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Newsgroups: comp.lang.ada
Subject: Re: Ada.Command_Line and wildcards
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From: Markus E Leypold
 <development-2006-8ecbb5cc8aREMOVETHIS@ANDTHATm-e-leypold.de>
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Date: Mon, 12 Mar 2007 16:17:17 +0100
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Jacob Sparre Andersen <sparre@nbi.dk> writes:

> Markus E Leypold wrote:
>
>> A running Ocaml toplevel requires only slightly more meory than bash
>> and it is faster and needs to fork less external tools.
>
> In my view, the whole idea with a shell is that it is used to launch
> (fork) external tools, so I am not convinced that it is a real
> benefit.

Yes + no. The shell is an environment where "procedures" are
implemented by providing external tools / binaries and composing them
via pipe. This was the best way to handle things on s PDP/11 with
really tight memory constraints. These days it's perhaps better to
"internalize" many of the standard functions. My suggestion is, that a
"tool" actually corresponds to a function (stdin -> stdout :-) and
piping is actually function composition. Of course external tools are
a separate case now, but that can be handled by introducing a wrapper:

  do-something | run "foo" ["arg1";"arg2"] | do-something-with-output 

Running multiple external process connected by pipelines becomes less
important now and will be a seperate case.

Regards -- Markus