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	Sun, 26 Jul 2015 05:28:16 -0700 (PDT)
Date:	Sun, 26 Jul 2015 15:28:14 +0300
From:	"Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] The new to do
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On Sat, Jul 25, 2015 at 09:06:56PM +0200, Kai-Martin Knaak wrote:
...
> > Anyway, the script for gschem is attached.
> 
> Unfortunately, it is all greek, err, guile to me. But good to see that 
> this kind of tasks can be tackled in current gschem.

The guile syntax is simple enough, any function has the following form
  (function-name arg1 arg2 ...)

So you have just to find functions you need and get used to them.
Some special forms exists, though, such as 'define', 'lambda' and 'let/let*'.

'lambda' is like a function without name. 'define' assigns name with it.
Semicolons introduce comments.
Say, you can write:

(define add-two
  (lambda (x) (+ x 2))
  ) ; comment here

x here is an argument of the function. (+ x 2) is the body.
As you can see, the calculated value of the last expression is always
the returned value of any expression.

If your text editor is advanced enough, it will show you where the
function starts (its opening left parenthesis) and ends (the closing
right one).

You can abbreviate the above example as follows:
(define (add-two x)
  (+ x 2))

I think the differences are obvious.

The let/let* forms are just syntactic sugar for lambda. You can even
make up your own forms.

The simple 'let' is used as follows:
  (let ( (arg1 value1)
         (arg2 value2)
         ...
       )
       body
   )

let* is the same, but any args can use previous ones to calculate their
values.

So you can write:
  
  (let ( (a 1)
         (b 2)
        )
        (+ a b))

and this expression returns 3. '+' is also a function (procedure).

Or you can write
  (let (
        (a 1)
        (b (* a 2))
       )
     (+ a b))

This returns the same value, but b is the product of a and two.

There are also various possibilities that make guile attractive, such
as, e.g.,  tail calls, continuations, closures, which can be learned if
the user will write programs scripts in guile.

Cheers,
  Vladimir

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