added execute command and options

execute to compile and run
options to pass parfait factory levels in (as no gc)

lib/rubyx/rubyxc.rb

@@ -3,10 +3,12 @@ require "rubyx"
 require "risc/interpreter"
 
 class RubyXC < Thor
+  class_option :parfait , type: :numeric
+
+
   desc "compile FILE" , "Compile given FILE to binary"
   long_desc <<-LONGDESC
-      Very basic cli to compile ruby programs.
+      Compile the give file name to binary object file (see long descr.)
-      Currently only compile command supported without option.
 
       Output will be elf object file of the same name, with .o, in root directory.
 
@@ -23,13 +25,16 @@ class RubyXC < Thor
     end
     puts "compiling #{file}"
 
-    linker = ::RubyX::RubyXCompiler.new({}).ruby_to_binary( ruby , :arm )
+    linker = ::RubyX::RubyXCompiler.new(extract_options).ruby_to_binary( ruby , :arm )
     writer = Elf::ObjectWriter.new(linker)
 
     outfile = file.split("/").last.gsub(".rb" , ".o")
     writer.save outfile
+
+    return outfile
   end
 
+
   desc "interpret FILE" , "Interpret given FILE "
   long_desc <<-LONGDESC
   Compiles the given file to an intermediate RISC format, and runs the
@@ -54,11 +59,7 @@ class RubyXC < Thor
     rescue
       fail MalformattedArgumentError , "No such file #{file}"
     end
-    options = {
+    compiler = RubyX::RubyXCompiler.new(extract_options)
-       parfait:  { factory: 3*1024, },
-       load_parfait: false ,
-     }
-    compiler = RubyX::RubyXCompiler.new(options)
     linker = compiler.ruby_to_binary(ruby, :interpreter)
 
     puts "interpreting #{file}"
@@ -68,4 +69,38 @@ class RubyXC < Thor
     interpreter.tick while(interpreter.instruction)
 
   end
+
+  desc "execute FILE" , "Compile given FILE and execute resulting binary"
+  long_desc <<-LONGDESC
+    Just like the compile task, this compiles the file to an object/binary file.
+
+    Then rubyxc will link and run the resulting object file. For this to work,
+    qemu needs to be set up correctly on the system. Specifically, because of
+    bug #13, arm-linux-gnueabihf-ld needs to exist (it's part of the cross compiled
+    arm binutils).
+
+    The resulting a.out will be run via qemu-arm. This is part of the qemu "linux" package
+    and interprets the arm binary on the host, assuming a linux os.
+
+    This whole approach should only be used for preliminary checking that no core-dumps
+    are generated by the program, or when no benchmarking (as the times will be whatever).
+
+    For simple functional test though, it is a much much quicker way to run the binary
+    than transferring it to another machine. The a.out is left in place to be run again.
+  LONGDESC
+
+  def execute(file)
+    outfile = compile(file)
+    system "arm-linux-gnueabihf-ld -N #{outfile}"
+    puts "Linked ok, now running #{file}"
+    system "qemu-arm ./a.out"
+  end
+
+  private
+  def extract_options
+    opt = { factory: options[:parfait] || 1024 }
+    puts opt
+    return {parfait: opt}
+  end
+
 end