pffi guile example

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+#| Copyright (C) 2025 Peter McGoron
+ |
+ | This program 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.
+ |
+ | This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+ |#
+
+(use-modules (gnu packages guile)
+             (guix build-system copy)
+             (guix git-download)
+             (guix packages)
+             (guix gexp)
+             (guix licenses))
+
+(package
+ (name "pffi-guile")
+ (version "0.5.0")
+ (synopsis "Portable Foreign Function Interface for R7RS")
+ (description "Portable Foreign Function Interface for R7RS")
+ (license lgpl3+)
+ (home-page "https://sr.ht/~retropikzel/r7rs-pffi")
+ (source
+  (origin
+   (method git-fetch)
+   (uri (git-reference
+         (url "https://git.sr.ht/~retropikzel/r7rs-pffi/")
+         (commit "v0.5.0")))
+   (file-name (git-file-name "r7rs-pffi" version))
+   (sha256
+    (base32 "1ggkafggyqqla6ba8dlhzvvf6v7i6scpa2xyr1mfxxy8iwnl70aa"))))
+ (build-system copy-build-system)
+ (inputs (list guile-3.0))
+ (arguments
+  (let* ((base-dir "share/guile/site/3.0/retropikzel/")
+         (libdir (string-append base-dir "r7rs-pffi/")))
+    ;; Guile doesn't load sld files. It also won't load relative to the
+    ;; site directory.
+    `(#:phases
+      (modify-phases %standard-phases
+        (add-after 'unpack 'patch-paths
+          (lambda* (#:key outputs #:allow-other-keys)
+            (let* ((out (string-append (assoc-ref outputs "out")
+                                       "/"
+                                       ,libdir)))
+              (substitute* '("retropikzel/r7rs-pffi.sld")
+                (("\\(include \"r7rs-pffi")
+                 (string-append "(include \""
+                                out)))))))
+      #:install-plan
+      '(("retropikzel/r7rs-pffi.sld" ,(string-append
+                                       base-dir
+                                       "r7rs-pffi.scm"))
+        ("retropikzel/r7rs-pffi/guile.scm" ,libdir)
+        ("retropikzel/r7rs-pffi/main.scm" ,libdir)
+        ("retropikzel/r7rs-pffi/struct.scm" ,libdir))))))