Moved the value check functions to a common.py file

nw/common.py

@@ -0,0 +1,52 @@
+# -*- coding: utf-8 -*-
+"""novelWriter Common Functions
+
+ novelWriter – Common Functions
+================================
+ Various functions used multiple places
+
+ File History:
+ Created: 2019-05-12 [0.1.0]
+
+"""
+
+import logging
+import nw
+
+logger = logging.getLogger(__name__)
+
+def checkString(checkValue, defaultValue, allowNone=False):
+    if allowNone:
+        if checkValue == None:   return None
+        if checkValue == "None": return None
+    if isinstance(checkValue,str): return str(checkValue)
+    return defaultValue
+
+def checkInt(checkValue, defaultValue, allowNone=False):
+    if allowNone:
+        if checkValue == None:   return None
+        if checkValue == "None": return None
+    try:
+        return int(checkValue)
+    except:
+        return defaultValue
+
+def checkBool(checkValue, defaultValue, allowNone=False):
+    if allowNone:
+        if checkValue == None:   return None
+        if checkValue == "None": return None
+    if isinstance(checkValue, str):
+        if checkValue == "True":
+            return True
+        elif checkValue == "False":
+            return False
+        else:
+            return defaultValue
+    elif isinstance(checkValue, int):
+        if checkValue == 1:
+            return True
+        elif checkValue == 0:
+            return False
+        else:
+            return defaultValue
+    return defaultValue