nix flake support

Author: fidgetingbits

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1,3 +1,5 @@
+/.direnv/
+/.emscripten_cache/
 /.make-work/
 /.metals/
 /.vscode-test/

flake.lock

@@ -0,0 +1,35 @@
+{
+  description = "A Nix-flake-based development environment for vscode-parse-tree";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = { self, nixpkgs }:
+    let
+      overlays = [
+        (final: prev: rec {
+          nodejs = prev.nodejs-18_x;
+          yarn = (prev.yarn.override { inherit nodejs; });
+        })
+      ];
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit overlays system; config.allowUnfree = true; };
+      });
+    in
+    {
+      devShells = forEachSupportedSystem
+        ({ pkgs }: {
+          default = pkgs.mkShell
+            {
+              packages = with pkgs; [ nodejs yarn emscripten python310 steam-run vsce ];
+              shellHook = ''
+                if [ ! -d $(pwd)/.emscripten_cache ]; then
+                  cp -R ${pkgs.emscripten}/share/emscripten/cache/ $(pwd)/.emscripten_cache
+                  chmod u+rwX -R $(pwd)/.emscripten_cache
+                  export EM_CACHE=$(pwd)/.emscripten_cache
+                fi
+              '';
+            };
+        });
+    };
+}