Hello people! :)

Lately I've been working a bit on julia packages support in guix.

The good news first: I've been able to install dozen of them, including
those depending on binaryprovider with simple workarounds.
1. By writing manually the deps.jl file (the one that saves the path of
dynamic libraries in a julia const)
2. By "manually" writing required Package.toml files for old packages that
are not using it yet (else julia cannot find them)
3. By adding a simple startup.jl script, inspired by what emacs does. This
is simplified so I'm not sure it works for every corner case.
#+begin_src julia
let paths = [expanduser("~/.guix-profile"), "/run/current-system/profile"]
    ("GUIX_ENVIRONMENT" in keys(ENV)) && push!(paths,
ENV["GUIX_ENVIRONMENT"])
    empty!(LOAD_PATH)
    push!.(Ref(LOAD_PATH), joinpath.(paths, "share/julia/packages/"))
    push!(LOAD_PATH, "@stdlib")
    push!.(Ref(DEPOT_PATH), joinpath.(paths, "share/julia/"))
    nothing
end
#+end_src

With those, I've been able to install the following (with their
dependencies):
- Plots.jl (GR.jl backend)
- HTTP.jl
- Gtk.jl
- Gumbo.jl/Cascadia.jl
- FileIO.jl
- CSVFiles.jl ;; TODO: Fix warnings
- JSON.jl
- JSON2.jl
- MsgPack.jl
- DataFrames.jl
- Query.jl
- SQLite.jl
- Interact.jl

There is a phase called 'precompile' even if I could not get julia actually
use the precompiled packages. This is similar to what emacs does (.el ->
.elc). Even if currently this cache is not used, is useful to have this
phase to verify that package import works.

Now the bad news: this patch is really big (mostly because I wanted to be
sure that in principle installing every package is possible. Before
splitting the second patch into multiple small ones, I wanted to be sure
that what I'm doing is somewhat correct.

Also, even if I was able to install those by using a separate folder (with
guix environment -L .), I'm getting this error now, and I don't know what
is causing it (since I'm not touching those files):

#+begin_example
   626:19  2 (_ #<directory (gnu packages gnuzilla) 805fd20>)
   293:34  1 (_ #(#(#(#(#(#(#(#(#(#(#(#(#<directory (gnu packages gnuzilla)
805fd20> "60.8.0") "60") "8") "0") "60.8.0esr") #<origin "
https://ftp.mozilla.org/pub/firefox/releas?>) #) #) #) #) #) #))
    159:9  0 (_ #(#(#(#(#(#(#(#(#(#(#(#(#<directory (gnu packages gnuzilla)
805fd20> "60.8.0") "60") "8") "0") "60.8.0esr") #<origin "
https://ftp.mozilla.org/pub/firefox/releas?>) #) #) #) #) #) #))

ice-9/eval.scm:159:9: Throw to key `srfi-34' with args `(#<condition
&message [message: "icecat-makeicecat.patch: patch not found"] 8eeae0>)'.
#+end_example

I hope somebody is willed to help getting this in a good state :)
Thanks, Nicolò!