Hello World

Standard features a special project structure that brings some awesome innovation to this often overlooked (but important) part of your project. With the default Cell Blocks, an apps.nix file tells Standard that we are creating an Application. flake.nix is in charge of explicitly defining the inputs of your project.

Btw, you can can copy * the following files from here.

* don't just clone the std repo: flakes in subfolders don't work that way.

/tmp/play-with-std/hello-world/flake.nix

{
  inputs.std.url = "github:divnix/std";
  inputs.nixpkgs.url = "nixpkgs";

  outputs = {std, ...} @ inputs:
    std.grow {
      inherit inputs;
      cellsFrom = ./cells;
    };
}

/tmp/play-with-std/hello-world/cells/hello/apps.nix

{
  inputs,
  cell,
}: {
  default = inputs.nixpkgs.stdenv.mkDerivation rec {
    pname = "hello";
    version = "2.10";
    src = inputs.nixpkgs.fetchurl {
      url = "mirror://gnu/hello/${pname}-${version}.tar.gz";
      sha256 = "0ssi1wpaf7plaswqqjwigppsg5fyh99vdlb9kzl7c9lng89ndq1i";
    };
  };
}

$ cd /tmp/play-with-std/hello-world/
$ git init && git add . && git commit -m"nix flakes only can see files under version control"
# fetch `std`
$ nix shell github:divnix/std
$ std //hello/apps/default:run
Hello, world!

You see? from nothing to running your first application in just a few seconds ✨

Assumptions

This example consumes the following defaults or builtins:

[Default cellBlocks][grow-nix-default-cellblocks]

{
  cellBlocks ? [
    (blockTypes.functions "library")
    (blockTypes.runnables "apps")
    (blockTypes.installables "packages")
  ],
  ...
} @ args:

[Default systems][grow-nix-default-systems]

{
  systems ? [
    "x86_64-linux"
    "aarch64-linux"
    "x86_64-darwin"
    "aarch64-darwin"
  ],
  ...
} @ cfg: