Create replace_tmpl filter for Jinja2

src/wxflow/jinja.py

@@ -6,6 +6,7 @@
 import jinja2
 from markupsafe import Markup
 
+from .template import replace_tmpl
 from .timetools import (add_to_datetime, strftime, to_fv3time, to_isotime,
                         to_julian, to_timedelta, to_YMD, to_YMDH)
 
@@ -146,6 +147,7 @@ def get_set_env(self, loader: jinja2.BaseLoader, filters: Dict[str, callable] =
                 if not (isinstance(dt, SilentUndefined) or isinstance(delta, SilentUndefined))
                 else dt if isinstance(dt, SilentUndefined) else delta)
         env.filters["to_timedelta"] = lambda delta_str: to_timedelta(delta_str) if not isinstance(delta_str, SilentUndefined) else delta_str
+        env.filters["replace_tmpl"] = lambda string, tmpl_dict: replace_tmpl(string, tmpl_dict)
 
         # Add any additional filters
         if filters is not None:

src/wxflow/task.py

@@ -41,7 +41,7 @@
         # Create task_config with everything that is inside _config and whatever the user chooses to
         # extend it with when initializing a child subclass of Task. Only task_config should be referenced
         # in any application, not _config.
-        self.task_config = self._config.copy()
+        self.task_config = self._config.deepcopy()
 
         # Any other composite runtime variables that may be needed for the duration of the task
         # can be constructed here

src/wxflow/template.py

@@ -189,3 +189,13 @@
         return True
     else:
         return False
+
+
+def replace_tmpl(string, tmpl_dict):
+    """
+        Replace substrings of input string using  input dictionary.
+    """
+
+    for key in tmpl_dict:
+        string = string.replace(key, tmpl_dict[key])
+    return string