Initial commit

.envrc

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+use flake

.gitignore

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+# Zig
+zig-*
+.zig-*
+
+# Nix
+result*
+
+# Misc
+.direnv

build.zig

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+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    // TODO: This should be a non-exhaustive enum with one option: all
+    const day = b.option(u8, "day", "Build day") orelse 1;
+
+    // TODO: Depending on the day chosen, only that day should compile, or all days
+    const exe = addDay(b, target, optimize, day);
+    b.installArtifact(exe);
+
+    // run step
+    const run_exe = b.addRunArtifact(exe);
+    const run_step = b.step("run", "Run the binary");
+    run_step.dependOn(&run_exe.step);
+}
+
+fn addDay(
+    b: *std.Build,
+    target: std.Build.ResolvedTarget,
+    optimize: std.builtin.OptimizeMode,
+    day: u8,
+) *std.Build.Step.Compile {
+    return b.addExecutable(.{
+        .name = "aoc2025",
+        .root_module = b.createModule(.{
+            .root_source_file = b.path(b.fmt("src/day_{d}.zig", .{day})),
+            .target = target,
+            .optimize = optimize,
+        }),
+    });
+}
+

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1763283776,
+        "narHash": "sha256-Y7TDFPK4GlqrKrivOcsHG8xSGqQx3A6c+i7novT85Uk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "50a96edd8d0db6cc8db57dab6bb6d6ee1f3dc49a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Zig Template";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        pkgs = nixpkgs.legacyPackages.${system};
+        nativeBuildInputs = with pkgs; [
+          zig
+          zls
+        ];
+
+        buildInputs = with pkgs; [];
+      in {
+        devShells.default = pkgs.mkShell {inherit nativeBuildInputs buildInputs;};
+
+        packages.default = pkgs.stdenv.mkDerivation {
+          pname = "template";
+          version = "0.0.0";
+          src = ./.;
+
+          nativeBuildInputs =
+            nativeBuildInputs
+            ++ [
+              pkgs.zig.hook
+            ];
+          inherit buildInputs;
+        };
+      }
+    );
+}

src/day_1.zig

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+const std = @import("std");
+
+pub fn main() !void {
+}
+