"Ludovic Court=C3= =A8s" <ludo@gnu=2Eorg> skrev: (5 januari 2019 18:37:10 CET)
Hello swedebugia,

Sorry for the late reply!
swedebugia <swedebugia@riseup=2Enet> skribis:

 Today I wrote this draft blog post =
while playing around:

 Playing with Guix REPL from scratch

That sounds like a great topic for a blog post!

I would s=
uggest adding a bit of context: what does =E2=80=9CREPL=E2=80=9D mean? what=
 are
the possible use cases? how does it differ from what other package<=
br>managers provide? etc=2E

 This is a small example of how to quickly get an environment to =
play
 with Guix in guile=2E

 First setup your environment=2E
<=
br> I choose a x86_64 PC and booted up the installer from an usb stick=2E

That=E2=80=99s an option, but you could mention that one=
 can install Guix or
GuixSD and run =E2=80=98guix repl=E2=80=99 from the=
re=2E

 This is a ni=
ce environment because it already is running GuixSD in a
 console and yo=
u have are in Guix land with 8500 packages at your
 fingertips=2E
 I started by installing a sensible array of packages:

  $ guix pac=
kage -i emacs-no-x lynx git-minimal guile-readline
 guile-colorized emac=
s-paredit nss-certs

 To set this up as intended then run:

  $=
 export
 GUILE_LOAD_PATH=3D$HOME/=2Eguix-profile/share/guile/site/2=2E2:=
/run/current-system/profile/share/guile/site/2=2E2
  $ export SSL_CERT_D=
IR=3D/root/=2Eguix-profile/etc/ssl/certs

I don=E2=80=99=
t think GUILE_LOAD_PATH is needed if you use =E2=80=98guix repl=E2=80=99=2E=


 Now fire up the g=
uix repl with

  $guix repl

 Load e=2Eg=2E this to start hacki=
ng on package records:

 (use-modules
 	(guix packages)
 	(guix=
 import utils)
 	(gnu)
 	(gnu packages sync))

I=
=E2=80=99d suggest (guix) instead of (guix packages)=2E

 Now you can start hacking on all pack=
ages in sync=2Escm using Scheme
 procedures from (gnu packages) (see the=
 source of this module for
 details or guess and press tab)

 E=2E=
g=2E (package<TAB><TAB> shows this list of nice procedures avai=
liable:
 package
 package->cross-derivation

[=
=2E=2E=2E]

 What ca=
n we do with this you might ask?

You could show ,descri=
be and ,apropos at the REPL:

--8<---------------cut here---------=
------start------------->8---
scheme@(guix-user)> ,describe packag=
e-derivation
Return the <derivation> object of PACKAGE for SYSTEM=
=2E
scheme@(guix-user)> ,a origin
(guix packages): origin-patch-gu=
ile
(guix packages): origin-method
(guix packages): origin-patch-inpu=
ts
(guix packages): origin-patch-flags
(guix packages): origin-patche=
s
(guix packages): origin->derivation     #<procedure origin->d=
erivation (origin #:optional system)>
(guix packages): origin-snippet=

(guix packages): origin-modules
(guix packages): origin-actual-file-=
name        #<procedure origin-actual-file-name (origin)>
(guix pa=
ckages): origin
(guix packages): origin-uri
(guix packages): origin?<=
br>(guix packages): origin-file-name
(guix packages): origin-sha256
-=
-8<---------------cut here---------------end--------------->8---
<=
br>Though for some reason ,a doesn=E2=80=99t seem to work if you only use (=
guix),
hmm=E2=80=A6

 scheme@(guile-user)> (define snakes
                        (fol=
d-packages
                             (lambda (package lst)
       =
                        	(if (string-prefix? "python"
                  =
                     (package-name package))
 				       (cons (origin-u=
rl package) lst)
 			     lst))
 			'()))

=E2=80=
=98origin-url=E2=80=99 does not exist=2E  :-)  Make sure all the examples w=
ork so
that users are not disappointed=2E  It may be worth explaining ho=
w
=E2=80=98fold-packages=E2=80=99 works as it may be the first encounter=
 of =E2=80=98fold=E2=80=99 for
someone not familiar with functional prog=
ramming=2E

Perhaps you could give another examples or two such as us=
ing
=E2=80=98package-derivation=E2=80=99 and =E2=80=98build-derivations=
=E2=80=99, or integration with (guix
swh) as sketched at
<https://=
lists=2Egnu=2Eorg/archive/html/guix-devel/2018-11/msg00285=2Ehtml>,
o=
r uses of =E2=80=98package-input-rewriting=E2=80=99, just to give a feel th=
at it=E2=80=99s
actually useful=2E  ;-)

For the blog we write tex=
t in Markdown and there=E2=80=99s markup to get proper
syntax highlighti=
ng for Scheme=2E  See the =2Emd files at
<https://git=2Esavannah=2Egn=
u=2Eorg/cgit/guix/guix-artwork=2Egit/tree/website/posts>=2E

Also =
I think it=E2=80=99s a good idea to add links to the relevant parts of the<=
br>Guix and Guile manuals so that interested readers know where to find
=
more info about each topic=2E

Thanks for working on it!

Ludo=
=E2=80=99=2E