From 0122c877ac46038f2b5ec441f7039bb2010f17ee Mon Sep 17 00:00:00 2001
From: Kiana Sheibani <kiana.a.sheibani@gmail.com>
Date: Thu, 4 Sep 2025 21:05:45 -0400
Subject: [PATCH] feat(assign1): add basic "Hello World" program

---
 .gitignore                 |  1 +
 assign1/c-programs/hello.c |  8 ++++++++
 assign1/default.nix        | 12 ++++++++++++
 flake.nix                  | 14 ++++++++++++--
 4 files changed, 33 insertions(+), 2 deletions(-)
 create mode 100644 assign1/c-programs/hello.c
 create mode 100644 assign1/default.nix

diff --git a/.gitignore b/.gitignore
index 2cafb9a..3d8789c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,3 +56,4 @@ dkms.conf
 
 # Nix related things
 .direnv/
+result*/
diff --git a/assign1/c-programs/hello.c b/assign1/c-programs/hello.c
new file mode 100644
index 0000000..a936748
--- /dev/null
+++ b/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;
+}
diff --git a/assign1/default.nix b/assign1/default.nix
new file mode 100644
index 0000000..e9e368b
--- /dev/null
+++ b/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
+      '';
+    };
+}
diff --git a/flake.nix b/flake.nix
index bccf8ee..902c9c6 100644
--- a/flake.nix
+++ b/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};