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authorLudovic Courtès <ludo@gnu.org>2016-09-04 23:41:53 +0200
committerLudovic Courtès <ludo@gnu.org>2016-09-05 00:06:47 +0200
commit7ca87354db53fd1e1a7a3dfeddb9a598ea064bbe (patch)
treeb33102eb8ca8cfb2999f0da2f3d78acf0f1b80e7 /doc
parent2ff0da025745dd4ddce45d34c89fdf39190f9104 (diff)
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Add (guix modules).
* guix/modules.scm, tests/modules.scm: New files. * Makefile.am (MODULES, SCM_TESTS): Add them. * doc/guix.texi (G-Expressions): Add an example of 'source-module-closure'.
Diffstat (limited to 'doc')
-rw-r--r--doc/guix.texi22
1 files changed, 22 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index d6c041862d..b6ca34a2f3 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -3825,6 +3825,28 @@ In this example, the @code{(guix build utils)} module is automatically
pulled into the isolated build environment of our gexp, such that
@code{(use-modules (guix build utils))} works as expected.
+@cindex module closure
+@findex source-module-closure
+Usually you want the @emph{closure} of the module to be imported---i.e.,
+the module itself and all the modules it depends on---rather than just
+the module; failing to do that, attempts to use the module will fail
+because of missing dependent modules. The @code{source-module-closure}
+procedure computes the closure of a module by looking at its source file
+headers, which comes in handy in this case:
+
+@example
+(use-modules (guix modules)) ;for 'source-module-closure'
+
+(with-imported-modules (source-module-closure
+ '((guix build utils)
+ (gnu build vm)))
+ (gexp->derivation "something-with-vms"
+ #~(begin
+ (use-modules (guix build utils)
+ (gnu build vm))
+ @dots{})))
+@end example
+
The syntactic form to construct gexps is summarized below.
@deffn {Scheme Syntax} #~@var{exp}