Subject: bug#27275: [PATCH 1/2] pull: Add a dependency to guile-git.

From: Mathieu Othacehe <[email-masked]>
Date: Thu, 08 Jun 2017 16:49:15 +0200

Hi Ludo !

> Maybe with a macro along these lines:

Nice, thanks !

I attached the patch I come up with. It's working ok :)
I have a shorter version using match :

--8<---------------cut here---------------start------------->8---
(letrec-syntax ((maybe-load-paths
                 (syntax-rules ()
                   ((_ item rest ...)
                    (let ((tail (maybe-load-paths rest ...)))
                      (if (string? item)
                          (match tail
                            ((load-path load-compiled-path)
                            (list
                             (cons (string-append item
                                                  "/share/guile/site/"
                                                  #$(effective-version))
                                   load-path)
                             (cons (string-append item
                                                  "/lib/guile/"
                                                  #$(effective-version)
                                                  "/site-ccache")
                                   load-compiled-path))))
                          tail)))
                   ((_)
                    '(() ())))))
  (match (maybe-load-paths #$guile-json #$guile-ssh
                           #$guile-git #$guile-bytestructures)
    ((module-load-path module-load-compiled-path)
     (set! %load-path (append module-load-path %load-path)
     (set! %load-compiled-path (append module-load-compiled-path %load-compiled-path))))))
--8<---------------cut here---------------end--------------->8---

It might seems preferable but I can't get guix-latest derivation to
include (ice-9 match), maybe because of #:module-path in
"(gexp->derivation "guix-latest" ...".

Mathieu
>From 1130f8eafdb27216fc542bff253a940528bedc6a Mon Sep 17 00:00:00 2001
From: Mathieu Othacehe <[email-masked]>
Date: Wed, 7 Jun 2017 13:44:47 +0200
Subject: [PATCH 2/2] pull: Add a dependency to guile-git.

* build-aux/build-self.scm (guile-git, guile-bytestructures): New
  variables.
  (build): Add guile-git and guile-bytestructures to %load-path and
  %load-compiled-path.
---
 build-aux/build-self.scm | 52 ++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 41 insertions(+), 11 deletions(-)

diff --git a/build-aux/build-self.scm b/build-aux/build-self.scm
index a1335fea1..8fb9af23c 100644
--- a/build-aux/build-self.scm
+++ b/build-aux/build-self.scm
@@ -97,6 +97,13 @@ Guile major version (2.0 or 2.2), or #f if none of the packages matches."
                              "guile2.2-ssh"
                              "guile2.0-ssh"))
 
+(define guile-git
+  (package-for-current-guile "guile-git"
+                             "guile2.0-git"))
+
+(define guile-bytestructures
+  (package-for-current-guile "guile-bytestructures"
+                             "guile2.0-bytestructures"))
 
 ;; The actual build procedure.
 
@@ -148,19 +155,42 @@ files."
     #~(begin
         (use-modules (guix build pull))
 
-        (let ((json (string-append #$guile-json "/share/guile/site/"
-                                   #$(effective-version))))
+        (letrec-syntax ((maybe-load-path
+                         (syntax-rules ()
+                           ((_ item rest ...)
+                            (let ((tail (maybe-load-path rest ...)))
+                              (if (string? item)
+                                  (cons (string-append item
+                                                       "/share/guile/site/"
+                                                       #$(effective-version))
+                                        tail)
+                                  tail)))
+                           ((_)
+                            '()))))
           (set! %load-path
-            (cons* json
-                   (string-append #$guile-ssh "/share/guile/site/"
-                                  #$(effective-version))
-                   %load-path))
+                (append
+                 (maybe-load-path #$guile-json #$guile-ssh
+                                  #$guile-git #$guile-bytestructures)
+                 %load-path)))
+
+        (letrec-syntax ((maybe-load-compiled-path
+                         (syntax-rules ()
+                           ((_ item rest ...)
+                            (let ((tail (maybe-load-compiled-path rest ...)))
+                              (if (string? item)
+                                  (cons (string-append item
+                                                       "/lib/guile/"
+                                                       #$(effective-version)
+                                                       "/site-ccache")
+                                        tail)
+                                  tail)))
+                           ((_)
+                            '()))))
           (set! %load-compiled-path
-            (cons* json
-                   (string-append #$guile-ssh "/lib/guile/"
-                                  #$(effective-version)
-                                  "/site-ccache")
-                   %load-compiled-path)))
+                (append
+                 (maybe-load-compiled-path #$guile-json #$guile-ssh
+                                           #$guile-git #$guile-bytestructures)
+                 %load-compiled-path)))
 
         ;; XXX: The 'guile-ssh' package prior to Guix commit 92b7258 was
         ;; broken: libguile-ssh could not be found.  Work around that.
-- 
2.13.1