monads: Move '%store-monad' and related procedures where they belong.

This turns (guix monads) into a generic module for monads, and moves the
store monad and related monadic procedures in their corresponding
module.

* guix/monads.scm (store-return, store-bind, %store-monad, store-lift,
  text-file, interned-file, package-file, package->derivation,
  package->cross-derivation, origin->derivation, imported-modules,
  compiled, modules, built-derivations, run-with-store): Move to...
* guix/store.scm (store-return, store-bind, %store-monad, store-lift,
  text-file, interned-file): ... here.
  (%guile-for-build): New variable.
  (run-with-store): Moved from monads.scm.  Remove default value for
  #:guile-for-build.
* guix/packages.scm (default-guile): Export.
  (set-guile-for-build): New procedure.
  (package-file, package->derivation, package->cross-derivation,
  origin->derivation): Moved from monads.scm.
* guix/derivations.scm (%guile-for-build): Remove.
  (imported-modules): Rename to...
  (%imported-modules): ... this.
  (compiled-modules): Rename to...
  (%compiled-modules): ... this.
  (built-derivations, imported-modules, compiled-modules): New
  procedures.
* gnu/services/avahi.scm, gnu/services/base.scm, gnu/services/dbus.scm,
  gnu/services/dmd.scm, gnu/services/networking.scm,
  gnu/services/ssh.scm, gnu/services/xorg.scm, gnu/system/install.scm,
  gnu/system/linux-initrd.scm, gnu/system/shadow.scm, guix/download.scm,
  guix/gexp.scm, guix/git-download.scm, guix/profiles.scm,
  guix/svn-download.scm, tests/monads.scm: Adjust imports accordingly.
* guix/monad-repl.scm (default-guile-derivation): New procedure.
  (store-monad-language, run-in-store): Use it.
* build-aux/hydra/gnu-system.scm (qemu-jobs): Add explicit
  'set-guile-for-build' call.
* guix/scripts/archive.scm (derivation-from-expression): Likewise.
* guix/scripts/build.scm (options/resolve-packages): Likewise.
* guix/scripts/environment.scm (guix-environment): Likewise.
* guix/scripts/system.scm (guix-system): Likewise.
* doc/guix.texi (The Store Monad): Adjust module names accordingly.

1 files changed, 7 insertions, 4 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 5f25583906..c052804a45 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -2194,8 +2194,8 @@ scheme@@(guile-user)>
 Note that non-monadic values cannot be returned in the
 @code{store-monad} REPL.
 
-The main syntactic forms to deal with monads in general are described
-below.
+The main syntactic forms to deal with monads in general are provided by
+the @code{(guix monads)} module and are described below.
 
 @deffn {Scheme Syntax} with-monad @var{monad} @var{body} ...
 Evaluate any @code{>>=} or @code{return} forms in @var{body} as being
@@ -2235,8 +2235,8 @@ monadic expressions are ignored.  In that sense, it is analogous to
 @code{begin}, but applied to monadic expressions.
 @end deffn
 
-The interface to the store monad provided by @code{(guix monads)} is as
-follows.
+The main interface to the store monad, provided by the @code{(guix
+store)} module, is as follows.
 
 @defvr {Scheme Variable} %store-monad
 The store monad.  Values in the store monad encapsulate accesses to the
@@ -2278,6 +2278,9 @@ The example below adds a file to the store, under two different names:
 
 @end deffn
 
+The @code{(guix packages)} module exports the following package-related
+monadic procedures:
+
 @deffn {Monadic Procedure} package-file @var{package} [@var{file}] @
        [#:system (%current-system)] [#:target #f] @
        [#:output "out"] Return as a monadic