91 lines
2.9 KiB
Markdown
91 lines
2.9 KiB
Markdown
# Nim {#nim}
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## Overview {#nim-overview}
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The Nim compiler, a builder function, and some packaged libraries are available
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in Nixpkgs. Until now each compiler release has been effectively backwards
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compatible so only the latest version is available.
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## Nim program packages in Nixpkgs {#nim-program-packages-in-nixpkgs}
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Nim programs can be built using `nimPackages.buildNimPackage`. In the
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case of packages not containing exported library code the attribute
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`nimBinOnly` should be set to `true`.
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The following example shows a Nim program that depends only on Nim libraries:
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```nix
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{ lib, nimPackages, fetchurl }:
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nimPackages.buildNimPackage rec {
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pname = "hottext";
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version = "1.4";
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nimBinOnly = true;
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src = fetchurl {
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url = "https://git.sr.ht/~ehmry/hottext/archive/v${version}.tar.gz";
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sha256 = "sha256-hIUofi81zowSMbt1lUsxCnVzfJGN3FEiTtN8CEFpwzY=";
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};
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buildInputs = with nimPackages; [
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bumpy
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chroma
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flatty
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nimsimd
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pixie
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sdl2
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typography
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vmath
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zippy
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];
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}
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```
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## Nim library packages in Nixpkgs {#nim-library-packages-in-nixpkgs}
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Nim libraries can also be built using `nimPackages.buildNimPackage`, but
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often the product of a fetcher is sufficient to satisfy a dependency.
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The `fetchgit`, `fetchFromGitHub`, and `fetchNimble` functions yield an
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output that can be discovered during the `configurePhase` of `buildNimPackage`.
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Nim library packages are listed in
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[pkgs/top-level/nim-packages.nix](https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/nim-packages.nix) and implemented at
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[pkgs/development/nim-packages](https://github.com/NixOS/nixpkgs/tree/master/pkgs/development/nim-packages).
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The following example shows a Nim library that propagates a dependency on a
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non-Nim package:
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```nix
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{ lib, buildNimPackage, fetchNimble, SDL2 }:
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buildNimPackage rec {
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pname = "sdl2";
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version = "2.0.4";
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src = fetchNimble {
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inherit pname version;
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hash = "sha256-Vtcj8goI4zZPQs2TbFoBFlcR5UqDtOldaXSH/+/xULk=";
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};
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propagatedBuildInputs = [ SDL2 ];
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}
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```
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## `buildNimPackage` parameters {#buildnimpackage-parameters}
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All parameters from `stdenv.mkDerivation` function are still supported. The
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following are specific to `buildNimPackage`:
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* `nimBinOnly ? false`: If `true` then build only the programs listed in
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the Nimble file in the packages sources.
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* `nimbleFile`: Specify the Nimble file location of the package being built
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rather than discover the file at build-time.
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* `nimRelease ? true`: Build the package in *release* mode.
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* `nimDefines ? []`: A list of Nim defines. Key-value tuples are not supported.
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* `nimFlags ? []`: A list of command line arguments to pass to the Nim compiler.
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Use this to specify defines with arguments in the form of `-d:${name}=${value}`.
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* `nimDoc` ? false`: Build and install HTML documentation.
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* `buildInputs` ? []: The packages listed here will be searched for `*.nimble`
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files which are used to populate the Nim library path. Otherwise the standard
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behavior is in effect.
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