ragel: add stable version, default to stable

pkgs/development/tools/parsing/ragel/default.nix

@@ -1,13 +1,15 @@
-{stdenv, fetchurl, transfig, tex , ghostscript, colm,  build-manual ? false
+{ stdenv, fetchurl, transfig, tex, ghostscript, colm
+, build-manual ? false
 }:
 
-stdenv.mkDerivation rec {
+let
+  generic = { version, sha256 }:
+    stdenv.mkDerivation rec {
       name = "ragel-${version}";
-  version = "7.0.0.9";
 
       src = fetchurl {
         url = "http://www.colm.net/files/ragel/${name}.tar.gz";
-    sha256 = "1w2jhfg3fxl15gcmm7z3jbi6splgc83mmwcfbp08lfc8sg2wmrmr";
+        inherit sha256;
       };
 
       buildInputs = stdenv.lib.optional build-manual [ transfig ghostscript tex ];
@@ -27,4 +29,18 @@ stdenv.mkDerivation rec {
         platforms = platforms.unix;
         maintainers = with maintainers; [ pSub ];
       };
+    };
+
+in
+
+{
+  ragelStable = generic {
+    version = "6.9";
+    sha256 = "02k6rwh8cr95f1p5sjjr3wa6dilg06572xz1v71dk8awmc7vw1vf";
+  };
+
+  ragelDev = generic {
+    version = "7.0.0.9";
+    sha256 = "1w2jhfg3fxl15gcmm7z3jbi6splgc83mmwcfbp08lfc8sg2wmrmr";
+  };
 }

pkgs/top-level/all-packages.nix

@@ -6438,10 +6438,11 @@ in
     luaBindings = config.radare.luaBindings or false;
   };
 
+  ragel = ragelStable;
 
-  ragel = callPackage ../development/tools/parsing/ragel {
+  inherit (callPackages ../development/tools/parsing/ragel {
       tex = texlive.combined.scheme-small;
-  };
+    }) ragelStable ragelDev;
 
   hammer = callPackage ../development/tools/parsing/hammer { };