1 files changed, 52 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..d53099c
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,52 @@
+# mostly lifted from https://github.com/xddxdd/nur-packages, converted into a standalone flake
+{
+  description = "GNU cobol compiler";
+
+  inputs = {
+    gnucobol-3_2-src = {
+      url = "https://ftp.gnu.org/gnu/gnucobol/gnucobol-3.2.tar.xz";
+      flake = false;
+    };
+    gnucobol-3_1_2-src = {
+      url = "https://ftp.gnu.org/gnu/gnucobol/gnucobol-3.1.2.tar.xz";
+      flake = false;
+    };
+  };
+
+  outputs =
+    { self
+    , nixpkgs
+    , gnucobol-3_2-src
+    , gnucobol-3_1_2-src
+    }:
+    let
+      supportedSystems = [ "x86_64-linux" ];
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+      nixpkgsFor = forAllSystems (system: import nixpkgs {
+        inherit system;
+        overlays = [ self.overlays.default ];
+      });
+    in
+    {
+      overlays.default = final: prev: {
+        gnucobol-3_1_2 =
+          final.gnu-cobol.overrideAttrs {
+            src = gnucobol-3_1_2-src;
+            doInstallCheck = false;
+          };
+
+        gnucobol-3_2 =
+          final.gnu-cobol.overrideAttrs {
+            src = gnucobol-3_2-src;
+            doInstallCheck = false;
+          };
+      };
+
+      packages = forAllSystems (system: {
+        inherit (nixpkgsFor."${system}") gnucobol-3_1_2 gnucobol-3_2;
+      });
+
+      defaultPackage = forAllSystems (system: self.packages."${system}".gnucobol-3_2);
+    };
+}
+