Closing. Please re-open if I'm mistaken.