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# Development shells
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To make development on NixOS slightly less excruciating, libkookie
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ships with a set of development shells. These are environments that
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can be included a by projects to provide the basic set of tools
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required by a language or development framework.
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libkookie itself then provides the `<shells>` key in the NIX_PATH,
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which means that existing shells can easily be included and layered by
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other `shell.nix` files.
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## How to use
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Create a `shell.nix` for a project that you want to include (and
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optionally `.envrc` for lorri). The tool `msh` (Make SHell) is
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available to generate these based on common defaults. Afterwards both
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`lorri` and `nix-shell` will be able to pick up the required
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environment for development.
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```nix
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{...}: import <shells/rust/stable> {}
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```
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The above snippet includes the basic Rust development toolchain. You
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can also provide a set of additional packages to install
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```nix
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import <shells/rust/stable> {
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userPackages = (pkgs: [ pkgs.hello ]);
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}
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```
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You can also include `<shells/rust/nightly>` which will get the latest
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nightly compiler with a complete toolchain. This feature is
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implemented via the
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[oxalica/rust-overlay](https://github.com/oxalica/rust-overlay/).
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