Add leiningen package (#3283)

Add postinstall section

Add uninstall note to the postinstall section

Add leiningen to the exclusions list in needs_binaries.sh

packages/leiningen.rb

+require 'package'
+
+class Leiningen < Package
+  description 'for automating Clojure projects without setting your hair on fire'
+  homepage 'https://leiningen.org/'
+  version '2.9.1'
+  source_url 'https://github.com/technomancy/leiningen/archive/2.9.1.tar.gz'
+  source_sha256 'a4c239b407576f94e2fef5bfa107f0d3f97d0b19c253b08860d9609df4ab8b29'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'clojure'
+
+  def self.install
+    system "install -Dm755 bin/lein #{CREW_DEST_PREFIX}/bin/lein"
+  end
+
+  def self.postinstall
+    puts
+    puts "To start using leiningen, type 'lein'.".lightblue
+    puts
+    puts "To uninstall leiningen, execute the following:".lightblue
+    puts "crew remove leiningen".lightblue
+    puts "rm -rf ~/.lein".lightblue
+    puts
+  end
+end

tools/needs_binaries.sh

@@ -12,6 +12,7 @@ exclusions+=' qt.rb sl.rb spark.rb stack.rb sublime_merge.rb sublime_text.rb the
 exclusions+=' neofetch.rb perl_gcstring_linebreak.rb perl_io_socket_ssl.rb perl_locale_gettext.rb perl_locale_messages.rb perl_module_build.rb'
 exclusions+=' perl_read_key.rb perl_sgmls.rb perl_term_ansicolor.rb perl_text_charwidth.rb perl_text_unidecode.rb perl_text_wrapi18n.rb'
 exclusions+=' perl_time_hires.rb perl_unicode_eastasianwidth.rb perl_xml_parser.rb perl_xml_sax_parserfactory.rb perl_xml_simple.rb'
+exclusions+=' leiningen.rb v2ray.rb'
 if [[ "${arch}" == 'aarch64' || "${arch}" == 'armv7l' ]]; then
   exclusions+=' az.rb cf.rb clisp.rb dropbox.rb freebasic.rb miniconda3.rb misctools.rb oci.rb wkhtmltox.rb xorg_intel_driver.rb xorg_vmmouse_driver.rb'
 fi