Config: add function to convert ISO periods to seconds (period2sec)

CHANGES.rst

@@ -6,6 +6,14 @@ Make Experiments!
 Release Changes
 ---------------
 
+Release 1.4.2
+=============
+
+Config
+------
+
+* Add function to convert ISO periods to seconds (period2sec)
+
 Release 1.4.1
 =============
 

expconfig.py

@@ -283,6 +283,23 @@ class ExpConfig(ConfigObj):
             h, m = divmod(minutes, 60)
             return "{0:02}:{1:02}:{2:02}".format(h, m, s)
 
+        def period2sec(stamp):
+            # Do not support years and months for now
+            match = re.fullmatch(
+                r"P(?:(?P<days>\d+)D)?"
+                r"(?:T(?:(?P<hours>\d+)H)?"
+                r"(?:(?P<minutes>\d+)M)?"
+                r"(?:(?P<seconds>\d+)S)?)?",
+                stamp
+            )
+            if match:
+                values = match.groupdict(0)
+                return str(
+                    (( int(values['days'])*24 + int(values['hours']) )*60
+                     + int(values['minutes']) )*60 + int(values['seconds'])
+                )
+            raise ValueError(f"unsupported period '{stamp}'")
+
         def split_date(value):
             '''Re-format datetime string to list for use in namelists'''
             match = re.match(r'^0*(\d+)-0*(\d+)-0*(\d+)'
@@ -392,6 +409,10 @@ class ExpConfig(ConfigObj):
             if match:
                 return sec2time(match.group(1))
 
+            match = re.match(r'^period2sec\((.*)\)$', value, re.S)
+            if match:
+                return period2sec(match.group(1))
+
             match = re.match(r'^read\((.*)\)$', value, re.S)
             if match:
                 return read_value(match.group(1))

test.py

@@ -456,6 +456,15 @@ class ContentTestCase(MkexpSimpleTestCase):
             FALSE = eval(is_set('F'))
         """)
 
+    def test_period2sec(self):
+        self.run_test(u"""
+            %{VALUE}
+        """, u"""
+            93784
+        """, u"""
+            VALUE = period2sec(P1DT2H3M4S)
+        """)
+
     def test_initial_comment_boilerplate(self):
         writeconfig(self.exp_id, u"""
             ######