[PATCH] package: allow users to upgrade the whole system by not providing a regexp.

[Cyril Roelandt <tipecaml@gmail.com>]

'guix package --upgrade' is now the same as "guix package --upgrade=''".
---
 doc/guix.texi            |    7 ++++---
 guix/scripts/package.scm |    6 +++---
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index c91bc20..d69b7d0 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -537,9 +537,10 @@ multiple-output package.
 @itemx -r @var{package}
 Remove @var{package}.
 
-@item --upgrade=@var{regexp}
-@itemx -u @var{regexp}
-Upgrade all the installed packages matching @var{regexp}.
+@item --upgrade[=@var{regexp}]
+@itemx -u [@var{regexp}]
+Upgrade all the installed packages. When @var{regexp} is specified, upgrade only
+installed packages whose name matches @var{regexp}.
 
 Note that this upgrades package to the latest version of packages found
 in the distribution currently installed.  To update your distribution,
diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm
index ac99d16..5b340c6 100644
--- a/guix/scripts/package.scm
+++ b/guix/scripts/package.scm
@@ -328,7 +328,7 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
   (display (_ "
   -r, --remove=PACKAGE   remove PACKAGE"))
   (display (_ "
-  -u, --upgrade=REGEXP   upgrade all the installed packages matching REGEXP"))
+  -u, --upgrade[=REGEXP] upgrade all the installed packages matching REGEXP"))
   (display (_ "
       --roll-back        roll back to the previous generation"))
   (newline)
@@ -379,7 +379,7 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
         (option '(#\r "remove") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'remove arg result)))
-        (option '(#\u "upgrade") #t #f
+        (option '(#\u "upgrade") #f #t
                 (lambda (opt name arg result)
                   (alist-cons 'upgrade arg result)))
         (option '("roll-back") #f #f
@@ -602,7 +602,7 @@ Install, remove, or upgrade PACKAGES in a single transaction.\n"))
         (let* ((installed (manifest-packages (profile-manifest profile)))
                (upgrade-regexps (filter-map (match-lambda
                                              (('upgrade . regexp)
-                                              (make-regexp regexp))
+                                              (make-regexp (or regexp "")))
                                              (_ #f))
                                             opts))
                (upgrade  (if (null? upgrade-regexps)
-- 
1.7.10.4