guix: Add java-utils.

* guix/build/java-utils.scm: New file.
* guix/build-system/ant.scm: Use it.
* Makefile.am (MODULES): Add it.

Co-authored-by: Ricardo Wurmus <rekado@elephly.net>

Makefile.am

@@ -124,6 +124,7 @@ MODULES =					\
   guix/build/syscalls.scm                       \
   guix/build/gremlin.scm			\
   guix/build/emacs-utils.scm			\
+  guix/build/java-utils.scm			\
   guix/build/lisp-utils.scm			\
   guix/build/graft.scm				\
   guix/build/bournish.scm			\

guix/build-system/ant.scm

@@ -39,6 +39,7 @@
 (define %ant-build-system-modules
   ;; Build-side modules imported by default.
   `((guix build ant-build-system)
+    (guix build java-utils)
     (guix build syscalls)
     ,@%gnu-build-system-modules))
 
@@ -108,6 +109,7 @@
                     (guile #f)
                     (imported-modules %ant-build-system-modules)
                     (modules '((guix build ant-build-system)
+                               (guix build java-utils)
                                (guix build utils))))
   "Build SOURCE with INPUTS."
   (define builder

guix/build/java-utils.scm

@@ -0,0 +1,55 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Hartmut Goebel <h.goebel@crazy-compilers.com>
+;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build java-utils)
+  #:use-module (guix build utils)
+  #:export (ant-build-javadoc
+            install-jars
+            install-javadoc))
+
+;; Copied from haskell-build-system.scm
+(define (package-name-version store-dir)
+  "Given a store directory STORE-DIR return 'name-version' of the package."
+  (let* ((base (basename store-dir)))
+    (string-drop base (+ 1 (string-index base #\-)))))
+
+(define* (ant-build-javadoc #:key (target "javadoc") (make-flags '())
+                            #:allow-other-keys)
+  (zero? (apply system* `("ant" ,target ,@make-flags))))
+
+(define* (install-jars jar-directory)
+  "Install jar files from JAR-DIRECTORY to the default target directory.  This
+is used in case the build.xml does not include an install target."
+  (lambda* (#:key outputs #:allow-other-keys)
+    (let ((share (string-append (assoc-ref outputs "out")
+                                "/share/java")))
+      (for-each (lambda (f) (install-file f share))
+                (find-files jar-directory "\\.jar$"))
+      #t)))
+
+(define* (install-javadoc apidoc-directory)
+  "Install the APIDOC-DIRECTORY to the target directory.  This is used to
+install javadocs when this is not done by the install target."
+  (lambda* (#:key outputs #:allow-other-keys)
+    (let* ((out (assoc-ref outputs "out"))
+           (docs (string-append (or (assoc-ref outputs "doc") out)
+                                "/share/doc/" (package-name-version out) "/")))
+      (mkdir-p docs)
+      (copy-recursively apidoc-directory docs)
+      #t)))