Playing arround with mixin - alias?

[Martin Tschierschke via Digitalmars-d-learn]

On Friday, 21 April 2017 at 10:31:46 UTC, ketmar wrote:
> biozic wrote:
>
>> On Friday, 21 April 2017 at 09:42:33 UTC, ketmar wrote:
>>> Martin Tschierschke wrote:
>>>
>>>> Is it possible to define an alias for something like
>>>>
>>>> mixin(import("local_function_file.d"));
>>>>
>>>> to write only
>>>>
>>>>     use_local_function;
>>>>
>>>> which will be translated to: 
>>>> mixin(import("local_function_file.d"));
>>>>
>>>> (this additionally needs the file local_function_file.d in 
>>>> source/ +
>>>> -J./source as parameter for dmd aka.  dflags "-J./source" in 
>>>> dub.sdl)
>>>>
>>>> Regards mt.
>>>
>>> nope. the best you can get is `mixin use_local_function;`.
>>
>> Would there be an advantage compared to a simple `import 
>> local_function_file;`?
>
> i doubt so.
So my "solution" on how to get a short cut for using:

writeln(mixin(interp!"${name} you are app. ${age*365} days old"));


// first place in source/exho.d the following code:

auto mixinter(string x)(){return mixin(interp!x);}
auto exho(string x)(){return mixin("writeln("~interp!x~")");}

later compile this with -J./source

source/app.d:

import scriptlike;

auto insert(string name)(){return import(name);}
alias insert!"exho.d" use_exho;



void main()
{
   auto name = userInput!string("Please enter your name");
   auto age = userInput!int("And your age");

//Now you can write in  every scope you need it:
   mixin(use_exho);
   exho!"${name} you are app. ${age*365} days old";

// Which looks little nicer than:
// writeln(mixin(interp!"${name} you are app. ${age*365} days 
old"));

// or if you need the result in a var:

   mixin(use_exho);
   auto var = mixinter!"${name} you are app. ${age*365} days old";

   writeln(var);
}

you may even name the alias just exho and write:

  alias insert!"exho.d" exho;

  mixin(exho);
  exho!"${name} you are app. ${age*365} days old";

(exho was derived from shell echo with mi_x_in)