chore: configure nix flake

.gitignore

@@ -2,6 +2,7 @@
 /Superfile.hcl
 /Superfile.toml
 /.flox
+/result
 
 
 # Created by https://www.toptal.com/developers/gitignore/api/node,macos

flake/flake.nix

@@ -0,0 +1,160 @@
+{
+  description = "Superviseur - Define and run multi-service applications on isolated environments with Nix or Docker ❄️🐋 🛠️ 💻 ✨";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+
+    crane = {
+      url = "github:ipetkov/crane";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.rust-analyzer-src.follows = "";
+    };
+
+    flake-utils.url = "github:numtide/flake-utils";
+
+    advisory-db = {
+      url = "github:rustsec/advisory-db";
+      flake = false;
+    };
+  };
+
+  outputs = { self, nixpkgs, crane, fenix, flake-utils, advisory-db, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+
+        inherit (pkgs) lib;
+
+        craneLib = crane.lib.${system};
+
+        protoFilter = path: _type: builtins.match ".*proto$" path != null;
+        protoOrCargo = path: type:
+          (protoFilter path type) || (craneLib.filterCargoSources path type);
+
+        # src = craneLib.cleanCargoSource (craneLib.path ../.);
+        src = lib.cleanSourceWith {
+          src = craneLib.path ../.; # The original, unfiltered source
+          filter = protoOrCargo;
+        };
+
+        # Common arguments can be set here to avoid repeating them later
+        commonArgs = {
+          inherit src;
+
+          pname = "superviseur";
+          version = "0.1.0-alpha.13";
+          cargoExtraArgs = "--package=superviseur";
+
+
+
+          buildInputs = [
+            # Add additional build inputs here
+            pkgs.pkgconfig
+            pkgs.gnumake
+            pkgs.protobuf
+          ] ++ lib.optionals pkgs.stdenv.isDarwin [
+            # Additional darwin specific inputs can be set here
+            pkgs.libiconv
+            pkgs.darwin.Security
+          ];
+
+          # Additional environment variables can be set directly
+          # MY_CUSTOM_VAR = "some value";
+        };
+
+        craneLibLLvmTools = craneLib.overrideToolchain
+          (fenix.packages.${system}.complete.withComponents [
+            "cargo"
+            "llvm-tools"
+            "rustc"
+          ]);
+
+        # Build *just* the cargo dependencies, so we can reuse
+        # all of that work (e.g. via cachix) when running in CI
+        cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+
+        # Build the actual crate itself, reusing the dependency
+        # artifacts from above.
+        superviseur = craneLib.buildPackage (commonArgs // {
+          inherit cargoArtifacts;
+        });
+
+      in
+      {
+        checks = {
+          # Build the crate as part of `nix flake check` for convenience
+          inherit superviseur;
+
+          # Run clippy (and deny all warnings) on the crate source,
+          # again, resuing the dependency artifacts from above.
+          #
+          # Note that this is done as a separate derivation so that
+          # we can block the CI if there are issues here, but not
+          # prevent downstream consumers from building our crate by itself.
+          superviseur-clippy = craneLib.cargoClippy (commonArgs // {
+            inherit cargoArtifacts;
+            cargoClippyExtraArgs = "--all-targets -- --deny warnings";
+          });
+
+          superviseur-doc = craneLib.cargoDoc (commonArgs // {
+            inherit cargoArtifacts;
+          });
+
+          # Check formatting
+          superviseur-fmt = craneLib.cargoFmt {
+            inherit src;
+          };
+
+          # Audit dependencies
+          superviseur-audit = craneLib.cargoAudit {
+            inherit src advisory-db;
+          };
+
+          # Run tests with cargo-nextest
+          # Consider setting `doCheck = false` on `superviseur` if you do not want
+          # the tests to run twice
+          superviseur-nextest = craneLib.cargoNextest (commonArgs // {
+            inherit cargoArtifacts;
+            partitions = 1;
+            partitionType = "count";
+          });
+        } // lib.optionalAttrs (system == "x86_64-linux") {
+          # NB: cargo-tarpaulin only supports x86_64 systems
+          # Check code coverage (note: this will not upload coverage anywhere)
+          superviseur-coverage = craneLib.cargoTarpaulin (commonArgs // {
+            inherit cargoArtifacts;
+          });
+        };
+
+        packages = {
+          default = superviseur;
+          superviseur-llvm-coverage = craneLibLLvmTools.cargoLlvmCov (commonArgs // {
+            inherit cargoArtifacts;
+          });
+        };
+
+        apps.default = flake-utils.lib.mkApp {
+          drv = superviseur;
+        };
+
+        devShells.default = pkgs.mkShell {
+          inputsFrom = builtins.attrValues self.checks.${system};
+
+          # Additional dev-shell environment variables can be set directly
+          # MY_CUSTOM_DEVELOPMENT_VAR = "something else";
+
+          # Extra inputs can be added here
+          nativeBuildInputs = with pkgs; [
+            cargo
+            rustc
+          ];
+        };
+      });
+}