create BaseDoctype with features needed by all

each document processor will need to know about its
sources, outputs and the platform details
the generate() method is a temporary model for operation

tldp/doctypes/common.py

@@ -2,6 +2,7 @@
 
 from __future__ import absolute_import, division, print_function
 
+import os
 from ..utils import logger
 
 
@@ -22,5 +23,27 @@ class SignatureChecker(object):
                              sig, f.name, cls.__name__)
         return None
 
+
+class BaseDoctype(object):
+
+    def __init__(self, *args, **kwargs):
+        self.source = kwargs.get('source')
+        self.output = kwargs.get('output')
+        self.platform = kwargs.get('platform')
+        self.logdir = os.path.join(self.output.dirname, 'logs')
+        if os.path.exists(self.logdir):
+            logger.warning("Found existing logs directory: %s", self.logdir)
+        else:
+            os.mkdir(self.logdir)
+
+    def generate(self):
+        os.chdir(self.output.dirname)
+        self.output.clear()
+        self.platform_check()
+        self.create_htmls()
+        self.create_pdf()
+        self.create_txt()
+        self.create_html()
+
 #
 # -- end of file