R: Difference between revisions

Line 74:

</syntaxhighlight>

== R with Flakes and nix-direnv==

R and accompanying R-packages can be installed using a [https://nixos.wiki/wiki/Flakes Flake] and then managed/activated with [https://github.com/nix-community/nix-direnv nix-direnv] to create a reproducible development environment. After the initial setup of nix-direnv (instructions provided on the GitHub README), there is a [https://github.com/nix-community/nix-direnv/blob/master/templates/flake/flake.nix flake template] provided by the nix-direnv maintainers to get started. Run <code>nix flake new -t github:nix-community/nix-direnv .</code> to initialize the flake template in your current directory. This will create a `flake.nix` file that can be edited to setup the R-environment:

{

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 {

devShells.default = pkgs.mkShell {

nativeBuildInputs = [ pkgs.bashInteractive ];

buildInputs = with pkgs; [ R rPackages.pagedown chromium pandoc ];

};

});

}

</syntaxhighlight>

Saving the file and then running <code>direnv allow</code> in the terminal of the project directory will execute the `flake.lock` and build the shell. This will install the current version of R and the R-package {pagedown} that is in <nixpkgs>. Note additional system dependencies may need installed for certain packages to work such as pandoc for document conversion with {rmarkdown}. Here, chromium is installed in the `buildInputs` so the <code>chrome_print</code> function can be used from {pagedown}.

[https://github.com/wbolster/emacs-direnv Emacs has support for direnv] which can be setup to use R with ESS. Direnv functionality can also be set in Doom Emacs under :tools in the `init.el` file in `.doom.d` folder.

== A note on knitr ==