restore command.rb

Author: monkstone

lib/jruby_art/command.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+require_relative '../jruby_art/jruby_complete'
+require_relative '../jruby_art/java_opts'
+module Processing
+  # The command class check for configuration and options, before creating and
+  # executing the jruby (or java) command to run the sketch
+  class Command
+    attr_reader :runner, :args, :filename
+    def initialize(runner:, args:, filename:)
+      @runner = runner
+      @args = args
+      @filename = filename
+    end
+
+    # Trade in this Ruby instance for a JRuby instance, loading in a starter
+    # script and passing it some arguments. Unless you set JRUBY: false in
+    # ~/.jruby_art/config.yml, an installed version of jruby is used instead
+    # of our vendored one. Note the use of jruby-complete might make using
+    # other gems in your sketches hard (but not impossible)....
+    def cmd(root)
+      cmda = jruby_command(Processing::RP_CONFIG.fetch('JRUBY', true), root)
+      begin
+        puts *cmda
+        exec(*cmda)
+        # exec replaces the Ruby process with the JRuby one.
+      rescue Java::JavaLang::ClassNotFoundException
+      end
+    end
+
+    private
+
+    # avoiding multiline ternary etc
+    def jruby_command(installed, root)
+      return ['jruby', JRubyOpts.new(root).opts, runner, filename, args].flatten if installed
+      opts = JavaOpts.new(root).opts
+      complete = JRubyComplete.complete
+      ['java', opts, '-cp', complete, 'org.jruby.Main', runner, filename, args].flatten
+    end
+  end
+end