gnu: Add zls.

* gnu/packages/zig-xyz.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

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

gnu/local.mk

@@ -643,6 +643,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/xorg.scm				\
   %D%/packages/xfce.scm				\
   %D%/packages/zig.scm				\
+  %D%/packages/zig-xyz.scm			\
   %D%/packages/zile.scm				\
   %D%/packages/zwave.scm			\
 						\

gnu/packages/zig-xyz.scm

@@ -0,0 +1,65 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2022 Maya Tomasek <maya.tomasek@disroot.org>
+;;;
+;;; 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 zig-xyz)
+  #:use-module (guix packages)
+  #:use-module (guix git-download)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix gexp)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages zig)
+  #:use-module (gnu packages python))
+
+(define-public zig-zls
+  (package
+    (name "zig-zls")
+    (version "0.9.0")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/zigtools/zls")
+                    (commit version)
+                    (recursive? #t)))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "1hhs7dz9rpshfd1a7x5swmix2rmh53vsqskh3mzqlrj2lgb3cnii"))))
+    (build-system gnu-build-system)
+    (inputs (list zig python))
+    (arguments
+     (list #:phases #~(modify-phases %standard-phases
+                        (delete 'configure)
+                        (replace 'build
+                          (lambda* (#:key outputs #:allow-other-keys)
+                            (let ((out (assoc-ref outputs "out")))
+                              (setenv "ZIG_GLOBAL_CACHE_DIR"
+                                      (string-append (getcwd) "/zig-cache"))
+                              (invoke "zig" "build" "install"
+                                      "-Drelease-safe" "--prefix" out))))
+                        (delete 'install)
+                        (replace 'check
+                          (lambda* (#:key tests? #:allow-other-keys)
+                            (when tests?
+                              (invoke "zig" "build" "test")))))))
+    (synopsis "Zig language server")
+    (description
+     "Zig Language Server is a language server implementing the @acronym{LSP,
+Language Server Protocol} for the Zig programming language.")
+    (home-page "https://github.com/zigtools/zls")
+    (license license:expat)))