gexp: Add 'with-imported-modules' macro.

* guix/gexp.scm (<gexp>)[modules]: New field.
(gexp-modules): New procedure.
(gexp->derivation): Use it and append the result to %MODULES.
Update docstring to mark #:modules as deprecated.
(current-imported-modules, with-imported-modules): New macros.
(gexp): Pass CURRENT-IMPORTED-MODULES as second argument to 'gexp'.
(gexp->script): Use and honor 'gexp-modules'; define '%modules'.
* tests/gexp.scm ("gexp->derivation & with-imported-modules")
("gexp->derivation & nested with-imported-modules")
("gexp-modules & ungexp", "gexp-modules & ungexp-splicing"):
New tests.
("program-file"): Use 'with-imported-modules'.  Remove #:modules
argument to 'program-file'.
* doc/guix.texi (G-Expressions): Document 'with-imported-modules'.
Mark #:modules of 'gexp->derivation' as deprecated.
* emacs/guix-devel.el: Add syntax for 'with-imported-modules'.
(guix-devel-keywords): Add it.
* .dir-locals.el: Likewise.

1 files changed, 2 insertions, 0 deletions

diff --git a/emacs/guix-devel.el b/emacs/guix-devel.el
index ee8371ce81..b71670cdfb 100644
--- a/emacs/guix-devel.el
+++ b/emacs/guix-devel.el
@@ -216,6 +216,7 @@ to find 'modify-phases' keywords."
     "with-derivation-substitute"
     "with-directory-excursion"
     "with-error-handling"
+    "with-imported-modules"
     "with-monad"
     "with-mutex"
     "with-store"))
@@ -306,6 +307,7 @@ Each rule should have a form (SYMBOL VALUE).  See `put' for details."
   (with-derivation-substitute 2)
   (with-directory-excursion 1)
   (with-error-handling 0)
+  (with-imported-modules 1)
   (with-monad 1)
   (with-mutex 1)
   (with-store 1)