initial commit: set up a template

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

flake.nix

@@ -0,0 +1,55 @@
+{
+  description = "matar";
+  inputs = {
+    nixpkgs.url = github:nixos/nixpkgs/nixpkgs-unstable;
+  };
+  outputs = { self, nixpkgs }:
+    let
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "i686-linux"
+      ];
+      eachSystem = with nixpkgs.lib; f: foldAttrs mergeAttrs { }
+        (map (s: mapAttrs (_: v: { ${s} = v; }) (f s)) systems);
+    in
+    eachSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        llvm = pkgs.llvmPackages;
+        stdenv = llvm.libcxxStdenv;
+
+        nativeBuildInputs = with pkgs; [ meson ninja ];
+      in
+      {
+        packages = rec {
+          matar = stdenv.mkDerivation rec {
+            name = "matar";
+            src = pkgs.lib.sourceFilesBySuffices ./. [
+              ".hh"
+              ".cc"
+              ".build"
+            ];
+            outputs = [ "dev" "out" ];
+
+            inherit nativeBuildInputs;
+
+            enableParallelBuilding = true;
+          };
+          default = matar;
+        };
+
+        devShells = rec {
+          matar = pkgs.mkShell.override { inherit stdenv; } {
+            name = "matar";
+            packages = nativeBuildInputs ++ (with pkgs; [
+              bear
+              clang-tools
+            ]);
+          };
+          default = matar;
+        };
+
+        formatter = pkgs.nixpkgs-fmt;
+      });
+}