From 023d9892c0411adb523e6bc8337be3e7e94e606f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Wed, 14 Jan 2015 14:25:58 +0100
Subject: [PATCH] store: Add 'store-lower'.
* guix/store.scm (store-lower): New procedure.
* tests/store.scm ("store-lower"): New test.
---
guix/store.scm | 7 +++++++
tests/store.scm | 8 +++++++-
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/guix/store.scm b/guix/store.scm
index d3e94625a7e..82ed94bbc10 100644
--- a/guix/store.scm
+++ b/guix/store.scm
@@ -99,6 +99,7 @@ (define-module (guix store)
store-bind
store-return
store-lift
+ store-lower
run-with-store
%guile-for-build
text-file
@@ -881,6 +882,12 @@ (define result
(procedure-property proc 'documentation))
result)
+(define (store-lower proc)
+ "Lower PROC, a monadic procedure in %STORE-MONAD, to a \"normal\" procedure
+taking the store as its first argument."
+ (lambda (store . args)
+ (run-with-store store (apply proc args))))
+
;;
;; Store monad operators.
;;
diff --git a/tests/store.scm b/tests/store.scm
index cb5370d5cca..f43fcb14d00 100644
--- a/tests/store.scm
+++ b/tests/store.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -595,6 +595,12 @@ (define (same? x y)
(null? (valid-derivers %store file))
(null? (referrers %store file))))))
+(test-equal "store-lower"
+ "Lowered."
+ (let* ((add (store-lower text-file))
+ (file (add %store "foo" "Lowered.")))
+ (call-with-input-file file get-string-all)))
+
(test-end "store")
--
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