Set up IFC build tools

ifc/.envrc

@@ -1 +0,0 @@
-use_nix

ifc/.gitignore

@@ -1 +0,0 @@
-target

ifc/Makefile

@@ -0,0 +1,9 @@
+
+dev:
+	cargo watch -x build
+
+test:
+	cargo watch -x test
+
+test-once:
+	cargo test

ifc/shell.nix

@@ -1,20 +0,0 @@
-let
-    rust_overlay = import (builtins.fetchTarball "https://github.com/oxalica/rust-overlay/archive/master.tar.gz");
-    pkgs = import <pkgs-21.05> { overlays = [ rust_overlay ]; };
-    unstable = import <unstable> {};
-    rust = pkgs.rust-bin.stable."1.55.0".default.override {
-      extensions = [ "rust-src" ];
-    };
-
-in pkgs.mkShell {
-    name = "ifc";
-
-    buildInputs = [
-      rust
-      unstable.rust-analyzer
-    ];
-
-    shellHook = ''
-      if [ -e ~/.nixpkgs/shellhook.sh ]; then . ~/.nixpkgs/shellhook.sh; fi
-    '';
-}