feat(assign1): add basic "Hello World" program

.gitignore

@@ -56,3 +56,4 @@ dkms.conf
 
 # Nix related things
 .direnv/
+result*/

assign1/c-programs/hello.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+  printf("Welcome to OwlTech Industries!\n");
+  printf("Systems Programming Division\n");
+
+  return 0;
+}

assign1/default.nix

@@ -0,0 +1,12 @@
+{
+  assign1-hello = { stdenv }:
+    stdenv.mkDerivation {
+      name = "hello";
+      src = ./.;
+      buildPhase = "gcc c-programs/hello.c -o hello";
+      installPhase = ''
+        mkdir -p $out/bin
+        install hello $out/bin/hello
+      '';
+    };
+}

flake.nix

@@ -7,11 +7,21 @@
   };
 
   outputs = { self, nixpkgs, systems, ... }:
-    let eachSystem = nixpkgs.lib.genAttrs (import systems);
+    let
+      subdirs = [
+        "assign1"
+      ];
+
+      eachSystem = nixpkgs.lib.genAttrs (import systems);
     in {
       packages = eachSystem (system:
         let pkgs = nixpkgs.legacyPackages.${system};
-        in {});
+        in pkgs.lib.mergeAttrsList
+          (builtins.map (d:
+            builtins.mapAttrs
+              (_: v: pkgs.callPackage v {})
+              (import ./${d}))
+            subdirs));
 
       devShells = eachSystem (system:
         let pkgs = nixpkgs.legacyPackages.${system};