diff --git a/pkgs/default.nix b/pkgs/default.nix
index 1c52a63..e1fa46c 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -52,6 +52,7 @@ in {
     };
   };
   writeFennelScript = callPackage ./write-fennel-script {};
+  writeFennel = callPackage ./write-fennel {};
   writeAshScript = callPackage ./write-ash-script {};
   systemconfig = callPackage ./systemconfig {};
   s6-init-bin =  callPackage ./s6-init-bin {};
diff --git a/pkgs/write-fennel-script/default.nix b/pkgs/write-fennel-script/default.nix
index dfe36f4..09e46c4 100644
--- a/pkgs/write-fennel-script/default.nix
+++ b/pkgs/write-fennel-script/default.nix
@@ -2,30 +2,8 @@
   lua
 , lib
 , fennel
+, writeFennel
 , stdenv
 }:
 name : packages : source :
-  let
-    luapath = builtins.map
-      (f:
-        "${f}/share/lua/${lua.luaversion}/?.lua;" +
-        "${f}/share/lua/${lua.luaversion}/?/init.lua;")
-      packages;
-    luacpath = builtins.map (f: "${f}/lib/lua/${lua.luaversion}/?.so;") packages;
-  in stdenv.mkDerivation {
-    inherit name;
-    src = ./.;
-    nativeBuildInputs = [ fennel ];
-    buildPhase = ''
-      (
-       echo "#!${lua}/bin/lua"
-       echo "package.path = ${lib.strings.escapeShellArg (builtins.concatStringsSep "" luapath)} .. package.path"
-       echo "package.cpath = ${lib.strings.escapeShellArg (builtins.concatStringsSep "" luacpath)} .. package.cpath"
-       fennel --correlate --compile ${source}
-      ) >  ${name}.lua
-    '';
-    installPhase = ''
-      cp ${name}.lua $out
-      chmod +x $out
-    '';
-  }
+writeFennel name { inherit packages; } source
diff --git a/pkgs/write-fennel/default.nix b/pkgs/write-fennel/default.nix
new file mode 100644
index 0000000..c9be23e
--- /dev/null
+++ b/pkgs/write-fennel/default.nix
@@ -0,0 +1,37 @@
+{
+  lua
+, lib
+, fennel
+, stdenv
+}:
+name :
+{
+  packages ? [],
+  correlate ? false,
+  mainFunction ? null
+} @ options : source :
+  let
+    luapath = builtins.map
+      (f:
+        "${f}/share/lua/${lua.luaversion}/?.lua;" +
+        "${f}/share/lua/${lua.luaversion}/?/init.lua;")
+      packages;
+    luacpath = builtins.map (f: "${f}/lib/lua/${lua.luaversion}/?.so;") packages;
+    luaFlags = lib.optionalString (mainFunction !=null) "-e dofile(arg[0]).${mainFunction}()";
+  in stdenv.mkDerivation {
+    inherit name;
+    src = ./.;
+    nativeBuildInputs = [ fennel ];
+    buildPhase = ''
+      (
+       echo "#!${lua}/bin/lua ${luaFlags}"
+       echo "package.path = ${lib.strings.escapeShellArg (builtins.concatStringsSep "" luapath)} .. package.path"
+       echo "package.cpath = ${lib.strings.escapeShellArg (builtins.concatStringsSep "" luacpath)} .. package.cpath"
+       fennel ${if correlate then "--correlate" else ""} --compile ${source}
+      ) >  ${name}.lua
+    '';
+    installPhase = ''
+      cp ${name}.lua $out
+      chmod +x $out
+    '';
+  }