extra paths appended to front of existing path

hissw/environment.py

@@ -26,7 +26,9 @@ class Environment(object):
     ssw_paths : list, optional
         List of SSW paths to pass to `ssw_path`
     extra_paths : list, optional
-        Additional paths to add to the IDL namespace
+        Additional paths to add to the IDL namespace. Note that these
+        are appended to the front of the path such that they take
+        precedence over the existing path.
     ssw_home : str, optional
         Root of SSW tree
     idl_home : str, optional
@@ -106,6 +108,8 @@ def run(self, script, args=None, save_vars=None, verbose=True):
         save_vars : list, optional
             Variables to save and return from the IDL namespace
         verbose : bool, optional
+            If True, print STDERR and SDOUT. Otherwise it will be
+            suppressed. This is useful for debugging.
         """
         args = {} if args is None else args
         with tempfile.TemporaryDirectory() as tmpdir:

hissw/templates/parent.pro

@@ -3,7 +3,7 @@
 ssw_path,/{{ ssw_paths | join(', /') }}
 {% endif %}
 ;add any other paths we need to the IDL path
-!PATH=!PATH{%for p in extra_paths%}+':'+EXPAND_PATH('{{ p }}'){%endfor%}
+!PATH={%for p in extra_paths%}EXPAND_PATH('{{ p }}')+':'+{%endfor%}!PATH
 ;run user scripts
 .run {{ procedure_filename }}
 hissw_procedure