Towards #6: check function

pymule/duplicaterun.py

 from PathType import PathType
+import os
+
+
+def yn_choice(message, default='y'):
+    choices = 'Y/n' if default.lower() in ('y', 'yes') else 'y/N'
+    choice = raw_input("%s (%s) " % (message, choices))
+    values = ('y', 'yes', '') if choices == 'Y/n' else ('y', 'yes')
+    return choice.strip().lower() in values
 
 
 def create_parser(subparsers):
@@ -21,4 +29,18 @@ def create_parser(subparsers):
 
 
 def main(parsed):
-    print parsed
+    def check(msg, opt=False):
+        if parsed.dry:
+            print msg
+            return False
+        if parsed.i:
+            ans = yn_choice(msg)
+            if ans:
+                return True
+            else:
+                if opt:
+                    return False
+                else:
+                    raise IOError("Aborting. This was not negotiable")
+        else:
+            return True