Add day 1 part 1

2023/1-1.nix

@@ -0,0 +1,17 @@
+{ lib, input }:
+
+with lib; with builtins; let
+  lines = splitString "\n" input;
+
+  linesChars = map (splitString "") lines;
+
+  linesOnlyNumbers = map (filter (char: (match "[0-9]" char) != null)) linesChars;
+
+  firstAndLastConcatted = list: (head list) + (last list);
+
+  linesNumbers = map firstAndLastConcatted linesOnlyNumbers;
+
+  sumOfLinesNumbers = foldl' add 0 (map fromJSON linesNumbers);
+
+  result = sumOfLinesNumbers;
+in result

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1701253981,
+        "narHash": "sha256-ztaDIyZ7HrTAfEEUt9AtTDNoCYxUdSd6NrRHaYOIxtk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e92039b55bcd58469325ded85d4f58dd5a4eaf58",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,23 @@
+{
+  description = "RGBCube's Advent of Code Solutions.";
+
+  inputs = {
+    nixpkgs = {
+      url = "github:NixOS/nixpkgs/nixos-unstable";
+    };
+  };
+
+  outputs = { nixpkgs, ... }: let
+    lib = nixpkgs.lib;
+
+    pathToResult = path: import ./${path}.nix {
+      inherit lib;
+
+      input = builtins.concatStringsSep "\n"
+        (builtins.filter (line: line != "")
+          (lib.splitString "\n" (builtins.readFile ./${path}.in)));
+    };
+  in lib.genAttrs [
+    "2023/1-1"
+  ] pathToResult;
+}