rustup-init 1.3.0 (new formula)

Closes #14236.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Aliases/rustup

@@ -0,0 +1 @@
+../Formula/rustup-init.rb

Formula/rustup-init.rb

@@ -0,0 +1,33 @@
+class RustupInit < Formula
+  desc "The Rust toolchain installer"
+  homepage "https://github.com/rust-lang-nursery/rustup.rs"
+
+  url "https://github.com/rust-lang-nursery/rustup.rs/archive/1.3.0.tar.gz"
+  sha256 "c0ca06b70104fed8f1de5a6f5ecfd8478e8bc03f15add8d7896b86b3b15e81e3"
+
+  depends_on "rust" => :build
+
+  def install
+    cargo_home = buildpath/"cargo_home"
+    cargo_home.mkpath
+    ENV["CARGO_HOME"] = cargo_home
+
+    system "cargo", "build", "--release", "--verbose"
+
+    bin.install buildpath/"target/release/rustup-init"
+  end
+
+  test do
+    ENV["CARGO_HOME"] = testpath/".cargo"
+    ENV["RUSTUP_HOME"] = testpath/".multirust"
+
+    system bin/"rustup-init", "-y"
+    (testpath/"hello.rs").write <<-EOS.undent
+      fn main() {
+        println!("Hello World!");
+      }
+    EOS
+    system testpath/".cargo/bin/rustc", "hello.rs"
+    assert_equal "Hello World!", shell_output("./hello").chomp
+  end
+end