Fix duplicate _freq_ elements in default output file names (closes #214)

climix/main.py

@@ -100,7 +100,13 @@ def guess_output_template(datafiles):
         base = unique_bases.pop()
         start = min(starts)
         end = max(ends)
-        output_template = f'{{var_name}}_{base}_{{frequency}}_{start}-{end}.nc'
+        if '_day_' in base:
+            base = base.replace('_day_', '_{frequency}_')
+        elif base.endswith('_day'):
+            base = base.replace('_day', '_{frequency}')
+        else:
+            base += '_{frequency}'
+        output_template = f'{{var_name}}_{base}_{start}-{end}.nc'
     return output_template