gnu: Add stb-image.

* gnu/packages/stb.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Register it.

gnu/local.mk

@@ -403,6 +403,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/sssd.scm				\
   %D%/packages/stalonetray.scm			\
   %D%/packages/statistics.scm			\
+  %D%/packages/stb.scm				\
   %D%/packages/storage.scm			\
   %D%/packages/suckless.scm			\
   %D%/packages/swig.scm				\

gnu/packages/stb.scm

@@ -0,0 +1,97 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Marius Bakke <mbakke@fastmail.com>
+;;;
+;;; 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 (gnu packages stb)
+  #:use-module (guix packages)
+  #:use-module (guix git-download)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix build-system trivial)
+  #:use-module ((guix licenses) #:select (expat public-domain)))
+
+(define stb
+  ;; stb is a collection of libraries developed within the same repository.
+  ;; When updating this, remember to change versions below as appropriate.
+  (let ((commit "e6afb9cbae4064da8c3e69af3ff5c4629579c1d2")
+        (revision "0"))
+    (package
+      (name "stb")
+      (home-page "https://github.com/nothings/stb")
+      (version (git-version "0.0" revision commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url home-page)
+                      (commit commit)))
+                (sha256
+                 (base32
+                  "079nsn9bnb8c0vfq26g5l53q6gzx19a5x9q2nb55mpcljxsgxnmf"))
+                (file-name (git-file-name name version))))
+      (build-system gnu-build-system)
+      (arguments
+       `(#:modules ((ice-9 ftw)
+                    (ice-9 regex)
+                    (srfi srfi-26)
+                    ,@%gnu-build-system-modules)
+         #:phases (modify-phases %standard-phases
+                    (delete 'configure)
+                    (delete 'build)
+                    (replace 'check
+                      (lambda _
+                        (invoke "make" "-C" "tests" "CC=gcc")))
+                    (replace 'install
+                      (lambda* (#:key outputs #:allow-other-keys)
+                        (let ((out (assoc-ref outputs "out"))
+                              (files (make-regexp "\\.(c|h|md)$")))
+                          (for-each (lambda (file)
+                                      (install-file file out))
+                                    (scandir "." (cut regexp-exec files <>)))
+                          #t))))))
+      (synopsis "Single file libraries for C/C++")
+      (description
+       "This package contains a variety of small independent libraries for
+the C programming language.")
+      ;; The user can choose either license.
+      (license (list expat public-domain)))))
+
+(define (make-stb-header-package name version description)
+  (package
+    (inherit stb)
+    (name name)
+    (version version)
+    (source #f)
+    (inputs `(("stb" ,stb)))
+    (build-system trivial-build-system)
+    (arguments
+     `(#:modules ((guix build utils))
+       #:builder (begin
+                   (use-modules (guix build utils))
+                   (let ((stb (assoc-ref %build-inputs "stb"))
+                         (lib (string-join (string-split ,name #\-) "_"))
+                         (out (assoc-ref %outputs "out")))
+                     (install-file (string-append stb "/" lib ".h")
+                                   (string-append out "/include"))
+                     #t))))
+    (description description)))
+
+;; TODO: These descriptions are not translatable!  They should be
+;; converted to macros as outlined in <https://bugs.gnu.org/32155>.
+(define-public stb-image
+  (make-stb-header-package
+   "stb-image" "2.19"
+   "stb-image is a small and self-contained library for image loading or
+decoding from file or memory.  A variety of formats are supported."))