build-system: Add zig-build-system.

* guix/build-system/zig.scm: New file.
* guix/build/zig-build-system.scm: New file.
* Makefile.am: Add them.
* doc/guix.texi: Document it.
* etc/snippets/yas/scheme-mode/guix-package (build-system): Add
  zig-build-system.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 124 insertions, 0 deletions

diff --git a/guix/build-system/zig.scm b/guix/build-system/zig.scm
new file mode 100644
index 0000000000..16b8a712cc
--- /dev/null
+++ b/guix/build-system/zig.scm
@@ -0,0 +1,124 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2023 Ekaitz Zarraga <ekaitz@elenq.tech>
+;;;
+;;; 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 zig)
+  #:use-module (guix search-paths)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix gexp)
+  #:use-module (guix monads)
+  #:use-module (guix packages)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-26)
+  #:export (zig-build-system))
+
+
+(define (default-zig)
+  "Return the default zig package."
+  ;; Lazily resolve the binding to avoid a circular dependency.
+  (let ((zig (resolve-interface '(gnu packages zig))))
+    (module-ref zig 'zig)))
+
+(define %zig-build-system-modules
+  ;; Build-side modules imported by default.
+  `((guix build zig-build-system)
+    (guix build syscalls)
+    ,@%gnu-build-system-modules))
+
+(define* (zig-build name inputs
+                    #:key
+                    source
+                    (tests? #t)
+                    (test-target #f)
+                    (zig-build-flags ''())
+                    (zig-test-flags ''())
+                    (zig-release-type #f)
+                    (phases '%standard-phases)
+                    (outputs '("out"))
+                    (search-paths '())
+                    (system (%current-system))
+                    (guile #f)
+                    (imported-modules %zig-build-system-modules)
+                    (modules '((guix build zig-build-system)
+                               (guix build utils))))
+  "Build SOURCE using Zig, and with INPUTS."
+  (define builder
+    (with-imported-modules imported-modules
+      #~(begin
+          (use-modules #$@(sexp->gexp modules))
+          (zig-build #:name #$name
+                     #:source #+source
+                     #:system #$system
+                     #:test-target #$test-target
+                     #:zig-build-flags #$zig-build-flags
+                     #:zig-test-flags #$zig-test-flags
+                     #:zig-release-type #$zig-release-type
+                     #:tests? #$tests?
+                     #:phases #$phases
+                     #:outputs #$(outputs->gexp outputs)
+                     #:search-paths '#$(sexp->gexp
+                                        (map search-path-specification->sexp
+                                             search-paths))
+                     #:inputs #$(input-tuples->gexp inputs)))))
+
+  (mlet %store-monad ((guile (package->derivation (or guile (default-guile))
+                                                  system #:graft? #f)))
+    (gexp->derivation name builder
+                      #:system system
+                      #:guile-for-build guile)))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                (zig (default-zig))
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME."
+
+  (define private-keywords
+    '(#:target #:zig #:inputs #:native-inputs #:outputs))
+
+  ;; TODO: support cross-compilation
+  ;; It's as simple as adding some build flags to `zig-build-flags`
+  ;; -Dtarget=aarch64-linux-musl, for example.
+  (and (not target)
+       (bag
+         (name name)
+         (system system)
+         (target target)
+         (host-inputs `(,@(if source
+                              `(("source" ,source))
+                              '())
+                        ,@inputs
+
+                        ;; Keep the standard inputs of 'gnu-build-system'
+                        ;; TODO: do we need this?
+                        ,@(standard-packages)))
+         (build-inputs `(("zig" ,zig)
+                         ,@native-inputs))
+         (outputs outputs)
+         (build zig-build)
+         (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define zig-build-system
+  (build-system
+    (name 'zig)
+    (description
+     "Zig build system, to build Zig packages")
+    (lower lower)))