helix.drv/flake.nix

{
  description = "jolheiser helix derivation";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
  };

  outputs = {
    self,
    nixpkgs,
  }: let
    pkgs = nixpkgs.legacyPackages.x86_64-linux;
    tomlFormat = pkgs.formats.toml {};
    config = import ./config.nix {pkgs = pkgs;};
    buildGrammar = grammar: let
      source = pkgs.fetchgit {
        inherit (grammar) url rev sha256;
      };
      linkQueries = pkgs.lib.optionalString (builtins.hasAttr "queries" grammar) "cp -r ${source}/${grammar.queries} $out/queries";
    in
      pkgs.stdenv.mkDerivation {
        pname = "helix-tree-sitter-grammar-${grammar.name}";
        version = grammar.rev;
        buildInputs = [pkgs.helix pkgs.git];
        src = source;
        dontInstall = true;
        buildPhase = ''
          runHook preBuild

          mkdir .helix
          cat << EOF > .helix/languages.toml
          use-grammars = { only = ["${grammar.name}"] }
          [[grammar]]
          name = "${grammar.name}"
          source = { git = "${grammar.url}", rev = "${grammar.rev}" }
          EOF

          mkdir -p runtime/grammars/sources
          cp -r ${source} runtime/grammars/sources/${grammar.name}
          export CARGO_MANIFEST_DIR=$(pwd)/.helix

          #hx -g fetch
          hx -g build

          mkdir $out
          cp runtime/grammars/${grammar.name}.so $out/${grammar.name}.so
          ${linkQueries}

          runHook postBuild
        '';
      };
    builtGrammars =
      builtins.map (grammar: {
        inherit (grammar) name;
        artifact = buildGrammar grammar;
      })
      config.grammars;
    ignoreFile = pkgs.writeText "ignore" (builtins.concatStringsSep "\n" config.ignore);
    configFile = pkgs.writeText "config.toml" (builtins.readFile (tomlFormat.generate "helix-config" config.settings));
    languageFile = pkgs.writeText "languages.toml" (builtins.readFile (tomlFormat.generate "helix-languages" config.languages));
    themeFiles =
      pkgs.lib.mapAttrsToList (
        name: value: {
          inherit name;
          file = pkgs.writeText "${name}.toml" (builtins.readFile (tomlFormat.generate "helix-theme-${name}" value));
        }
      )
      config.themes;
    themeLinks = builtins.map (theme: "ln -s ${theme.file} $out/home/helix/themes/${theme.name}.toml") themeFiles;
    grammarLinks = builtins.map (grammar: "ln -s ${grammar.artifact}/${grammar.name}.so $out/lib/runtime/grammars/${grammar.name}.so") builtGrammars;
    queryLinks = builtins.map (grammar: "ln -s ${grammar.artifact}/queries $out/lib/runtime/queries/${grammar.name}") builtGrammars;
  in {
    packages.x86_64-linux.default =
      pkgs.runCommand "hx" {
        buildInputs = [pkgs.makeWrapper];
      } ''
        mkdir $out
        ln -s ${pkgs.helix}/* $out
        rm $out/bin

        rm $out/lib
        mkdir -p $out/lib/runtime
        ln -s ${pkgs.helix}/lib/runtime/* $out/lib/runtime

        rm $out/lib/runtime/grammars
        mkdir $out/lib/runtime/grammars
        ln -s ${pkgs.helix}/lib/runtime/grammars/* $out/lib/runtime/grammars
        ${builtins.concatStringsSep "\n" grammarLinks}

        rm $out/lib/runtime/queries
        mkdir $out/lib/runtime/queries
        ln -s ${pkgs.helix}/lib/runtime/queries/* $out/lib/runtime/queries
        ${builtins.concatStringsSep "\n" queryLinks}

        mkdir -p $out/home/helix/themes
        ln -s ${configFile} $out/home/helix/config.toml
        ln -s ${languageFile} $out/home/helix/languages.toml
        ${builtins.concatStringsSep "\n" themeLinks}

        mkdir -p $out/home/git
        ln -s ${ignoreFile} $out/home/git/ignore

        makeWrapper ${pkgs.helix}/bin/.hx-wrapped $out/bin/hx --set HELIX_RUNTIME $out/lib/runtime --set XDG_CONFIG_HOME $out/home
      '';
  };
}