7616206b77
* doc: add function argument order convention Ordering by usage is the de facto ordering given to arguments. It's logical, and makes finding argument usage easier. Putting lib first is common in NixOS modules, so it's reasonable to mirror this in nixpkgs proper. Additionally, it's not a package as such, has zero dependencies, and can be found used anywhere in a derivation. * doc: clean up usage of lib
145 lines
3.4 KiB
Markdown
145 lines
3.4 KiB
Markdown
# 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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```
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$ # On NixOS
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$ nix-env -i nixos.idris
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$ # On non-NixOS
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$ nix-env -i nixpkgs.idris
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```
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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
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self: super: {
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myIdris = with self.idrisPackages; with-packages [ contrib pruviloj ];
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}
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```
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And then:
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```
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$ # On NixOS
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$ nix-env -iA nixos.myIdris
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$ # On non-NixOS
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$ nix-env -iA nixpkgs.myIdris
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```
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To see all available Idris packages:
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```
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$ # On NixOS
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$ nix-env -qaPA nixos.idrisPackages
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$ # On non-NixOS
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$ nix-env -qaPA nixpkgs.idrisPackages
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```
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Similarly, entering a `nix-shell`:
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```
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$ nix-shell -p 'idrisPackages.with-packages (with idrisPackages; [ contrib pruviloj ])'
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```
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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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```
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$ nix-shell -p 'idrisPackages.with-packages (with idrisPackages; [ contrib pruviloj ])'
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[nix-shell:~]$ idris -p contrib -p pruviloj
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```
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A listing of all available packages the Idris binary has access to is available via `--listlibs`:
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```
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$ idris --listlibs
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00prelude-idx.ibc
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pruviloj
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base
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contrib
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prelude
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00pruviloj-idx.ibc
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00base-idx.ibc
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00contrib-idx.ibc
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```
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## Building an Idris project with Nix
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As an example of how a Nix expression for an Idris package can be created, here is the one for `idrisPackages.yaml`:
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```nix
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{ lib
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, build-idris-package
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, fetchFromGitHub
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, contrib
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, lightyear
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}:
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build-idris-package {
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name = "yaml";
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version = "2018-01-25";
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# This is the .ipkg file that should be built, defaults to the package name
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# In this case it should build `Yaml.ipkg` instead of `yaml.ipkg`
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# This is only necessary because the yaml packages ipkg file is
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# different from its package name here.
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ipkgName = "Yaml";
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# Idris dependencies to provide for the build
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idrisDeps = [ contrib lightyear ];
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src = fetchFromGitHub {
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owner = "Heather";
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repo = "Idris.Yaml";
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rev = "5afa51ffc839844862b8316faba3bafa15656db4";
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sha256 = "1g4pi0swmg214kndj85hj50ccmckni7piprsxfdzdfhg87s0avw7";
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};
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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;
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maintainers = [ maintainers.brainrape ];
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};
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}
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```
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Assuming this file is saved as `yaml.nix`, it's buildable using
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```
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$ nix-build -E '(import <nixpkgs> {}).idrisPackages.callPackage ./yaml.nix {}'
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```
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Or it's possible to use
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```nix
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with import <nixpkgs> {};
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{
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yaml = idrisPackages.callPackage ./yaml.nix {};
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}
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```
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in another file (say `default.nix`) to be able to build it with
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```
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$ nix-build -A yaml
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```
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## Passing options to `idris` commands
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The `build-idris-package` function provides also optional input values to set additional options for the used `idris` commands.
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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.
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For example you could set
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```
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build-idris-package {
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idrisBuildOptions = [ "--log" "1" "--verbose" ]
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...
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}
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```
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to require verbose output during `idris` build phase.
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