print gaps info when click

closes #241 (closed)

sohstationviewer/controller/util.py

@@ -422,3 +422,43 @@ def get_valid_file_count(list_of_dir: Path) -> int:
             total += len([f for f in files
                          if validate_file(Path(path).joinpath(f), f)])
     return total
+
+
+def _format_time_item(
+        unit: str, value: Union[int, float], time_list: List[str]):
+    """
+    Append the format string of time item to time_list if not zero
+
+    :param unit: a time unit (day/hour/minute/second)
+    :param value: value of the time item
+    :param time_list: list of different formatted time item
+    """
+    if value == 0:
+        return
+    else:
+        formatted = f"{value} {unit}"
+        if value > 1:
+            formatted += 's'
+    time_list.append(formatted)
+
+
+def get_formatted_time_delta(time_delta: float) -> str:
+    """
+    Convert time_delta in seconds into formatted string of
+    (days, hours, minutes, seconds)
+    :param time_delta: length of time delta in seconds
+    :return formatted string of time delta
+    """
+    time_list = []
+    days = int(time_delta // 86400)
+    _format_time_item('day', days, time_list)
+    hours = int((time_delta - days * 86400) // 3600)
+    _format_time_item('hour', hours, time_list)
+    minutes = int((time_delta - days * 86400 - hours * 3600) // 60)
+    _format_time_item('minute', minutes, time_list)
+    seconds = time_delta - days * 86400 - hours * 3600 - minutes * 60
+    _format_time_item('second', seconds, time_list)
+    if not time_list:
+        return "0.0 seconds"
+    else:
+        return " ".join(time_list)