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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013 Cyril Roelandt <tipecaml@gmail.com>
+;;; 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-system glib-or-gtk)
+ #:use-module (guix store)
+ #:use-module (guix utils)
+ #:use-module (guix derivations)
+ #:use-module (guix build-system)
+ #:use-module (guix build-system gnu)
+ #:use-module (guix packages)
+ #:use-module (ice-9 match)
+ #:export (glib-or-gtk-build
+ glib-or-gtk-build-system))
+
+;; Commentary:
+;;
+;; This build system is an extension of the 'gnu-build-system'. It
+;; accomodates the needs of applications making use of glib or gtk+ (with "or"
+;; to be interpreted in the mathematical sense). This is achieved by adding
+;; two phases run after the 'install' phase:
+;;
+;; 'glib-or-gtk-wrap' phase:
+;;
+;; a) This phase looks for GSettings schemas by verifying the existence of
+;; path "datadir/glib-2.0/schemas" in all input packages. If the path is
+;; found in any package, then all programs in "out/bin" are wrapped in scripts
+;; where the environment variable "XDG_DATA_DIRS" is set and points to the
+;; list of found schemas directories.
+;;
+;; b) Looks for the existence of "libdir/gtk-3.0" directories in all input
+;; packages. If any is found, then the environment variable "GTK_PATH" is
+;; suitably set and added to the wrappers. The variable "GTK_PATH" has been
+;; preferred over "GTK_EXE_PREFIX" because the latter can only point to a
+;; single directory, while we may need to point to several ones.
+;;
+;; 'glib-or-gtk-compile-schemas' phase:
+;;
+;; Looks for the presence of "out/share/glib-2.0/schemas". If that directory
+;; exists and does not include a file named "gschemas.compiled", then
+;; "glib-compile-schemas" is run in that directory.
+;;
+;; Code:
+
+(define %default-modules
+ ;; Build-side modules made available in the build environment.
+ '((guix build glib-or-gtk-build-system)
+ (guix build utils)))
+
+(define %default-imported-modules
+ ;; Build-side modules imported and used by default.
+ '((guix build gnu-build-system)
+ (guix build glib-or-gtk-build-system)
+ (guix build utils)))
+
+(define (default-glib)
+ "Return the default glib package from which we use
+\"glib-compile-schemas\"."
+ ;; Do not use `@' to avoid introducing circular dependencies.
+ (let ((module (resolve-interface '(gnu packages glib))))
+ (module-ref module 'glib)))
+
+(define* (lower name
+ #:key source inputs native-inputs outputs system target
+ (glib (default-glib)) (implicit-inputs? #t)
+ (strip-binaries? #t)
+ #:allow-other-keys
+ #:rest arguments)
+ "Return a bag for NAME."
+ (define private-keywords
+ '(#:source #:target #:glib #:inputs #:native-inputs
+ #:outputs #:implicit-inputs?))
+
+ (and (not target) ;XXX: no cross-compilation
+ (bag
+ (name name)
+ (system system)
+ (host-inputs `(,@(if source
+ `(("source" ,source))
+ '())
+ ,@inputs))
+ (build-inputs `(("glib:bin" ,glib)
+ ,@(if implicit-inputs?
+ (standard-packages)
+ '())
+ ,@native-inputs))
+ (outputs outputs)
+ (build glib-or-gtk-build)
+ (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define* (glib-or-gtk-build store name inputs
+ #:key (guile #f)
+ (outputs '("out"))
+ (search-paths '())
+ (configure-flags ''())
+ (make-flags ''())
+ (out-of-source? #t)
+ (tests? #t)
+ (test-target "check")
+ (parallel-build? #t)
+ (parallel-tests? #t)
+ (patch-shebangs? #t)
+ (strip-binaries? #t)
+ (strip-flags ''("--strip-debug"))
+ (strip-directories ''("lib" "lib64" "libexec"
+ "bin" "sbin"))
+ (phases '(@ (guix build glib-or-gtk-build-system)
+ %standard-phases))
+ (system (%current-system))
+ (imported-modules %default-imported-modules)
+ (modules %default-modules)
+ allowed-references)
+ "Build SOURCE with INPUTS. See GNU-BUILD for more details."
+ (define canonicalize-reference
+ (match-lambda
+ ((? package? p)
+ (derivation->output-path (package-derivation store p system)))
+ (((? package? p) output)
+ (derivation->output-path (package-derivation store p system)
+ output))
+ ((? string? output)
+ output)))
+
+ (define builder
+ `(begin
+ (use-modules ,@modules)
+ (glib-or-gtk-build #:source ,(match (assoc-ref inputs "source")
+ (((? derivation? source))
+ (derivation->output-path source))
+ ((source)
+ source)
+ (source
+ source))
+ #:system ,system
+ #:outputs %outputs
+ #:inputs %build-inputs
+ #:search-paths ',(map search-path-specification->sexp
+ search-paths)
+ #:phases ,phases
+ #:configure-flags ,configure-flags
+ #:make-flags ,make-flags
+ #:out-of-source? ,out-of-source?
+ #:tests? ,tests?
+ #:test-target ,test-target
+ #:parallel-build? ,parallel-build?
+ #:parallel-tests? ,parallel-tests?
+ #:patch-shebangs? ,patch-shebangs?
+ #:strip-binaries? ,strip-binaries?
+ #:strip-flags ,strip-flags
+ #:strip-directories ,strip-directories)))
+
+ (define guile-for-build
+ (match guile
+ ((? package?)
+ (package-derivation store guile system))
+ (#f ; the default
+ (let* ((distro (resolve-interface '(gnu packages commencement)))
+ (guile (module-ref distro 'guile-final)))
+ (package-derivation store guile system)))))
+
+ (build-expression->derivation store name builder
+ #:system system
+ #:inputs inputs
+ #:modules imported-modules
+ #:outputs outputs
+ #:allowed-references
+ (and allowed-references
+ (map canonicalize-reference
+ allowed-references))
+ #:guile-for-build guile-for-build))
+
+(define glib-or-gtk-build-system
+ (build-system
+ (name 'glib-or-gtk)
+ (description
+ "The GNU Build System—i.e., ./configure && make && make install,
+augmented with definition of suitable environment variables for glib and gtk+
+in program wrappers.")
+ (lower lower)))
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