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;;; Chickadee Game Toolkit
;;; Copyright © 2016 David Thompson <dthompson2@worcester.edu>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; Commentary:
;;
;; Build time configuration.
;;
;;; Code:
(define-module (chickadee config)
#:use-module (ice-9 match)
#:use-module (system foreign)
#:export (dynamic-link*
%datadir
%chickadee-version
%libpng
%libpng-version
%libturbojpeg
%libopenal
%libvorbisfile
%libmpg123
%libfreetype
%libreadline
scope-datadir))
;; Try to link against multiple library possibilities, such as the
;; absolute file name discovered by ./configure or by searching the
;; library load path as a fallback method. Useful when distributing
;; relocatable builds.
(define (dynamic-link* names)
(let loop ((names* names))
(match names*
(()
(error "could not find library" names))
((name . rest)
(or (false-if-exception (dynamic-link name))
(loop rest))))))
(define %datadir
(or (getenv "CHICKADEE_DATADIR") "@chickadee_datadir@/chickadee"))
(define %chickadee-version "@PACKAGE_VERSION@")
;; The version of libpng that chickadee was built against. Used for
;; initializing libpng.
(define %libpng-version "@PNG_VERSION@")
;; When LD_LIBRARY_PATH is set, we *don't* want to use the absolute
;; file name of the library that pkgconfig found. Instead, we want to
;; use the library name itself so the search path is used.
(define-syntax-rule (define-library-name name
(absolute ...)
(relative ...))
(define name
(cond
((getenv "LD_LIBRARY_PATH")
'(relative ...))
(else
'(absolute ...)))))
(define-library-name %libpng
("@PNG_LIBDIR@/libpng")
("libpng"))
(define-library-name %libturbojpeg
("@TURBOJPEG_LIBDIR@/libturbojpeg")
("libturbojpeg"))
(define-library-name %libopenal
("@OPENAL_LIBDIR@/libopenal")
("libopenal"))
(define-library-name %libvorbisfile
("@VORBIS_LIBDIR@/libvorbisfile")
("libvorbisfile"))
(define-library-name %libmpg123
("@MPG123_LIBDIR@/libmpg123")
("libmpg123"))
(define-library-name %libfreetype
("@FREETYPE_LIBDIR@/libfreetype")
("libfreetype"))
(define-library-name %libreadline
("@READLINE_LIBDIR@/libreadline")
("libreadline"))
(define (scope-datadir file)
"Append the Chickadee data directory to FILE."
(string-append %datadir "/" file))
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