Make it possible to define JS functions as Tcl procs

[uatuko]

This was asked in issue 1 and would be a handy thing to have.

e.g

// javascript function reference
var multiply = function ( x, y ) {
    return (x * y);
};

// define a Tcl proc 
tcl.proc( 'multiply', multiply );

// usage
tcl.$.set( 'x', '[multiply 10 20]' );

Discussion points

• How would this look like for the asynchronous interfaces (eval() and queue())?

[ekarak]

should also target anonymous functions, such as:

tcl.proc('multiply', function(x,y) {
    return (x*y);
});

[ekarak]

One advanced concept I'd find interesting would be to couple Tcl's event loop with ES6 promises.
Thus, heavy/time consuming/external system JS calls functions returning Promises would yield control immediately back to Tcl's interpreter and maybe fire vwait's on the Promise result

[ekarak]

OK, starting work on this beast of a feature. I find this idiom a bit redundant though:
tcl.proc('multiply', multiply)
How bout
tcl.expose(multiply)
or
tcl.expose(multiply).as('multiply')

[uatuko]

I wouldn't mind tcl.expose(multiply).as('multiply') and agree it looks nicer 😄 (not sure how tcl.expose(multiply) would work though).

[uatuko]

@ekarak, if you are going to work on this please assign it to yourself.

[ekarak]

I can't :) need permissions probably.
I've forked and I'm working on my own repo anyway.

[uatuko]

Sorted...

[uatuko]

@ekarak, are you still working on this?

[uatuko]

Implemented in #15