graplang: init at 1.46

This is an implementation of Grap the language for describing graphs
as first implemented by Brian Kernighan and Jon Bentley at Bell Labs.

Co-authored-by: Anderson Torres <torres.anderson.85@protonmail.com>
Co-authored-by: Peder Bergebakken Sundt <pbsds@hotmail.com>

pkgs/by-name/gr/graplang/package.nix

@@ -0,0 +1,35 @@
+{ lib
+, stdenv
+, fetchurl
+, flex
+, bison
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "graplang";
+  version = "1.46";
+
+  outputs = [ "out" "man" ];
+
+  src = fetchurl {
+    url = "https://www.lunabase.org/~faber/Vault/software/grap/grap-${finalAttrs.version}.tar.gz";
+    hash = "sha512-7n+jLANU/x+wGrpjwYAnf45fQ5M91SwraiCbvUKe6XhWtilhGoT2yTlLkPlTihETTkizLyssW5gj5gbwNHaooA==";
+  };
+
+  nativeBuildInputs = [ flex bison ];
+
+  meta = with lib; {
+    description = "Language for typesetting graphs";
+    longDescription = ''
+      Grap is an Expressive language for describing graphs and incorporating
+      them in typeset documents.  It is implemented as a preprocessor to
+      Kernigan's pic language for describing languages, so any system that can
+      use pic can use grap. For sure, TeX and groff can use it.
+    '';
+    homepage = "https://www.lunabase.org/~faber/Vault/software/grap/";
+    changelog = "https://github.com/snorerot13/grap/blob/master/CHANGES";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ afh ];
+    mainProgram = "grap";
+  };
+})