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Re: [Chicken-users] xc: chicken-based “bc” replacement

From: Mario Domenech Goulart
Subject: Re: [Chicken-users] xc: chicken-based “bc” replacement
Date: Tue, 25 Nov 2008 09:07:03 -0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (gnu/linux)

Hi Alejo.

On Fri, 21 Nov 2008 18:12:26 +0100 Alejandro Forero Cuervo <address@hidden> 

> I decided to write a simple bc replacement using Chicken.  I had the
> following goals:
> 1. Have a syntax for expressions that requires very little typing.  In
> other words, make it fast to evaluate a lot of expressions.
> 1.1. Allow me to type inputs in multiple formats.  For instance,
> understand “5d3h20s” or “23:12:03” (time) and convert that to 442820.
> Similarly for things like “3Gi” (3*2^50) or “3G” (3*10^9).
> 2. Have a syntax for expressions that most people would understand.
> For example, I use infix binary operators and express procedure
> application as “proc(arg0, ..., argn)”.  This will allow me to show
> the expressions I use to evaluate certain things to people that I work
> with.  Basically, have a syntax as “universal” as possible.
> 3. Allow me to specify the format in which I want the output.
> 4. Allow me to call functions defined in Scheme.  Also allow me to
> set variables and reuse their values.

Pretty cool.  Another usage alternative I've thought would be plugging
xc.scm in csi and defining a csi toplevel command[1] (e.g., ,xc ).

So you could use csi like you usually do and you'd have a ,xc command
that passes expressions to xc.  Something like:

csi> ,xc 1+1

Just a random thought.


Best wishes.

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