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# Idris {#idris}
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## Installing Idris
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The easiest way to get a working idris version is to install the `idris` attribute:
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```ShellSesssion
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$ # On NixOS
$ nix-env -i nixos.idris
$ # On non-NixOS
$ nix-env -i nixpkgs.idris
```
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This however only provides the `prelude` and `base` libraries. To install idris with additional libraries, you can use the `idrisPackages.with-packages` function, e.g. in an overlay in `~/.config/nixpkgs/overlays/my-idris.nix` :
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```nix
self: super: {
myIdris = with self.idrisPackages; with-packages [ contrib pruviloj ];
}
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```
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And then:
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```ShellSesssion
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$ # On NixOS
$ nix-env -iA nixos.myIdris
$ # On non-NixOS
$ nix-env -iA nixpkgs.myIdris
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```
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To see all available Idris packages:
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```ShellSesssion
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$ # On NixOS
$ nix-env -qaPA nixos.idrisPackages
$ # On non-NixOS
$ nix-env -qaPA nixpkgs.idrisPackages
```
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Similarly, entering a `nix-shell` :
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```ShellSesssion
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$ nix-shell -p 'idrisPackages.with-packages (with idrisPackages; [ contrib pruviloj ])'
```
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## Starting Idris with library support
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To have access to these libraries in idris, call it with an argument `-p <library name>` for each library:
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```ShellSesssion
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$ nix-shell -p 'idrisPackages.with-packages (with idrisPackages; [ contrib pruviloj ])'
[nix-shell:~]$ idris -p contrib -p pruviloj
```
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A listing of all available packages the Idris binary has access to is available via `--listlibs` :
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```ShellSesssion
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$ idris --listlibs
00prelude-idx.ibc
pruviloj
base
contrib
prelude
00pruviloj-idx.ibc
00base-idx.ibc
00contrib-idx.ibc
```
## Building an Idris project with Nix
As an example of how a Nix expression for an Idris package can be created, here is the one for `idrisPackages.yaml` :
```nix
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{ lib
, build-idris-package
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, fetchFromGitHub
, contrib
, lightyear
}:
build-idris-package {
name = "yaml";
version = "2018-01-25";
# This is the .ipkg file that should be built, defaults to the package name
# In this case it should build `Yaml.ipkg` instead of `yaml.ipkg`
# This is only necessary because the yaml packages ipkg file is
# different from its package name here.
ipkgName = "Yaml";
# Idris dependencies to provide for the build
idrisDeps = [ contrib lightyear ];
src = fetchFromGitHub {
owner = "Heather";
repo = "Idris.Yaml";
rev = "5afa51ffc839844862b8316faba3bafa15656db4";
sha256 = "1g4pi0swmg214kndj85hj50ccmckni7piprsxfdzdfhg87s0avw7";
};
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meta = with lib; {
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description = "Idris YAML lib";
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homepage = "https://github.com/Heather/Idris.Yaml";
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license = licenses.mit;
maintainers = [ maintainers.brainrape ];
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};
}
```
Assuming this file is saved as `yaml.nix` , it's buildable using
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```ShellSesssion
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$ nix-build -E '(import < nixpkgs > {}).idrisPackages.callPackage ./yaml.nix {}'
```
Or it's possible to use
```nix
with import < nixpkgs > {};
{
yaml = idrisPackages.callPackage ./yaml.nix {};
}
```
in another file (say `default.nix` ) to be able to build it with
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```ShellSesssion
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$ nix-build -A yaml
```
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## Passing options to `idris` commands
The `build-idris-package` function provides also optional input values to set additional options for the used `idris` commands.
Specifically, you can set `idrisBuildOptions` , `idrisTestOptions` , `idrisInstallOptions` and `idrisDocOptions` to provide additional options to the `idris` command respectively when building, testing, installing and generating docs for your package.
For example you could set
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```nix
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build-idris-package {
idrisBuildOptions = [ "--log" "1" "--verbose" ]
...
}
```
to require verbose output during `idris` build phase.