[resotolib][feat] Add optional duration parsing (#1575)

Author: lloesche

resotocore/resotocore/infra_apps/local_runtime.py

@@ -10,7 +10,7 @@
 from aiostream.core import Stream
 from aiostream import stream
 from argparse import Namespace
-from resotolib.durations import parse_duration
+from resotolib.durations import parse_optional_duration
 from resotolib.asynchronous.utils import async_lines
 
 
@@ -72,7 +72,7 @@ async def perform_search(search: str) -> AsyncIterator[Json]:
                 async for result in ctx:
                     yield result
 
-        template.globals["parse_duration"] = parse_duration
+        template.globals["parse_duration"] = parse_optional_duration
         template.globals["search"] = perform_search
 
         async for line in async_lines(template.generate_async(config=config, args=kwargs, stdin=stdin)):

resotolib/resotolib/durations.py

@@ -56,6 +56,13 @@ def parse_duration(ds: str) -> timedelta:
     return timedelta(seconds=duration_parser.parse(ds))
 
 
+def parse_optional_duration(ds: str) -> Optional[timedelta]:
+    try:
+        return parse_duration(ds)
+    except Exception:
+        return None
+
+
 def duration_str(duration: timedelta, precision: Optional[int] = 0, down_to_unit: Optional[str] = None) -> str:
     """
     Convert a timedelta to a string representing the duration human-readable short unit syntax.