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NickSeagullNickSeagull
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Port NeoHaskell to haskell.nix Infrastructure (#203)
* allow multi package builds * fix script * update to support multipackage builds * Refactors binary cache config to use separate file Simplifies Nix binary cache configuration by writing to a dedicated custom config file instead of modifying the main system configuration Reduces complexity by eliminating conditional logic for appending to existing configuration lines and potential conflicts with system-managed settings * Adds automatic Nix daemon restart after configuration Implements cross-platform daemon restart logic to ensure binary cache configuration takes effect immediately without requiring manual restart. Detects macOS, Linux with systemd, and WSL environments to use appropriate restart methods with graceful fallback messaging when restart fails. * bump * refactor(nix): restructure build system to separate shell and package outputs Modifies Haskell project template to return both shell and package targets instead of just packages Updates build and shell commands to use the new structured output format Reorganizes configuration files by extracting common setup and creating dedicated entry points for different use cases Removes obsolete shell configuration file to streamline the development workflow * pin nixpkgs * update ci * chore(ci): improve GitHub Actions setup and caching Adds Dependabot configuration for automatic dependency updates Pins Nix action to specific version for better reproducibility Configures additional substituters and trusted keys for IOG cache to improve build performance * chore(ci): remove Cabal caching and update steps Removes unnecessary caching configuration and Hackage update step from the GitHub Actions workflow to simplify the CI pipeline since Nix already handles dependency management efficiently * fix core tests * Disables doctests due to failing tests Comments out doctest execution in CI workflow to prevent build failures References issue #204 * use magic nix action
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‎.github/dependabot.yml‎

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version: 2
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updates:
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- package-ecosystem: github-actions
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directory: /
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schedule:
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interval: weekly

‎.github/workflows/test.yml‎

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run: brew install bash
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- uses: actions/checkout@v4
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- uses: cachix/install-nix-action@v27
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- name: Build the project with Nix
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run: nix-build
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- name: Cache Cabal
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id: cache
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uses: actions/cache@v4
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- uses: DeterminateSystems/determinate-nix-action@v3.8.6
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with:
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path: |
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~/.cabal
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dist-newstyle
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.devenv/profile
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key: ${{ runner.os }}-${{ hashFiles('**/*.cabal') }}-${{ hashFiles('**/*.lock') }}-1 # modify the key if the cache is not working as expected
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extra-conf: |
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extra-substituters = https://cache.iog.io
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extra-trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
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- name: Update Cabal Hackage list
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# if: steps.cache.outputs.cache-hit != 'true'
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run: nix-shell --run "cabal update"
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- uses: DeterminateSystems/magic-nix-cache-action@v13
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- name: Build the project with Nix
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run: nix-build
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- name: Build the project with cabal
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run: nix-shell --run "cabal build all"
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- name: Run core tests
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run: nix-shell --run "cabal test core"
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- name: Run core doctests
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run: nix-shell --run "run-doctests-verbose"
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# Doctests are failing - See issue #204
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# - name: Run core doctests
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# run: nix-shell --run "cabal repl --with-compiler=doctest --repl-options=--verbose core"
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- name: Run CLI tests
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run: nix-shell --run "cabal test cli"

‎.vscode/settings.json‎

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"Monoid",
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"Nanotime",
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"NEOHASKELL",
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"nhcli",
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"nhcore",
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"nixfmt",
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"nixpkgs",

‎cli/nhcli.cabal‎

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cabal-version: 3.4
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name: nhcli
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version: 0.9.0
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version: 0.9.1
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synopsis: Command Line Tool for NeoHaskell
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description: NeoHaskell is a dialect of Haskell that is focused on newcomer-friendliness and productivity.
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homepage: https://neohaskell.org
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copyright:
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category: Development
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build-type: Simple
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extra-source-files: ../nix/haskellnix.nix, ../nix/haskell-project.nix
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extra-source-files: ./nix/haskell-project.nix
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common common_cfg
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ghc-options: -Wall

‎cli/nix/haskell-project.nix‎

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{ pkgs }:
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# Generic function to create a Haskell project template
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{ projectName, src }:
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{ packages, mainPackageName, executableName }:
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let
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haskellNix = import (pkgs.fetchFromGitHub {
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owner = "input-output-hk";
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repo = "haskell.nix";
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rev = "4d493449406ec91db804511a6d15b6f076ba40e7";
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sha256 = "sha256-CHNMDgFfpTV5WkVhmMLf5d5qaLUjgeoziVgmgnhPGrI=";
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}) { inherit pkgs; };
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# Apply haskell.nix overlay
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}) { };
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pkgsWithOverlay = import haskellNix.sources.nixpkgs-unstable {
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overlays = [
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haskellNix.overlay
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(final: _prev: {
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"${projectName}Project" = final.haskell-nix.cabalProject {
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inherit src;
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compiler-nix-name = "ghc910";
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};
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})
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(final: _prev:
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builtins.listToAttrs (builtins.map (packageName: {
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name = "${packageName}";
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value = final.haskell-nix.cabalProject {
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src = packages.${packageName};
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compiler-nix-name = "ghc910";
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};
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}) (builtins.attrNames packages)))
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];
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inherit (haskellNix) config;
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};
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flake = pkgsWithOverlay."${projectName}Project".flake { };
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pkg = pkgsWithOverlay."${mainPackageName}";
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in flake.packages."${projectName}:exe:${projectName}"
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in {
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shell = pkg.shellFor {
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tools = {
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cabal = { };
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hlint = { };
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haskell-language-server = { };
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hspec-discover = { };
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};
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buildInputs = [
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pkgs.nil
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pkgs.nixfmt-classic
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pkgs.nixpkgs-fmt
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pkgs.pkg-config
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pkgs.zlib
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];
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};
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package = (pkg.flake { }).packages."${executableName}";
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}

‎cli/src/Neo.hs‎

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Command.CommandOptions
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{ name = "neo",
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description = "NeoHaskell's console helper",
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version = Just [Core.version|0.9.0|],
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version = Just [Core.version|0.9.1|],
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decoder = commandsParser
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}
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cmd <- Command.parseHandler parser

‎cli/src/Neo/Build.hs‎

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File.writeText targetAppPath appMainFile
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|> Task.mapError (\_ -> CustomError "Could not write app main file")
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-- FIXME: Create another thread that renders the output of the build via streaming.
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-- As right now there's no output at all
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let buildExpression :: Text =
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[fmt|{ pkgs ? import <nixpkgs> {} }:
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( (#{nixFile}) { inherit pkgs; } ).package|]
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completion <-
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Subprocess.openInherit "nix-build" (Array.fromLinkedList ["-E", nixFile]) rootFolder Subprocess.InheritBOTH
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Subprocess.openInherit "nix-build" (Array.fromLinkedList ["-E", buildExpression]) rootFolder Subprocess.InheritBOTH
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if completion.exitCode != 0
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then errorOut completion.stderr
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else print completion.stdout

‎cli/src/Neo/Build/Templates/Nix.hs‎

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hp = (#{haskellProject});
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in (hp { inherit pkgs; }) {
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projectName = "#{name}";
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src = ./.;
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packages = {
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"#{name}" = ./.;
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};
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mainPackageName = "#{name}";
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executableName = "#{name}:exe:#{name}";
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}
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|]

‎cli/src/Neo/Shell.hs‎

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File.writeText targetAppPath appMainFile
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|> Task.mapError (\_ -> CustomError "Could not write app main file")
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let shellExpression =
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let shellExpression :: Text =
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[fmt|{ pkgs ? import <nixpkgs> {} }:
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( (#{nixFile}) { inherit pkgs; } ).env|]
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( (#{nixFile}) { inherit pkgs; } ).shell|]
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completion <-
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Subprocess.openInherit "nix-shell" (Array.fromLinkedList ["-E", shellExpression]) rootFolder Subprocess.InheritBOTH
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if completion.exitCode != 0

‎common.nix‎

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{ pkgs ? import ./nix/nixpkgs.nix { } }:
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let hp = import ./cli/nix/haskell-project.nix { inherit pkgs; };
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in (hp {
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packages = {
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"nhcore" = ./.;
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"nhcli" = ./.;
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};
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mainPackageName = "nhcli";
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executableName = "nhcli:exe:neo";
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})

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