sile 0.15.6

Simon’s Improved Layout Engine
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{
  description = "Simon’s Improved Layout Engine";

  # To make user overrides of the nixpkgs flake not take effect
  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.gitignore = {
    url = "github:hercules-ci/gitignore.nix";
    inputs.nixpkgs.follows = "nixpkgs";
  };
  # TODO: Should this be replaced with libtexpdf package from nixpkgs? or
  # should we keep it that way, so that it'd be easy to test new versions
  # of libtexpdf when developing?
  inputs.libtexpdf-src = {
    url = "github:sile-typesetter/libtexpdf";
    flake = false;
  };

  # https://wiki.nixos.org/wiki/Flakes#Using_flakes_with_stable_Nix
  inputs.flake-compat = {
    url = "github:edolstra/flake-compat";
    flake = false;
  };

  outputs =
    {
      self,
      nixpkgs,
      flake-utils,
      flake-compat,
      gitignore,
      libtexpdf-src,
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs {
          inherit system;
        };
        inherit (gitignore.lib) gitignoreSource;
        # https://discourse.nixos.org/t/passing-git-commit-hash-and-tag-to-build-with-flakes/11355/2
        version_rev = if (self ? rev) then (builtins.substring 0 7 self.rev) else "dirty";
        sile = pkgs.callPackage ./build-aux/pkg.nix {
          version = "${(pkgs.lib.importJSON ./package.json).version}-${version_rev}-flake";
          src = pkgs.lib.cleanSourceWith {
            # Ignore many files that gitignoreSource doesn't ignore, see:
            # https://github.com/hercules-ci/gitignore.nix/issues/9#issuecomment-635458762
            filter =
              path: type:
              !(builtins.any (r: (builtins.match r (builtins.baseNameOf path)) != null) [
                # Nix files
                "flake.nix"
                "flake.lock"
                "default.nix"
                "shell.nix"
                # git commit and editing format files
                ".commitlintrc.yml"
                "package.json"
                ".husky"
                ".editorconfig"
                # CI files
                ".cirrus.yml"
                ".github"
                "action.yml"
                "azure-pipelines.yml"
                "Dockerfile"
                # Git files
                ".gitattributes"
                ".git"
              ]);
            src = gitignoreSource ./.;
          };
          inherit libtexpdf-src;
        };
        inherit (sile.passthru) luaEnv;
      in
      rec {
        devShells = {
          default = pkgs.mkShell {
            inherit (sile)
              buildInputs
              nativeCheckInputs
              FONTCONFIG_FILE
              ;
            configureFlags = sile.configureFlags ++ [
              "--enable-developer-mode"
              "--with-manual"
            ];
            nativeBuildInputs = sile.nativeBuildInputs ++ [
              pkgs.luarocks
              # For regression test diff highlighting
              pkgs.delta
              # For commitlint git hook
              pkgs.yarn
              # For npx
              pkgs.nodejs
              # For gs, dot, and bsdtar used in building the manual
              pkgs.ghostscript
              pkgs.graphviz
              pkgs.libarchive
            ];
          };
        };
        packages = {
          sile-lua5_2 = sile;
          sile-lua5_3 = sile.override {
            lua = pkgs.lua5_3;
          };
          sile-lua5_4 = sile.override {
            lua = pkgs.lua5_4;
          };
          sile-luajit = sile.override {
            lua = pkgs.luajit;
          };
          sile-clang = sile.override {
            lua = pkgs.luajit;
            # Use the same clang version as Nixpkgs' rust clang stdenv
            stdenv = pkgs.rustc.llvmPackages.stdenv;
          };
        };
        defaultPackage = packages.sile-luajit;
        apps = rec {
          default = sile;
          sile = {
            type = "app";
            program = "${self.defaultPackage.${system}}/bin/sile";
          };
        };
        defaultApp = apps.sile;
      }
    );
}