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Racket Scheme

These days I write more and more code in scheme. Guix support for Racket scheme and Guile scheme is rather good (unsurprisingly perhaps).

Installation

For Racket simply do

guix package -i racket

I usually create a special profile with

guix package -i racket -p ~/opt/racket

and load the environment with

source ~/opt/racket/profile

Works a treat. All tools should work.

To get the emacs working environment

guix package -i emacs emacs-magit emacs-rainbow-mode \
    emacs-racket-mode emacs-geiser \
    emacs-json-mode emacs-markdown-mode emacs-org \
    emacs-paredit racket -p ~/opt/racket

Link against (C) libraries

One thing that requires an extra step is compilation of external C libs. An example could read

#include "escheme.h"

Scheme_Object *scheme_initialize(Scheme_Env *env) {
  Scheme_Env *mod_env;
  mod_env = scheme_primitive_module(scheme_intern_symbol("hi"),
                                    env);
  scheme_add_global("greeting",
                    scheme_make_utf8_string("hello"),
                    mod_env);
  scheme_finish_primitive_module(mod_env);
  return scheme_void;
}

Scheme_Object *scheme_reload(Scheme_Env *env) {
  return scheme_initialize(env); /* Nothing special for reload */
}

Scheme_Object *scheme_module_name() {
  return scheme_intern_symbol("hi");
}

This is because crti.o is missing, e.g. following the docs on 3m extensions brings up the error

raco ctool --3m --ld hw.so hw_3m.o
  ld: cannot find crti.o: No such file or directory

crti.o is part of the glibc package which needs to be added to the profile (see also R.org). One quick hack is to find the glibc in racket and add that to the path

ldd ~/opt/racket/bin/racket
        /gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib/ld-linux-x86-64.so.2
export LIBRARY_PATH=/gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib
raco ctool --xform hw.c
raco ctool --3m --cc hw.3m.c
raco ctool --3m --ld hw.so hw_3m.o

now builds. The module can be loaded with

> (load-extension "hw.so")
"hi"

Note you may have to update the module search path first btw with something like

(current-directory (build-path "/home/user/racket"))

note that DrRacket (for some reason) may start in $HOME. To check print the path with

(current-directory)

To create a proper module read the docs. You can also use the FFI which allows you to bind C functions natively without much work.