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Re: [GSoC] Bourne-shell compiler front-end for Guile
From: |
Efraim Flashner |
Subject: |
Re: [GSoC] Bourne-shell compiler front-end for Guile |
Date: |
Tue, 22 Mar 2016 21:18:01 +0200 |
On Mon, 21 Mar 2016 23:27:25 +0100
address@hidden (Ludovic Courtès) wrote:
> Hi Efraim,
>
> Thanks for your proposal!
>
> This project can be pretty fun, I think, and quite rewarding if it
> indeed allows us to get rid of a bunch of bootstrap binaries.
>
> As I see it, the project covers mostly two areas:
>
> 1. Lexing & parsing. This compiler front-end will need a real parser
> for the Bourne shell syntax, notably semicolon-separated command
> sequences, pipes, brace-delimited blocks, functions, variables, and
> ‘test’ and ‘[’.
>
> The available tools could be SILex + (system base lalr) (the latter
> is part of Guile, the former is maintained separately; a copy can
> be found in Guile-RPC for instance.)
>
> 2. Run-time support: redirections, pipes, background execution, C-c
> (SIGINT) and C-z (SIGTSTP), globbing, and so on.
>
> Guile provides just the basic here, and a little more with (ice-9
> popen). Scsh and its Guile port(s) provide a lot of that, so it
> might be a good idea to see what can be stolen from these.
>
> It may be that some of your CS classes cover some of this ground (a
> fairly common programming project here at university is to implement a
> small shell precisely because it covers several areas.)
>
> How does that sound?
>
> Perhaps one way to get started would be by looking at the available
> tools for #1, and experimenting with hacks for #2, possibly borrowing
> code from Scsh.
>
> Thoughts?
Sounds like lots of fun, I'm really looking forward to it. And it sounds like
I'll need to dive deeper into bash to see what I get to implement
>
> Thanks,
> Ludo’.
>
> PS: Would be nice to have a second mentor on this, either officially or
> unofficially (if you don’t want to have a to be known to Google…).
> Any takers? :-)
--
Efraim Flashner <address@hidden> אפרים פלשנר
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