further splitting out of logic, fixed regression

Pipfile

@@ -10,6 +10,7 @@ twine = "*"
 pytest = "*"
 python-dateutil = "*"
 click = "*"
+markdown-timesheet = {editable = true,path = "."}
 
 [requires]
 python_version = "3.7"

app/add.py

@@ -19,20 +19,26 @@ def add_up_timesheet(timesheet_string: str) -> Minutes:
     total_minutes = 0
 
     for line in timesheet_string.split("\n"):
-        total_minutes += get_minutes(line)
+        total_minutes += get_minutes_from_line(line)
     return total_minutes
 
 
-def get_minutes(time_sheet_string_line):
+def get_minutes_from_line(time_sheet_string_line):
     time_range_strings = find_time_ranges(time_sheet_string_line)
 
     if not time_range_strings:
         return 0
 
-    for time_range_string in time_range_strings:
-        start_string, end_string = split_time_range_string(time_range_string)
-        start, end = map(parse_time, [start_string, end_string])
-        return subtract_times(start, end)
+    return sum(
+        get_minutes_from_time_range_string(time_range_string)
+        for time_range_string in time_range_strings
+    )
+
+
+def get_minutes_from_time_range_string(time_range_string):
+    start_string, end_string = split_time_range_string(time_range_string)
+    start, end = map(parse_time, [start_string, end_string])
+    return subtract_times(start, end)
 
 
 def find_time_ranges(timesheet_line: str) -> Union[list, List[str]]: