gnu: Add ocamlformat.

* gnu/packages/ocaml.scm (ocamlformat): New variable.

Signed-off-by: Julien Lepiller <julien@lepiller.eu>

gnu/packages/ocaml.scm

@@ -7104,6 +7104,50 @@ (define-public ocaml-dune-build-info
 reporting the version from the version control system during development to
 get an precise reference of when the executable was built.")))
 
+(define-public ocamlformat
+  (package
+    (name "ocamlformat")
+    (version "0.18.0")
+    (source
+      (origin
+        (method git-fetch)
+        (uri (git-reference
+              (url "https://github.com/ocaml-ppx/ocamlformat")
+              (commit version)))
+        (file-name (git-file-name name version))
+        (sha256
+          (base32
+            "0n6363km8xr81pvyk453n6h2mb0256c5yxw3p1li4dn83f3lwxr1"))))
+    (build-system dune-build-system)
+    (arguments
+     '(#:package "ocamlformat"
+       ;; FIXME: The expected format is slightly different than what the
+       ;; produced format is for test/cli/stdin.t
+       #:tests? #f))
+    (propagated-inputs
+      `(("ocaml-version" ,ocaml-version)
+        ("ocaml-base" ,ocaml-base)
+        ("ocaml-cmdliner" ,ocaml-cmdliner)
+        ("ocaml-dune-build-info" ,ocaml-dune-build-info)
+        ("ocaml-fix" ,ocaml-fix)
+        ("ocaml-fpath" ,ocaml-fpath)
+        ("ocaml-menhir" ,ocaml-menhir)
+        ("ocaml-odoc" ,ocaml-odoc)
+        ("ocaml-ppxlib" ,ocaml-ppxlib)
+        ("ocaml-re" ,ocaml-re)
+        ("ocaml-stdio" ,ocaml-stdio)
+        ("ocaml-uuseg" ,ocaml-uuseg)
+        ("ocaml-uutf" ,ocaml-uutf)))
+    (native-inputs
+      `(("ocaml-alcotest" ,ocaml-alcotest)
+        ("ocaml-ocp-indent" ,ocaml-ocp-indent)
+        ("ocaml-bisect-ppx" ,ocaml-bisect-ppx)))
+    (home-page "https://github.com/ocaml-ppx/ocamlformat")
+    (synopsis "Auto-formatter for OCaml code")
+    (description "OCamlFormat is a tool to automatically format OCaml code in
+a uniform style.")
+    (license license:expat)))
+
 (define-public ocaml-bigstringaf
   (package
     (name "ocaml-bigstringaf")