gnu: Add Lokke.

* gnu/packages/guile.scm (guile-3.0-for-lokke): New variable.
* gnu/packages/guile-xyz.scm (lokke): New variable.
* gnu/packages/patches/guile-3.0.7-psyntax-nil.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -1228,6 +1228,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/guile-3.0-relocatable.patch		\
   %D%/packages/patches/guile-linux-syscalls.patch		\
   %D%/packages/patches/guile-3.0-linux-syscalls.patch		\
+  %D%/packages/patches/guile-3.0.7-psyntax-nil.patch		\
   %D%/packages/patches/guile-fibers-destroy-peer-schedulers.patch \
   %D%/packages/patches/guile-gdbm-ffi-support-gdbm-1.14.patch	\
   %D%/packages/patches/guile-git-adjust-for-libgit2-1.2.0.patch \

gnu/packages/guile-xyz.scm

@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2012-2022 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014, 2015, 2018 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2015, 2017 Christine Lemmer-Webber <cwebber@dustycloud.org>
 ;;; Copyright © 2016 Alex Sassmannshausen <alex@pompo.co>
@@ -97,6 +97,7 @@ (define-module (gnu packages guile-xyz)
   #:use-module (gnu packages nss)
   #:use-module (gnu packages package-management)
   #:use-module (gnu packages password-utils)
+  #:use-module (gnu packages pcre)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages python)
@@ -4924,3 +4925,48 @@ (define-public guile-kolam
 create GraphQL schemas, an execution engine to execute GraphQL queries, and a
 HTTP handler to implement a HTTP GraphQL endpoint.")
     (license license:agpl3+)))
+
+(define-public lokke
+  (let ((commit "92d36370dc6d218ff3bf315e56ebef93808c1b79")
+        (revision "1"))
+    (package
+      (name "lokke")
+      (version (git-version "0.0.0" revision commit))
+      (home-page "https://github.com/lokke-org/lokke")
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference (url home-page) (commit commit)))
+                (file-name (git-file-name name version))
+                (sha256
+                 (base32
+                  "1c913md4dcfb0x4n26wbx9wdw453wxg3c5rn49k3f6j8zjqv63yv"))))
+      (build-system gnu-build-system)
+      (arguments
+       '(#:phases
+         (modify-phases %standard-phases
+           (add-before 'bootstrap 'pre-bootstrap
+             (lambda _
+               (for-each patch-shebang
+                         '("setup" "gen-makefile"
+                           "dev/gen-module-paths"
+                           "dev/refresh"))
+               (invoke "./setup")))
+           (add-before 'build 'set-home
+             (lambda _
+               (setenv "HOME" (getcwd)))))))
+      (native-inputs
+       (list autoconf
+             automake
+             libtool
+             gnu-gettext
+             pkg-config
+             guile-3.0-for-lokke))
+      (inputs
+       (list pcre2))
+      (synopsis "Clojure implementation in Guile")
+      (description
+       "Lokke intends to provide a full dialect of Clojure for Guile.  It also
+consists of a set of Guile modules providing some of Clojure's functionality
+in two different guises.")
+      ;; Dual license: LGPLv2.1+ or EPLv1.0+ at the user's option.
+      (license (list license:lgpl2.1+ license:epl1.0)))))

gnu/packages/guile.scm

@@ -391,6 +391,17 @@ (define-public guile-3.0
 (define-public guile-3.0-latest
   guile-3.0)
 
+(define-public guile-3.0-for-lokke
+  ;; Work around a bug in 3.0.7 regarding #nil handling by psyntax:
+  ;; <https://bugs.gnu.org/49305>.  TODO: Replace by 3.0.8 when it's out.
+  (hidden-package
+   (package/inherit guile-3.0
+     (version (string-append (package-version guile-3.0) ".1"))
+     (source (origin
+               (inherit (package-source guile-3.0))
+               (patches (cons (search-patch "guile-3.0.7-psyntax-nil.patch")
+                              (origin-patches (package-source guile-3.0)))))))))
+
 (define-public guile-3.0/libgc-7
   ;; Using libgc-7 avoid crashes that can occur, particularly when loading
   ;; data in to the Guix Data Service:

gnu/packages/patches/guile-3.0.7-psyntax-nil.patch

@@ -0,0 +1,63 @@
+commit d79a226359d28f4a1dc5df136e5544d699903a96
+Author: Rob Browning <rlb@defaultvalue.org>
+Date:   Sat Jul 3 14:01:12 2021 -0500
+
+    Fix crash on #nil in syntaxes
+    
+    In 3.0.7 (after 0cc799185576712d69f11fc794454f2f5447bef7 "Ensure
+    that (syntax ()) results in ("), the use of #nil in syntax-rules
+    expansions like this:
+    
+      (define-syntax foo
+        (syntax-rules ()
+          ((_ x) (eq? #nil x))))
+    
+      (foo #t)
+    
+    could cause a crash that looks like this:
+    
+      ice-9/psyntax.scm:2795:12: In procedure syntax-violation:
+      Syntax error:
+      unknown location: unexpected syntax in form ()
+    
+    To fix it, add another special case (the commit mentioned above
+    special-cased the empty list) to preserve #nil
+    
+    * module/ice-9/psyntax.scm (gen-syntax): Preserve #nil.
+    * test-suite/tests/syntax.test: Test #nil in syntax expansions.
+    
+    Closes: 49305
+
+diff --git a/module/ice-9/psyntax.scm b/module/ice-9/psyntax.scm
+index 663d9275a..bd4bd6723 100644
+--- a/module/ice-9/psyntax.scm
++++ b/module/ice-9/psyntax.scm
+@@ -2157,6 +2157,7 @@
+                       (lambda ()
+                         (gen-syntax src #'(e1 e2 ...) r maps ellipsis? mod))
+                     (lambda (e maps) (values (gen-vector e) maps))))
++                 (x (eq? (syntax->datum #'x) #nil) (values '(quote #nil) maps))
+                  (() (values '(quote ()) maps))
+                  (_ (values `(quote ,e) maps))))))
+ 
+diff --git a/test-suite/tests/syntax.test b/test-suite/tests/syntax.test
+index a2999ac43..510e7104d 100644
+--- a/test-suite/tests/syntax.test
++++ b/test-suite/tests/syntax.test
+@@ -1684,6 +1684,16 @@
+         (hash interpreted most-positive-fixnum)
+       (hash compiled most-positive-fixnum))))
+ 
++(with-test-prefix "#nil in syntaxes"
++  (pass-if-equal "does not crash"
++      42
++    (let ()
++      (define-syntax foo
++        (syntax-rules ()
++          ;; In 3.0.7 this would crash with
++          ;;   unknown location: unexpected syntax in form ()
++          ((_ x) (when (eq? x #nil) 42))))
++      (foo #nil))))
+ 
+ ;;; Local Variables:
+ ;;; eval: (put 'pass-if-syntax-error 'scheme-indent-function 1)