First cut at a --run option for sixtypical, replacing loadngo.sh.

bin/sixtypical

@@ -11,7 +11,9 @@ from argparse import ArgumentParser
 import codecs
 import json
 from pprint import pprint
+from subprocess import check_call
 import sys
+from tempfile import NamedTemporaryFile
 import traceback
 
 from sixtypical.parser import Parser, SymbolTable, merge_programs
@@ -64,7 +66,7 @@ def process_input_files(filenames, options):
         compilation_roster = fa.serialize()
         dump(compilation_roster)
 
-    if options.analyze_only or options.output is None:
+    if options.analyze_only or (options.output is None and not options.run):
         return
 
     start_addr = None
@@ -74,7 +76,13 @@ def process_input_files(filenames, options):
         else:
             start_addr = int(options.origin, 10)
 
-    with open(options.output, 'wb') as fh:
+    if options.run:
+        fh = NamedTemporaryFile(delete=False)
+        output_filename = fh.name
+    else:
+        fh = open(options.output, 'wb')
+        output_filename = options.output
+
     outputter = outputter_class_for(options.output_format)(fh, start_addr=start_addr)
     outputter.write_prelude()
     compiler = Compiler(symtab, outputter.emitter)
@@ -85,6 +93,20 @@ def process_input_files(filenames, options):
     else:
         outputter.emitter.serialize_to(fh)
 
+    fh.close()
+
+    if options.run:
+        emu = {
+            'c64-basic-prg': "x64 -config vicerc",
+            'vic20-basic-prg': "xvic -config vicerc",
+            'atari2600-cart': "stella"
+        }.get(options.output_format)
+        if not emu:
+            raise ValueError("No emulator configured for selected --output-format '{}'".format(options.output_format))
+
+        command = "{} {}".format(emu, output_filename)
+        check_call(command, shell=True)
+
 
 if __name__ == '__main__':
     argparser = ArgumentParser()
@@ -142,6 +164,12 @@ if __name__ == '__main__':
         action="store_true",
         help="Display debugging information when analyzing and compiling."
     )
+    argparser.add_argument(
+        "--run",
+        action="store_true",
+        help="Engage 'load-and-go' operation: write the output to a temporary filename, "
+             "infer an emulator from the given --output-format, and boot the emulator."
+    )
     argparser.add_argument(
         "--traceback",
         action="store_true",