trader 7.13 (new formula)

Add Star Traders, a simple text-based game of interstellar trading,
where the objective is to create companies, buy and sell shares,
borrow and repay money, in order to become the wealthiest player
(the winner).

Uses the Homebrew version of ncurses as the system version does not
handle multibyte strings correctly (according to the output of the
./configure script).

Closes #46770.

Signed-off-by: Rui Chen <chenrui333@gmail.com>

Formula/trader.rb

@@ -0,0 +1,29 @@
+class Trader < Formula
+  desc "Star Traders"
+  homepage "https://www.zap.org.au/projects/trader/"
+  url "https://ftp.zap.org.au/pub/trader/unix/trader-7.13.tar.xz"
+  sha256 "0d2b51134166b0f436dc6423e2ce378b1df929a9de141c002f3da86af18bb262"
+
+  depends_on "pkg-config" => :build
+  depends_on "gettext"
+  depends_on "ncurses" # The system version does not work correctly
+
+  def install
+    ENV.prepend_path "PKG_CONFIG_PATH",
+        Formula["ncurses"].opt_libexec/"lib/pkgconfig"
+    args = %W[
+      --disable-dependency-tracking
+      --disable-silent-rules
+      --prefix=#{prefix}
+      --with-libintl-prefix=#{Formula["gettext"].opt_prefix}
+    ]
+    system "./configure", *args
+    system "make", "install"
+  end
+
+  test do
+    # Star Traders is an interactive game, so the only option for testing
+    # is to run something like "trader --version"
+    system "#{bin}/trader", "--version"
+  end
+end