Add (guix discovery).

* guix/discovery.scm, tests/discovery.scm: New files.
* gnu/packages.scm (scheme-files, file-name->module-name)
(scheme-modules, all-package-modules): Remove.
(fold-packages): Rewrite in terms of 'fold-module-public-variables'.
* gnu/tests.scm: Use (guix discovery).
* Makefile.am (MODULES): Add guix/discovery.scm.
(SCM_TESTS): Add tests/discovery.scm.

1 files changed, 52 insertions, 0 deletions

diff --git a/tests/discovery.scm b/tests/discovery.scm
new file mode 100644
index 0000000000..b838731e16
--- /dev/null
+++ b/tests/discovery.scm
@@ -0,0 +1,52 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (test-discovery)
+  #:use-module (guix discovery)
+  #:use-module (guix build-system)
+  #:use-module (srfi srfi-64)
+  #:use-module (ice-9 match))
+
+(define %top-srcdir
+  (dirname (search-path %load-path "guix.scm")))
+
+(test-begin "discovery")
+
+(test-assert "scheme-modules"
+  (match (map module-name (scheme-modules %top-srcdir "guix/import"))
+    ((('guix 'import _ ...) ..1)
+     #t)))
+
+(test-assert "all-modules"
+  (match (map module-name
+              (all-modules `((,%top-srcdir . "guix/build-system"))))
+    ((('guix 'build-system names) ..1)
+     names)))
+
+(test-assert "fold-module-public-variables"
+  (let ((modules (all-modules `((,%top-srcdir . "guix/build-system")))))
+    (match (fold-module-public-variables (lambda (obj result)
+                                           (if (build-system? obj)
+                                               (cons obj result)
+                                               result))
+                                         '()
+                                         modules)
+      (((? build-system? bs) ..1)
+       bs))))
+
+(test-end "discovery")