Merge pull request #237 from tomerfiliba/cli_run

Cli direct run

docs/cli.rst

@@ -48,6 +48,9 @@ And you can run it::
 
 So far you've only seen the very basic usage. We'll now start to explore the library.
 
+.. versionadded:: 1.6.1
+
+    You can also directly run the app, as ``MyApp()``, without arguments, instead of calling ``.main()``.
 
 Application
 -----------

examples/simple_cli.py

@@ -55,5 +55,5 @@ def main(self, *srcfiles):
 
 
 if __name__ == "__main__":
-    MyCompiler.run()
+    MyCompiler()
 

plumbum/cli/application.py

@@ -120,6 +120,18 @@ def main(self, src, dst):
     nested_command = None
     _unbound_switches = ()
 
+    def __new__(cls, executable=None):
+        """Allows running the class directly as a shortcut for main.
+        This is neccisary for some setup scripts that want a single function,
+        instead of an expression with a dot in it."""
+
+
+        if executable is None:
+            return cls.run()
+            # This return value was not a class instance, so __init__ is never called
+        else:
+            return super(Application, cls).__new__(cls)
+
     def __init__(self, executable):
         # Filter colors
 
@@ -166,6 +178,7 @@ def __init__(self, executable):
                     if swinfo.envname:
                         self._switches_by_envar[swinfo.envname] = swinfo
 
+
     @property
     def root_app(self):
         return self.parent.root_app if self.parent else self