mdbook 0.2.3 (new formula)

Closes #37444.

Signed-off-by: FX Coudert <fxcoudert@gmail.com>

Formula/mdbook.rb

@@ -0,0 +1,17 @@
+class Mdbook < Formula
+  desc "Create modern online books from Markdown files"
+  homepage "https://rust-lang-nursery.github.io/mdBook"
+  url "https://github.com/rust-lang-nursery/mdBook/archive/v0.2.3.tar.gz"
+  sha256 "2e157d4f0437143caf65d9253f9084d8cc0fff7a9e42cff3641e8413e15688fa"
+  depends_on "rust" => :build
+
+  def install
+    system "cargo", "install", "--root", prefix, "--path", "."
+  end
+
+  test do
+    # simulate user input to mdbook init
+    system "sh", "-c", "printf \\n\\n | #{bin}/mdbook init"
+    system "#{bin}/mdbook", "build"
+  end
+end