I have very similar approach, but with generators + co library -
https://github.com/sidorares/repl-co
On Sunday, 2 February 2014 21:26:46 UTC+11, Harald Hanche-Olsen wrote:
>
> When experimenting in the node REPL, I often find myself running
> functions that report their result via a callback. When I do so, I get
> a REPL prompt immediately back, of course, and this messes up the
> output from the function I just called. So I decided I wanted a
> facility for making the REPL wait for the callback to be called before
> moving on. I came up with the following code:
>
> var geval=eval; // global eval ← javascript magick
> function Async (fn) {this.fn=fn;}
> global.async=function async (fn) {return new Async(fn);};
> function aeval(cmd,context,filename,callback) {
> var res;
> try {res=geval(cmd);}
> catch (e) {callback(e,null)};
> if (res instanceof Async) {
> res.fn(callback);
> } else {
> callback(null,res);
> }}
>
> require("repl")
> .start({prompt:"> ",useGlobal:true,eval:aeval})
> .on("exit",process.exit);
>
> Now if I stick this in a file "arepl.js" and run "node arepl.js", I
> get a REPL that behaves just like the usual one, unless I wrap a
> function in async:
>
> > async(function(cb){setTimeout(function(){cb(null,"hi!")},2000)})
> # two seconds pass with no output
> 'hi!'
> >
>
> My approach may be simple minded, but it satisfies my needs.
> If someone can suggest a better way, I'm all ears.
>
> Would it be an idea to add a similar mechanism to the standard REPL?
> I am sure I am not the only one who could use something like this.
>
> – Harald
>
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