guix: use local-file

manifest.scm

 (define-module (guix walint)
   #:use-module (guix download)
+  #:use-module (guix gexp)
   #:use-module (guix profiles)
   #:use-module (gnu packages haskell)
   #:use-module (gnu packages haskell-web)
@@ -10,6 +11,8 @@
   #:use-module (guix licenses)
   #:use-module (srfi srfi-1))
 
+;; the regex packages provided by current guix are a little too old,
+;; and would result in a missing typeclass instance
 (define ghc-regex-base-newer
   (package
     (inherit ghc-regex-base)
@@ -25,8 +28,6 @@
         (base32
          "1ngdmmrxs1rhvib052c6shfa40yad82jylylikz327r0zxpxkcbi"))))))
 
-
-
 (define ghc-regex-tdfa-newer
   (package
     (inherit ghc-regex-tdfa)
@@ -48,13 +49,7 @@
     (name "walint")
     (version "0.1")
     (source
-     (origin
-       (method git-fetch)
-       (uri (git-reference
-             (url "https://stuebinm.eu/git/walint")
-             (commit "c93c266951ea40938efcb061b438ce95e9780fde")))
-       (sha256
-        (base32 "144ysxjg5qj7wirbs3pvwszarz156ba78mk873lrd6w4qxnq9kqy"))))
+      (local-file "" #:recursive? #t))
     (build-system haskell-build-system)
     (arguments '())
     (inputs
@@ -65,8 +60,7 @@
        ("ghc-aeson-pretty" ,ghc-aeson-pretty)
        ("ghc-either" ,ghc-either)
        ("ghc-extra" ,ghc-extra)
-       ("ghc-bytestring-builder" ,ghc-bytestring-builder)
-       ))
+       ("ghc-bytestring-builder" ,ghc-bytestring-builder)))
     (home-page "https://stuebinm.eu/git/walint")
     (synopsis "linter for workadventure maps")
     (description