bac379f30a
The nixpkgs manual contains references to both sri hash and explicit sha256 attributes. This is at best confusing to new users. Since the final destination is exclusive use of sri hashes, see nixos/rfcs#131, might as well push new users in that direction gently. Notable exceptions to sri hash support are builtins.fetchTarball, cataclysm-dda, coq, dockerTools.pullimage, elixir.override, and fetchCrate. None, other than builtins.fetchTarball, are fundamentally incompatible, but all currently accept explicit sha256 attributes as input. Because adding backwards compatibility is out of scope for this change, they have been left intact, but migration to sri format has been made for any using old hash formats. All hashes have been manually tested to be accurate, and updates were only made for missing upstream artefacts or bugs.
144 lines
3.6 KiB
Markdown
144 lines
3.6 KiB
Markdown
# Idris {#idris}
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## Installing Idris {#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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```ShellSession
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$ nix-env -f "<nixpkgs>" -iA 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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```ShellSession
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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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```ShellSession
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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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```ShellSession
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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 {#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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```ShellSession
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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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```ShellSession
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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 {#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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hash = "sha256-h28F9EEPuvab6zrfeE+0k1XGQJGwINnsJEG8yjWIl7w=";
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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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```ShellSession
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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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```ShellSession
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$ nix-build -A yaml
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```
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## Passing options to `idris` commands {#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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```nix
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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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