Flake for helix + steel

.gitignore

# Nix
result*

# Misc
.direnv

flake.lock

{
  "nodes": {
    "cogs": {
      "flake": false,
      "locked": {
        "lastModified": 1750629192,
        "narHash": "sha256-1g9j8M9JBiVnQb/pEmKNJ1lXfEPJpUScVk5RTV85bwM=",
        "owner": "mattwparas",
        "repo": "helix-config",
        "rev": "b651bde993a2b2f588d4c9de3ec02f21c66e976b",
        "type": "github"
      },
      "original": {
        "owner": "mattwparas",
        "repo": "helix-config",
        "type": "github"
      }
    },
    "flake-compat": {
      "locked": {
        "lastModified": 1733328505,
        "narHash": "sha256-NeCCThCEP3eCl2l/+27kNNK7QrwZB1IJCrXfrbv5oqU=",
        "owner": "edolstra",
        "repo": "flake-compat",
        "rev": "ff81ac966bb2cae68946d5ed5fc4994f96d0ffec",
        "type": "github"
      },
      "original": {
        "owner": "edolstra",
        "repo": "flake-compat",
        "type": "github"
      }
    },
    "flake-parts": {
      "inputs": {
        "nixpkgs-lib": [
          "steel",
          "nixpkgs"
        ]
      },
      "locked": {
        "lastModified": 1743550720,
        "narHash": "sha256-hIshGgKZCgWh6AYJpJmRgFdR3WUbkY04o82X05xqQiY=",
        "owner": "hercules-ci",
        "repo": "flake-parts",
        "rev": "c621e8422220273271f52058f618c94e405bb0f5",
        "type": "github"
      },
      "original": {
        "owner": "hercules-ci",
        "repo": "flake-parts",
        "type": "github"
      }
    },
    "flake-utils": {
      "inputs": {
        "systems": "systems"
      },
      "locked": {
        "lastModified": 1731533236,
        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
        "owner": "numtide",
        "repo": "flake-utils",
        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
        "type": "github"
      },
      "original": {
        "owner": "numtide",
        "repo": "flake-utils",
        "type": "github"
      }
    },
    "helix": {
      "inputs": {
        "nixpkgs": [
          "nixpkgs"
        ],
        "rust-overlay": "rust-overlay"
      },
      "locked": {
        "lastModified": 1754773544,
        "narHash": "sha256-P/cVepOCWXR7WvhQif0SQmOxFjVf6e9/dPDr8BwBW9k=",
        "owner": "mattwparas",
        "repo": "helix",
        "rev": "374412acf03d2764c73c242e67fb2640bfdf4f65",
        "type": "github"
      },
      "original": {
        "owner": "mattwparas",
        "ref": "steel-event-system",
        "repo": "helix",
        "type": "github"
      }
    },
    "nixpkgs": {
      "locked": {
        "lastModified": 1753939845,
        "narHash": "sha256-K2ViRJfdVGE8tpJejs8Qpvvejks1+A4GQej/lBk5y7I=",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "94def634a20494ee057c76998843c015909d6311",
        "type": "github"
      },
      "original": {
        "owner": "NixOS",
        "ref": "nixos-unstable",
        "repo": "nixpkgs",
        "type": "github"
      }
    },
    "root": {
      "inputs": {
        "cogs": "cogs",
        "flake-utils": "flake-utils",
        "helix": "helix",
        "nixpkgs": "nixpkgs",
        "steel": "steel"
      }
    },
    "rust-overlay": {
      "inputs": {
        "nixpkgs": [
          "helix",
          "nixpkgs"
        ]
      },
      "locked": {
        "lastModified": 1740623427,
        "narHash": "sha256-3SdPQrZoa4odlScFDUHd4CUPQ/R1gtH4Mq9u8CBiK8M=",
        "owner": "oxalica",
        "repo": "rust-overlay",
        "rev": "d342e8b5fd88421ff982f383c853f0fc78a847ab",
        "type": "github"
      },
      "original": {
        "owner": "oxalica",
        "repo": "rust-overlay",
        "type": "github"
      }
    },
    "steel": {
      "inputs": {
        "flake-compat": "flake-compat",
        "flake-parts": "flake-parts",
        "nixpkgs": [
          "nixpkgs"
        ],
        "systems": "systems_2",
        "treefmt-nix": "treefmt-nix"
      },
      "locked": {
        "lastModified": 1754772587,
        "narHash": "sha256-3yexvzmVADPMVlDYMWSRjwjCKICBD7ttP4RLC1jBR9U=",
        "owner": "mattwparas",
        "repo": "steel",
        "rev": "6d64abcc789784788b3abfa003d89cb434c10b54",
        "type": "github"
      },
      "original": {
        "owner": "mattwparas",
        "repo": "steel",
        "type": "github"
      }
    },
    "systems": {
      "locked": {
        "lastModified": 1681028828,
        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
        "owner": "nix-systems",
        "repo": "default",
        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
        "type": "github"
      },
      "original": {
        "owner": "nix-systems",
        "repo": "default",
        "type": "github"
      }
    },
    "systems_2": {
      "locked": {
        "lastModified": 1681028828,
        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
        "owner": "nix-systems",
        "repo": "default",
        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
        "type": "github"
      },
      "original": {
        "owner": "nix-systems",
        "repo": "default",
        "type": "github"
      }
    },
    "treefmt-nix": {
      "inputs": {
        "nixpkgs": [
          "steel",
          "nixpkgs"
        ]
      },
      "locked": {
        "lastModified": 1743748085,
        "narHash": "sha256-uhjnlaVTWo5iD3LXics1rp9gaKgDRQj6660+gbUU3cE=",
        "owner": "numtide",
        "repo": "treefmt-nix",
        "rev": "815e4121d6a5d504c0f96e5be2dd7f871e4fd99d",
        "type": "github"
      },
      "original": {
        "owner": "numtide",
        "repo": "treefmt-nix",
        "type": "github"
      }
    }
  },
  "root": "root",
  "version": 7
}

flake.nix

{
  description = "Helix + Steel";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";

    helix = {
      url = "github:mattwparas/helix?ref=steel-event-system";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    steel = {
      url = "github:mattwparas/steel";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    cogs = {
      url = "github:mattwparas/helix-config";
      flake = false;
    };
  };

  outputs =
    {
      nixpkgs,
      flake-utils,
      helix,
      cogs,
      steel,
      ...
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = nixpkgs.legacyPackages.${system}.extend helix.overlays.default;
        steel' = steel.packages.${system}.default;

        steelHome = "$out/lib/steel";

        helix' = pkgs.helix.overrideAttrs (prev: {
          nativeBuildInputs = prev.nativeBuildInputs ++ [ steel' ];

          cargoBuildFeatures = prev.cargoBuildFeatures ++ [ "steel" ];

          patches = prev.patches ++ [
            (pkgs.writeText "skip-source-gen.patch" ''
              diff --git c/helix-term/src/commands/engine/steel/mod.rs i/helix-term/src/commands/engine/steel/mod.rs
              index 4c1d9b10..454f90d4 100644
              --- c/helix-term/src/commands/engine/steel/mod.rs
              +++ i/helix-term/src/commands/engine/steel/mod.rs
              @@ -4421,11 +4421,11 @@ fn configure_engine_impl(mut engine: Engine) -> Engine {
                   engine.register_value(
                       "*helix.id*",
                       SteelVal::IntV(engine.engine_id().as_usize() as _),
                   );
               
              -    configure_builtin_sources(&mut engine, true);
              +    configure_builtin_sources(&mut engine, false);
               
                   // Hooks
                   engine.register_fn("register-hook!", register_hook);
                   engine.register_fn("log::info!", |message: SteelVal| {
                       if let SteelVal::StringV(s) = &message {
            '')
          ];

          postBuild = ''
            ${prev.postBuild or ""}

            export STEEL_HOME="${steelHome}"
            export CARGO_HOME="$TMPDIR/.cargo"

            cargo build -p xtask --features helix-term/steel
            forge build ${cogs} || exit 1
          '';

          preInstall = ''
            ${prev.preInstall or ""}

            export STEEL_HOME="${steelHome}"
            export CARGO_HOME="$TMPDIR/.cargo"

            mkdir -p ${steelHome}/cogs/helix

            cargo run -p xtask --features helix-term/steel -- code-gen || exit 1
            forge install ${cogs} || exit 1
          '';
        });
      in
      {
        packages =
          let
            inherit (pkgs) lib makeWrapper;
            wrapExe =
              prog: # bash
              ''wrapProgram "$out/bin/${prog}" --set STEEL_HOME "${steelHome}"'';

            wrapExes = lib.concatMapStringsSep "\n" wrapExe [
              "hx"
              "steel"
              "forge"
              "repl-connect"
              "cargo-steel-lib"
              "steel-language-server"
            ];
          in
          {
            helix = helix';

            default = pkgs.symlinkJoin {
              name = "helix-cogs";
              paths = [
                helix'
                steel'
              ];
              buildInputs = [
                makeWrapper
                steel'
              ];

              preInstall = ''
                ${wrapExes}

                mkdir -p $out/share/fish/vendor_completions.d/
                steel completions fish > $out/share/fish/vendor_completions.d/steel.fish
              '';

              meta.mainProgram = "hx";
            };
          };
      }
    );
}