flake: codium first commit

flake.nix

@@ -0,0 +1,71 @@
+{
+  description = "A Flake for building coq and providing devShells for the coq-tinyram project";
+
+  inputs = {
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+
+  outputs =
+    { self
+    , nixpkgs
+    , flake-compat
+    }:
+    let
+      # Generate a user-friendly version number.
+      version = builtins.substring 0 8 self.lastModifiedDate;
+      # System types to support.
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" ];
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system:
+        import nixpkgs {
+          inherit system;
+          overlays = [ self.overlay ];
+        });
+    in
+    {
+      overlay = final: prev: { };
+      # the default devShell used when running `nix develop`
+      devShell = forAllSystems (system: self.devShells.${system}.defaultShell);
+      devShells = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor."${system}";
+        in
+        {
+          # In case we don't want to provide an editor, this defaultShell will
+          # provide only coq packages we need.
+          defaultShell = pkgs.mkShell {
+            buildInputs = with pkgs; [
+              yarn
+            ];
+          };
+          # This is the defaultShell, but overriden to add one additional buildInput,
+          # vscodium!
+          vscodium = self.devShells.${system}.defaultShell.overrideAttrs (old: {
+            buildInputs =
+              let
+                vscodeWithRescript = pkgs.vscode-with-extensions.override {
+                  vscode = pkgs.vscodium;
+                  vscodeExtensions = pkgs.vscode-utils.extensionsFromVscodeMarketplace [
+                    {
+                      name = "rescript-vscode";
+                      publisher = "rescript-lang";
+                      version = "1.2.1";
+                      sha256 = "sha256-b0gCaEzt5yAj53oLFZSXSD3bum9J1fYes/uf9+OlUek=";
+                    }
+                  ];
+                };
+              in
+              old.buildInputs
+              ++ [
+                vscodeWithRescript
+              ];
+          });
+        });
+    };
+}