bug#26339: [PATCH 09/18] scripts: system: Move save-load-path-excursion and save-environment-excursion macros to the top.

[Mathieu Othacehe]

* guix/scripts/system.scm (save-load-path-excursion,
save-environment-excursion): Move definitions to the top of the file.
It allows to use them in the whole file.
---
 guix/scripts/system.scm | 47 ++++++++++++++++++++++++-----------------------
 1 file changed, 24 insertions(+), 23 deletions(-)

diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index 04274919e..2ad210207 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -2,6 +2,7 @@
 ;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <address@hidden>
 ;;; Copyright © 2016 Alex Kost <address@hidden>
 ;;; Copyright © 2016 Chris Marusich <address@hidden>
+;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -77,6 +78,29 @@
 ;;; Installation.
 ;;;
 
+(define-syntax-rule (save-load-path-excursion body ...)
+  "Save the current values of '%load-path' and '%load-compiled-path', run
+BODY..., and restore them."
+  (let ((path %load-path)
+        (cpath %load-compiled-path))
+    (dynamic-wind
+      (const #t)
+      (lambda ()
+        body ...)
+      (lambda ()
+        (set! %load-path path)
+        (set! %load-compiled-path cpath)))))
+
+(define-syntax-rule (save-environment-excursion body ...)
+  "Save the current environment variables, run BODY..., and restore them."
+  (let ((env (environ)))
+    (dynamic-wind
+      (const #t)
+      (lambda ()
+        body ...)
+      (lambda ()
+        (environ env)))))
+
 (define topologically-sorted*
   (store-lift topologically-sorted))
 
@@ -201,29 +225,6 @@ the ownership of '~a' may be incorrect!~%")
   ;; The system profile.
   (string-append %state-directory "/profiles/system"))
 
-(define-syntax-rule (save-environment-excursion body ...)
-  "Save the current environment variables, run BODY..., and restore them."
-  (let ((env (environ)))
-    (dynamic-wind
-      (const #t)
-      (lambda ()
-        body ...)
-      (lambda ()
-        (environ env)))))
-
-(define-syntax-rule (save-load-path-excursion body ...)
-  "Save the current values of '%load-path' and '%load-compiled-path', run
-BODY..., and restore them."
-  (let ((path %load-path)
-        (cpath %load-compiled-path))
-    (dynamic-wind
-      (const #t)
-      (lambda ()
-        body ...)
-      (lambda ()
-        (set! %load-path path)
-        (set! %load-compiled-path cpath)))))
-
 (define-syntax-rule (with-shepherd-error-handling mbody ...)
   "Catch and report Shepherd errors that arise when binding MBODY, a monadic
 expression in %STORE-MONAD."
-- 
2.12.2