src/timetable: Move argument checking in normalise to own function

diff --git a/src/timetable.lua b/src/timetable.lua
index 9af79942cdd47883ebc137b2e602a022aaa8f73a..81fcbf8acd6ff9e75ff5c3fad70732c916e9a80f 100644 (file)
--- a/src/timetable.lua
+++ b/src/timetable.lua
@@ -63,13 +63,17 @@ local function increment ( tens , units , base )
        return tens , units
 end
 
+local function unpack_tm ( tm )
+       return assert ( tm.year  , "year required" ) ,
+               assert ( tm.month , "month required" ) ,
+               assert ( tm.day   , "day required" ) ,
+               tm.hour or 12 ,
+               tm.min  or 0 ,
+               tm.sec  or 0
+end
+
 local function normalise ( tm )
-       local sec   = tm.sec  or 0
-       local min   = tm.min  or 0
-       local hour  = tm.hour or 12
-       local day   = assert ( tm.day   , "day required" )
-       local month = assert ( tm.month , "month required" )
-       local year  = assert ( tm.year  , "year required" )
+       local year , month , day , hour , min , sec = unpack_tm ( tm )
 
        min  , sec  = increment ( min  , sec  , 60 ) -- TODO: consider leap seconds?
        hour , min  = increment ( hour , min  , 60 )