cppfront: init at 0.8.1 (#409126)

pkgs/by-name/cp/cppfront/package.nix

@@ -0,0 +1,105 @@
+{
+  stdenv,
+  lib,
+  fetchFromGitHub,
+  installShellFiles,
+  nix-update-script,
+  versionCheckHook,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "cppfront";
+  version = "0.8.1";
+
+  src = fetchFromGitHub {
+    owner = "hsutter";
+    repo = "cppfront";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-QYjon2EpNexYa2fl09AePkpq0LkRVBOQM++eldcVMvI=";
+  };
+
+  nativeBuildInputs = [
+    installShellFiles
+  ];
+
+  # Remove with next release
+  postPatch = ''
+    substituteInPlace source/version.info \
+      --replace-fail "0.8.0" "0.8.1"
+  '';
+
+  dontConfigure = true;
+
+  buildPhase = ''
+    runHook preBuild
+
+    $CXX source/cppfront.cpp -std=c++20 -o cppfront
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    installBin cppfront
+    cp -r include $out/include
+
+    runHook postInstall
+  '';
+
+  nativeInstallCheckInputs = [
+    versionCheckHook
+  ];
+  versionCheckProgramArg = "-version";
+  doInstallCheck = true;
+
+  passthru = {
+    updateScript = nix-update-script { };
+
+    tests.hello-world = stdenv.mkDerivation (finalAttrs': {
+      pname = "${finalAttrs.pname}-hello-world-test";
+      inherit (finalAttrs) version src;
+
+      sourceRoot = "${finalAttrs'.src.name}/regression-tests";
+
+      nativeBuildInputs = [
+        finalAttrs.finalPackage
+        installShellFiles
+      ];
+
+      postBuild = ''
+        cppfront pure2-hello.cpp2
+        $CXX -std=c++20 -o pure2-hello{,.cpp}
+      '';
+
+      postInstall = ''
+        installBin pure2-hello
+      '';
+
+      doInstallCheck = true;
+      postInstallCheck = ''
+        $out/bin/pure2-hello | grep '^Hello \[world\]$' > /dev/null
+      '';
+
+      meta = {
+        inherit (finalAttrs.meta) maintainers platforms;
+        mainProgram = "pure2-hello";
+      };
+    });
+  };
+
+  meta = {
+    description = "Experimental compiler from a potential C++ 'syntax 2' (Cpp2) to today's 'syntax 1' (Cpp1)";
+    homepage = "https://hsutter.github.io/cppfront/";
+    changelog = "https://github.com/hsutter/cppfront/releases/tag/${finalAttrs.src.tag}";
+    mainProgram = "cppfront";
+    license = with lib.licenses; [
+      asl20
+      llvm-exception
+    ];
+    maintainers = with lib.maintainers; [
+      marcin-serwin
+    ];
+    platforms = lib.platforms.all;
+  };
+})