pastel 0.5.3 (new formula)

Add the pastel command-line utility, for working with colors

Closes #43459.

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

Formula/pastel.rb

@@ -0,0 +1,24 @@
+class Pastel < Formula
+  desc "Command-line tool to generate, analyze, convert and manipulate colors"
+  homepage "https://github.com/sharkdp/pastel"
+  url "https://github.com/sharkdp/pastel/archive/v0.5.3.tar.gz"
+  sha256 "0850e37b92b8d2f5a396d5b9114a21a64dce5c6cce736039151c800f35abaa1e"
+
+  depends_on "rust" => :build
+
+  def install
+    ENV["SHELL_COMPLETIONS_DIR"] = buildpath/"completions"
+
+    system "cargo", "install", "--root", prefix, "--path", "."
+
+    bash_completion.install "completions/pastel.bash"
+    zsh_completion.install "completions/_pastel"
+    fish_completion.install "completions/pastel.fish"
+  end
+
+  test do
+    output = shell_output("#{bin}/pastel format hex rebeccapurple").strip
+
+    assert_equal "#663399", output
+  end
+end