feat: basic cmake hello world with clangd tooling

.envrc

@@ -0,0 +1,9 @@
+use flake .nix
+dotenv_if_exists
+
+if on_git_branch; then
+    echo 
+    git status --short --branch 
+    echo 
+    git fetch
+fi

.gitignore

@@ -0,0 +1,2 @@
+/build
+/.cache

.nix/flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1694562957,
+        "narHash": "sha256-ZvDt5bxX6Ga+TQ6kvK5WEn7OQN87KAsMaRrFSdReIm8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f4a33546bdb5f81bd6cceb1b3cb19667145fed83",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-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
+}

.nix/flake.nix

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+{
+  description = "A basic flake with a shell";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShell = pkgs.mkShell {
+          nativeBuildInputs = [ pkgs.bashInteractive ];
+          buildInputs = with pkgs; [
+            # building
+            gcc
+            clang
+            cmake
+
+            # tooling
+            cmake-language-server
+
+            # testing
+
+            # pre-commit
+            pre-commit
+            commitizen
+
+            # formatting
+            nodePackages.prettier # markdown formatting
+          ];
+
+          shellHook = ''
+            pre-commit install --allow-missing-config --hook-type pre-commit --hook-type commit-msg
+          '';
+        };
+      }
+    );
+}

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+project(
+  hello
+  VERSION 0.1
+  LANGUAGES CXX)
+
+set(SOURCES src/main.cpp)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS
+    ON
+    CACHE INTERNAL "")
+
+if(CMAKE_EXPORT_COMPILE_COMMANDS)
+  set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
+      ${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})
+endif()
+
+add_executable(hello ${SOURCES})

src/main.cpp

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+#include <iostream>
+
+int main(int argc, char **argv) {
+  std::cout << "Hello" << std::endl;
+  return 0;
+}