Efraim Flashner <efr...@flashner.co.il> skribis: > On Mon, 21 Mar 2016 23:27:25 +0100 > l...@gnu.org (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
I guess a related question is how confident/familiar you feel with the two areas above. The agenda could be adjusted as a function of that. Thanks, Ludo’.
