Implement silent autoconfig mode (#239)

* Allow for silent mode

`-s` or `--silent`

* Parse arguments in main

* Make it work right

* Shut racket up

* Stop using drugs

* Some fixes

dmoj/executors/autoconfig.py

@@ -4,12 +4,19 @@
 import yaml
 import yaml.representer
 
+import argparse
+
 from dmoj import judgeenv
 from dmoj.executors import get_available, load_executor
+from dmoj.executors.mixins import NullStdoutMixin
 from dmoj.utils.ansi import ansi_style
 
 
 def main():
+    parser = argparse.ArgumentParser(description='Automatically configures runtimes')
+    parser.add_argument('-s', '--silent', action='store_true', help='silent mode')
+    silent = parser.parse_args().silent
+
     result = {}
 
     if os.name == 'nt':
@@ -29,35 +36,46 @@ def main():
         if executor is None or not hasattr(executor, 'Executor'):
             continue
 
-        if hasattr(executor.Executor, 'autoconfig'):
-            print ansi_style('%-43s%s' % ('Auto-configuring #ansi[%s](|underline):' % name, '')),
+        Executor = executor.Executor
+        if silent and not issubclass(Executor, NullStdoutMixin):
+            # if you are printing errors into stdout, you may do so in your own blood
+            # *cough* Racket *cough*
+            Executor = type('Executor', (NullStdoutMixin, Executor), {})
+
+        if hasattr(Executor, 'autoconfig'):
+            if not silent:
+                print ansi_style('%-43s%s' % ('Auto-configuring #ansi[%s](|underline):' % name, '')),
             try:
-                data = executor.Executor.autoconfig()
+                data = Executor.autoconfig()
                 config = data[0]
                 success = data[1]
                 feedback = data[2]
                 errors = '' if len(data) < 4 else data[3]
             except Exception:
-                print ansi_style('#ansi[Not supported](red|bold)')
-                traceback.print_exc()
+                if not silent:
+                    print ansi_style('#ansi[Not supported](red|bold)')
+                    traceback.print_exc()
             else:
-                print ansi_style(['#ansi[%s](red|bold)', '#ansi[%s](green|bold)'][success] %
+                if not silent:
+                    print ansi_style(['#ansi[%s](red|bold)', '#ansi[%s](green|bold)'][success] %
                                  (feedback or ['Failed', 'Success'][success]))
 
                 if not success:
-                    if config:
-                        print '  Attempted:'
-                        print '   ', yaml.dump(config, default_flow_style=False).rstrip().replace('\n', '\n' + ' ' * 4)
+                    if not silent:
+                        if config:
+                            print '  Attempted:'
+                            print '   ', yaml.dump(config, default_flow_style=False).rstrip().replace('\n', '\n' + ' ' * 4)
 
-                    if errors:
-                        print '  Errors:'
-                        print '   ', errors.replace('\n', '\n' + ' ' * 4)
+                        if errors:
+                            print '  Errors:'
+                            print '   ', errors.replace('\n', '\n' + ' ' * 4)
 
                 if success:
                     result.update(config)
 
-    print
-    print ansi_style('#ansi[Configuration result](green|bold|underline):')
+    if not silent:
+        print
+        print ansi_style('#ansi[Configuration result](green|bold|underline):')
     print yaml.dump({'runtime': result}, default_flow_style=False).rstrip()
 
 if __name__ == '__main__':