Re: grep and sed in guile

[Stefan Israelsson Tampe <stefan.itampe@gmail.com>]

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Nice!

Also scsh for guile can be used to get grep and sed functionality. The
interesting thing is to try to
design sed/grep like functionality that knows about scheme or C or whatever
format in some clever way.
Usually sad and grep is good enough, but it is an interesting task never
the less. My plan for know is to be able
to stream scheme source file and be able to sed them with an interface that
is close to syntax-parse. That would be
really cool.

Cheers


On Tue, Aug 27, 2013 at 3:27 PM, Ludovic Courtès <ludo@gnu.org> wrote:

> > 3) (sed m expr)
> >
> > This will print out on std output all lines not matched by m, if m is
> > matched then that expr will make sure to print the correct way
> >
> > An example matcher is
> >   m := (s-tr a b)
> >
> > which will replace a by b
>
> FWIW Guix has a sed-like macro, called ‘substitute*’ [0].  Example:
>
>   (substitute* "my-file.txt"
>     (("^(.*) world$" _ first-word)
>      (string-append "Hello (was: " first-word ") world\n")))
>
> Ludo’.
>
> [0]
> http://git.savannah.gnu.org/cgit/guix.git/tree/guix/build/utils.scm#n387
>
>
>

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