this if-let-all do not support destructure, I writed a improved

https://gist.github.com/gfZeng/8e8e18f148d5742b064c

On Tuesday, June 9, 2015 at 8:00:53 PM UTC+8, crocket wrote:
>
> It evaluates true-case only if every local binding evaluates to true values. 
> false-case has no access to local bindings.
>
> (defmacro if-let-all
>   "if-let-all evaluates every local binding sequentially and evaluates 
> true-case only if every local binding is a truthy value.
> true-case has access to all local bindings, but false-case doesn't have 
> access to local bindings."
>   [bindings true-case false-case]
>   (let [pairs (partition 2 bindings)
>         names (mapv first pairs)
>         exprs (map second pairs)
>         exprs-in-if-let (fn self [[name1 & more-names] [expr1 & more-exprs]]
>                          `(if-let [~name1 ~expr1]
>                             ~(if more-names
>                                (self more-names more-exprs)
>                                names)))
>         things (exprs-in-if-let names exprs)]
>     `(if-let [~names ~things]
>        ~true-case
>        ~false-case)))
>
> I think this macro could benefit people if I found the right project where it 
> should reside.
> Can anyone help me find the right project for if-let-all?
>
>

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