Add crystal package (#7512)

Co-authored-by: chronos <no-reply@github.com>

packages/crystal.rb

@@ -0,0 +1,29 @@
+require 'package'
+
+class Crystal < Package
+  description 'A language for humans and computers'
+  homepage 'https://crystal-lang.org/'
+  version '1.6.0'
+  license 'Apache-2.0'
+  compatibility 'x86_64'
+  source_url 'https://github.com/crystal-lang/crystal/releases/download/1.6.0/crystal-1.6.0-1-linux-x86_64-bundled.tar.gz'
+  source_sha256 '5b1b287563839c3c9a2fa7b620c48b5c56de0756464e8370f3a7f720a3ba4df0'
+
+  depends_on 'llvm' # R
+
+  def self.install
+    FileUtils.mkdir_p CREW_DEST_PREFIX.to_s
+    FileUtils.mv %w[bin lib share], CREW_DEST_PREFIX.to_s
+    bashcomp = <<~EOF
+      # Crystal bash completion
+      source "#{CREW_PREFIX}/share/bash-completion/completions/crystal"
+    EOF
+    FileUtils.mkdir_p "#{CREW_DEST_PREFIX}/etc/bash.d"
+    File.write("#{CREW_DEST_PREFIX}/etc/bash.d/10-crystal", bashcomp)
+  end
+
+  def self.postinstall
+    puts "\nTo finish the installation, execute the following:".lightblue
+    puts "source ~/.bashrc\n".lightblue
+  end
+end