src/timetable: Add timestamp method

[etc/awesome.git] / src / timetable.lua

diff --git a/src/timetable.lua b/src/timetable.lua
index df78b1570446f4de25aaf0e1d715a4fdeca95418..5fa720542d33945defe25b6a50ee2e33384bbde5 100644 (file)
--- a/src/timetable.lua
+++ b/src/timetable.lua
@@ -72,9 +72,8 @@ local function unpack_tm ( tm )
                tm.sec  or 0
 end
 
-local function normalise ( tm )
-       local year , month , day , hour , min , sec = unpack_tm ( tm )
-
+-- Modify parameters so they all fit within the "normal" range
+local function normalise ( year , month , day , hour , min , sec )
        min  , sec  = increment ( min  , sec  , 60 ) -- TODO: consider leap seconds?
        hour , min  = increment ( hour , min  , 60 )
        day  , hour = increment ( day  , hour , 24 )
@@ -96,22 +95,47 @@ local function normalise ( tm )
        year , month = increment ( year , month - 1 , 12 )
        month = month + 1
 
-       tm.sec   = sec
-       tm.min   = min
-       tm.hour  = hour
-       tm.day   = day
-       tm.month = month
-       tm.year  = year
+       return year , month , day , hour , min , sec
+end
+
+local function timestamp ( year , month , day , hour , min , sec )
+       return 60*60*24*(
+                       year * year_length ( year )
+                       + month * month_length ( month , year )
+                       + day
+               )
+               + hour  * (60*60)
+               + min   * 60
+               + sec
+end
+
+
+local timetable_methods = { }
+
+function timetable_methods:normalise ( )
+       local year , month , day
+       year , month , day , self.hour , self.min , self.sec = normalise ( unpack_tm ( self ) )
+
+       self.day   = day
+       self.month = month
+       self.year  = year
 
        local yday = day_of_year ( day , month , year )
        local wday = day_of_week ( yday , year )
 
-       tm.yday = yday
-       tm.wday = wday
+       self.yday = yday
+       self.wday = wday
 
-       return tm
+       return self
 end
+timetable_methods.normalize = timetable_methods.normalise -- American English
+
+function timetable_methods:timestamp ( )
+       return timestamp ( unpack_tm ( self ) )
+end
+
 local timetable_mt = {
+       __index    = timetable_methods ;
 }
 
 local function cast_timetable ( tm )
@@ -132,6 +156,7 @@ end
 return {
        doomsday  = doomsday ;
        normalise = normalise ;
+       timestamp = timestamp ;
 
        new = new_timetable ;
        cast = cast_timetable ;