69 lines
3.1 KiB
Markdown
69 lines
3.1 KiB
Markdown
# Julia {#language-julia}
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## Introduction {#julia-introduction}
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Nixpkgs includes Julia as the `julia` derivation.
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You can get specific versions by looking at the other `julia*` top-level derivations available.
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For example, `julia_19` corresponds to Julia 1.9.
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We also provide the current stable version as `julia-stable`, and an LTS version as `julia-lts`.
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Occasionally, a Julia version has been too difficult to build from source in Nixpkgs and has been fetched prebuilt instead.
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These Julia versions are differentiated with the `*-bin` suffix; for example, `julia-stable-bin`.
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## julia.withPackages {#julia-withpackage}
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The basic Julia derivations only provide the built-in packages that come with the distribution.
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You can build Julia environments with additional packages using the `julia.withPackages` command.
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This function accepts a list of strings representing Julia package names.
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For example, you can build a Julia environment with the `Plots` package as follows.
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```nix
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julia.withPackages ["Plots"]
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```
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Arguments can be passed using `.override`.
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For example:
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```nix
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(julia.withPackages.override {
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precompile = false; # Turn off precompilation
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}) ["Plots"]
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```
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Here's a nice way to run a Julia environment with a shell one-liner:
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```sh
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nix-shell -p 'julia.withPackages ["Plots"]' --run julia
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```
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### Arguments {#julia-withpackage-arguments}
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* `precompile`: Whether to run `Pkg.precompile()` on the generated environment.
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This will make package imports faster, but may fail in some cases.
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For example, there is an upstream issue with `Gtk.jl` that prevents precompilation from working in the Nix build sandbox, because the precompiled code tries to access a display.
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Packages like this will work fine if you build with `precompile=false`, and then precompile as needed once your environment starts.
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Defaults: `true`
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* `extraLibs`: Extra library dependencies that will be placed on the `LD_LIBRARY_PATH` for Julia.
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Should not be needed as we try to obtain library dependencies automatically using Julia's artifacts system.
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* `makeWrapperArgs`: Extra arguments to pass to the `makeWrapper` call which we use to wrap the Julia binary.
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* `setDefaultDepot`: Whether to automatically prepend `$HOME/.julia` to the `JULIA_DEPOT_PATH`.
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This is useful because Julia expects a writable depot path as the first entry, which the one we build in Nixpkgs is not.
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If there's no writable depot, then Julia will show a warning and be unable to save command history logs etc.
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Default: `true`
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* `packageOverrides`: Allows you to override packages by name by passing an alternative source.
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For example, you can use a custom version of the `LanguageServer` package by passing `packageOverrides = { "LanguageServer" = fetchFromGitHub {...}; }`.
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* `augmentedRegistry`: Allows you to change the registry from which Julia packages are drawn.
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This normally points at a special augmented version of the Julia [General packages registry](https://github.com/JuliaRegistries/General).
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If you want to use a bleeding-edge version to pick up the latest package updates, you can plug in a later revision than the one in Nixpkgs.
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