Add Nix Jekyll Build, GitHub Actions artifact, static Java site server

.github/workflows/jekyll-build.yml

@@ -0,0 +1,40 @@
+name: Build Jekyll Site to Tarball
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
+      - name: Setup Nix cache
+        uses: DeterminateSystems/magic-nix-cache-action@main
+
+      - name: Build site and create tarball
+        run: nix run .#tarball
+
+      - name: Upload tarball as artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: bitcoinj-site-${{ github.sha }}
+          path: bitcoinj-site.tar.gz
+          retention-days: 30
+
+      - name: Create release on tag
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v1
+        with:
+          files: bitcoinj-site.tar.gz
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -7,6 +7,35 @@ This is the source-code repository for the **bitcoinj** website, published at [b
 
 This site is written in [GitHub-flavored Markdown](https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/about-writing-and-formatting-on-github), built using the [Jekyll static site generator](https://jekyllrb.com) and published via [GitHub Pages](https://pages.github.com).
 
+## Building locally in a Nix Shell
+
+The Nix development shell will install Jekyll for building and serving the site and Java 25 (if you want a simple Java-based tool to serve/test the static site.)
+
+1. Run `nix develop`
+2. Run `jekyll build`
+
+This will build the site into the `_site` directory.
+
+## Serving the site locally
+
+To serve the site with Jekyll and dynamic reloading:
+
+* `jekyll serve --livereload --incremental`
+
+To run a simple, local Java-based webserver to view the site use:
+
+* `./scripts/JekyllServer.java`
+
+## Building locally without Nix
+
+If you install Jekyll 3.10.0 and Ruby 3.3, you should be able to use the same commands as shown above, but this is untested/unsupported. You should also be able to serve the generated static site with the Java 25 script.
+
+## Building as a Nix Package
+
+* `nix build .#`
+
+This should build the package in `result`.
+
 ## Contributing
 
 To report a documentation issue or make a suggestion for improvement use [GitHub Issues](). You can also submit a [pull-request](https://github.com/bitcoinj/bitcoinj.github.io/pulls) for the website.

flake.nix

@@ -0,0 +1,94 @@
+{
+  description = "Development environment for bitcoinj.github.io Jekyll site";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/release-25.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        # Ruby environment with Jekyll and bundler
+        rubyEnv = pkgs.ruby_3_3.withPackages (ps: with ps; [
+          jekyll
+          kramdown-parser-gfm
+        ]);
+
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            rubyEnv
+            jdk25_headless
+          ];
+
+          shellHook = ''
+            echo "=== bitcoinj.github.io development environment ==="
+            echo ""
+            echo "Available commands:"
+            echo "  jekyll build                - Build the site to _site/"
+            echo "  jekyll serve                - Serve the site locally at http://localhost:4000"
+            echo "  jekyll serve --livereload   - Serve with auto-reload on changes"
+            echo "  ./scripts/JekyllServer.java - Serve the static site with a Java script"
+            echo ""
+          '';
+        };
+
+        # Package that builds the site
+        packages.default = pkgs.stdenv.mkDerivation {
+          pname = "bitcoinj-site";
+          version = "0.0.1";
+
+          src = ./.;
+
+          buildInputs = [ rubyEnv ];
+
+          buildPhase = ''
+            export HOME=$TMPDIR
+            jekyll build
+          '';
+
+          installPhase = ''
+            mkdir -p $out
+            cp -r _site/* $out/
+          '';
+        };
+
+        # App for easy site building
+        apps.build = {
+          type = "app";
+          program = "${pkgs.writeShellScript "build-site" ''
+            set -e
+            export HOME=$TMPDIR
+            ${rubyEnv}/bin/jekyll build
+            echo "Site built to _site/"
+          ''}";
+        };
+
+        apps.serve = {
+          type = "app";
+          program = "${pkgs.writeShellScript "serve-site" ''
+            set -e
+            export HOME=$TMPDIR
+            ${rubyEnv}/bin/jekyll serve --livereload
+          ''}";
+        };
+
+        apps.tarball = {
+          type = "app";
+          program = "${pkgs.writeShellScript "create-tarball" ''
+            set -e
+            export HOME=$TMPDIR
+            echo "Building site..."
+            ${rubyEnv}/bin/jekyll build
+            echo "Creating tarball..."
+            ${pkgs.gnutar}/bin/tar -czf bitcoinj-site.tar.gz -C _site .
+            echo "Tarball created: bitcoinj-site.tar.gz"
+          ''}";
+        };
+      }
+    );
+}

scripts/JekyllServer.java

@@ -0,0 +1,77 @@
+///usr/bin/env java "$0" "$@" ; exit $?
+import com.sun.net.httpserver.HttpExchange;
+import com.sun.net.httpserver.HttpHandler;
+import com.sun.net.httpserver.HttpHandlers;
+import com.sun.net.httpserver.SimpleFileServer;
+import java.net.InetSocketAddress;
+import java.nio.file.Path;
+
+static final int port = 4000;
+
+public static void main(String[] args) {
+    Path root = Path.of("./_site").toAbsolutePath();
+
+    // Create the default file handler
+    var fileHandler = SimpleFileServer.createFileHandler(root);
+
+    // This handler checks if we need to append .html internally
+    HttpHandler rewritingHandler = exchange -> {
+        String path = exchange.getRequestURI().getPath();
+
+        // If path is not root, doesn't have a dot, and doesn't end in a slash
+        if (!path.equals("/") && !path.contains(".") && !path.endsWith("/")) {
+            String newPath = path + ".html";
+
+            // We wrap the exchange to override the Request URI
+            // The file handler will now look for "name.html" on disk
+            fileHandler.handle(new WrappedExchange(exchange, newPath));
+        } else {
+            fileHandler.handle(exchange);
+        }
+    };
+
+    // Start the server
+    var server = SimpleFileServer.createFileServer(
+            new InetSocketAddress(port),
+            root,
+            SimpleFileServer.OutputLevel.INFO
+    );
+
+    // Replace the default context with our custom handler
+    server.removeContext("/");
+    server.createContext("/", rewritingHandler);
+
+    System.out.printf("Serving Jekyll site at http://localhost:%s\n", port);
+    server.start();
+    IO.println("Use Control-C to cancel");
+}
+
+// Helper class to "trick" the file handler into looking for a different path
+static class WrappedExchange extends HttpExchange {
+    private final HttpExchange delegate;
+    private final URI interceptedUri;
+
+    WrappedExchange(HttpExchange delegate, String newPath) {
+        this.delegate = delegate;
+        this.interceptedUri = delegate.getRequestURI().resolve(newPath);
+    }
+
+    @Override public URI getRequestURI() { return interceptedUri; }
+    // Delegate all other methods
+    @Override public com.sun.net.httpserver.Headers getRequestHeaders() { return delegate.getRequestHeaders(); }
+    @Override public com.sun.net.httpserver.Headers getResponseHeaders() { return delegate.getResponseHeaders(); }
+    @Override public String getRequestMethod() { return delegate.getRequestMethod(); }
+    @Override public void sendResponseHeaders(int rCode, long responseLength) throws java.io.IOException { delegate.sendResponseHeaders(rCode, responseLength); }
+    @Override public java.io.InputStream getRequestBody() { return delegate.getRequestBody(); }
+    @Override public java.io.OutputStream getResponseBody() { return delegate.getResponseBody(); }
+    @Override public void close() { delegate.close(); }
+    @Override public InetSocketAddress getRemoteAddress() { return delegate.getRemoteAddress(); }
+    @Override public int getResponseCode() { return delegate.getResponseCode(); }
+    @Override public InetSocketAddress getLocalAddress() { return delegate.getLocalAddress(); }
+    @Override public String getProtocol() { return delegate.getProtocol(); }
+    @Override public Object getAttribute(String name) { return delegate.getAttribute(name); }
+    @Override public void setAttribute(String name, Object value) { delegate.setAttribute(name, value); }
+    @Override public void setStreams(java.io.InputStream i, java.io.OutputStream o) { delegate.setStreams(i, o); }
+    @Override public com.sun.net.httpserver.HttpContext getHttpContext() { return delegate.getHttpContext(); }
+    @Override public com.sun.net.httpserver.HttpPrincipal getPrincipal() { return delegate.getPrincipal(); }
+}