-*- outline -*-

* There Be Dragons Here

This is a very incomplete port of some scsh functionality for Guile
1.9.x/2.0. I have intentionally not maintained full scsh
compatibility--it may, however, be a future goal.

* Implementation Goals

** scsh functionality

*** Process Notation

Reimplemented from scratch in syntax-case. This should work as per the
scsh documentation. The code required to support it has been/will be
ported.

*** Syscalls

 - `with-errno-handler' is provided, but the `data' element of the
   exception packet is always #f
 - errno/ERROR are not provided (for now). Guile provides all errno
   values as variables with the C name (ugly, but it works)

*** Process Object / Execution Interface

This has a few differences from scsh. Notably:

 - environments are represented as ("VAR=VALUE" ...) instead of ((VAR
   . VALUE) ...) as per Guile's `environ' function
 - `exec-path-list' is an SRFI-39 parameter
 - `pid->proc' is intentionally not implemented
 - `with-autoreaping' is not supported

*** SRE

irregex-guile.scm (instructions within)

Patch sent to irregex <http://synthcode.com/scheme/irregex/> author to
define a guile module.

*** scsh awk loop

This will be difficult to do well. A naive rewrite based on the docs
using syntax-case will probably be best initially. The awk
implementation in scsh does a number of hairy optimizations and is
written in an explicit-renaming macro system and so any conversion
will require quite a bit of effort.

*** tty/pty interface

This has slightly more features that the Guile tty/pty interfaces
AFAICT (I've only looked at the docs so far). Will need to be a fresh
implementation (no sense in porting the scheme48/scsh C interfaces)
and probably belongs in Guile itself.