import: git: Do not search pre-release words in tag prefix.

This fixes tags like 'xfce4-dev-tools-4.20.0'.

* tests/import-git.scm ("latest-git-tag-version: prefix contains pre-release
words"): New test.
* guix/import/git.scm (latest-tag): Don't filter out pre-releases tags.
(version-mapping): Filter out pre-releases tags from versions.
* gnu/packages/xfce.scm (garcon, thunar-archive-plugin, xfce4-dev-tools):
Remove FIXME comments for the 'generic-git' updater.

Change-Id: I7683200fa451d7fad153aa08fa9d5761688de01d

gnu/packages/xfce.scm

@@ -374,7 +374,6 @@ (define-public garcon
 library called libxfce4menu, which, in contrast to garcon, was lacking menu
 merging features essential for loading menus modified with menu editors.")
     (license lgpl2.0+)
-    ;; FIXME: the 'generic-git' updater treat "rc" as pre-releases.
     (properties `((release-tag-prefix . ,(string-append name "-"))))))
 
 (define-public tumbler
@@ -915,7 +914,6 @@ (define-public thunar-archive-plugin
     (description "The Thunar Archive Plugin allows you to create and extract
 archive files using the file context menus in the Thunar file manager.")
     (license gpl2+)
-    ;; FIXME: the 'generic-git' updater treat "rc" as pre-releases.
     (properties `((release-tag-prefix . ,(string-append name "-"))))))
 
 (define-public thunar-shares-plugin
@@ -2438,5 +2436,4 @@ (define-public xfce4-dev-tools
 developers and people that want to build Xfce from Git In addition it contains
 the Xfce developer's handbook.")
     (license gpl2+)
-    ;; FIXME: the 'generic-git' updater treat "dev" as pre-releases.
     (properties `((release-tag-prefix . ,(string-append name "-"))))))

guix/import/git.scm

@@ -138,9 +138,16 @@ (define (get-version tag)
   (define (entry<? a b)
     (eq? (version-compare (car a) (car b)) '<))
 
+  (define (pre-release? tag)
+    (any (cut regexp-exec <> tag)
+         %pre-release-rx))
+
   (stable-sort (filter-map (lambda (tag)
                              (let ((version (get-version tag)))
-                               (and version (cons version tag))))
+                               (and version
+                                    (or pre-releases?
+                                        (not (pre-release? version)))
+                                    (cons version tag))))
                            tags)
                entry<?))
 
@@ -149,16 +156,10 @@ (define* (latest-tag url
   "Return the latest version and corresponding tag available from the Git
 repository at URL. Optionally include a VERSION string to fetch a specific
 version."
-  (define (pre-release? tag)
-    (any (cut regexp-exec <> tag)
-         %pre-release-rx))
-
   (let* ((tags (map (cut string-drop <> (string-length "refs/tags/"))
                     (remote-refs url #:tags? #t)))
          (versions->tags
-          (version-mapping (if pre-releases?
-                               tags
-                               (filter (negate pre-release?) tags))
+          (version-mapping tags
                            #:prefix prefix
                            #:suffix suffix
                            #:delim delim

tests/import-git.scm

@@ -224,4 +224,13 @@ (define* (make-package directory version #:optional (properties '()))
     (let ((package (make-package directory "1.0.0")))
       (latest-git-tag-version package))))
 
+(test-equal "latest-git-tag-version: prefix contains pre-release words"
+  "1.0.1"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "libdevx-1.0.1" "Release 1.0.1"))
+    (let ((package (make-package directory "1.0.0")))
+      (latest-git-tag-version package))))
+
 (test-end "git")