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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 Federico Beffa <beffa@fbengineering.ch>
+;;;
+;;; 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 glib-or-gtk-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 regex)
+  #:use-module (srfi srfi-1)
+  #:export (%standard-phases
+            glib-or-gtk-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard glib-or-gtk build procedure.
+;;
+;; Code:
+
+(define (subdirectory-exists? parent sub-directory)
+  (directory-exists? (string-append parent sub-directory)))
+
+(define (directory-included? directory directories-list)
+  "Is DIRECTORY included in DIRECTORIES-LIST?"
+  (fold (lambda (s p) (or (string-ci=? s directory) p)) 
+        #f directories-list))
+
+(define (gtk-module-directories inputs)
+  "Check for the existence of \"libdir/gtk-v.0\" in INPUTS.  Return a list
+with all found directories."
+  (let* ((version 
+          (if (string-match "gtk\\+-3" 
+                            (or (assoc-ref inputs "gtk+")
+                                (assoc-ref inputs "source")
+                                "gtk+-3")) ; we default to version 3
+              "3.0"
+              "2.0"))
+         (gtk-module
+          (lambda (input prev)
+            (let* ((in (match input
+                         ((_ . dir) dir)
+                         (_ "")))
+                   (libdir 
+                    (string-append in "/lib/gtk-" version)))
+              (if (and (directory-exists? libdir)
+                       (not (directory-included? libdir prev)))
+                  (cons libdir prev)
+                  prev)))))
+    (fold gtk-module '() inputs)))
+
+(define (schemas-directories inputs)
+  "Check for the existence of \"datadir/glib-2.0/schemas\" in INPUTS.  Return
+a list with all found directories."
+  (define (glib-schemas input previous)
+    (let* ((in (match input
+                 ((_ . dir) dir)
+                 (_ "")))
+           (datadir (string-append in "/share")))
+      (if (and (subdirectory-exists? datadir "/glib-2.0/schemas")
+               (not (directory-included? datadir previous)))
+          (cons datadir previous)
+          previous)))
+
+  (fold glib-schemas '() inputs))
+
+(define* (wrap-all-programs #:key inputs outputs #:allow-other-keys)
+  "Implement phase \"glib-or-gtk-wrap\": look for GSettings schemas and
+gtk+-v.0 libraries and create wrappers with suitably set environment variables
+if found."
+  (let* ((out (assoc-ref outputs "out"))
+         (bindir (string-append out "/bin"))
+         (bin-list (find-files bindir ".*"))
+         (schemas (schemas-directories (acons "out" out inputs)))
+         (schemas-env-var 
+          (if (not (null? schemas))
+              `("XDG_DATA_DIRS" ":" prefix ,schemas)
+              #f))
+         (gtk-mod-dirs (gtk-module-directories (acons "out" out inputs)))
+         (gtk-mod-env-var 
+          (if (not (null? gtk-mod-dirs))
+              `("GTK_PATH" ":" prefix ,gtk-mod-dirs)
+              #f)))
+    (cond
+     ((and schemas-env-var gtk-mod-env-var)
+      (map (lambda (prog) 
+             (wrap-program prog schemas-env-var gtk-mod-env-var))
+           bin-list))
+     (schemas-env-var
+      (map (lambda (prog) (wrap-program prog schemas-env-var)) bin-list))
+     (gtk-mod-env-var
+      (map (lambda (prog) (wrap-program prog gtk-mod-env-var)) bin-list)))))
+
+(define* (compile-glib-schemas #:key inputs outputs #:allow-other-keys)
+  "Implement phase \"glib-or-gtk-compile-schemas\": compile \"glib\" schemas
+if needed."
+  (let* ((out (assoc-ref outputs "out"))
+         (schemasdir (string-append out "/share/glib-2.0/schemas")))
+    (if (and (directory-exists? schemasdir)
+             (not (file-exists? 
+                   (string-append schemasdir "/gschemas.compiled"))))
+        (system* "glib-compile-schemas" schemasdir)
+        #t)))
+
+(define %standard-phases
+  (alist-cons-after
+   'install 'glib-or-gtk-wrap wrap-all-programs 
+   (alist-cons-after 
+    'install 'glib-or-gtk-compile-schemas compile-glib-schemas 
+    gnu:%standard-phases)))
+
+(define* (glib-or-gtk-build #:key inputs (phases %standard-phases)
+                            #:allow-other-keys #:rest args)
+  "Build the given package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; glib-or-gtk-build-system.scm ends here