nongnu: Add a new nongnu-patches syntax.

* nongnu/packages.scm: New file.

Signed-off-by: John Kehayias <john.kehayias@protonmail.com>

nongnu/packages.scm

@@ -0,0 +1,66 @@
+;;; SPDX-License-Identifier: GPL-3.0-or-later
+;;; Copyright © 2015, 2018 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2025 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+
+(define-module (nongnu packages)
+  #:use-module (gnu packages)
+  #:use-module (guix diagnostics)
+  #:use-module (guix i18n)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-34)
+  #:replace (%patch-path
+             search-patch)
+  #:export (nongnu-patches))
+
+;;; Commentary:
+;;;
+;;; This module refines the default value of some parameters from (gnu
+;;; packages) and the syntax/procedures using those.  This allows
+;;; 'search-paths' and friends to work without any user intervention.
+;;;
+;;; Code:
+
+(define %nongnu-root-directory
+  ;; This is like %distro-root-directory from (gnu packages), with adjusted
+  ;; paths.
+  (letrec-syntax ((dirname* (syntax-rules ()
+                              ((_ file)
+                               (dirname file))
+                              ((_ file head tail ...)
+                               (dirname (dirname* file tail ...)))))
+                  (try      (syntax-rules ()
+                              ((_ (file things ...) rest ...)
+                               (match (search-path %load-path file)
+                                 (#f
+                                  (try rest ...))
+                                 (absolute
+                                  (dirname* absolute things ...))))
+                              ((_)
+                               #f))))
+    (try ("nongnu/packages/firmware.scm" nongnu/ packages/)
+         ("nongnu/ci.scm" nongnu/))))
+
+(define %patch-path
+  ;; Define it after '%package-module-path' so that '%load-path' contains user
+  ;; directories, allowing patches in $GUIX_PACKAGE_PATH to be found.
+  (make-parameter
+   (map (lambda (directory)
+          (if (string=? directory %nongnu-root-directory)
+              (string-append directory "/nongnu/packages/patches")
+              directory))
+        %load-path)))
+
+;;; XXX: The following must be redefined to make use of the overridden
+;;; %patch-path parameter above.
+(define (search-patch file-name)
+  "Search the patch FILE-NAME.  Raise an error if not found."
+  (or (search-path (%patch-path) file-name)
+      (raise (formatted-message (G_ "~a: patch not found")
+                                file-name))))
+
+;;; XXX: `search-patches' being syntax, it can't be overridden by the module
+;;; system, or so it seems, so we simply rename it.
+(define-syntax-rule (nongnu-patches file-name ...)
+  "Return the list of absolute file names corresponding to each
+FILE-NAME found in %PATCH-PATH."
+  (list (search-patch file-name) ...))