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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 David Craven <david@craven.ch>
+;;; Copyright © 2017 Danny Milosavljevic <dannym@scratchpost.org>
+;;;
+;;; 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 dub-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build syscalls)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 popen)
+  #:use-module (ice-9 rdelim)
+  #:use-module (ice-9 ftw)
+  #:use-module (ice-9 format)
+  #:use-module (ice-9 match)
+  #:use-module (rnrs io ports)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%standard-phases
+            dub-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the DUB (the build tool for D) build system.
+;;
+;; Code:
+
+;; FIXME: Needs to be parsed from url not package name.
+(define (package-name->d-package-name name)
+  "Return the package name of NAME."
+  (match (string-split name #\-)
+    (("d" rest ...)
+     (string-join rest "-"))
+    (_ #f)))
+
+(define* (configure #:key inputs #:allow-other-keys)
+  "Prepare one new directory with all the required dependencies.
+   It's necessary to do this (instead of just using /gnu/store as the
+   directory) because we want to hide the libraries in subdirectories
+   lib/dub/... instead of polluting the user's profile root."
+  (let* ((dir (mkdtemp! "/tmp/dub.XXXXXX"))
+         (vendor-dir (string-append dir "/vendor")))
+    (setenv "HOME" dir)
+    (mkdir vendor-dir)
+    (for-each
+      (match-lambda
+        ((name . path)
+         (let* ((d-package (package-name->d-package-name name))
+                (d-basename (basename path)))
+           (when (and d-package path)
+             (match (string-split (basename path) #\-)
+               ((_ ... version)
+                (symlink (string-append path "/lib/dub/" d-basename)
+                         (string-append vendor-dir "/" d-basename))))))))
+      inputs)
+    (zero? (system* "dub" "add-path" vendor-dir))))
+
+(define (grep string file-name)
+  "Find the first occurence of STRING in the file named FILE-NAME.
+   Return the position of this occurence, or #f if none was found."
+  (string-contains (call-with-input-file file-name get-string-all)
+                   string))
+
+(define (grep* string file-name)
+  "Find the first occurence of STRING in the file named FILE-NAME.
+   Return the position of this occurence, or #f if none was found.
+   If the file named FILE-NAME doesn't exist, return #f."
+  (catch 'system-error
+    (lambda ()
+      (grep string file-name))
+    (lambda args
+      #f)))
+
+(define* (build #:key (dub-build-flags '())
+                #:allow-other-keys)
+  "Build a given DUB package."
+  (if (or (grep* "sourceLibrary" "package.json")
+          (grep* "sourceLibrary" "dub.sdl") ; note: format is different!
+          (grep* "sourceLibrary" "dub.json"))
+    #t
+    (let ((status (zero? (apply system* `("dub" "build" ,@dub-build-flags)))))
+      (system* "dub" "run") ; might fail for "targetType": "library"
+      status)))
+
+(define* (check #:key tests? #:allow-other-keys)
+  (if tests?
+    (zero? (system* "dub" "test"))
+    #t))
+
+(define* (install #:key inputs outputs #:allow-other-keys)
+  "Install a given DUB package."
+  (let* ((out (assoc-ref outputs "out"))
+         (outbin (string-append out "/bin"))
+         (outlib (string-append out "/lib/dub/" (basename out))))
+    (mkdir-p outbin)
+    ;; TODO remove "-test-application"
+    (copy-recursively "bin" outbin)
+    (mkdir-p outlib)
+    (copy-recursively "." (string-append outlib))
+    #t))
+
+(define %standard-phases
+  (modify-phases gnu:%standard-phases
+    (replace 'configure configure)
+    (replace 'build build)
+    (replace 'check check)
+    (replace 'install install)))
+
+(define* (dub-build #:key inputs (phases %standard-phases)
+                      #:allow-other-keys #:rest args)
+  "Build the given DUB package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))