2 files changed, 15 insertions(+), 6 deletions(-)

M doc/guix.texi
M gnu/packages.scm

@@ 1742,18 1742,17 @@ of packages:
        (list guile-2.0 "debug")))
 @end example
 
-@findex specification->package+output
+@findex specifications->manifest
 In this example we have to know which modules define the @code{emacs}
 and @code{guile-2.0} variables to provide the right
 @code{use-package-modules} line, which can be cumbersome.  We can
 instead provide regular package specifications and let
-@code{specification->package-output} look up the corresponding package
+@code{specifications->manifest} look up the corresponding package
 objects, like this:
 
 @example
-(packages->manifest
- (map (compose list specification->package+output)
-      '("emacs" "guile@@2.0" "guile@@2.0:debug")))
+(specifications->manifest
+ '("emacs" "guile@@2.2" "guile@@2.2:debug"))
 @end example
 
 @item --roll-back

@@ 29,6 29,7 @@
   #:use-module ((guix build utils)
                 #:select ((package-name->name+version
                            . hyphen-separated-name->name+version)))
+  #:autoload   (guix profiles) (packages->manifest)
   #:use-module (ice-9 vlist)
   #:use-module (ice-9 match)
   #:use-module (srfi srfi-1)


@@ 53,7 54,8 @@
             find-newest-available-packages
 
             specification->package
-            specification->package+output))
+            specification->package+output
+            specifications->manifest))
 
 ;;; Commentary:
 ;;;


@@ 278,3 280,11 @@ version; if SPEC does not specify an output, return OUTPUT."
            (leave (G_ "package `~a' lacks output `~a'~%")
                   (package-full-name package)
                   sub-drv))))))
+
+(define (specifications->manifest specs)
+  "Given SPECS, a list of specifications such as \"emacs@25.2\" or
+\"guile:debug\", return a profile manifest."
+  ;; This procedure exists mostly so users of 'guix package -m' don't have to
+  ;; fiddle with multiple-value returns.
+  (packages->manifest
+   (map (compose list specification->package+output) specs)))