[MRG + 1] Add __main__ (#159)

* Renames camelot.cli to camelot.__main__

Closes #154

* Keep __main__ and cli separate

* Monkey patch click HelpFormatter

camelot/__init__.py

@@ -2,10 +2,20 @@
 
 import logging
 
+from click import HelpFormatter
+
 from .__version__ import __version__
 from .io import read_pdf
 
 
+def _write_usage(self, prog, args='', prefix='Usage: '):
+    return self._write_usage('camelot', args, prefix=prefix)
+
+
+# monkey patch click.HelpFormatter
+HelpFormatter._write_usage = HelpFormatter.write_usage
+HelpFormatter.write_usage = _write_usage
+
 # set up logging
 logger = logging.getLogger('camelot')
 

camelot/__main__.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import absolute_import
+
+
+__all__ = ('main',)
+
+
+def main():
+    from camelot.cli import cli
+
+    cli()
+
+
+if __name__ == "__main__":
+    main()